I have Bridgestone 245-45-18 on my 01 Gt Vert. My speedometer is messed up because of the bigger size. Ford tells me they can't recal. my computer for that tire size.(Whatever). So I guess a supertuner is my option I'm going to go for. Give me thoughts on the best one to by. It's a daily driver not going to the track but I still like to smell the smoke:&gt
Tires to big!!! WTF is ford smoking? A tuner has no problem recal. but a ford computer can't! Something is wrong with this picture.
Thanks

 

245-45/18's aren't that much bigger than stock(?) how "wrong" do you think your speedo is? What does the speedo show when you're driving an actual 50mph?