7AT 3.692 Gear Review

xavier

Hi,

Thank for anwers.
Sorry for my english...
For more information.
I have 370z 7AT limited slip EU, with (OEM 47/14) 3.357 final drive on the car. . there are cooling fin under pumpkin. No cooling fin on cover.with 48 teeth on ABS flange. I have no problem. My only problem, LSD are to much dangerous and Quaife are much more better.

I have old pumpkin 350z, 46/13 = 3.538 with Quaife (QDF13L) , 46 teeth on ABS flange. There are cooling fin under pumpkin and on cover.it is 5.4% final drive better than 7AT. with 46 teeth on ABS flange, making 4.3% less teeth than 370z. from I understand, the ECU will see 5.4/4.3= 1% wheel speed less.

EU pumpkin is littel bit different than US. It change under with cooling fin.

I don’t want to ECU flash. At first, I was not understand how EcuTek running. I was thinking to OBDII key EcuTek permit to unloock some car limits ( if the OBDII key EcuTek stay in OBD car). But, it is not, it is true ECU flash.

I need to keep outside 7AT pumpkin original aspect. With cooling fin under pumpkin. No cooling fin on cover.

i have read lot of post about to change final drive other than 3.357 on 7AT. There are some problem with Cruise control. But, for me, it means, in bad driving situation, i will not have full ABS and ESP performance. Only bad situation will permit to see a problem, but it will be to late during bad situation.
To use my Quaife will need 2 x 370z flange and cover wihtout cooling fin aspect.

I have 3 solutions. To use :
-my 350z Quaife 3.538 with 350z flanges
- my 350z Quaife 3.538 with 370z flanges
-to buy Quaife QDF18L with 370z 7AT pumpkin. with 370z flanges. The best for no problem with ABS, ESP, cruise control, "downshift rev matching" …

-my 350z Quaife 3.538 with 350z flanges
From i understand, ECU will see 5.4/4.3= 1% of difference on wheel. But i don’t know the disturbance
for ABS and ESP, cuise control and "downshift rev matching" . torque converter clutch accept arround 5% yield sliding. i think "downshift rev matching" will be full ok. But , there are difference between front wheel and rear wheel ABS, and ESP performance.
What will happen for "downshift rev matching", ABS, ESP and cuise control ?

- my 350z Quaife 3.538 with 370z flanges
What the 370z flanges will change about ABS, ESP and "downshift rev matching" , Cruise control problem performance?

- 370z 7AT ,47/14, 48 teeth ABS pumpkin with Quaife QDF18L.
All will run, but no more performance… but fully safety

i don't know if ABS, ESP, "downshift rev matching" and Cruise control will
run for perfect and will accept some yield sliding.

if you have any council... but i think, i will sale my 350z Quaife 3.538, and i will buy 370z 7AT ,47/14, 48 teeth ABS pumpkin with Quaife QDF18L...

Thanks
Xavier