Hopen4low12s

i got 26x11.50 r17 and i have tried from 16-19 so far at the track with my 05 mustang GT ive got 3.73 gears 4000 - 4500 rpm launches i need some help with psi is there a website with a ratio?? like weight to power and thingS??

JD1969

Trial and error man, you might even need to change pressure as the day goes on and the track changes. I start at 20 psi and drop them untill the 60 foot falls off, but every car is different. BTW you don't want to go too low or they will cup.

grabbem88

that and might spin off the bead too.


i was launching from off idle to 4k till i found a sweat spot...that's why they call it test,and tune.

get a buddy to tape you also...it might feel good in the car,but outside it might look like you need to make changes.

uedlose

I found 12 psi works best for us and most of the guys we run with if your tires are new it will take around 10+ runs for them to start working good anway.

Grimace5.0

And not some dillweed thats going to say "you spun the tires...cool!" Somebody that can actually watch whats going on and tell you what happened during the launch.

wildcobrar

I agree with trying the 20 psi deal and backing off the pressure untill you find the sweet spot for sixty foot times.