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Speedometer Error?

701 Views 0 Replies 0 Participants Last post by  Rudy
My speedometer appears to read ~15% too low. For example, when the speedometer indicates 55 mph, I am actually going close to 65, and when it shows 80, I am flying past traffic doing about 95 mph. This error has been verified by pacing with friends' cars.

The vehicle in question is a 93.5 Supra TT with auto transmission. It rides on stock size Enkei RP01s with 235/45 front and 275/40 rear. I know going to different profile tires makes a difference, but it shouldn't be so dramatic.

How can I recalibrate the speedo?

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