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Just from switching from the stock Sport setup to 275/35 on 18s, I get a ~5-7 mph difference between GPS and the speedometer in the ~80-130-ish mph range (speedo reads
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09-11-2014, 11:38 PM
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#26 (permalink) |
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A True Z Fanatic
 
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3596   |
Just from switching from the stock Sport setup to 275/35 on 18s, I get a ~5-7 mph difference between GPS and the speedometer in the ~80-130-ish mph range (speedo reads high). I'm surprised UpRev hasn't offered a correction for rear end ratio and tire circumference like many programmers do on other cars. Perhaps there's some limitation in the stock ECU itself that's difficult to work around?
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