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Originally Posted by ssqpolo some1 should do it to the 370 You? I'm starting to really think about just moving mine up to the 6MT's rear end (3.692 instead of
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04-29-2009, 11:22 PM
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#1 (permalink) | |
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A True Z Fanatic
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3595   |
Quote:
 I'm starting to really think about just moving mine up to the 6MT's rear end (3.692 instead of 3.357 that came with my 7AT). I need to go run the numbers again and think about high-speed RPMs more though (that, and wait for a programmer like UpRev that can tell the ECU about it too).Edit: 7th gear on a stock 7AT setup with stock Sport wheels/tires is approximately 32.78 revs/mph. Swapping in the 6MT's rear end would put it at about 36.04 revs/mph. This is what the revs would look like with the two options, cruising in 7th on a very long track: mph | rpm | rpm 100 | 3278 | 3604 110 | 3606 | 3964 120 | 3934 | 4325 130 | 4261 | 4685 140 | 4589 | 5046 150 | 4917 | 5406 In the lower 100's it's not too bad a difference. Even at 150mph it's only 500rpm. Hmmmm.... Last edited by wstar; 04-29-2009 at 11:33 PM. |
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08-05-2009, 10:46 AM
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#2 (permalink) | |
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Base Member
Join Date: Apr 2009
Location: Chile
Posts: 20
Drives: 370Z 7AT Touring
Rep Power: 17 |
Quote:
Maybe i'm wrong but... I do not see the reason to advise the ECU. If you call a gear downshifting, ECU-tranny will give you it anyway, just checking the RPM, not speed... Or I'm wrong? Anyone has experience with changing ratio in AT (infiniti, 350Z etc)? Bye! |
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08-05-2009, 11:14 AM
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#3 (permalink) | |
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3595 |
Quote:
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08-05-2009, 11:22 AM
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#4 (permalink) |
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3595 |
Oh and as far as upgrading the rear end ratio in the 7AT, aside from spacing out all the cash I'm throwing down, and having to consider whether I want to get rid of VLSD while I'm at it (perhaps the 1.5-way Carbonetic that Mike@DDM likes so much), the other thing holding me back is I'm not sure if it will make 1st gear too short. The 1st gear ratio on the 7AT is way out there compared to the 6MT. In stock form on the sports model, 1st gear ends at about 36mph @7500rpm.
My tire/wheel upgrades that are coming soon (moving to 295/30R18 in the rear) already drop that number a bit, and when I ran the numbers, the combined effect of the tire/wheel change and moving to 3.692 in the rear would put 1st gear topping out at more like 30mph @7500pm. 1st gear already ends so quickly that it makes timing the 1->2 upshift optimally challenging, so I'm worried this will make it insane. On the other hand a higher redline from the ECU stuff would offset this a little. We'll see what happens when I get to all this I guess. |
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