Brent 930

Need to know if a R&P will fool me in thinking that I'm going a certain speed when I'm really going faster? If so what is done to compensate for this change?

Thanks,
Brent

jhunt@huntinter

No effect

Brent 930

Thanks John, I know you have the R&P and sure you have checked this out on the street or when you dynoed your car.

Brent

jhunt@huntinter

Brent, FWIW the speedo on my car reads 5mph fast, always has and may help explain why I've had no tickets in her

Gino

I do believe, though, the speedo is affected by tire diameter and that may explain the 5mph difference.
That's been my experience as I'm running 245-45-16, which have an overall diameter of 24.6". I think that may be different from the original tire equipment. I've seen diameters (TireRack.Com) for the same size tire vary from 24.8" to 24.3", which changes the tire rotation-per-mile from a high of 858 to as low as 839 revolutions. That would definitely affect a speedo.