Thanks for all that info guys. Ive been using up a set of fronts in about
100 laps on my gt6. Granted, I assume that my street t.d.'s are a little
different... but what all this seems to be pointing to is that maybe I
should drop the starting pressure from 27 a few pounds as my car is about
200-300 pounds lighter than your TR's. I think they rise about 8-10 pounds
when hot but I feel like I should be getting a little more life out of the
tires. Am I correct in thinking that a little less pressure will promote
longevity? I'm not even going as fast as you guys....YET.
Jason Ostrowski
Friendly Ghost Racing GT6
On Thu, Sep 9, 2010 at 1:20 AM, MadMarx <tr4racing@googlemail.com> wrote:
> A race engineer of a Porsche team said to me that the spread of temperature
> on the tires, measured from outside to inside, should not exceed more than
> 60F.
> 50-60F is the optimum for racing.
>
> Cheers
> Chris (who is running 4.5 degree at front)
>
> -----Urspr|ngliche Nachricht-----
> Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
> Auftrag von Jim Gray
> Gesendet: Donnerstag, 9. September 2010 03:55
> An: Norlin Engineering
> Cc: Greg Lunker Hilyer; FOT Triumph
> Betreff: Re: [Fot] Hoosier R6 tire pressures
>
> I reduced my camber from 3.3 front &
> 2.5 rear by three tenths for Topeka.
> At 3.3 I had a 13 - 16 degree spread
> From in to out with the insides being the hottest from 145 - 160.
> Reducing the camber resulted in the spread reduced to eight degrees.
> That didn't neccissarily make the car quicker. That set of tires was
> pretty well used by Friday.
> Have you taken temps with 4.5 negative?
>
> Jim g
>
> Sent from my iPhone
>
> On Sep 8, 2010, at 7:30 PM, "Norlin Engineering"
> <norlinengineering@comcast.net
> > wrote:
>
> > Just reread this post, and I think I see the difference. I'm
> > running 2 1/2
> > degrees camber up front and 4 1/2 in the back. Maybe the solid axle
> > cars do
> > need to run the higher pressures.
> >
> > Jim Norlin
> >
> > -----Original Message-----
> > From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net]
> > On
> > Behalf Of Greg "Lunker" Hilyer
> > Sent: Wednesday, September 08, 2010 5:13 PM
> > To: Jim Gray; Mark Vaden
> > Cc: FOT Triumph
> > Subject: Re: [Fot] Hoosier R6 tire pressures
> >
> >
> > "to cure for 24 hours. I understand there is some molecular
> > realigning going on during the cure period.
> > Jim G"
> >
> > FWIW -
> > After talking with the Hoosier tech guys, this is what I gleaned:
> > Heat cycle
> > a minimum of 24 hours before race temps. 5+ days after
> > heat cycle is preferred and anything under 24 hours doesn't do
> > anything. 15-20% increase in tire life with proper curing procedure.
> > Your results may vary but my results look to be at the high end ++.
> > According to them, a 2000 lb car will reach maximum grip near max
> > pressure of 41psi/cold. The trade-off will be less predictability and
> > a abrupt break-away... Fine by me.
> > That said, I run 38 front/36 rear cold on a 1977 lb, solid axle TR4
> > with -1/2deg camber up front.
> >
> > Greg "Lunker" Hilyer
> > TR4 #314
> > Albuquerque NM
> > _______________________________________________
> > fot@autox.team.net
> >
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> >
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