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
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>
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