What effect does changing the tire presure in your front/rear tires have on handeling of the car?
For intance, what range provides maximum grip (if recomended presure is 32 psi I'm guessing that would be best)?

And also, could you invoke some overstear/understear by changing the presure of the front/rear tires? Hmmm sounds intersting.

Oh yea, and gas milage should be effected by it too.

Has anybody expirimented with this stuff? Especially at the track.

Thanks, sounds like a good discussion.

 

Raising the pressure in the rear will induce oversteer. Increased pressure will cause the middle of the tires to wear faster. Lower pressure will cause the outside edges of the tires to wear faster.

I usually run 35 psi all the way around on the street. If I'm drag racing, I increase the rear pressure about 5 psi and decrease the front about 10 psi. If I'm autoxing or doing a track event, I drop the front pressure about 5 psi and increase the rear pressure about 3 psi.

Tire pressures are a personal thing, so what one person does may or may not work for you. Experiment when you're on the track and see how the car reacts. With practice, you'll learn what pressures suit your driving style and car.

 

Hey wow thanks shivers. I just put some air in my tires today, in hopes to increase some gas milage. I put some extra in the rear anticipating what you said about oversteer. Haveing a fwd car, I thought tha'd help create more neutral handeling. Who knows, we'll see. Thanks though!

 

remember to set your tire pressures cold. even driving to the gas station will raise your pressures. check them in the morning & write down your pressures. check them again @ the gas station. note the difference & add air accordingly.

 

yea thanks for the reminder man.

One question, are we talking garage ~50 degrees cold or outside ~36 degrees cold? If you do the chemistry there's a significant difference.

283K/32psi = 275K/xpsi
x = 31.09 psi.

Ok so there's like a 1 psi differance. Silly highschool.

Right well, I'm assuming 1 psi won't be too bad, so I'll just take presures at a temp somewhere in the middle so I'll only be 0.5psi off. Right then, moving on.

 

You converted temperatures to absolute, but you forgot to put pressures in absolute...

(32+14.6) * (275/283) - 14.6 = 30.7

Still not a real big difference, but remember after driving for 10 miles the TIRE temperatures can get hotter still.

 

ohhh clever! Good job haha

 

@ auto cross events, I acutually run the tires about 5-7 pounds higher than normal, a little higher in the rears, about 3-5 pounds higher. When the tires are warmed up, the pressure is about 5-8 psi higher than what i inflated to them. this has worked well for me, of course depending on what tires your rolling on. I used yokohama avs100's this year.