4.08 or 3.90 gear questions...

Zat_Zuma · 11-24-2011, 02:33 PM

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!?

Quote:

Originally Posted by 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.

Blakestyle521 · 01-06-2012, 07:28 PM

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 · 01-07-2012, 11:33 AM

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.

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01-06-2012, 07:28 PM	#2 (permalink)
Blakestyle521 Base Member Join Date: Jun 2010 Location: SLC Utah Posts: 9 Drives: 04WRX01durama09nismo Rep Power: 17	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?

01-07-2012, 11:33 AM	#3 (permalink)
Tickwomp Base Member Join Date: Dec 2011 Location: Plano Texas Posts: 73 Drives: 2010 370Z Nismo Rep Power: 15	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.