[Shotimes] (OT) Michelin Pilot Sport Cups gone greasy

[Donald Mallinson]

Zach,

you and I may be the last people on earth to run the "groove of doom" 
R-1 BFG's.  BFG was very responsive when they had the club, but since 
then, I don't know.

My R-1's were bought through the Tire Rack and heat cycled.  I think 
they were also shaved.

They are wearing like iron, but are still pretty darn sticky.

Ron Porter thinks they are way too old and he is probably right, but 
they still entertain.  I am trying to get new tires for the convention.  
You want my old ones, you could corner the market on the groove of doom 
(my "doom" is only about half worn)?

Don Mallinson

Zach Leahy wrote:

>Good to see Michelin has good customer service on these.  I have a set
>of BFG R1's (the originals) that have the "Groove of Doom" setting in.
> basically there is a groove that vears out a little outside of the
>center of the tire, and almost everyone eventually experiences this. 
>Anyway, whaen I talked to some folks about them, they all seemed to
>say they knew nothing about the phenomenon.  I still have them, I used
>them for auto-x, but I have changed classes now so I guess I will have
>to take them to the track at the convention and wear them out.  They
>are pretty old anyway, so they probablty are about shot and dried out,
>but I might as well kill em off right?  :)
>
>Z
>
>On 5/10/05, Ron Porter <ronporter@prodigy.net> wrote:
>  
>
>>FYI, for the track folks mostly....
>>
>>Rick asked a question about the Michelin Pilot Sport Cup (MPSC) tires, then
>>after a long thread, he called Michelin and got the answer in the lower
>>post.
>>
>>Ron Porter
>>
>>-----Original Message-----
>>From: Richard Betterley [mailto:rbetterley@betterley.com] On Behalf Of
>>rick_betterley@rennlist.net
>>Sent: Thursday, May 05, 2005 1:28 PM
>>To: 911/993/996
>>Subject: Michelin Pilot Sport Cups gone greasy
>>
>>Looking for experience with MPSCs (used for DE events on my '84 Carrera).
>>I have put 45 heat cycles (about 12 months) on my MPSCs; my first time using
>>them.  Not knocked out by their grip (previous tires were Hosier SO3s,
>>before they had the 04 problems), but acceptable if I get a lot of wear out
>>of them.
>>They were fine until about 35 cycles or so, but really went greasy right
>>away at New Hampshire this week (previous event at Lime Rock, they were
>>fine).  Pressures were same as at Lime Rock, both cold (25/26) and hot
>>(32-33).  Lime Rock was sunnier and somewhat warmer, but I don't think the
>>lack of a sunny day makes enough difference for what I was experiencing;
>>lots more sliding around, although not terminal by any stretch (kind of fun,
>>actually).
>>Tread still is good (such as it is for a DE tire), worn on outside half,
>>much less wear on inside.
>>Camber settings are maxed out as far as can be with factory suspension bits.
>>So, what are others experiencing in terms of heat cycles?  I hear reports of
>>50-60, so I am getting there, but wonder if I can expect 60, or is my '35
>>then you start sliding' experience typical.
>>Thanks; still wondering whether I go back to the Hoosiers.  How are they
>>wearing?
>>
>>Rick Betterley
>>
>>Had a very fruitful exchange of info with Michelin re my Sport Cups going
>>greasy after 35 heat cycles.
>>Here is what I have learned:
>>1) Michelin is very responsive to requests for info and advice; good follow
>>up and knowledge
>>2) More than 35 heat cycles is expected; they didn't give me number I could
>>expect, but it sounds like it should be well in excess of 35 They asked me
>>to run the existing tires at next event (Monday next at Watkins Glen with
>>Todd and Tracquest) and then call them to discuss results, since going
>>greasy after 35 cycles was apparently unusual.
>>3) Negative camber 1.3-3.0 is ideal (pretty wide range)
>>4) Cold hot pressures should be 25/26 or so, hot 32-33, which I have been
>>using (at least on a 1984 911)
>>5) Tire temps should be 160-220 hot; I need to borrow a pyrometer to test
>>this.
>>6) Flipping tires is not recommended, due to their asymmetricallity.
>>Hope this helps anyone else using these tires.
>>
>>Rick Betterley
>>Rennlist and PCA Northeast Region member
>>1984 Carrera Coupe for the track (Guards Red #86)
>>1986 Carrera Cabriolet for the street (also Guards Red) 2000 F350 Diesel
>>crew cab duallie (tow vehicle) and 2003 CargoPro enclosed trailer
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