[s-cars] Re: S-CAR-List Digest, Vol 7, Issue 98 - 17" tire size ideas

[Larry C Leung]

On an S-car, no, on a 2200 lb GTi/Miata/MiniCooper (not S), maybe 5. By
the
end of the 5 events, they'll be slow though. If auto-X, at the regional
level, a set
of R-rubber could last a whole season. If you go up a level though,
you'll need
fresh rubber. Generally, the heavier and/or more powerful (net, mind you)
the
car, the shorter the tire life. 

LL - NY


On Thu, 20 May 2004 15:51:39 -0700 "Trevor Frank" <tfrank at symyx.com>
writes:
> 
> I don't know of an r series tire that will last 10X track events on 
> our
> cars, but if you do let me know.
> 
> -----Original Message-----
> From: Larry C Leung [mailto:l.leung at juno.com]

> Sent: Thursday, May 20, 2004 3:32 PM
> To: s-car-list at audifans.com
> Cc: Trevor Frank; mlped at qwest.net
> Subject: Re: S-CAR-List Digest, Vol 7, Issue 98 - 17" tire size 
> ideas
> 
> 
> Well, some of these are true track rubber, some of these are more
> of a hyperactive street tire. I usually support separate 
> track/street

> tires, because, in the long run, it actually costs less to run that 
> way.
> 
> Since 17" street tires aren't really inexpensive, you'll really want 
> to
> get the 30K or so miles out of 'em they're generally capable of. 
> Track
> tires cost about the same, but with shaving and heat cycling (VERY

> important for track tire life for a heavy car such as the UrS or 
> even,
> perhaps a pony car ;-) they'll last much longer than full tread 
> street
> tires doing the same job. The difference lies in the performance of
> the track tires and near track (street) tires although I don't have 
> any
> practical
> experience on the wear life of the near track tires. Note, some of 
> these
> tires will live MUCH longer if the car has a TON (i.e. 1.5 degrees 
> or
> more!) negative camber, and they'll react better too. General 
> rule,

> square shoulder tires will NEED a lot of negative camber, but will
> likely grip/turn in better. This is my take, although I haven't run 
> on
> a number of these tires since the demise of my ex-Solo2 GTi....
> 
> IMHO....(my $0.02)
> 
> 
> > Date: Thu, 20 May 2004 12:43:20 -0600
> > From: "mlp5" <mlped at qwest.net>
> > Subject: RE: [s-cars] 17" tire size ideas
> > To: "'Trevor Frank'" <tfrank at symyx.com>,        "'marc weiner'"
> >         <marcweiner at comcast.net>, s-car-list at audifans.com
> > Message-ID: <000001c43e9a$537d9000$0300a8c0 at mpd530>
> > Content-Type: text/plain;        charset="us-ascii"
> >

> > I think the better answer is probably to set up a designated set 
> of

> > wheels
> > with track tires.  After doing this two weekends in a row, I can 
> see

> > that
> > it's a little unreasonable to expect that the same tires you 
> expect

> > to take
> > you home, reliably, ought to be subjected to the kind of abuse a 
> UrS

> > car,
> > especially if equipped with a good set brakes, can potentially 
> dish

> > out over
> > the course of a day. 

> >

> > So, who's got the pro's and cons for either:
> >

> >  - Kuhmo VictorRacerV700  -   Reasonable for a car without a true
> track
> alignment. A true
>                                                         Race tire, 
> but
> old design. Very forgiving. Not availible in
>                                                         all sizes.
> 
> - Kumho Ecsta V700 - Racier (faster) than the Victoracer, needs lots 
> of
> negative camber, or they'll
>                                         blister.  Not availible in 
> all
> sizes.

> 
> > - Michelin Pilot Cup - No experience, but big $$$$$.
> >  - Falken Azenis - super sticky street tire - probably the closest 
> to
> a
> track tire of a street tire
>                                 I've driven, much of the good feel 
> with
> better wear. Other runners in STS
>                                 seem to feel that the Pilot Sports 
> are a
> bit better performing, but nearly twice

>                                 the price. Again, this is a street 
> tire,
> not an R-rubber tire.
> 
> >  - Hoosiers - Excellent race tire, BUT, require an absolute TON 
> of
> negative camber or they'll
>                              likely self destruct. On lighter cars 
> (such
> as my GTi) they need 2+ degrees of

>                              negative camber, on a heavy rolling 
> super
> pig, I doubt you'll ever get enough
>                              negative camber to ever get them to 
> hook up
> properly. They're VERY light
>                              and have soft sidewalls, so they'll 
> only
> survive with LOTS of pressure which
>                               will load up the outer shoulder. When 
> the
> outer shoulder is that overloaded,

>                              they're is a risk of enough heat build 
> up
> to
> blister, and a light carcass will heat
>                              quickly. Heck, I managed to blister 
> Yok
> A008Rs (way, WAY back when)

>                              on a 2200 lb solo car (driver/fuel

> included) when I had to run them at 50 psig.
> 
>                               They wear out quite quickly, in 
> either
> compound.

> 
> - Bridgestone ? NLA in R compound type tires (RE-71RAZ, stunk 
> anyway,
> except in rain)
> 
> >  - BFG Comps TA-R (NLA, BFG is out of the R-rubber business. 
> What's
> availible are
>                              leftovers, and they're not discounted 
> much
> anyway
> 
> >-Yokohama 032R - Really more of a super street tire rather than a 
> true
> R
> compound tire. Not
>                         worth the effort, the newer Falken Azenis 
> are
> better street tires. The 032s and nowhere near an R-rubber tire.

> >-Yoko Advan 048 - Probably a heck of a near R rubber tire, BUT - 
> check
> availible sizes,

>                         probably quite limited.

> 
> - Other's to consider
> 
>         Toyo Proxes - RA-1 - true race rubber - exclusive race 
> rubber
> for
> SpecMiata. No experience
> 
> Teddy has a worthwhile comment however. Unless you are actually
> competing, go for bang
> for the buck.

> 
> 
> >

> >   http://members.rennlist.com/944sandmore/traktire.htm

> >

> > >-----Original Message-----
> > >From: Trevor Frank [mailto:tfrank at symyx.com]

> > >
> > >I bought the HTRZ II's and thought initially they where

> > >descent track tires, after one event in the rain.  At the

> > >second event I got a dry track and they chunked up really bad

> > ......
> 
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