FrontEngineDragsters.Org Forum
Drag Racing Discussions => Front Engine Dragsters => Topic started by: opa1 on May 07, 2019, 02:08:01 PM
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Ok guys, I've had my FED for sale for a while. No one has bought it yet. So I'm thinking about taking it out and using the transbrake this time around. I have methanol stack fuel injection. What's the best way to approach this? Set the two step and floor it? I need to take out a bit of frustration! lol
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Around here most of the fast guys in REDs w/ BBCs use a two-step set at around 4K RPM. I think I'd start there.
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I set the limiter to 3800 and floor it. Works so far. Btw, make sure to put you head back against the roll bar or headrest before letting go of the button. ::)
Tony
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The use of a wheelie bar is advised at this time........
Have fun
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I have a 6ft. wheelie bar. Just wasn't sure on the flooring of the throttle. Thanks for the tips.
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How much HP, what size of tires, and 2 step?
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I liked to leave between 3K & 4K rpm with or without a 2-step. Even when using the 2-step, very little throttle opening is required. You don't want the throttle blades wide open with no pump speed. It will be lean and may hesitate. Stage it above idle (about 3500 rpm) and let go the trans brake button and mat the gas at the same time. We got 1.08 -1.10 60 ft. times and reaction times around .030 sec. if I was paying attention.
Mike
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Cpl opptions. One is as stated using two step at lower rpm and have it release when brake does if not running delay box. You can also go with SLE which I have and not sure about running or not. I Use to run my Nova as follows. I would stage Bring rpm up to about 4500 and on third bulb i would nail it as I released the button. Regardless what a lot of folks will tell you you can be consistent doing that way too. That car was dead consistent even with nothing more than a transbrake and a driver staging ND changing gears,believe it or not thats what drivers do.LOL Now days they push brake and let go of button.
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How much HP, what size of tires, and 2 step?
Goodyear D2585/ 8-3/4 mopar 4:86/ Msd box. Not sure on HP. Currently running 5:60- rich and footbrake.
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I have the two step set in the mid 4000 range. First bulb, I roll into the throttle to full. Works every time. Tried leaving on the floor, but the car doesn't like it. Faster 60 ft times getting the wheel speed up.
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Hi Mark - have you looked out the window yet, you’d think we’re in the middle of Winter here. Alan
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I would like to know how it runs leaving off transbrake.
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I'll report if and when I get the chance to take it back out. :(
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Where your two step is, is directly related to where your converter stalls. Everything I've read over the years, is max effectiveness is roughly 500 rpm under your stall rpm.
Beyond that, you can tune your reaction times with where the two step is.
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Where your two step is, is directly related to where your converter stalls. Everything I've read over the years, is max effectiveness is roughly 500 rpm under your stall rpm.
Beyond that, you can tune your reaction times with where the two step is.
Yep. Ran the FED with trans. brake. Foot on the floor, left at 5800. Convertor stalled at 6200. Shifted with rpm module and electric solenoid from 6600-7000 depending on track. Most of the tuning was with tire pressure and wheelie bar height.
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Wow, Greg, 500 rpm under stall, that would be way too high for us , we stall 8500-8700 with the SBC JF car , but what seems to work good for our car is leaving around 6400 rpm giving us 1.01-1.04 60' times. Keep in mind the higher you launch at the quicker the RT you get.
Again it's all about your combination , Greg you are running a blown alky SBC, running in a breakout class, we are running a 10k rpm injected alky no break-out JF . We need to get some tire spin going at the hit, yours makes more torque because of the blower, and you no-doubt run a 8" tighter converter than my alum light weight 7" converter. I still run a 7" but tighter converter with our Hemi [ more torque].
We shift at 9600-9800 rpm with the SBC, and 9500 with the Hemi.
How high you launch has to do with what RPM the motor comes on at, track prep, tires , tire pressure, rim width.
The other issue is tire shake, I think tire shake is caused by TOO much bite dead hooking then unwiding of the side walls. Too much bite , I let some tire pressure out so the tire works more on the edges of the tire thus reducing the footprint . To check that out I use my temp gun at the turn-out and read temps across the tire, ei hotter on the edges. On our Gooyears we run 5 1/4 to 6 1/4 lbs, depending on track conditions. i have heard as low as 4 3/4 with bead locks on a low torque engine combo. My GY guy has said that more and more racers are having tire shake issues because the tracks are over preping the tracks [ TOO much VHT] that is why I'm going to try some other tires, like 31x10.5wx15 M/T and M&H. No doubt I'll need to try different tire pressures [ MT like high pressure] launch rpm , and rim widths.