[s-cars] Which pressure do you use in your tires for a track day

[Joseph Pizzimenti]

Trevor,
Check out Smarttire II from Tire Rack, of all places.
I know that you can see tire pressures and temps on a
little 1"x2" screen, mountable anywhere in that beast
of yours.

Pizzo
--- Trevor Frank <tfrank at symyx.com> wrote:
>
> I would start with 2-3 pounds lower that what you
> run on the street.  If
> it is raining maybe 5lb's lower to help get some
> heat into the tire.
> Look for the tire rolling over onto the side wall.
> This could mean that
> you are to low, that you have a sidewall that isn't
> stiff enough, that
> you don't have enough camber, that the suspention is
> to compliant.
>
> With 17's and a HRZ2's running 2.5deg camber in the
> front, I couldn't
> get the tires not to roll onto the side walls, and I
> was coming off of
> the track at 50+psi.  There was a Toyo rep and he
> was at a loss, we
> talked and we suspected that the tires couldn't
> handle the car, they not
> only where not stiff enough they also lost big
> chunks out of the tread.
> I went back to the drawing board and hit all
> possible problems, I went
> to an 18 that is a known good track tire, S03, I
> stiffened up the front
> suspension and raised the front suspension as well
> as stiffening it up
> with higher rate springs and putting in a spherical
> bearing on the top.
>
>
> With an 18" 35 SO3 I run around 35psi front and
> rear,  coming off of the
> track in the mid 40's.  With the tire rolling over
> just right.  With the
> spherical bearings in the front to maintain my
> camber setting so I can
> get away with it set at 1.5 in the front and 1.3 in
> the rear.
>
> I suspect that there is more traction to be gained
> with more camber but
> I really don't want to have to change my setting
> around every time I go
> to the track.
>
> With modern tires reading the pyrometer when you
> come off of the track
> gives little insight to what is going on.  I have
> talked to several tire
> guy's about this.  The temperature loss and
> conductivity the current
> radial tires is such that the data is often
> misleading.  I have had them
> recommend that I set the camber, and adjust tire
> pressure to get the
> appropriate amount of roll over.  I have been
> looking and some day I
> would like to build an IR tire reader with 3 -4 IR
> sensors so that I
> could monitor tire temps on the track.
>
> -----Original Message-----
> From: Frederic L'Huillier
> [mailto:flhuilli at hotmail.com]
> Sent: Tuesday, November 11, 2003 2:25 AM
> To: s-car-list at audifans.com
> Subject: [s-cars] Which pressure do you use in your
> tires for a track
> day
>
> Hi,
>
> I am wondering at which pressure do you set your
> tires for a track day.
> I suppose  (but may be I am wrong) you don't use
> same pressure for a
> summer
> track day versus a winter track day.
> Anyway thanks for you advices.
>
> Cheers,
> Frederic
>
>
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