cjb7804

Heading to the strip on Sunday again, and wondering what you guys running street tires are running for psi. I was going to drop down to about 20psi. I ran a few weeks ago and forgot to air down (was at 33psi), but still ran a 13.626 and spun pretty bad, so I'm hoping it will bring my 60' times down and help my overall ET. What do you guys think?

GT Bob

When I was on stockers, I put the down to like 22 psi when the tires were cold, 24-25 when hot. Seemed to work best for me. Also reeber, every .1 in the 60' time is .2 at the traps.

2007VistaBlueGT

I run mine at 25psi

white07

I think I read somewhere someone actually ran quicker 60fts with aired up tires. I used to run my street tires at 30psi. 2.1 and 2.2 60s.

cjb7804

I was running 2.1 60' untill my last run and thats when i had a 2.4. Track got pretty warm and I could feel it spin into my third gear. I was hoping for a little more traction at the start, but I know lower air pressure is more rolling resistance, so I'm not for sure it that will hurt me further down the track. GT Bob, my dad was figuring that 21-22 psi would be pretty close too. It's a 2 hour drive to the track for me, so the tires will be somewhat warm by the time i get my qualifying runs in, so the 22psi might be a bingo for me.

cjb7804

Well headed for the track around 5:30 this morning and got my tech done. Me and my dad found some slicks from another guy that wasn't running them today, so he said that I could use them if the fit. Put them on and needed about a 3/8" spacer so they wouldn't hit the side of my caliper. Oh well, they said I can use them next time. Anyway, ended up airing down to about 20psi and about that time they called for the Sportsman class to line up, so me and my dad got lined up and went for our first qualifying run. I ended up getting a good reaction time (which would have put me in the top 10 for qualifying), but by 60' was still at 2.1. About 4 cars after us, someone blew their engine and oiled the track, well in the mist of all this the wind was blowing about 45mph (which explains my slower times) so they ended up calling the races because it was blowing dust allover the track. So I didn't get a good chance to really see how much it improved, but there will be more days.

GT Bob

Just be careful going too low also. Not enough pressure and you can actually spin it on the bead, popping it. It can also cause too much shock to the sidewall and actually cause the tire to unload as well. I would use 20 as the lowest starting point and go up from there.

tx_zstang

I used to run the stock Pirellis at the track, and they would grip better at around 20-22; above 24 they would just spin.
But run them as high as you can without spinning too much or losing traction.