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

Tue, 10 May 2005 22:06:41 GMT

Sticky Rubber Baby Boat Bumpers!

Kerby

-- Donald Mallinson <dmall@mwonline.net> wrote:
sticky boat bumpers!

Don

Ron Porter wrote:

>Just based on age, any R-1s out there are only good for boat bumpers on a
>dock.
>
>Ron Porter
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>On Behalf Of Zach Leahy
>Sent: Tuesday, May 10, 2005 4:05 PM
>To: Ron Porter
>Cc: Shotimes
>Subject: Re: [Shotimes] (OT) Michelin Pilot Sport Cups gone greasy
>
>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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>>    
>>
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