What tire pressure do you guys with hoosiers run?
I didn't play with my tire pressure last time. I didn't wanna change anything on the car on the first track day. I did manage to spin all 4 hoosiers and cut a 1.95 60 foot thou. haha.
I wanna try again this weekend and just do tire pressure changes and then shift points after that.

A combo of tire pressure and track temp would be nice. Something thats already proven. For example: 20 psi - 70*, etc. Thanks in advance.

 

Good thread, can't wait to see some result's!

 

are you talking about the QTP bias plys or the DRs?
Also, wouldnt mind hearing what people that are cutting 1.4s runnin on both...

 

I run mine right around 18.5-20. I set them up cold for that. they heat up and gain about 2psi on me after a pass. so i guess im running them between 20-22. I also do a burn out. some will say that is low, but so far so good.

 

We tried a couple of pressures the one that worked the best was 18psi in front and 20psi in the back

 

10 in the front and 12 in the back.

 

You guys mind putting up what kind of 60 foot you were able to do and what temp the track was at the time?
Anyone drive with Hoosiers on the street?? Off topic

 

I've driven with them on the street and I feel perfectly safe, of course I've never tried to take a high speed turn with them for obvious reasons.

I had them at like 26psi, 2 step 7000, track temp 75, 60' 1.67... I need to play with the tire pressure a bit more.

 

I am changing in a range 12-15, depends on track surface, temperature and gut feeling 60 foot was 1.48 last year. Hoosier 26/8/15 drag slicks, no street use.

 

20 in the back. 22 in the front. 1.65seconds at night. Dont know the actual track temps though

 

In regards to these posts it may be a good idea to clarify what specific type of Hoosier tire your askign about

 

12 front
10 rear
1.61 60' not using 2step(no traction when I launch at 6k 2step)
still not getting the 60' I want. It was about 68 yesterday. My best 60' was launching off 2step around 4k. That was 1.58 I need to learn how to get this car to grip.

 

I think you are running to low of a tire pressure for the 17" Hoosiers...

10-14psi i think is for the 16" ones, the bias ply...

The Radials i see that people are getting good 60fts at 21-25psi....

The SHOP and Junior have two subarus in the 1.4 range with these tires... MAybe the Scoobies launch better but i am pretty sure the EVOs with some more test n tune can get similar 60fts...

 

I came in with 30 psi that morning. Kept dropping the pressure every couple of runs. I noticed a pressure increase of 2-3 psi after a run. I wasn't losing MPH but instead gaining so I kept it low. If it was a stickier track, maybe a higher pressure would work. This track Rockfalls has been known to have bad traction. Local guys call it Slippery falls.

 

A bracket racers best friend is his log book. Record temp, humidity, corrected altitude, tire pressure, and any other set up you change. If you don't have a weather station ask around lots of guys do.

I don't know if its the same for awd cars but in my drag car I set my tire pressures like this. Start high, around 15(Hooser drag slicks) then keep bringing it down until you feel the car start to "float". You will feel this happen after the 1/8 mile mark. When you get that bring it back up to the last good run you had.

Check your tire pressure before and after every run and log it in your book. Use a good analog or digital meter. A half psi can be the difference between getting the win light and going on the trailer.

Also don't just look at your 60' times. You might make a hundredth there but loose two on the top end if your tire pressure is to low. This is where your log book comes in handy. After a season you have a great deal of info to look back on. That helps give you a good base line every time you go racing.