Hi
I'm no expert either
but I agree
I have autocross (practice / non-professional) and I have (they suggest)
increasing tire pressure
I thought this had something to do with keeping the tires from coming off
the rim
in the corners
I'm not sure about that though
I was using stock Z rated tires
Charles Ackerman '70TR6 North Bend WA
-----Original Message-----
From: DANMAS@aol.com <DANMAS@aol.com>
To: gernot.vonhoegen@stir.ac.uk <gernot.vonhoegen@stir.ac.uk>;
triumphs@autox.team.net <triumphs@autox.team.net>
Date: Saturday, August 15, 1998 1:21 PM
Subject: Re: TR6 - Tires and Tire Pressure (kinda winded)
>
>In a message dated 98-08-15 14:52:02 EDT, gernot.vonhoegen@stir.ac.uk
writes:
>
>> while I agree with the thread on pressures, I disagree with the
>> improvement in handling due to higher tyre pressure. Typically the
>> improvement is a lower pressure. Higher pressure will give you a better
>> fuel economy when you drive on motorways where you don't expect much
>> cornering etc. If you want better handling, you will find that dropping
>> the pressure by about 5 psi below the recommendet setting will improve
>> matters. However, that depends on the individual tyre make due to
>> different grip and wear qualities.
>
>Gernot,
>
>I'm no expert (not even close), but according to Fred Puhn, author of the
book
>"How to Make Your Car Handle," higher pressure will improve handling. I
quote
>from the caption to figure 4, page 19:
>
>"Notice that you lose more by a small amount of underinflation than a small
>amount of overinflation. When in doubt, increase the pressure before you
try
>decreasing it."
>
>Figure 4 is a diagram plotting grip vs pressure. Grip drops off much more
>sharply on the low pressure side of the curve than on the high pressure
side,
>using optimum pressure as a reference.
>
>In the few years I hung out with the SCCA showroom stock racers (as a
>photographer for a local TV station), I was amazed at the high pressures
they
>used - often in excess of 45 psi, all on street tires.
>
>Dan Masters,
>Alcoa, TN
>
>'71 TR6---------3000mile/year driver, fully restored
>'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion -
see:
> http://www.sky.net/~boballen/mg/Masters/
>'74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
>'68 MGBGT---organ donor for the '74
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