PedalFaster

There's a link in his post.

ZBlue996Kam

Dan:

Are the MPSC pressures you listed above hot or cold? My guess is hot! Please clarify.

Thanks
Kam

Bill L Seifert

PedalFaster

Thanks, saw it, I gotta start reading more closely.

Bill

TheOtherEric

I don't have that "presentation" in front of me, but my recollection is that Michelin recommends about 34 F / 39 R, both hot pressures, for 18" wheels. Those numbers (more or less) go for 993, 996, and Boxster.

Brian P

Try this link : http://www.cb-racing.com/PilotCup_Presentation.PPT

smokey

What I found especially interesting about this Michelin presentation was their recommendation that the rears should be 8-9 psi lower than the fronts for a 944/951. I had been wearing out the middle third of my rear 032R's at 40 psi hot, and tried their recommended pressures. The wear across the rears is now much more even, although it's a bit squiggly until they warm up. I start at 29 f and 21 r (cold) to get their recommended hot temperatures, and it seems to work for the Yoko's.

DanS911

Thanks Brian for the link.


I have been struggling with grip with my '76 911 with the MPSCs (205/55/16 and 225/50/16).
What I think I got from that presentation is that I should get the rears at 35 or 36 hot and start at 32 hot in the front and bleed down until it corners right!
Got a DE June 19th, I'll let you know how things turn out.

JJayB

ScottMellor

RE: Corsa's.

Weren't you at WSIR. Did you see the instructor in the black turbo?
I'm telling you for steet/ track its a great tire. You will forget your MPSC.

Alan Herod

FWIW - With MPSCs I start with 22 cold to achieve hot pressures (33-35) and still end up bleeding off during the day. I am still wearing about fronts about twice as fast as the rears (911) even after I slotted the strut towers, removed the insulation goo at the top of the strut, adjusted the lip on the strut tower, and pushed the top of the struts inboard as far as they would go -- ended up with approx -1.6 on front. Different bushings would allow more persuasion. Stock sway bars and excessive body roll may have something to do with the wear rate. I am on my third set of rears and almost ready to order my sixth set of fronts. I discussed this wear issue here before and others also were experiencing faster front tire wear.

Although, I have been happy with the MPSCs, I am considering the Toyos since the car is approx 2500 pounds without me and given the 3000 lb rule of thumb. I am on my third set of rears and almost ready to order my sixth set of fronts.

mds

FWIW - I run MPSC on my car, camber -2.6f/-2.4r, hot pressure 32f/34r. For open track, I start 25f/25r cold and bleed as necessary to keep them at 32f/34r hot after each session. Pressure increases more on the rear, also tire wear is more on the rear. For autocross, I start at 32f/34r COLD and bleed them again after each lap to keep them at 32r/34r. I found it is much better to start at 32f/34r cold on the autocross. Starting at anything less and they will have no grip on the first lap.

ScottMellor

Weren't you at WSIR. Did you see the instructor in the black turbo?
I'm telling you for steet/ track its a great tire. You will forget your MPSC.


Hi Jim
My Corsa's arrived yesterday.
(BTW I had the P-Zeros with the suspect alignment, not MPSCs.)

What pressures to you recommend for the street?

Anir

Scott,

I've had great experiences (admittedly in DE's, not racing) with the older Pirelli P-Zero C's at Road America, Mid Ohio, & Putnam. Ran 245/35-18 front and 285/30-18 rear with 28-30 front (cold) and 30-32 rear (cold).

Also ran them all summer on the street, typically at 33-34 front (cold) and 35-36 rear (cold). I'm not sure how this translates to the newer Corsas, but we do have the same car and it may be a reasonable starting point.

They were also excellent in the one autocross I did.

If I have one complaint, it would be that they started to lose some grip at the end of a 25" run session at Road America, but that may have been due to me starting with too high of pressures for that high-speed track.

ScottMellor

Thanks Anir,

I ordered some directly after my last DE at WSIR, and was just curious because I've heard so little about them one way or another prior to hanging out with Jim. (Its AMAZING how nicely his "nearly stock" TT gets around)
The reason I posted is because I've never heard anything negative about them at all.
As you know, some people don't like Kumhos and some don't care for MPSCs and they will not be shy to say so and why.

Hopefully I'll get them mounted this week, and then I'm going to get a fresh alignment and corner balance.

It IS pretty noticeable how slick a set of tires can get if they get out of the sweet spot. I got my P-Zeros over 40 something psi once that day and they were quite greasy.

JCP911S

Ran Hoosier S04 for the first time at the Glen. Practiced on a set of year-old S03s with about 10 hard heat cycles (two races and some DE). Qualifying with the S04 was identical to my best S03 practice, and the track was just as good.... bit disappointed as I expected a bit of extra grip with new tires.

Just seat of the pants but I felt they stuck better at 42 lbs hot than at 45lbs. There was definately a difference of opinion on pressures...

Also they were definately going away the last few laps. Early on I could take turn 11 (fast lefthander) virtually flat. By the end of the race I was feathering almost to the apex to keep it off the curbing.

Maybe I just hammered them too hard at the beginnning of the race. and over heated them.. any opinions on consistency of these tires over a race?

Condition of the tires at the end looked fine... almost brand new. Plan to run them at Summit. Interesting to see how they hold up.

No worse than the S03s, but I'm not sure they are that much better either.

JJayB

ScottMellor

Re: Corsa's, try 32-33 ft cold and 34-36 rear cold for the street. Adjust in 2 lbs psi increrments up or down. BTW, enjoyed our day at WSIR. You will find a night and day difference with the new aligment and tires.