Stem

Just got my new Michelin Sport Cups and I'm wondering what 02C2 track pressures work best??
I'll be at Watkins Glen and I love to be able to glom onto someone else's knowledge.

Any ideas or inputs??

Stem

Well, I may have answered my own question by going to the Michelin site. They say 25F/28R Cold to 32F/36R Hot.

Anyone know anything else??

kary993

You might try a search as there are many good threads about this from people have experience using MPSC.

Here is just one that was good.....

<a href="http://forums.rennlist.com/cgi-bin/rennforums/ultimatebb.cgi?ubb=get_topic;f=10;t=000246#000012" target="_blank">MPSC</a>

Stem

I knew I had seen that thread before. I just didn't use MPSC to find it. D'oh!!!

I'm gonna change my camber after this weekend at WGI. I think all I can get is -1.0 up front but that seems to be within the window of recommendation.

Ed Newman

We had a number of debates this weekend at NHIS about pressures on the MPCS. Michelin says about 34 hot, but my playing around led me to believe more was better. The car feels stickier with 44 hot. As I drop pressure, the tire seems to be looser. It was hard to get any good testing in due to light rain and a car with an affection to 'oiling' the track every time it went out. One of the other drivers agreed that they felt 'better' higher, but that may not translate to better grip. Looser may be faster, only more testing will tell the truth. I think I am going to get my new set of wheels with Hoosiers and do some good back to back testing in a few weeks at the advanced driver day at the Glen.

RSAErick

As posted in the Racing Forum... I has a similar experience to Mr. Ed Newman:

After a day with the MPSC's, I am more confused than ever about optimal pressures.

I started out at about 29 psi cold. After 2 sessions, the pressures had crept to around 38 psi hot. Personally, I thought that the tires felt pretty good at the 37 - 38 psi range, but I dutifully lowered the pressures to 33/34 psi front/rear. I didn't like the "feel" as well, and after finishing that session noticed that I was getting quite a bit of sidewall rollover!

What's going on here? My car weighs 3130 lbs w/ driver and 1/2 tank of gas, so maybe I'm heavier than the rest of you lightweights.

I should also point out that this is my first time out on R-compounds, so maybe I'm not recognizing the feel of a fast tire setup.... although the sidewall rollover indicates otherwise.

Erick

DJF1

I had exactly the opossite than what you are describing! When my rears were hitting 36+ I felt them slippery and had some oversteer. Once I lowered the pressure to 34 hot the back end settled nicely and I saw more speed.
I guess from reading the MPSC recomendations, the rear suspension and weight have significant impact on the handling and pressures.
I guess a pyrometer would be a great tool and it is on the shopping list...

RSAErick

Danny, I'm baffled. What's your camber set at? I'm at -2.4 front and -2.6 rear. The Michelin presentation says that this is within range, but warns not to get too crazy with camber. The sidewall rollover that I witnessed confuses me... but maybe I didn't warm the tires up sufficiently before tearing into them, and got the rollover while the pressures were still too low???

Sincerely,
Baffled in Bellevue

DJF1

Eric, the tires when they start cold they will have sidewall rollover. Then they heat up and they "inflate" at working temperature. So dont let that confuse you. I'm sure you are experiencing on your out lap some strange movements especially from the back. That is when your tires are flexing and you are building heat on them. I run 2.3 negative front and 2.8 in the rear so we are very close in specs. The only difference in our cars is the rear suspension which may play a big role here. I'm convinced that a pyro is needed to determine the proper temps and help the setup. Bottomline is what makes you feel happy and what are the lap times which result from the changes.

Yes besides a pyro you need a hotlap timer as well like I do <img border="0" title="" alt="[Wink]" src="wink.gif" /> I have done 4 weekends on them and I still have a lot of learning to do.
Good luck and have fun!

Alan Herod

I was starting at 26 cold, which turned out to be too high -- cross-reference thread --

<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=10;t=000246" target="_blank">http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic;f=10;t=000246</a>