[Fot] Racing tire pressure

[jim hearn]

I just had an autocross weekend where the course was 5 continuous laps
and I ran 31 lbs all the way around in my TR6.  What I am trying to
determine through this question and the experience of FOT guys is
whether or not there is any application on the race track for the TR6
factory recommended 4 (or so) lbs less pressure in the front than the
back.  I don't know what the factory pressure recommendations are for TR
3, 4, and 4A are but if they are similar to the TR6 (which is 4 lbs less
in the front than the rear), then my question extends to them too.
Also, I don't know if this type of engineering thinking is Triumph,
British, the era or what.  Any thoughts?

Jim Hearn
Sacramento, CA
Two '74 TR6s



-----Original Message-----
From: BOB KRAMER [mailto:rkramer3 at austin.rr.com] 
Sent: Sunday, October 21, 2007 7:50 AM
To: jim hearn; fot at autox.team.net
Subject: Re: [Fot] Racing tire pressure

I'm still early in learning how best to set up my TR4A but I have found
that 
30 front and 31.5 rear works OK with Hoosier Speedsters on my car. I
started 
our 30 all across and gradually upped the rears. Without the lower front

pressures turn in was too light. I had the car weighed the last time out
and 
I'm going to do some adjustments so my pressures may be meaningless to 
someone else.

Bob Kramer
rkramer3 at austin.rr.com
----- Original Message ----- 
From: "jim hearn" <jimhearn1 at comcast.net>
To: <fot at autox.team.net>
Sent: Saturday, October 20, 2007 11:43 PM
Subject: [Fot] Racing tire pressure


> It seems like for most cars the tire pressure is best a little higher
on 
> the
> front than the rear (i.e. 32 front and 28 rear) but factory
recommended 
> air
> pressure for the TR6 is for the street 22 front and 26 rear and for
"high
> speed" it is 28 front and 32 rear.  Does this (more pressure in the
rear
> than the front) prove out to be the most effective set up for the TR6
with
> race tires?  Any feedback on this would be greatly appreciated.
>
> Jim Hearn
> Sacramento, CA
> Two '74 TR6s (one street and one track)
>
> [demime 1.01d removed an attachment of type application/ms-tnef which
had 
> a name of winmail.dat]
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