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Join Date:May 2006Posts:22
Big drag radial tire result in lot of traction but create a problem
I have a C7 z06 a8 2015 car. For maximum traction when drag racing, I have install 30.2" drag radial at rear and 26" skinnies on front. I use 18 inch wheel. The car has so much traction at starting line it lift front wheel by 1 inch. I did reprogram speedo and trans with HP tuner but when I drive this car in the street over 60 MPH the computer send this message. SERVICE REAR AXEL All warning light comme on (engine abs,traction control, stability track). Transmission is not shifting well 1-2 and 2-3. I think there is too much difference betwen rear and front tire size and VSS and ABS sensors have too much difference in readings. Speedo is reading right speed when I compare with GPS speed. Do you know a way to adjust TCM so speed of driven and undriven wheel will match ?
Please help me.