Nissan 370Z Forum

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-   -   4.08 Frontier gear swap (http://www.the370z.com/engine-drivetrain/18209-4-08-frontier-gear-swap.html)

jnaut 10-05-2011 10:04 PM

Aggie you have a pm

One_Quick_Z 10-11-2011 12:03 AM

Anyone do this to the 7AT yet? I really havent seen anyting about it with the auto tranny...



DAN

oreoleo 10-11-2011 12:45 AM

Im considering shipping my diff and gears to a specialist - since i have been unable to find someone good around philadelphia. any suggestions around the east coast?

gbrettin 10-12-2011 03:36 PM

I'm interested in doing this on my 7AT too. Information on that would be helpful.

THanks

T_K 10-12-2011 08:26 PM

Quote:

Originally Posted by gbrettin (Post 1355282)
I'm interested in doing this on my 7AT too. Information on that would be helpful.

THanks

7AT
4.924
3.194
2.043
1.412
1.000
0.862
0.771
3.357 (Final Drive)

6MT
3.794
2.324
1.624
1.271
1.000
0.794
3.692 (Final Drive)

Multiply gears by FD.

7AT
16.530
10.722
6.859
4.740
3.357
2.894
2.588

6MT
14.007
8.580
5.996
4.693
3.692
2.931

6MT (w/ 4.083 FD)
15.491
9.562
6.631
5.189
4.083
3.241

Now look at 7AT vs 6MT w/4.083:
7AT 6MT
16.530 15.491
10.722 9.562
6.859 6.631

4.740 5.189
3.357 4.083
2.894 3.241
2.588

The first 3 gears in a 7AT w/ OEM FD is geared more aggressively than a 6MT even with a 4.083 gear. The top 3 gears favor the 6MT, even without a final drive, the gears are closer. Up to 3rd gear the numerical values favor the 7AT, but the 6MT spans the 4-6 in what the 7AT spans with just 4-5.

Dustin@Z1 10-12-2011 08:36 PM

I realize I am a little late on this...but regardless.
 
Quote:

Originally Posted by AggieAv8r (Post 1296350)
Actually it doesn't - you have to order both kits from them and pay way too much for them.

I got everything needed for $660 shipped. Buy from them and you'll pay $900+ with shipping.

:tiphat:

I will look into our pricing. I attempt to keep our prices as competitive as possible. Thanks for the heads up though. I know it may not benefit you directly, but any comments about this and future price concerns. Please feel free to shoot me a PM, I am always willing to double check prices on our website (bc they do change from time to time) and will work to the best to my ability to price match whenever possible.

b1adesofcha0s 10-12-2011 08:38 PM

Quote:

Originally Posted by One_Quick_Z (Post 1352517)
Anyone do this to the 7AT yet? I really havent seen anyting about it with the auto tranny...



DAN

Z_eliminator has it done on a 7AT :tup:

Methodical4u 10-12-2011 09:01 PM

so for those with the M/T does the sychro rev match still work the same?

esfourteen 10-12-2011 09:14 PM

Quote:

Originally Posted by Methodical4u (Post 1355873)
so for those with the M/T does the sychro rev match still work the same?

if you bothered to read or search the thread you would know that SRM is off by a few hundred RPM as the system is pre-calculated with the factory final drive. With the stock clutch its not very noticeable at all and you wont have any problems*, with a stiffer aftermarket clutch you will likely be so annoyed that you disable it.

*the one issue is going over ~130MPH will cause SRM warning's to appear and the system will disable itself until you turn off the car.

Methodical4u 10-12-2011 09:37 PM

Quote:

Originally Posted by esfourteen (Post 1355904)
if you bothered to read or search the thread you would know that SRM is off by a few hundred RPM as the system is pre-calculated with the factory final drive. With the stock clutch its not very noticeable at all and you wont have any problems*, with a stiffer aftermarket clutch you will likely be so annoyed that you disable it.

*the one issue is going over ~130MPH will cause SRM warning's to appear and the system will disable itself until you turn off the car.

well, I didn't bother to search through the forum... thank you for the answer however.

b1adesofcha0s 10-12-2011 09:37 PM

Quote:

Originally Posted by Methodical4u (Post 1355950)
well, I didn't bother to search through the forum... thank you for the answer however.

Actually it was in the earlier part of this thread....

Methodical4u 10-12-2011 10:36 PM

Quote:

Originally Posted by b1adesofcha0s (Post 1355954)
Actually it was in the earlier part of this thread....

I had just seen on a forum before that it affected the SRM, so I didn't even bother to consider it as a mod.

B.A.Q 10-13-2011 04:50 AM

Quote:

Originally Posted by Methodical4u (Post 1356059)
I had just seen on a forum before that it affected the SRM, so I didn't even bother to consider it as a mod.

not with a lot as I read before. it's is the most noticeable mod for an NA though

oro 10-13-2011 10:02 AM

Quote:

Originally Posted by B.A.Q (Post 1356237)
not with a lot as I read before. it's is the most noticeable mod for an NA though

Little OT here BAQ but how is your experience coupling the Quaife with the 4.08's?

jdonadio 10-22-2011 01:59 PM

4.08 gears for AT
 
Has anyone does this on an AT, and where can you find them?


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