Author Topic: 1.69 low gear  (Read 9226 times)

Offline masracingtd1167

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1.69 low gear
« on: April 28, 2015, 11:57:00 AM »
We have been talking about tires a lot lately how about gear ratio's for a powerglide ? I have been using a 1.80 low gear and I am told that I should use a 1.69 . Have any of you tried both and what did you find . Thanks Bill 

Offline Pipe Dreams

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Re: 1.69 low gear
« Reply #1 on: April 28, 2015, 01:50:49 PM »
   I'll second that. Been looking at new planteries for my powerglide with differant ratios. What's the benefit of a 1.69 over a 1.76 or mas's 1.80?

Offline wideopen231

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Re: 1.69 low gear
« Reply #2 on: April 28, 2015, 05:34:54 PM »
I have 1.69 low in trans.No info yet sorry. I had some guy name Parks tell me DO NOT get 1.80 go with 1.69 low. I lucked into a coan max duty aluminum carrier shorty shaft with 1.69 at less than half price and had 10 runs on it. Kind of seemed like fate.

More wheel speed with higher gear getting up on tire  and not as voilent is  what I took as reason. Heck what do I know I just listen to those who run fast and have lots of experiance with FEDs.
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline retroboy

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Re: 1.69 low gear
« Reply #3 on: April 28, 2015, 07:07:59 PM »
I chose a Torqueflite because it has 2.45/1.45/1.00 thinking the lower first gear combined with 4.56 rear gears will make my converter work better at multipling torque. I'm a hand brake guy have I made the wrong choice? I want a car I can drive.

Offline ricci32

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Re: 1.69 low gear
« Reply #4 on: April 28, 2015, 07:48:29 PM »
Bill brian  has run both and swears by the 1.69.

Offline Van

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Re: 1.69 low gear
« Reply #5 on: April 28, 2015, 09:45:09 PM »
I chose a Torqueflite because it has 2.45/1.45/1.00 thinking the lower first gear combined with 4.56 rear gears will make my converter work better at multipling torque. I'm a hand brake guy have I made the wrong choice? I want a car I can drive.

 I think of it this way, I run a 3 speed (T400) and run a 3.90 or even a 3.50 gear. With the low gear launch the converter is done doing its job right at the hit. The motor will stay in it's peek torque if you shift it right and the tall gear will give great MPH without buzzing the motor. You do not need a 4.56 gear or a killer converter with a 3 speed.   

Offline LZ

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Re: 1.69 low gear
« Reply #6 on: April 28, 2015, 09:51:38 PM »
Hi buds:
Say Can someone have anything to say about the starting line ratio for a FED?? Some generalities? Have talked and read some with people and they always relate to a heavier or suspended car. just thought this should go along with the talk here.
Here is a sample of info for conversations sake. Page 155 and 156.
https://books.google.com/books?id=SOIYFkfXdocC&pg=PA155&lpg=PA155&dq=starting+line+ratio+for+dragster&source=bl&ots=8IVq331lYu&sig=dwdICBWUpeXfLR0cIT2JzY2M2wA&hl=en&sa=X&ei=QV9AVcpLhMWiBOiugPgM&ved=0CC0Q6AEwAg#v=onepage&q=starting%20line%20ratio%20for%20dragster&f=false

I will be facing this whole issue when we dyno the engine. So thanks to everyone for sharing. 8)
Luke
"I am not a number.... I am a free man."

Offline afuelcoupe

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Re: 1.69 low gear
« Reply #7 on: April 28, 2015, 11:45:39 PM »
yes for you guys running decent power a 1.69 is the way to go but one important thing none of you have mentioned is that with the higher ratio your spit is much more favorable as well, this helps with your fuel curve as well as preventing the RPM  fall back on the converter........In fact some of you guys would benefit from an even higher first gear......one of the posts above mentioned it generates higher wheel speed.......That is not true with a shallower gear.....
just food for thought
« Last Edit: April 28, 2015, 11:48:17 PM by afuelcoupe »

Offline wideopen231

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Re: 1.69 low gear
« Reply #8 on: April 29, 2015, 11:07:00 AM »
Look at this way. Suspended RED's weight in 2000 lb area for most part. FED's in the 1400 to 1600(heavy) are. You need the tq multiplacation of lower gear(bigger number) to get the heavier car going ,but not so much with lite weight car.   
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline wideopen231

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Re: 1.69 low gear
« Reply #9 on: April 29, 2015, 11:17:38 AM »
Not saying 3 spd is wrong. It is lot heavier and lot more rotating mass.Some have been built under 100#. While there are lots of parts for3  spd's ,theres nowhere near the parts as for PG and well built pg can handle 2500 hp. As for rpm range. Glide will drop  plus or minus around 900 to 1000 rpm pretty narrow power band will be larger.

Need someone with racepak to post there stage,hit,shift rpm,fallback and time between leave and shift,Wouldbe great if someone had same info for 1.69 and 1.80.
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline masracingtd1167

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Re: 1.69 low gear
« Reply #10 on: April 29, 2015, 12:22:48 PM »
What I am thinking is to change the rear from a 4.56 to a 4.71 and put in the 1.69 low I think this would help my first half numbers .

Offline afuelcoupe

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Re: 1.69 low gear
« Reply #11 on: April 29, 2015, 12:50:15 PM »
thats not much of a starting line ratio change.......it takes you from an 8.02 to a 7.96 .........will help on the split though
what size and tire roll out are you using?

Offline masracingtd1167

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Re: 1.69 low gear
« Reply #12 on: April 29, 2015, 01:24:00 PM »
I run the 12x31 Goodyears .

Offline afuelcoupe

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Re: 1.69 low gear
« Reply #13 on: April 29, 2015, 05:08:25 PM »
thats only about 96 inch roll out .......is this an 1/8 mile set up or 1/4 set up? that is a very steep gear for 1/4 with only 96 inch roll out.....?what is RPM in the lights.I guess I would need to know alot more about your set up......

Offline masracingtd1167

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Re: 1.69 low gear
« Reply #14 on: April 30, 2015, 12:39:55 PM »
I run 1/4 mile . Right now I am crossing around 9000 but I think that's where my motor wants to be . I have never dynoed it but I think it is a little shy of 800 hp . Last time out I ran some high 7.20's at 183 .At some point I would like to run 7.0 pro with it so I am looking for a little more !