Question about 2002 Porsche 911

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My speedometer on my car reads fast how can fix the problem the tires are org

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Most cars are designed to be overoptimistic by about 5-10%, this heps to keep the speeding fines less. If you want to calibrate it, your Porsche dealer should be able to refer you to a reputable supplier / dealer in car electronics. It shouldn't cost more than about 250 dollars to do - and you get a dyno print-out to boot!

Posted on Jun 18, 2009

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Yes, you'll be o.k. They don't recommend anything over 3% difference, and your at about 1.8%. Speedo will read 61 mph when actually doing 60 mph. Have a look.

Stock Tire - 215/60R16 >Search Tires Tire 1 - 205/60R16 >Search Tires Section Width: 8.46 in 215 mm Section Width: 8.07 in 205 mm Rim Diameter: 16 in 406.4 mm Rim Diameter: 16 in 406.4 mm Rim Width Range: 5.5 - 8.5 in Rim Width Range: 5.5 - 7.5 in Overall Diameter: 26.15 in 664.21 mm Overall Diameter: 25.68 in 652.27 mm Sidewall Height: 5.07 in 128.77 mm Sidewall Height: 4.84 in 122.93 mm Radius: 13.07 in 331.97 mm Radius: 12.84 in 326.13 mm Circumference: 82.15 in 2086.6 mm Circumference: 80.67 in 2049.0 mm Revs per Mile: 795.4 Revs per Mile: 809.9 Actual Speed: 60 mph 100 km/h Speedometer1: 61.0 mph 101. km/h Speedometer Difference: - Speedometer Difference: 1.822% too fast Diameter Difference: - Diameter Difference: 1.8%

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