what's considered the best tire pressure for going over 100mph. i know theres a certain psi to put it at for less shaking etc.

 

i would be concerned with the speeding rating on your tires and there should be a sticker in your door jam that tell you how much pressure for the front and rear tires this will give you best handleing

 

start with stock tire pressure. then play a little. more tire pressure up front will increase understeer. which is good because oversteer is a common problem with rear wheel drive cars. its not a huge difference in pressure between the tires though. maybe 32 up front and 30 in back.

 

Depends on the tire. Whatever you have you need to go by its speed rating and find a happy medium between the max pressure and the stock tire inflation rate. When you get into the (Max 44 psi) tires over the usual stock 35 psi tires you will have to know what the vehicle weight with driver is and tune to your liking with about 40 psi and go from there.

 

I run about 20 all the time in mine..but I ahve MT ET streets..and a lot of my buddys pull up next to me at a stop light lol..but 15-20..I spin a little on spray and have 1.8s for 60 fts