Quote:
Originally Posted by kevin.z
What is the rationale for 3.54 gear? why didnt u go for the NA-optimal 4.08 drive? Any butt dyno gains?
thanks!
kev
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Biggest reason was to lengthen the time between shifts. Final drive won't change the HP/TQ ratings of the car it either reduces/increases time in/out of powerband.
**EDIT** This is based on what I know about how the final drive works. If someone knows more about the mathematical specifics, I'm all ears.
The OE 3.69 got me into my powerband quick but that's not so good for me since I deal with a TON of traffic. So I'm usually sitting in 1st a lot.
A 4.08 would shorten that up even more. It's great if you want quick acceleration but you'll be sitting at much higher RPM at 75MPH in 6th. I am usually hovering around 2500-2600RPM for 75MPH in 6th which is only the beginning of the powerband.
Also I do plan on going FI with my car so lengthening my gears will be nice when dealing with immense power.
As for the "butt dyno", I have to say my car now is deceptively fast. I say this because the MPH creeps up on you quick and you don't even notice it. Though what's nice is once I'm around 2500RPM, I can still pull pretty good because of the "less work to do more" gearing.
I forgot to mention in my OP but my car presently has a CEL and needs a tune. That'll be done this coming Tuesday so I'll be updating the speed info.