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Drag Racing Discussions => Front Engine Dragsters => Topic started by: codysisson on April 09, 2015, 04:21:34 PM

Title: Rear Tire selection
Post by: codysisson on April 09, 2015, 04:21:34 PM
I am running a 180", 1300#, 360CI small block on alcohol. Rear gear is 4.57, Glide, Engine dynos @ 540HP. I want to run a 31" Good Year tire but all I can find is a 12" wide tire. Right now i am running  a 10.5 wide tire.

I have to buy a set of rims so I have a spare set of tires but I wanted to find out from you folks if you thought a 12" was too much meat.

Any thoughts would be greatly appreciated.
Title: Re: Rear Tire selection
Post by: Oldschool on April 09, 2015, 05:13:01 PM
I am running 13x31x15 D5 Goodyear Eagle with a 700 hp motor. I would say 12" is not to much.
Very nice car
Title: Re: Rear Tire selection
Post by: slingshot383 on April 10, 2015, 07:06:30 AM
The 10.5's are a nice tire, there isn't a need to overtire a fed.
Title: Re: Rear Tire selection
Post by: LZ on April 10, 2015, 08:31:12 AM
Cody:
Beautiful car, nice 8). The lighting effect with the shop makes for a great shot.
What events are you planning to hit?
thanks and good luck
Luke
Title: Re: Rear Tire selection
Post by: George on April 10, 2015, 12:35:25 PM
On our car with the 355 injected engine the Goodyear 2585 was the best tire I ran. A 12" tire on a 12" wheel.
Title: Re: Rear Tire selection
Post by: Paul New on April 10, 2015, 06:45:34 PM
When we rand mid to low 8's in one of our old FEDs we used a 31x11 doesn't look like a tire size offered by Goodyear any longer
Title: Re: Rear Tire selection
Post by: Pipe Dreams on April 11, 2015, 07:33:10 AM
I've had good luck with a 31x 10.5 hoosier,but trying a set of 2585' s this year.
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 11, 2015, 11:09:14 AM
Cody Nice looking car ! It's getting harder and harder to find the right tire for one of these cars ! The 2585 Goodyear is no longer in production but Jon Hansen bought  A bunch of them and might be able to help you out with a set. Have you run the car with the 10.5's ? I have a friend who is running a 10.5 on a F.E.D. and he is running mid to low 8's with his I will ask him witch one he is using . I have also run a Hoosier 12x33 Co9 compound and it was pretty fast but a very aggressive tire. Nice to see another F.E.D. here in the north east hope we can meet in person at the track ! Bill 
Title: Re: Rear Tire selection
Post by: codysisson on April 11, 2015, 03:38:38 PM
Thank you for the compliments and information.

Luke,
 I had a friend of mine take pictures for me and I love the effects of this one. I hope to hit all the nostalgia shows at New England Dragway and if all  goes well I would like to get over to Lebanon Valley at least once to support them as well. Also June 20th there is an old time drag race (330'), flag start 1972 and earlier cars and dragsters at Sterling Airport, Sterling, Mass. Should be a lot of fun!!

Bill,
 I first ran 31 x 10.5 Hoosiers that I loved but I was twisting the engine too high so I went an bought a set of Mickey Thompsons 33 x 10.5 which brought my gear down but I did not like the way they handled on the track and especially on the launch.  My thought now is to stick with the 31's, and raise the gear. I like the idea of as small a tire that works well. Everyone I have spoken with has recommended going to GoodYear but They do not seem to have the narrower tire so I would have to go to a 12" wide tire. I have a friend who has a set of GoodYears and I think I will be able to try them at my next test session. It is really good to know that Jon has a stockpile of these tires!!

I look forward to meeting you Bill and anyone else up here in the NE!!
Title: Re: Rear Tire selection
Post by: dusterdave173 on April 14, 2015, 11:56:56 AM
great looking car! I have a Worm 200 inch and have just started out--I also have the 33x10.5 MT's
What exactly did they do that you did not like? I have experienced some different things but thought it was the different tracks, staring line prep and...my inexperience--down track things have been comfortable--I have been looking for best air pressure, leave RPM, wheelie bar height, etc The Youtubes of your car look like it leaves perfect! Share more --help me with your MT experience
Interested in your engine combo as well.
Thanks
Title: Re: Rear Tire selection
Post by: codysisson on April 14, 2015, 05:09:40 PM
Hi Dave, nice to talk with someone else with a Worm Chassis! I only put 6 runs on the tires but each launch I felt as it shifted ever so much to the side. I played with tire pressure from 7-8 pounds but no difference. My first run the track was cool and at the 1000' foot mark i felt the tires break loose as the the car started to walk to the side and for the first time I had to drive the car back to the center. My times were very close to my Hoosiers 31 x 10.5. The Hoosiers launched and drove just as straight as a die. The only reason I went to the 33's was to to raise my gear ratio which it did.
The highest RPM i have left so far is 4000 Rpm. I finished the car last September and was only able to get 10 runs on it so I wasn't trying to push it hard. My wheelie bar height is 2", My Hoosier tires, CO7 ran the best with 7.75 pounds air pressure.

THe engine is a 366, 13:1 compression. .680" valve lift, ported Dart Pro II heads, filled block. The engine dynoed at 535 Hp at 7000 Rpm and there was more left  but I didn't want to push it too hard. All my runs I made I had the engine tuned according to my dyno data around 485 HP so there is quite a bit left.
Right now all I want is seat time. I plan to rent the track in a few weeks to do a bunch of testing.
I sent my converter out to be checked and what I was sold was a 5600 RPM stall but what I actually had was a 7800 RPM stall converter. Needless to say that should change things up a bit!!
Call me on my Cell anytime if you want to talk and let me know if I can help any other way.

Title: Re: Rear Tire selection
Post by: JrFuel Hayden on April 14, 2015, 09:46:32 PM
I have a set of M/T 33x10.5x15 that I got to try from a Heritage A/FD, he didn't like that they don't grow, which is what he was looking for. He tried tire pressures from 6# to 8#, and didn't like the way they handled. I know some racers want to try a narrower tire because they are not making 700-850 HP, and GoodYear is not making a 11" tire now, so on paper it looks like the 10.5 would be worth trying. In a way it's too bad the 10.5 tires are not made for FED's.   I was interested in trying them after seeing how much Matt Hadford from Total Seal Rings improved his B/DA [ before he went to Pro Stock] when he replaced his 33x14.5x15 GoodYear and Hoosiers. Matt picked up about 2 tenths with the M/T on 14" wide wheels. After talking to slick manufactures and some racers that pointed out all the 10.5 tires are designed for the 10.5 door car classes. So I think the biggest difference in those tires is a lot stiffer sidewalls to handle 3000+ lb door cars and softer compound to work with "dead-hook, shift, dead-hook, shift," etc. Most FED's are looking for more tire speed to keep from pulling the motor down out of it's HP range. 
 I never ran the 10.5's because I was advised that to make them work, I would have to run a 14" wide rim, not legal for Heritage JrFuel. Also they weigh 44 lbs, a whole bunch more than the 22.6 lb D2585 GoodYear 31x12x15 we run now. You know it takes power to turn rotating weight. A common idea is one pound of rotating weight is equal to 9-10 lbs of static weight. so if your car is over weight now, and your car weighs less than 3000 lbs, you might be better off trying the GoodYear 31x12x15. We started out running the GY 31x12x15 slicks on 10" wide wheels, and as we made more power we had to go to wider rims, 1'st 11" now 12". The wider rims also helped with 1/2 track traction, but the with the wider the rims the tires grow less, ie higher trap RPM and/ or lower top speed.
There are allot of Heritage and ANRA NE-1 [ 7.60 bracket] FED's running GY 31x12x15 on 10" rims.
Jon, Hayden Wheels, 800-624-3803
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on April 14, 2015, 10:07:09 PM
Opps I forgot, yes I have a special order in with GoodYear for 170 of D2585, 31x12x15 slicks which are being made now, so we should be getting them soon. Call me if you want any. The reason they are on a special order is GY put that tire on an "inactive list" in 2012 because of low sales, but this is the second pre-sold special order I submitted to GoodYear.
BTW, I also have a special order in for GY D1288, 33x12x15 which they will be making next month. 

Cody, who made your 7800 stall converter and what size is it, 7" or 8" or 9", and who's fixing it for you ?
We run a 7" A-1 converter in JrFuel, matter-a-fact, all but one JF teams are using A-1. I helped a SWJFA racer by letting him use one of my tighter 7" and he picked-up almost two tenths with his all iron SBC injected alky 700-725 hp FED. It's all about letting the motor run in the RPM range it's happy. A rule of thumb is stall should be 1000 to 1500 below your shift point.
Have fun !
Title: Re: Rear Tire selection
Post by: dusterdave173 on April 15, 2015, 07:11:31 AM
Love this conversation and feedback!
I put the 33 MT's on because John Worm said so-- and because I have a killer deal at my business on MT's.
Since I have brand new car-- have never had a dragster-- all of it is brand new to me-- though I have drag raced for over 25 years now--I love a door car because when you get it right it Stays right. I feel like by seasons end I will get a handle on the dragster. I jumped in and made full pass on my first run and it went pretty darn good. Now after visiting the track 4 times total 8 runs I see I have a long way to go. The big deal for me so far has been lack of good feedback after each run--I am yet to have same crew help. I got a video camera on for my last pass and learned more from that one run than all others so far. I feel like that will be a BIG help as the year goes on--My car hates a poor track, like test night minimal prep--It seems fine on good tight track--I started out at 11 lbs per Johns instructions and have had folks laugh at that so I have come down little at a time to now--8 lbs--car 60 ft'd the best at 11 lbs and high RPM launch --I like leaving at 2000 RPM range --I am foot braking--no interest in trans barke at this point--keeping it as old school as possible--I always loved foot braking --just the way I am. It did rattle the tires one time at the gear change on a very slick track--don't want that to happen again--Geeez! Can't afford the dental work--it was not fun!!
The more I talk with other dragster owners and the more I watch it seems that even the guys that have raced an FED for years will have issues from time to time concerning launch, tires, shake, etc
These cars seem mercurial at best. I am sure there are some vets that have one running like a Swiss watch but most seem to all fight same issues.
I am a rookie, need seat time and experience. I understand that I need to ask and listen --the only reason I throw out anything I am doing is in order to get a response from folks with experience so I can learn and Be safe.
I really appreciate this forum and the positive help.
I am having a ball and look forward to making lots of runs this season--My club Southern Slingshots is chock full of good guys--we have lots of cars--they have been super helpful.
I have strung the car several times--seems ok--rollout is within 1/4 inch at same pressure-have centered the wheelie bar several times-the video showed my last run making that slight "side step" that Cody mentioned on the leave so I am going to concentrate on good solid evaluation of each run, keep good records and hopefully get zeroed in.
keep the advice coming boys! Thanks
Cody , that is one NICE looking car--congrats! I know you are proud of it!
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 15, 2015, 02:35:47 PM
I was just looking in the Goodyear tire specs and they make a 29x12 d5 tire . I wonder how this would work . I guess ground clearance could be a problem . They also make that tire in a 13x31 .
Title: Re: Rear Tire selection
Post by: up in smoke on April 15, 2015, 04:08:38 PM
great feedback for us rookies just listening in. I am also a newbie with 6 passes and I am also saddled with the question of what tire, what launch rpm, tranny brake or no-tranny brake,,,ready to hear as much input as possible thanks
Title: Re: Rear Tire selection
Post by: codysisson on April 15, 2015, 04:14:38 PM
Jon, Thank you for the great feedback! The 7800 Stall converter was a 7", I now have a 9.25" converter that was recommended to me. The fellow who does the converters is in Texas, I am trying to get the name from my transmission guy.

What compound do you recommend for the Good Years? I also want o get another set of rims. I have a set of 10" Sander rims now but I want to have another set of mounted tires for back up. Where do you recommend I buy a set?

Oh I forgot to mention like you pointed out Jon, The MT's are very heavy compared to my Hoosiers!!
Title: Re: Rear Tire selection
Post by: George on April 15, 2015, 05:33:31 PM
Compare the weights of the tires and it's clear. The 2585 is designed as a light weight grow tire .
Title: Re: Rear Tire selection
Post by: dreracecar on April 15, 2015, 05:39:39 PM
FYI---Tires that come in a group that includes .5 numbers for tread are mostly door car super classes and do not grow whereas solid numbers are comp tires and do grow, plus they tend to GET-UP on the tire quicker
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on April 16, 2015, 01:27:53 AM
Cody, I think you should try your friends 12" GY, and if they work better call me, 805-444-4489 I'll put you on the list for D2585, & I recommend starting with your 10" rims at 6 lbs of pressure, and go down on pressure [ 5.75 - 5.5] if you are hooking up too much, and want more tire speed, and up if you want more traction [6.25-6.5].
I wonder if your 9.5" converter is too big, the only FED car I know that is using a 9.5 is a blown alky late Hemi A/FD, and he's making at least double the HP you are. My guess is your 9.5 will pull your motor down below your HP range. A good idea is ask your engine and/ or cam guy to find out your RPM range, and get your converter to work in that range. As an example, if your motor starts making power at 5000, but your converter stalls at 4000, your combo will struggle for 1000 rpm. The biggest increase in our JrFueler came when we changed converters. When you change to a bigger cam and/or more compression, you may have to change your converter stall [ flash point]. Which means you may not have to get another converter, just have a converter guy change the stator. I have changed at least 4 stators, after changing my motor combo's ie cam, heads, compression. 

Jon
Title: Re: Rear Tire selection
Post by: dusterdave173 on April 16, 2015, 06:11:06 AM
Up in Smoke
I hear ya--don't worry just keep on and experiment--Mt car will yank the spit out of your mouth leaving at 4000 but I have toned it way down on the leave  RPM until I get more seat time--the car really has multiple personalities depending on launch RPM, tire pressure, wheelie bar height etc  I also have a very loose converter that gives the car more 'range" It does pretty well no matter what--I am thinking a tighter converter would not be so good--I bought this one on a gamble but it has turned out fine.
My car does seem to pick up wheel speed with less tire pressure--I can lower it enough to haze the tires on leave--Everyone around me acts like I am crazy when I had 9-11 lbs in them but it sure did hook!!!!
My car also seems to like more weight on the nose so.....It is all a balancing act--check back about Labor day and I will know more :)
Keep records--have someone that knows what to watch keep an eye on every run--the REPLAY XD MINI video camera is less tha $140 delivered and is EASY AS PIE to use--big help!!!
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 16, 2015, 12:23:56 PM
While we are talking about tires I guess Jon might be able to answer this question . How much do you think that 2585 tire grows at 180 to 190 mph ? I am thinking about changing my rear gear from a 4.56 to a 4.88 . Right now I am crossing about 8700 at 182 and I think I should be crossing a little higher . Raising the shift from 8800 to 9000 picked the car up about .03 so I am thinking the gear change might help . I am still using a 1.80 first gear and thinking of going to a 1.69 . My 60 ft's are around 1.05 1.06 .Thanks Bill     
Title: Re: Rear Tire selection
Post by: Roger on April 16, 2015, 01:18:16 PM
Hi Bill, what size tires are you running to get those numbers?
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 16, 2015, 01:31:35 PM
Roger I am using the Goodyear 2585 tire 12x31 . My combination is a little different than most . My motor is a 394 cube smallblock with an old set of 18 degree Comp eliminator heads . I run a pair of Rons terminator 's on a sheet metal manifold . It's a little different but pretty quick and I an allways trying to make it quicker !
Title: Re: Rear Tire selection
Post by: Compsix on April 16, 2015, 07:47:37 PM
If anyone is interested we have a set of 31x12x15 hoosiers that we have two runs on and then decided to go a different direction with our tires. 

$400 you pay the ride.... 
Title: Re: Rear Tire selection
Post by: up in smoke on April 17, 2015, 04:18:34 PM
anyone out there ever try the hoosier 33x12-15 pt # 18350????
Title: Re: Rear Tire selection
Post by: George on April 19, 2015, 05:55:28 AM
Should anyone find a tire for an injected Alky FED that will out perform the Goodyear 2585 after a comparison please post some info. Thanks.
Title: Re: Rear Tire selection
Post by: JakeB23 on April 21, 2015, 06:56:42 PM
After talking to slick manufactures and some racers that pointed out all the 10.5 tires are designed for the 10.5 door car classes. So I think the biggest difference in those tires is a lot stiffer sidewalls to handle 3000+ lb door cars and softer compound to work with "dead-hook, shift, dead-hook, shift," etc.

I've never seen a 10.5 outlaw door car "dead hook"  From my observation it's a controlled spin for the duration of the run.

Do you care to expand on this?

I have a couple of questions, and I don't want to hi-jack the post, but here goes.

Disclaimer, I am known as an over thinker, and I don't want to be a smarty pants, but I am always curious.

There are a couple of JR. Fuel, Heritage, 4.99 minimum dial in racers on here, and there are also some bracket racers/nostalgia index racers that aren't concerned about the fastest ET, but more consistency and running the dial.

So here goes.  First, I see some opinions about "tire growth"  but why do you really want a tire to grow?  they way I see it, the more it grows, the less chance you have of having a flat contact patch?  Wouldn't centrifugal force push the center out?  Yes, I know NHRA top fuelers do this, but, they also have a huge wing. 

Second, I don't exactly understand the big deal about tire weight? I seen on Jegs the 10.5 mickeys were 33 lbs and the 32 12 hoosier's (D05) are 28lbs.  Yes, I know 5 pounds a tire is big when ET is in line, but if running an index or bracket, what does 5 pounds really matter?

Third, it seems that everyone wants their FED/Altered to "get up on the tire quick" and "wheel speed is king" Why wouldn't a stiff sidewall work here?

Just curious, not to be smart, all opinions welcome

Fire Away!
Title: Re: Rear Tire selection
Post by: dusterdave173 on April 22, 2015, 06:28:52 AM
Can't answer any of that but my 10.5 MT will spin with lower pressure and dead nut hook the slober out of your mouth at higher pressures  that is the exact opposite of what that tire has done on my past door cars FWIW .
The dragster is way different in lots of ways--it really digs crazy loose converter--my door cars did not
The math for lower weight on rotating parts will astound you at the performance diff it Should make--I am like you --doing this for fun so who cares but...real racers pee before a run and take the spare change out of their pockets
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 22, 2015, 11:19:34 AM
anyone out there ever try the hoosier 33x12-15 pt # 18350????
   I have used that tire on my car and it is a pretty good tire . It is a little more aggresive than the Goodyear and a little heavier . I think it is a good option for those who can't get the Goodyear . I plan on trying them again on my car at some point .Bill
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 22, 2015, 02:02:00 PM
Can't answer any of that but my 10.5 MT will spin with lower pressure and dead nut hook the slober out of your mouth at higher pressures  that is the exact opposite of what that tire has done on my past door cars FWIW .
The dragster is way different in lots of ways--it really digs crazy loose converter--my door cars did not
The math for lower weight on rotating parts will astound you at the performance diff it Should make--I am like you --doing this for fun so who cares but...real racers pee before a run and take the spare change out of their pockets
     Dave very interesting that your car spins more with less air pressure ! Could it be that with less air the center of the tire is not making as much contact with the track surface ? I pee before I run and I pee after I run ! I'm not sure if that makes me a real racer . I think it's just because i'm an old guy !!! Bill   
Title: Re: Rear Tire selection
Post by: dusterdave173 on April 22, 2015, 05:25:35 PM
I can't honestly say anything for sure--I have so few runs all on 4 different tracks so....The least run I made was at Rockingham--and the lowest tire pressure I have used so far and it hazed the tires off the line--really all could be in the tracks--early in year, test days , minimal prep--I need  a season before I start making many judgements at all  Fun as heck learning though!!
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 23, 2015, 01:54:30 PM
After talking to slick manufactures and some racers that pointed out all the 10.5 tires are designed for the 10.5 door car classes. So I think the biggest difference in those tires is a lot stiffer sidewalls to handle 3000+ lb door cars and softer compound to work with "dead-hook, shift, dead-hook, shift," etc.

I've never seen a 10.5 outlaw door car "dead hook"  From my observation it's a controlled spin for the duration of the run.

Do you care to expand on this?

I have a couple of questions, and I don't want to hi-jack the post, but here goes.

Disclaimer, I am known as an over thinker, and I don't want to be a smarty pants, but I am always curious.

There are a couple of JR. Fuel, Heritage, 4.99 minimum dial in racers on here, and there are also some bracket racers/nostalgia index racers that aren't concerned about the fastest ET, but more consistency and running the dial.

So here goes.  First, I see some opinions about "tire growth"  but why do you really want a tire to grow?  they way I see it, the more it grows, the less chance you have of having a flat contact patch?  Wouldn't centrifugal force push the center out?  Yes, I know NHRA top fuelers do this, but, they also have a huge wing. 

Second, I don't exactly understand the big deal about tire weight? I seen on Jegs the 10.5 mickeys were 33 lbs and the 32 12 hoosier's (D05) are 28lbs.  Yes, I know 5 pounds a tire is big when ET is in line, but if running an index or bracket, what does 5 pounds really matter?

Third, it seems that everyone wants their FED/Altered to "get up on the tire quick" and "wheel speed is king" Why wouldn't a stiff sidewall work here?

Just curious, not to be smart, all opinions welcome

Fire Away! 
          Jake I tend to over think things too but that's what racing is all about ! When a tire grows it is like having an extra gear for more trap speed . For most of us this helps us go quicker ! The heavier a tire is makes it harder to accelerate . Lighter is always faster and 5lbs can make a big difference . I have never tried a stiff sidewall tire like the 10.5 but I think you would have to change some things to make it work . The quicker you can make your tire go round the faster you will go . I run a soft sidewall tire and at the hit the tire will squat and hit the bar and after a couple turns come up on the tire . This has worked the best for me ! I hope this helps ! Bill     
Title: Re: Rear Tire selection
Post by: wideopen231 on April 25, 2015, 08:27:36 AM
Another over thinker,normally gets me in trouble.
Stiff sidewall would seem to be able to go round  sooner.In fact I talked with 3 different MT reps and they all recommended the 3074S over the 3074. On post I started on tire size so as not to hijack this one.I had comment on 14" wide weight being more than 12".Yes it is but  not much,for some  reason in the MT lineup there is lot less differance than in GY. Nothing against GY I have ran them for decades. I just want to try the MT's because of tons of good comment ont them from bracket guys.

  I maybe over thinking it and come up bckwards will not be first time.Bad thing about thinking it thru you can make  good reason for things to work on both sides of the coin. Reason I say the non thinkers are blessed,  They don't come up with reason it will not work and just try it and eventually luck into something.
Title: Re: Rear Tire selection
Post by: dreracecar on April 25, 2015, 09:18:48 AM
The problem with tire reps is that many are not familier with front engine dragsters and what their  needs are. Rear motor Comp & Super classes and door cars are what they see the most.
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 25, 2015, 09:57:32 AM
The problem with tire reps is that many are not familier with front engine dragsters and what their  needs are. Rear motor Comp & Super classes and door cars are what they see the most.
    And Goodyear stopped producing the 2 tire numbers that most of us use !
Title: Re: Rear Tire selection
Post by: wideopen231 on April 25, 2015, 10:57:29 AM
 Two dealers suggested stiff wall.Both said they had tried both on customers cars and they all liked it better.2 seperate calls,2 dealers half country apart. Either they got memo or had experiance with tire on FED's. Just saying.
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on April 26, 2015, 03:19:27 AM
Wideopen, I had the same results when I called "dealers" in 2012 when I found out GoodYear had put a number of tires on a "inactive" list, including all the tires used by JrFuel racers and most all other FED racers running injected alky. I called ALL the slick manufactures looking for a replacement for the GY 22.6 lb 31x12x15 D2585. I found the "dealers" were just looking at their catalog and really didn't have enough info on real apps, just sizes. I got much better info when I called the manufactures, case in point Hoosier told me their 31x12x15 weighted 33 lbs, and had a stiffer sidewall and would not grow much, their 32x12x15 slick had a softer compound made for door cars shifting multiple times, where I got the term "dead-hook, shift, dead-hook, shift" and the stiffer sidewalls has to do with the heavier door cars. The reason I focused on 12" tires is because rules for JrFuel and A/ND, B/ND  slicks are limited to 12" . But during my search for choices of 12" tires I found out GoodYear would make another batch of D2585's IF I gave them a solid order of at least 150 tires. At the 2013 WinterNationals I gave them the order of 180 tires, mostly pre-sold, and we received them in Aug of 2013.
Bill, the 31x12x15, and 33x12x15 GoodYears are still on the "inactive" list but I have 170 of the 31's on a special order, due to be made this month, and hopefully shipped in May, so if you want some, call me and I'll put you on the list. BTW most are pre-sold, so let me know soon. I also have 150 D1288, 33x12x15 on another order, due to be made in May.
I agree with Bruce [ Dreracecar] most tire reps don't have much FED info. I talk to engineers, and production schedule guys.
Now to the question of what size tire should I run, well it does depend on HP, car weight , transmission , converter, rear gears, wheel rim width, and 1/8 or 1/4 mile tracks. Basic, the more HP and or the more car weight the bigger the slick, and maybe the wider the rim, of course depending on track conditions. For instance, Bill's FED runs 182 mph, which tells me he's making about 750 HP, and the D2585 on a 10" wide rim with a 4.30 or 4.56 rear gear, would be a good place to start, if his car, with driver weighs under 1500 lbs.
Our JrFuel, with the all iron 850 hp SBC runs the D2585 on 12" rims, at 5 3/4 to 6 1/4 lbs of tire pressure, launching off the trans-brake at 6400 RPM, with a 1.68 powerglide 1'st gear, and a 8500 stall 7" A-1 converter, and a 4.88 rear gear. Which is close to what the other Heritage JrFuelers run. Scott Parks with their new Hemi are running M&H 33x12x15 tires, but their car set-up is different with the motor location is 52" from the the rear axle, and converter flashing at around 9200, and launching around 9000, and shifting at 10,500, but then again the best Scott has run this year in his "JFB" car is 6.81. I also, just talked to a racer racing A/ND that ran some good numbers with 29x10.5x15 MT on 12" rim, on his 950 HP 14° SBC, with a 1.64 first gear, and I think a 4.56 rear gear. He went with the 29" tire I think, because he has a 12 bolt drop-out rear which has fewer choices of gears, and wanted to try higher RPM's. Of course these are higher performing FED's but i know many NE-1 cars running fixed Bracket 7.60 with the D2585's on 10" rims, and most in not all of the SWJFA racers running 7.80- 7.20's running the D2585 on 10", 11" or 12" rims. I have found going to a wider rim helps when we race tracks with not great traction.
As far as the weight of tires, the key is rotating weight, the lighter tires will "get-up-on-the tire" sooner, also one pound of rotating weight is = to 9-10 lbs of static weight. So if you go by the old idea of "take 100 pounds off your race car you'll pick-up a tenth", if you take 10 lbs of of any rotating weight, you will pick-up some ET. So Jake if you go from 33 lb to 22.6 lb tires it would be like taking 100 lbs off your racecar. And like Bill said you can run a bigger number rear gear if your tires grow, which will get you better 60' times, with-out over reving your motor.
And Yes, Bill running lower tire pressures will give you more tire speed, because the tire will concave a bit and run more on the edges of the slick. You can confirm that by checking tire temps with your infra-red temp gun right after a run, checking it across the width. I always check tire temps after a run to see if it's spinning the tire too much in the middle of the run.
I have not talked about the results I get from my RacePak computer, because I assume most racers on this site don't have a data computer, but I make decisions on tire pressure, launch RPM, and even converter stall by looking at the peak driveshaft speed right before the tire hook-up, which is mostly around 3 tenths into the run. I look for around 2200 rpm.
Now you all can try all kinds of combo's but I have in my over 50 years of dragster racing started out running what the fast guys have learned and are running, and when I was running as well as those guys started trying new stuff. As an example, when we were racing our dual engine BBC Top Gas dragster we wanted to be on of the the 1'st TG dragsters to go over 200 mph, we tried softer valve springs and went 204.
I hope this answers some questions, and I bet raises some more questions. On another post I will tell you the history of how the JrFuel slicks developed.
Feel free to call me 805-444-4489, Calif, Hayden Wheels.   
Title: Re: Rear Tire selection
Post by: wideopen231 on April 26, 2015, 08:26:44 AM
Jon,

 As always very informative.

Would like your input on tire selection. Since combo little different than most and purpose bracket race consistency.

Car 225"
engine 50" out 526 Alum Hemi should do little over 1050 HP computer program calls for 1150 not to sure I buy that,no real world dyno YET.Normally pretty accurate given correct input.
rpm wise   power band should be 6000 to 8500
 1.68 with 6600 stall
4.11 at present changing gear is no big deal

 15x14 weld aluma star wheels,call them semi lite. Reason for 14 got them super  cheap.
 Hopefully car and my fata-- 1550 at very most,hey down 55# on driver. and not on race diet yet.
 goal is to run 1/8 mostly brackets and mid 4's if powers there it should not be issue. If I go too fast ,oh well. Not a hold you to thing just your input from your experiance . Computer fun what could happen but real world experiance normally wins out.
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on April 26, 2015, 01:38:13 PM
Mr Wideopen, yes you have a different combo, hard to find a race team to learn from with a different combo. So I just called a friend that races a alum 500" Brad Anderson type Hemi, on alky with a powerglide, but with 1.54 first gear, and 4.71 rear in 225" FED racing Heritage A/FD, BUT he runs a blower making about 1500-1600 HP. He is now running GoodYear 33x14.5x15 D2070, and his motor is out 46", at 1900 lb [ min weight for A/FD is 1875] running 6.40's in the 1/4.  OK not your combo, but I wanted a start point. The guy that bought his old car runs a 468" BBC [ motor out of a boat], with 4.11 and using GoodYear 31x14x15 D1984, but racing EZ 8.60 NE-2 class.
One thing I'm thinking is your 526 should make allot more torque than our JrFueler because of the engine size and of course longer stroke, longer strokes make more bottom end power/ torque, which I would think you might want the motor closer to the rear to get better traction with your 526. I would suggest you look at GoodYear 32x14x15 D1984., or 32x14.5x15 D1672, now both of these are on D-5 compound which is a hard compound, so it will help you keep the RPM up, and it's the the same compound we use. My A/FD guy has tried a couple of softer compound slicks and had traction problems, we think it might be the softer rubber would ball-up some and then spin.
One thing I wonder about is your 1.68 first gear, a 1.69 is a large carrier gear, where as the 1.68 is a smaller/ lighter carrier. Larger carrier is for the higher HP/ torque combo's, so you might want to check with your trans guy to make sure that is want you want for your 526. Over the winter we sent our trans to Rossiler to have checked-out and they said we needed to replace the 1.68 because it was showing some cracks. If it was me I would be thinking of stepping up the rear gear, since you will race 1/8 mile, like 4.71-4.88, just check for expected 1/8 RPM,  with your 4.11 I don't think you'll get to your 8500 range. Now if it turns out you keep breaking out of your bracket you can go back to the 4.11, but remember a bigger number gear is a HP/ torque multipiler, and help you until you get the rest of your combo figured out.
You engine location might help, since you should be able to have less weight on your nose. Have you weighted the car yet, our JF car with our all iron hemi weighs 1535, and with the SBC it's more like 1435, with drivers. BTW we run 4.40's in the 1/8 with our 4.88 gear in the SBC and 4.56 with the hemi.
How did you figure your expected HP ?
I hope this helps, let me know if you want to get either of the GoodYears, I can get you a discount., 805-444-4489
Jon
Title: Re: Rear Tire selection
Post by: masracingtd1167 on April 26, 2015, 01:46:40 PM
Jon Thank's for the reply's ! Very interesting stuff !
Title: Re: Rear Tire selection
Post by: wideopen231 on April 27, 2015, 09:54:10 AM
Thanks Jon. My bad on the gear it is 1.69 not 1.68. Have not weighed car yet and hoping for less total weight than stated,never upsetr when they weigh less. Hoping for high 1400's,but with battery and cpl extra electronics trying to keep expectations realistic. Aluminum carrier ,aluminum pump in trans , minimze everything,plus drilling holes in holes to get air out should help.   Right now 4 gallon tank and battery on nose,215# driver hanging out back. Have fire bottle and NOS bottle(mostly topend and some midtrack) to mount that can be used for ballast also.

  The 50" out was changed during build after long talk with that Parks guy.The 4.11 is in because it was here. I have 4.30 and 4.56 I can get to try at any time. $.11 is leaving sme on table for 1/8 but not so much 1/4 mile.Not many 1/4 mile tracks we might run but a few and with bracket deal I need can do both combo.

On the expected HP number. Don't laugh to hard. I used desktop dyno program. Was skeptical at first. After running number real worl combos thru it and getting aroun 1 to 3% differance in real dyno number I have come to respect it more.  If you give it real numbers for headf flow,induction system,real compression and accurate cam specs it will impress you with its accuracy. I am amzed anyone can write a program that can run as many compariosns and get in ball park much less as close as it does.Main thing I have found is cam and HEAD FLOWS,imagine that.

If interested and have real dyno and numbers needed I can run them thru program and see how close it comes.Kind of hobby checking and working with it while wife watchs tv at night. Alann Starr once told me "If you go a day w/o learning something new you wasted a day of you life." Pretty sure learning anything on engine would qualify with the old man.

  Sorry but glad to see Im not only finding it hard to find info on simular setup. Heck if it was easy it would bore the heck out of me. Done a lot and not much of has been picked because it was easy.

  Thanks for input and info you found out from contacts.

To Op sorry not trying to highjack thread,figure info in public room better than PMs where only one learns.
                                                                                                  Chris McBride
Title: Re: Rear Tire selection
Post by: JakeB23 on May 01, 2015, 09:30:17 PM
This is good information.

What about air pressure? What is everyone running for air pressure?
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on May 02, 2015, 12:03:37 AM
Jake, good question. well lets see "what is everyone running for tire pressure" ;
Scott Parks ran 4 1/2 lb in his 33x12x15 on 12" bead lock wheels  in their NHRA record [ 6.76, 197 mph] holding A/ND with their 385 ci SBC with monster flowing heads. Scott and Frank's car has the motor out 52" to help keep the tire speed up since the big head motor makes less torque than any other A/ND racing. Again less tire pressure gives you more tire speed.
i just talked to a racer just having fun in his low budget FED running in the 8's using 10.5 slicks running 7 1/2 lbs of pressure.
A friend racing Heritage A/FD with a blown alky late hemi runs 32x14.5x15 GY runs 6 1/2 lbs and 6.40's
We run 5 3/4 to 6 1/4 lb depending on track conditions on 12" rims with D2585 GY 31x12x15 running 7.0's @ 188 mph.

So what is everyone running ? If you are asking about what you should run, as you can see, it depends on your combo, clearly if you are running a 355 ci SBC or a 526 ci blown alky BBC you will need different slicks, rim width, pressures, launch rpm, weight of car with driver, weight on the nose, height of wheelie bar, trans gear, rear gear, and converter.
 I'm sure you have heard this before "it's the whole car combination". 
Our driver, when he was racing his own JrFuel "A" car picked up almost 2 tenths by changing converters, nothing else. Kinda like the last piece of the puzzle, it let the motor run in the RPM range it wanted.

Jon Hansen, Hayden Wheels
Title: Re: Rear Tire selection
Post by: JakeB23 on May 10, 2015, 06:14:52 PM
Ok, I wanted to update this post since I had some questions, and now I have some results.

I have a 225" FED that runs 5.40's in the 1/8th and 8.70's in the 1/4, (well, did atleast)

I started with 33 x 12 MH slicks, tried 7-9 psi, settled on 8, and car went 1.22 60's

I borrowed a set of 32 x 14 Hoosier's, tried 6-9 psi, settled on 7, car also went 1.22 (fastest)

I bought a set of 3069W 33 x 10.5 MT slicks. I thought the $269 a tire was reasonable, and at the time Hoosier 33 x 12's were 3 weeks out, and 33 x 12 GY's were a month out.  I'm Impatient, and I wanted to stay with a 33" tire.  Also I had used to run 28 x 10.5's MT (M5) compound on a 6.80's bracket car that didn't hardly need a burnout to hook, so I wanted to try them for my FED.

I tried 6-10 Psi and settled on 7.  Car went a 1.18 60'    Fastest 60' I've ever had, now I did have to slow down the shift this weekend to run an index, but I CAN'T WAIT to unleash this thing and see what it will run now!

Disclaimer. I don't know how old the MH or Hoosier's were, but there were both at least 3 years old.  The Hoosier's I ran on a 15" rim, so there was definitely added weight for that wheel/tire combo.

Either way, I wanted to let everyone know my results as this is what helps people learn.

Title: Re: Rear Tire selection
Post by: masracingtd1167 on May 11, 2015, 01:59:51 PM
Sounds like you are going in the right direction ! .04 gain in the 60 is very good !
Title: Re: Rear Tire selection
Post by: wideopen231 on May 11, 2015, 02:47:49 PM
Eager to hear how the MT's workout on full run. I am leaning towards them for new set for car. You do R&D helps my wallet.LOL
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 16, 2015, 04:21:52 PM
OK
After a big week end at Steel in Motion I have news to report
I have discovered my car LOVES to leave from idle
I sort of found the cure for everything
I am at 8 lbs on my MT 33x10.5's--leaving from idle Vs. raising the RPM has calmed all the ills right down
It made two fantastic passes --track was great and it was Rocking down through there!
Car hooked smooth and launched straight as a bullet everytime leaving from dead idle , footbraking
I have finally found what it likes so all the tire pressure ups and downs and spinning / not spinning etc seems mostly to have been about the track prep or lack of
On a good tight track car has always been good but this wk end I think I found the key
Yahoo!!!
Title: Re: Rear Tire selection
Post by: jspell on May 16, 2015, 05:37:20 PM
Hey Duster Dave, how about some ET & MPH numbers????  Glad to hear it's sorted out.....
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 17, 2015, 04:23:37 AM
I also added another 8 lbs to the front for total of 40 lbs
It really seemed to Make the combo
I will admit that at the Show yesterday there were no clocks just flag and go but I was able to tell none the less--It is Working like a car should now!
Added weight, leave from idle, wheelie bar about 3 inch ( no higher) tires 8-  8 1/2 range and
Away we go! Car smooth as a new jar of Skippy!
Seems like everything got better with leave from idle--I had left as high as 4000 range--mostly around 2500  It would leave hard as $%&# but was too violent at the hit just upsetting everything
Now...I really feel like I have a handle on it

I feel ready for the season now!
One note--it has never bounced at all during shut down and it did this week end--don't know if it is the lower tire pressure ( lowest I have run) or maybe was track surface--I am usually like Gladiator and tour the top end like checking out the dirt where I am going to fight but this is the ONE time I did not check out top end and it was some hard bounching down there--I think it was the track and maybe I got on the binders a little too hard too fast --That was No fun at all--I got back on it for one second and then eased on the brakes and was able to calm it down--Bounced my helmet off the cage a time or two--
I keep learning this thing, maybe by about Sept I will have a real handle on it all.
Title: Re: Rear Tire selection
Post by: codysisson on May 23, 2015, 03:31:26 PM
I had my first test and tune of this year last Wednesday. New convertor picked up1.5 tenths and 5 MPH. 8.20 @ 160 MPH. I I ran my Hossier 31". I started at 7.5 pounds and ended up @ 9 pounds for a cold track. Air temp was 62 degrees.

WE have our first nostalgia race at New England Dragway tomorrow. I hope to see some of you there??
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 23, 2015, 05:37:15 PM
Those are rocking numbers! 8.20 is fantastic--You have it now--
Any converter change that gains like that is great--really means you were not off by much at all --but sure went the right direction on "tune up"  Great results!
Title: Re: Rear Tire selection
Post by: masracingtd1167 on May 24, 2015, 04:40:50 AM
Dave is this your car ?
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 24, 2015, 05:51:44 AM
Thats her! We had a great time at Steel in Motion show last weekend--
Fantastic car show!
Title: Re: Rear Tire selection
Post by: retroboy on May 25, 2015, 12:03:26 AM
I love that no one seems to paint their cars anymore  (myself included ). The bare metal look rocks .
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 25, 2015, 04:33:04 AM
I had a paint scheme done by great local designer--but when I priced materials I almost had a stroke-had name lettered on cowl and that is it! That is my first tin bending so cowl is not as slick as Calif cars from back in the day but hey...did it all myself.
Title: Re: Rear Tire selection
Post by: codysisson on May 25, 2015, 01:13:45 PM
Nice looking car Dave!!

I have some more data from the race this weekend. I ran 5 times, the first 4 laps were 8.21 - 8.27 @ 161-162 MPH. 31" Hoosires, 9.25 ponds of air, 8200 RPM through the lights.

I went out in second round but was able to take one last test run so I put on my 33" Mickey Thompson tires. I went out 30 minutes after my last run , the track temp was 110 degrees both runs. 9 .25 pounds of air pressure. The fourth run I ran 8.244 @ 162.18, the fifth run with the M/T's I ran: 8.249 @ 161.63, 8100 through the lights. 60' time was .014 slower with the M/T's but they launched hard.

I learned  a whole lot with all those runs. I am very happy the car is so consistent. I hope this isn't too much information but since I started the conversation and received a lot of great advice and information from all of you, I wanted to share what I found out.

I still need to pick up 2 tenths because we have a great 8.0 program here.   So I am going to drop my gears from 4:57 to 4:11 to get the RPM in the correct power band of the engine and hopefully pic up a tiny bit there.
Title: Re: Rear Tire selection
Post by: masracingtd1167 on May 25, 2015, 02:32:00 PM
Cody I have a 4.30 ring and pinion that you could try ! Nice job on your runs !Bill
Title: Re: Rear Tire selection
Post by: wideopen231 on May 25, 2015, 02:49:54 PM
Cody,

  Question why do you feel going to higher gear will pick you up?Don't take it wrong just seems odd unless you have reason to believe its to much and calming it down will make quicker. I have done just that.Spent 3 years(match race 1 time per) trying to run a 3 second 1/8 at local track.The year I said screw it and dropped blower ,pulled some clutch and added little fuel.Bam 3.98@183,first 3 second run on that track.
What is low in trans? What converter stall?
Title: Re: Rear Tire selection
Post by: codysisson on May 25, 2015, 02:58:59 PM
1:76 trans gear, 5700 stall

I dynoed the engine and it starts to fall off around 7200. I am going through the lights @ 8200 and it is falling off before the lights. My thoughts were to get the rpm down closer to the max power curve. Does that make sense or am I not thinking correctly?
Title: Re: Rear Tire selection
Post by: wideopen231 on May 25, 2015, 03:19:16 PM
Makes sense to keep in power band. How about trans gear. Big thread here about 1.69 gear. Easier off line,might be able to add rpm at hit. Shift would be out little more which shoul lower rpme some in lights.

Next and what  I would look at cam? If can use more power ? why not give her what she wants. Know nothing of your combo. If mine I would add 10* duration and move powerband up. Maybe look at compression if possible. Problem is means retuning combo if rasing power.

Thing is .2 can be easy if setup is off.If its tuned pretty good it can be huge to get that much.With the way you are running it looks to be tuned pretty well. Bad tuneup rarely runs consistent number.

Now this is from old blower guy who has not made pass in FED  YET,so take it with grain of salt.
Title: Re: Rear Tire selection
Post by: wideopen231 on May 25, 2015, 03:35:43 PM
I hope my combo works out to be as consistent
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 25, 2015, 04:02:58 PM
Cody those numbers sound fantastic ! Please tell me more about your engine combo--I am very interested in what it will take to get that ET since we have the same car more or less
BTW I have a 4.22 gear with my MT 33's --My Nascar pal has lots of odd ratios --it is fun to look through his inventory.
I am running well but my little ole 355 CI is stuck in the 5.60's
I am very  interested in what temp do you run it? Cam numbers, what type heads, etc
I have been told I need to get mine hotter before a run so just curious.
You have to be proud of that car and yourself--way to go!!
Title: Re: Rear Tire selection
Post by: codysisson on May 25, 2015, 05:25:26 PM
Dave, The engine is pretty mild mannered. It dynoed at 535 HP @ 7000 RPM, 400 Ft Lbs Torque. Peak torque of 463 FT Lbs @ 5900.
360 CI stock stroke, .060 over bore
12.9 CR
Filled block
Dart Pro II aluminum heads, ported, (no flow Numbers)
Comp Cam, custom grind, .682 Lift, 272 intake Duration, 280 Exhaust measured @ ,050. 108 lobe separation.
Hilborn 2.5" Stack injection

I don't have a temp gauge but the hotter it is the faster it runs.
Title: Re: Rear Tire selection
Post by: dusterdave173 on May 25, 2015, 07:19:02 PM
I think my first time with no water and alky --I have been scared of baking it--what I have found is that I can even drive it back from the top end if I have to--I am sure I have not been hot enough at the line--so that is my next move to see what happens. May be closer than I think to some lower ET's--
Thanks for the information
Title: Re: Rear Tire selection
Post by: wideopen231 on May 26, 2015, 05:00:37 AM
180* if looking for et,should still have no problem driving back.Lots of guys try to run in 150 to 160 range for consistency and find out 10* hotter will pick car up.
Title: Re: Rear Tire selection
Post by: JakeB23 on June 03, 2015, 07:56:29 PM
Just an FYI, my car ran - 1.199, 1.200 and a 1.199 60' this weekend. On 33 x 10.5 MT's

Lost in the third round by .005 super pro..

My Lazy .026 didn't cut it. 
Title: Re: Rear Tire selection
Post by: Frontenginedragsters on December 17, 2015, 07:37:31 PM
 This thread has great information in it.
Can you guys submit updates from the 2015 season?

Matt
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on December 18, 2015, 09:36:28 AM
Well, we run the Goodyear 31x12x15 D2585 tire on 12" wide rims, in our Heritage all iron SBC 870 hp JrFueler, weighing 1435 lbs with driver.
We run 7.0's with 1.01 to 1.03 sixty foot times, running 5 1/2 to 6 1/4 tire pressure, depending on track conditions.
Our last Div 7 and CHRR we ran 33x12x15 Goodyear with a bigger number gear 5.13, with a best of 1.03 60', and 7.03, 187.44 mph.
It's all about your total combo, the 2015 NHRA Comp Elim Champion, Craig Bourgeois, runs 29x10.5x15 MT with 5.13 gears running a best of .956 sixty's with a looser converter than I run, and may have to click it early when he hits his 10,600 high rpm chip. But I think that works for him at National event prep tracks.
BTW I still have some 31x12x15 [ the lightest at 22.6 lbs] and 33x12x15 Goodyear slicks that I special ordered, because GY has them on the "inactive" list.
 I hope this info helps.

Jon Hansen, Hayden Wheels, 805-444-4489
Title: Re: Rear Tire selection
Post by: Frontenginedragsters on December 18, 2015, 06:46:25 PM
 Jon:
Thanks for the update.  :)
I will get ahold of you in early spring and see if you still have some of the tires left for sale.

Thanks: Matt
Title: Re: Rear Tire selection
Post by: nitroscott on March 22, 2021, 02:22:40 AM
I am having the same dilema trying to decide what tire to put on my Alchy 200" FED that I am building with 350 SBC Hilborn stacked injectors. Probably 500 hp. Should I run a 10, 11 or 12"? So far I am looking at
MT 3062
MT 3064
MT 3069
GY 2797
GY 2585 are too expensive
Title: Re: Rear Tire selection
Post by: JrFuel Hayden on March 22, 2021, 04:50:41 PM
Scott I agree the GY 2585 is not the right choice , that is the that most of us new Gen JrFuel [ 6.80's to 7.0's ] running  400 ci alky burning 3.5 lb/ci all iron motors , and my team is going to try M&H 30.5x 10.5 [ 11.5] x15 and MT 31x 10.5 [ 11.25] x15 on 12" wide rims . The Mickeys and MH are at least 4-5 lbs heavier than the GoodYears. More rotating weight takes more power. The MT like wider rims like 12" but in your case 10" would work good on the GY or MH .
But I think your tire picks listed may be too big for your HP , our JF car is going to try 10.5 tires because we get tire shake , enough so we have broke a rear engine motor plate , cracked front steering mount, and a windshield. We think tire shake comes from not enough power or too much traction. With the tracks using more and more VHT the tires will dead hook , wind up the side walls and shake, The only JF team running a bigger tire is running and winning on MH 33x12x15 but he is making 1000+HP @ 10,500 rpm with a 5.38 rear gears. Twice what you are planning. The 2020 Comp Elim champ is a B/ND [ JrFuel type ] is also making 1000+ HP , but he is running the MT 29 x 10.5 [ true 10.5 "] x15 tire with a loose converter , my guess 9000 stall, so it doesn't hit the tires so hard . Which might be a good choice for you , or a GY 28x 9 or 10x15, unless you will be racing at no prep tracks with limited VHT. The reason FED want a little less traction is to keep the RPM  up to where the motor is happy , otherwise it will pull the motor down below its power range.
BTW call Don Enriquez at Hilborn, he can help you set-up your FI , Don is a muti year JrFuel Champion , he has been driving dragsters for over 50 years
My Company Hayden Wheels are Goodyear and MH dealer and I could give you a deal. 805-444-4489 cell # Jon Hansen 
Title: Re: Rear Tire selection
Post by: nitroscott on March 24, 2021, 11:06:03 PM
Jon, I sure appereciate you wanting to help. I know what to use. I just love my front wheels and tires that you sold me. Don't know if you remember them (Generation Pro Wheel Three), they have chrome hubs. They're going to look nice on the car. I will give you a call today to get the slicks. I ran out of 1-1/4 .058 and I need one more 23" piece for my K member unless I can use 1-1/8 for the K.
Title: Re: Rear Tire selection
Post by: Curly1 on March 29, 2021, 04:03:24 PM
I am currently running the MT 10.5 W x 33 with tubes and they work good on my 225" FED but my car has radiator, water pump, transmission cooler and full body. Runs 4.85 to 50.x @ 1730Lbs with me in it.
Title: Re: Rear Tire selection
Post by: nitroscott on March 29, 2021, 07:44:13 PM
I decided to go with 29.5 x 10.5-15W. I needed to figure out what tire I am going to run so I can finalize the chassis. Thanks for responding.
Title: Re: Rear Tire selection
Post by: Curly1 on June 22, 2021, 05:24:24 PM
I want to say something here about this. With our Front Engine Dragsters very few are the same. We have some with 1000 Hp and weighs 1350 with driver. We have others that flex like crazy and some that do not.  It would be very hard to say one tire works better than another on our cars with so many variables.

With the Rear Engine Four link Dragsters they are all very close in weight, suspension chassis stiffness most of them even paint them the same with tribal swirl paint jobs. It is not hard to get a good tire for one of those and you can adjust the chassis some if they do not work.

With our front engine dragsters each is a different animal and hard to say exactly what will work on it.