4.1 final drive 0-60 times?
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Joined: Sep 2002
Posts: 214
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From: Scottsdale, AZ
I have the 3.91's in my 5AT Coupe & love them. I haven't done any 0-60 runs but city driving is much better. The tranny will act a bit weird with a 1/2 open throttle gear shift but the luanch is greatly increased. At WOT the car will literally jump off the line, it totally looses the lag that it had with the stock 3.36's.
Originally Posted by vodkarocket
I upgraded to the 3.5FD from my 3.3, and it is one of my favorite mods- the 3.9 seems a bit much for an automatic at least. It does however make driving pleasure a bit nicer since you're closer to the power zone in each gear, and you get ~8% more torque throughout the rev range...
I'm putting gears on my next car for sure.
I'm putting gears on my next car for sure.
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Joined: Sep 2002
Posts: 214
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From: Scottsdale, AZ
Originally Posted by bert039
What do you mean "act weird"? Are you talking about when you're driving in "D" or when you're shifting yourself?
Originally Posted by DaveB
That's not necessarily true. Deeper gears do not necessarily mean quicker ETs. If that was the case, then big block drag cars wouldn't be using 2-speed Powerglides and running 6s. Choosing the right gear depends on a lot of factors including:
1) Powerband
2) Tire height
3) Transmission gearing
4) Engine torque
It is quite possible to overgear a car and a 3.9 gear would do just that. Basically what will happen is the G35 will go too quickly through 1st and 2nd to give adequate acceleration. As for the 3.5 gear, I've tried it. I didn't have 3.5 gear in the diff, but I was running 23.5" drag radials which took my gearing from the stock 3.31 to a 3.55. On the same day, same track, the car WAS SLOWER with the 3.55 ratio. On average, it was .1 seconds and 2mph slower which was thanks in part to the early shift into 4th a few hundred feet short of the finish line. When the car his 4th, it just layed over. With the 26.2" stock height 17s, I am able to hold 3rd right until the finish or approximately 101mph.
1) Powerband
2) Tire height
3) Transmission gearing
4) Engine torque
It is quite possible to overgear a car and a 3.9 gear would do just that. Basically what will happen is the G35 will go too quickly through 1st and 2nd to give adequate acceleration. As for the 3.5 gear, I've tried it. I didn't have 3.5 gear in the diff, but I was running 23.5" drag radials which took my gearing from the stock 3.31 to a 3.55. On the same day, same track, the car WAS SLOWER with the 3.55 ratio. On average, it was .1 seconds and 2mph slower which was thanks in part to the early shift into 4th a few hundred feet short of the finish line. When the car his 4th, it just layed over. With the 26.2" stock height 17s, I am able to hold 3rd right until the finish or approximately 101mph.
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Joined: May 2006
Posts: 322
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From: Sugar Land, TX
Originally Posted by DaveB
It is quite possible to overgear a car and a 3.9 gear would do just that. Basically what will happen is the G35 will go too quickly through 1st and 2nd to give adequate acceleration. As for the 3.5 gear, I've tried it. I didn't have 3.5 gear in the diff, but I was running 23.5" drag radials which took my gearing from the stock 3.31 to a 3.55. On the same day, same track, the car WAS SLOWER with the 3.55 ratio. On average, it was .1 seconds and 2mph slower which was thanks in part to the early shift into 4th a few hundred feet short of the finish line. When the car his 4th, it just layed over. With the 26.2" stock height 17s, I am able to hold 3rd right until the finish or approximately 101mph.
Originally Posted by rlwjr1
What was your 60' time on the 23.5" tire vs. the 26.2" tire? What was the weather like on the two runs?
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