tire pressure

**LT1 > LS1** · 10-25-2008, 06:35 PM

right now, I got Eagle F1 GS's 275/40/17, and I got em about 24 psi. they hook pretty decent on the street, but If I dont roll into the throttle real softly, they spin, then go into wheelhop......I cant brake torque my car at all unless I really really have to roll into the throttle, and thats not real good.

so, what would you guys air these tires up to?

also, for street usage, (auto car) what PSI would you set some 275/40/17 nitto 555r's to?

**herculesrider1** · 10-26-2008, 10:50 AM

I had Yokohama's 275/40ZR17 and I kept 40psi in them and got perfect tread wear, equal all the way across the tread pattern, I think it also made me get better gas mileage...27mpg highway!

**herculesrider1** · 10-26-2008, 10:56 AM

When you underinflate your tires, it causes the outer edges to have contact with the pavement and the center of the tire is not in contact like it should...it will cause the center of the tire to bow and lift off the pavement. On the other hand, overinflation will cause the center of the tire to wear and the outer edges to wear less. Try 35 to 40psi and see if you "hook up" any better. I use to work for Goodyear.

**thearborbarber** · 10-26-2008, 04:03 PM

I run 38psi in my tires with even tire wear and good traction. I agree 100% with Herculesrider on his assessment of over/under inflated tires.

**JB454** · 10-26-2008, 04:16 PM

I was told the last time I spent around a grand for Goodyear RSA's to keep them at 30 PSI. I thought that was low but it also says the same thing in my doorjam. Check yours if possible. I never checked the wear because of playing on the road course, my fronts were chafed as hell and the back a little, but from spinning ended up worn pretty evenly across the pattern. Hope this helps. John

**thearborbarber** · 10-26-2008, 06:08 PM

In the owners manual there is some added info about high speed driving with z-rated tires. I can' quote it from memory but the jist of it was use the recommended tire pressure on the door sticker for regular driving and use a higher pressure for high speed driving.

**brianswimmer23** · 10-27-2008, 03:40 PM

i have used z rated tires for more than ten years and always have stuck with 35psi + or -2 psi. always wear great.

**qwk93ta** · 10-28-2008, 03:06 AM

I have always put my tires at 32 psi

**LT1 > LS1** · 10-29-2008, 07:15 PM

I have my tires at 35 psi now. they get wheelspeed to second, and get alot on the 1-2 shift.

it seems like they hook less, but the wheelhop is gone.

**TheSilverSurfer** · 11-07-2008, 05:25 AM

I set mine at 34 and the wear is great

**LS4U2NV** · 11-07-2008, 05:33 AM

well i have toyo proxies in the front at 32psi but i have m/t drag radials on the rear at about 16psi on the street and 8psi at the track. but all my friends with street tires and decent horsepower are all about 32-35 psi if your having that much problems hooking maybe you should think of using some drag radial or something comparable