RX8Club.com - I need 3.90 or 4.10 rear diff

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Mazmart

11-25-2008 01:10 PM

Quote:

Originally Posted by morkusyambo (Post 2740795)

Anybody know what rpm the car would be at with these different diff. ratios @70mph??

What about max speed in 2nd and 3rd gear??

For the difference between rpms at a given speed between 4.44 and 3.9 multiply your current rpm by .8773. That would be rather accurate.

Paul.

nmarz77

11-25-2008 01:30 PM

Shouldn't that be .8783? Actually .8784 if you round the last digit up? j/k Close enough.

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