We're going to the drag strip next Friday, what are you guys running for tire pressure on 245/50-16s? The tires are Kumho Ecsta ASX's if that matters. On normal street driving I am running 35 PSI, as indicated on the door. Should I drop the rear down to 30 PSI?

My brother has a '95 Z28 with 275/40-17s on it, what pressure should he be running? They are BF Goodrich KDWS of some sort.

 

Believe it or not (your choice) start out a little higher than you normally run on the street. Then work your way down and see if it helps or hurts.

 

I wouldn't go under 26-27psi. A normal street tire has a stiff or semi stiff sidewall for handeling purposes. The sidewall is not going to 'wrinkle" like a dr or slick. Start at 35 and go down, avoid the waterbox and do a quick "clean the tires burnout". A street tire isn't going to benefit from a long burnout.

 

I've cut 60' times as good as 1.92 with street tires pumped to ~35-36 psi, and as bad as ~2.3's with the tires deflated to ~25 psi .

I'm not sure if the 17's take about the same pressure or not though? (probably? )

 

street tires suck. I started mine at 30 and by the end of the day I had the psi at 20 they were doing really good at 20 but I was killing my tires.

drag radials

 

It really depends on the tire. I had played with the pressure on my stock Goodyears and it didn't seem to matter what I did. My best time was at the street pressure(32psi). I put my Toyos on after burning off the Goodyears and my best time was actually dropping the pressure to 20psi and doing a pretty long burnout. Rubber compounds vary between tires so it's a matter of figuring out what works best for your car.

 

I normally had mine at 24 I was getting 1.9 60s on BFG 245 45 17 comp TAs