Quote:
Originally Posted by QWKSNKE
yeah its very important to figure out your overall diameter and maintain it as close as possible when stepping up wheel size. Hell its even important when you go to a wider tire.
It (1.5" shorter tire) actually should have created a larger difference in his speedometer than what he is showing. I am ass'uming that either the FRPP tune is either wrong or is limited in what tire size values you can input and they just a size that was close to what he has on the car.
Ray,
89 Hoss no longer has the car that he installed the FRPP tune in but I don't think he had any major speedo issues. He ran a 275/40/18 on his car
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Correct ole great one! (future engineer!) 
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2007 SHELBY GT CSM073649
1992 Black on Black Vert lx 5.0
1985 Chevy c10 383 stroker
2000 Jeep Grand Cherokee 4.7 (daddy mobile)
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