what psi should they be set for, my dad got a set for his 77 trans am , he has 15x8 ' s and he wants to know what they should be set too. DOes anyone have a comparos between slicks and drag radials and street tires.

 

come on, no one has them .

 

i think i got my best 60' with 18 lbs in my 255/50/16

 

I have seen some guys run them as low as 15 lbs. Best thing for him to do is go to the track w/ them set at 25-30 lbs and then lower the pressure until he feels they hook the best. Its really a trial and error issue each time you head to the track. Depending on how its prepped and the track temp etc, each time you go it could be a differnt PSI.

 

so many factors play into that it's all trial and error. not to mention weather, time of year, etc. that no one specific pressure works better then the next. his burnout time will also change how it effects the setup. i'm running them on my 18's but obviously my pressure varies. try searching some of the racing forums.

 

On the street I run them at 32-34 psi. On the track I air them down to 16-18psi. I've a cut a 1.62 60ft on them ... with no slippage. They will definitely hold a 1.5x on my setup.

The key to using these tires is to treat them like a slick at the track. Heat those babies up good and make sure smoke is rolling from both tires. Here's my 1.62 ...

http://www.celligent.com/tim/iroc/movies/track.wmv

Tim

 

thanks for the info and the movie.

 

Sweet IROC dude....how much is it puttin out?

 

I believe i was running around14-15 Psi in mine when i ran a 1.69 short time. But like Chris89GTA says, you'll have to start high and work your way down a lb or 2 at a run

 

Enough to run 11.6's @ 117mph. Not sure what that works out to be. Maybe ~390 to the rear wheels. Who knows.

Tim

 

i had the 255/50/16's on my rs last year, ran 14 psi in each tire and ran a best 60' of 1.512