Will I need a new tune??

[Jackpine]

Originally Posted by 97xl

I know I can't adjust the speedo with the programmer, needs to be done by swapping out the VSS gear. Just wondering if I'll need a new tune to make the shift points correct. Last thing I wanna do is go messing with the shifts in the programmer and make things worse. It should be liveable until I can get new tunes. Right now the speedo gear is set for stock tire size of 235/70r16 and since my winters are 255 and summers are 265 it was already off to begin with but that didn't seem to make a difference with the tune(when I had the tune made I put 255s as the tire size on Troyers order form.) Guess I'll just wait till PHP is open again and find out the details.

Thanks for the info.

Thanks for reminding me of the name. If the VSS gear makes your speed correct, then the shift points should also be correct. I'd say install a VSS, with the new gears, that matches the tires you use most of the time and live with the slight error that will be present with the others. Looks to me like you'll have only a 2% error between the 255s and the 265s.

- Jack