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Terence Bower

4.38:11 Diff in an 07 350z?

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Hi all,just been offered the above diff,anyone else done this please.I know the standard ratio is 4:5 but just how much of a difference will there be.Thanks in advance.

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Hi,

 

Are you talking final drive? If so think there's a slight error with the numbers. To my knowledge there is a 4.08 (or 4.1) and 4.36 available and the stock ratio is 3.5

 

Changing the final drive does make a big difference, I've just changed to a 3.9 and was quite surprised how much difference it has made, both to how you can work the gear box now to keep the engine on song and where the revs now sit cruising on motorway runs. On paper it doesn't look like much but in the real world it does. The 4.08 upwards I would reserve for a track only car as its a bit full on for an every day road car in my opinion but each to there own

 

I nicked this from the web..........gives you the idea

 

 

STOCK 3.538 Gear-- ECU REFLASH 3.538 ---HR Engine

6600 Rpm Redline -------7200 Rpm Redline-----------7500 Rpm Redline

 

First -----38mph ------First-----42mph-----------First-----43mph

Second ----62mph-------Second----68mph-----------Second----71mph

Third -----89mph-------Third ----97mph-----------Third----101mph

Forth ----114mph-------Forth----124mph-----------Forth----129mph

Fith -----144mph-------Fith-----158mph-----------Fith-----164mph

Sixth ----182mph-------Sixth----199mph-----------Sixth----207mph

 

No Reflash 3.9 Gear -- ECU REFLAH 3.9-----HR Engine

6600 Rpm Redline ----------7200 Rpm Redline-------7500 Rpm Redline

 

First ------35mph-------First ---38mph-----------First-----39mph

Second -----56mph-------Second---62mph-----------Second----64mph

Third ------81mph-------Third----88mph-----------Third-----92mph

Forth------103mph-------Forth---113mph-----------Forth----117mph

Fith-------131mph-------Fith----143mph-----------Fith-----149mph

Sixth------165mph-------Sixth---180mph-----------Sixth----188mph

 

 

No Reflash 4.083 Gear-- ECU REFLASH 4.083--HR Engine

6600 Rpm Redline ------------7200 Rpm Redline---------7500 Rpm Redline

 

First ------33mph--------First ---36mph----------First-----38mph

Second -----54mph--------Second---59mph----------Second----61mph

Third ------77mph--------Third ---84mph----------Third-----88mph

Forth ------99mph--------Forth---107mph----------Forth----112mph

Fith ------125mph--------Fith----137mph----------Fith-----142mph

Sixth -----158mph--------Sixth---172mph----------Sixth----179mph

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