HADNSE

what are you guys running? I'm having trouble dialing these p7000s in. too low and they screech and wallow. settled at 46 fr/42 r (max 51 or something) but the car still seems a bit tailhappy and at max grip the car is prone to get pretty loose. 255/35/18s all around. I miss the razor sharp turn in of the stockers.

HADNSE

hello anyone?
ps. today is thurs 7/19 not fri 7/20 as the posts are indicating

HedgeHog

That also depends on your alignment settings.

One way to optimize tire pressure is to mark the side wall (where the tread ends and the sidewall begins) with chalk and do some G-circles (drive around in circles)..or zip around a parking lot. Take air out if the tires aren't rolling over the shoulder enough and add air if it's running on your sidewalls.

Or better yet, get a tire pyrometer and measure temps on both outside edges and the center of the tire. They should be equal or close to it. If it's too hot in the middles, it's over inflated and vice versa. It'll also indicate if your camber is optimized. Too much inside temp = too much camber, etc.

BTW, my tires are set at 34# and drives pretty well. FYI, they're SO2 PP 245/40-18 F and 275/35-18 R.

HADNSE

Interesting - the S02's have a max inflation rec of 44psi and your 34 lbs. sounds alot more familiar territory to me.

Check this out, the P7000s have a max rating of 51 lbs. which I have set at 46 lbs. front.

THE BAD NEWS IS the rears are these P7000 SuperSports not the same kind of tires I later learned - freaking M+S's I didn't find this out till I left the shop and once tires are mounted (and driven on) tough **** for the customer. Those also have the lower 44 psi max.

Thanks for the chalk line suggestion, it's a classic and you must be a racer! I think I'm really screwed unless I get same tires all around. Believe me, the car handles evil right now at speed.

Tirerack (not who I got tires from) said I should put those supersports on the front. Damn, I just want to get rid of them but then it's either stuck with 7000s all around or eat it and buy all four new Toyo/Pilot/S0x's etc.

@!##$#$@$%!

HedgeHog

Max rating does not equal recommended pressure. It's the safety margin before it blows up. Most ppl overinflate to get a crispy turn-in response and feel. A low prof tire has such stiff side walls that the crisp response/feel is built-in. Tire pressure is to optimize the contact patch with the road. Some autox guys run Kumho Victoracer V700 (R-compound) down to 32/34 since the sidewall is stiff enough. I run 38# on my V700.

HTH.....

JeffShoots

I'm running 32 all around for the street on my latest set of SO'2 I run 2 psi lower in the front for the track for a little push.

Later, Jeff