Oops, too long again.
Begin forwarded message:
> From: Bill Babcock <billb@bnj.com>
> The only way to get it right is tire temperatures. Honestly, I don't
>understand why people ask "what tire pressure are you using". You might as
>well ask "what size pants are you wearing". A hundred pounds of total vehicle
>weight difference makes a tire pressure difference that's worth significant
>time on a race track and significant accelerated wear on tires. If you don't
>have a real tire pyrometer and test your temps then you are wasting money on
>good tires.
>
> Peyote hasn't worn out a set of tires in recent memory. They just heat cycle
>to the point that I'm losing time. I see racers with light cars with the
>center worn out of their tires and the edges still treaded. Overinflation,
>pure and simple. We don't have 400 horsepower and our cars don't weigh 2400
>pounds--our tires shouldn't wear out from racing. If an overinflated tire
>makes your car handle better it's because your camber is wrong.
>
> Chris, the engineer you were talking to is full of beans. If you have a 50
>degree F difference between inside and outside it's either because the reading
>was taken after a long straight or the camber is wrong. Do the measurements on
>a skid pad and you can get the inside to outside measurement within 10F.
>Unless you are running full radial slicks I bet that won't be at 4.5 degrees.
>You MAY, however, be able to go faster on some tracks with excess camber just
>because it puts less tire on the ground down the straights. Overinflation does
>the same thing. Not the fast way around corners though.
>
> On Sep 9, 2010, at 8:08 AM, Jason Ostrowski wrote:
>
>> 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)
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