Installed a RPM differential

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Jul 18, 2010 | 05:30 PM

baxterboy

Thread Starter

Instructor

Joined: Jan 2010

Posts: 239

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From: Vancouver Island British Columbia

Installed a RPM differential

I installed a 3.42 differential in my 2008 s/c C6 A6 vette. Got a (efi live based) tranny tune from ECS and tranny shifts great. Only problem is that the speedo is out to lunch. I tried with EFI live to switch the speedo calibrations but when I put in my tire size, final gear ratio (3.42) the check engine light and speedo was out a pile more (showed me going 30 MPH pulling out of the driveway). Any advise on how to get my speedo close to accurate? My car is an automatic. Looking at the tune file it shows final gear ratio of 3.42 but all the other values are the same as my 2.56 tune (IE sensor, revolution, Ect.)

Jul 18, 2010 | 05:39 PM

RicK T

Team Owner

Joined: Sep 2005

Posts: 20,352

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From: Ventura County, Calif

Don't have an answer for you. You might want to also ask over in the Scan and Tune Forum. Might be someone over there who knows what's going on. Good luck.

Jul 18, 2010 | 08:47 PM

EuroRod

Race Director

Joined: Jan 2006

Posts: 18,396

Likes: 169

RPM should have an answer I'd think?

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