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      04-04-2013, 09:39 PM   #1
jra85
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Drives: 2011 E92 M3 ZCP
Join Date: May 2010
Location: Long Island, NY

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Speedometer/Odometer Error Correction

I recently went to a 275/30 and 295/30 setup on my E92 ZCP which are slightly less tall than the stock 245/35 and 265/35 setup. This has the effect of increasing speedometer error by about 6% over the reported iPhone GPS speed. Is it possible to code/calibrate the speedometer to these shorter diameter tires to make both the speedometer and odometer more accurate?

Thanks!