Quote:
Originally Posted by 62nalide
So in theory 3.45 gears would be a better ratio for us A6 guys?
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Ideally, since even with 3.27s, you have to get in 4th gear; youd want a gear/tire combo that would allow you to cross the traps at the top of 4th. Of course you need to know about what trap speed to calculate for and also what rpm you are peaking power at. That's why Ive said for a long time that you need to be able to spin 7000 rpms to consider 3.91s on a cammed auto car. With a 1.15 4th, we need a little less gear because of the aggressive trans gearing.
3.91s are probably too much for a bolt on car, will likely have to hit 5th before the traps, IF the combo is making the power it should be.
Id say 3.45s and a 27" tire, or 3.70s and a 28", or stock gears on a 25.5-26" tire will be about the best gearing for a bolt on car.
Forced induction and nitrous, really you don't need any more gear than a 3.45.
Cammed, Id say most setups will like a 3.91/28" combo, or 3.70 with a 27" tire, or 3.45s with a 26".
Just my .02!
I cross at 126-127 on motor at 6900rpms with converter locked in 4th with 3.91s and a 28" slick.
I have to go into 5th on the spray....
. I know I could go 1-2 tenths quicker on spray with a 3.45. But I don't want slow it down on motor!!