4.08 or 3.90 gear questions...

6MT

I was wondering when zatzuma would chime in on this thread. He tried the 4.08's. His results were: first gear was useless. Second was better, but pretty hard from a stop to start in 2nd. He changed it back to stock after a short time.

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Andrew

2009 370Z Sport/Touring 6MT sold
2013 Honda Civic Si coupe D/D

BrianMSmith

Oh, and in my Camaro (post above), with the 4.11s the gearing was similar to the stock MT6 Z between rpm and speed. So in the Camaro 1st gear was still usable for normal driving, but I would never use more than half throttle, just too violent and too easy to spin. In the Z, I agree that 1st gear will be useless with the 4.08s, you'll never need it.

Zat_Zuma

Not quite. I changed it over to the 3.9 gearset (5% increase)

Like it much better for all around driving. 1'st gear is out of RPM in 2 sec or less at full throttle. The 4.08's ran out of RPM even faster! It's no fun bouncing off the rev limiter that quickly.

Now that I've used the 3.9 gears for awhile, it seems normal for me to shift to second almost immediately after accelerating from a stop.

The rev matching (SRM) is a lot closer with the 3.9's vs the 4.08's.

In retrospect, I would have left the 3.7 gearset in with the supercharger as I'm always loosing traction in the first two gears at full throttle.

But in 3'rd and 4'th gears and the SC the acceleration is fantastic ...... right wheee!?

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[B]2009 & 2017 370Z Touring Sport Autos SOLD

Blakestyle521

Trying to decide which final drive would be best. I have a bone stock 09 370 nismo, that i plan on boosting with the gtm TT kit. This kit alone will give me approx 500whp. However, i want to do gears first. Any thoughts on this delema?

Tickwomp

FWIW, I'd have the shim kit on hand before starting the swap. It's faily inexpensive, but absolutely vital if you need it. If you don't need or use it, you take it back. If you need it, you could possible find yourself with downtime tracking the shim kit down.