hey ya'll

I have a 2.3 liter with a HTA 3582r turbo.

this next time I will hopefully make around 600 on Buschur's mustang dyno.

I've been thinking about going with a 4.11 final drive ratio and havent seen a whole lotta info on these boards about them I know the jist of it

I know the main Positive is that you Do not have to switch into 5th on the quarter mile. but are there any negatives of it??

Will a 4.11 decreas acceleration???, will it decreas low end power and spool up?

those are just a few questions I have.

ANY info you have on this subject would be great. I just simply want to know the positive AND the negative effects of a 4.11 final drive ratio.

BTW my car is a weekend warrior that goes to the quarter mile prolly 5 times per year....I am not worried about gas mileage

thanks for ya'lls interest,

John

 

bump for answers to the questions plz

 

Yes it will slow acceleration, but I have seen DB previously saying that he changed to a 4.11 and noticed no change in ET/MPH

 

wonder if it's worth it to ugrade???....wonder how much it slows acceleration?

 

I have a 4.11 and if anything it felt like it made my acceleration even harder but thats just me. I'm not sure how it will act with an upgraded turbo but I can let you know when my car comes back from Buschur. I see that you have a 2.3 if thats the case you should think about the 3.73 instead I have a buddy with a 2.3, T67 and the 3.73 and he loves it.

 

I have the 4.11 in my ride and I love it but then again I run around with 40+ psi

 

but theoretically a 4.11 should actually hurt acceleration right???

how would a 3.73 compare to the 4.11 gear ratio???

 

To tell you the truth I dont really know. I do know that a raced a 35r evo back when I was on my 6speed and pulled him a couple cars. Then I raced the same exact car when I get my 5 speed put in with the 4.11 and pull him by the same amount but my motor was messed up with low compression on 2 cylinders but it was in good health when I raced him in the 6 speed. So I do think the gearing makes a huge differece. About the 3.73 its a TON longer than the 4.11. My buddies car can go 160 in 4th gear. If you have the extra torque of the 2.3 I would go with the 3.73 instead of the 4.11.

 

subscribed for more info :]

 

Are you talking about Nick Andy's car. I remember him saying that he can pull 4th to 160mph on the 2.3

I would think that it would technically hurt accelleration. But it would load the motor sooner due to less TQ multiplicatiion in the gearing so in hence it may help spool the turbo sooner. Plus you have higher displacement that may offset the loss , if theres any at all.

I am no expert just my logic , haha so take it for what its worth

 

All things equal, a lower final drive will slow your acceleration but help the top end. If you're running a lot of boost, it's possible the "slower acceleration" will give the boost more time to build which would actually offset that part while still having better top end.

 

thanks for all of the replies, I still havent decided if I'll do this 4.11 gear or not. I spoke with John Shepherd very briefly about it, and he said anytime you use a taller gear it will slow down acceleration.

I havent really asked anymore questions about it yet but I plan too

see, the onlytime I really go high speeds is on the quarter mile, the rest of the time on the streets acceleration is what I love! love those quick 2nd and 3rd gear pulls lol Jus don't want to hurt the car much as in acceleration.

 

https://www.evolutionm.net/forums/at...-evoratios.zip

Extract the file and rename to a .rar. Then unrar. It's an excel spreadsheet that shows all of the data for the Evo trannies and you can change the final drive to see how the speeds, etc change.

 

I too would like to have a stroker but I don't want to run out of 4th in the quarter. If the 4.11 FD will remedy this it might be worth it. Bump for more input.

 

Yes, the 4.11 would definetly remedy this, BUT it might have some negative effects on acceleration also...