Hard to say where your car is without ensuring the camber is right
first. Usually with radial tires like the Hoosier Speedsters you need
at least 2.5 degrees, though you might need more with a heavy car. If
you don't have camber right, then the feel of the car won't be a real
indication that your tire pressures are right or wrong. You can
overinflate a car with too little camber and get a better feeling
turn in, because the overinflation effectively produces both a
stiffer sidewall, and a bowed contact area which acts like camber to
some degree. It won't be anywhere near optimal, but it will feel good.
If you're getting oversteer on a Triumph then something is seriously
screwy. You've got to work at it to get oversteer on any Triumph I've
driven (admittedly mostly TR3's and 4 though I have a little seat
time on track in a TR6)
On Oct 22, 2007, at 5:31 PM, BOB KRAMER wrote:
> Bill,
>
> It was my copied response that mentioned too light. I did mean that
> on my car with equal front and rear pressures I experience
> oversteer, the kind that takes away speed because I felt like I was
> about to whip the rear around at all times. Dropping the front
> pressure definitely helped balance out that sensation. I'm not
> saying that it isn't faster that way, not yet at least.
>
> Bob Kramer
> rkramer3@austin.rr.com
> ----- Original Message ----- From: "Bill Babcock" <billb@bnj.com>
> To: "jim hearn" <jimhearn1@comcast.net>
> Cc: "'BOB KRAMER'" <rkramer3@austin.rr.com>; <fot@autox.team.net>
> Sent: Monday, October 22, 2007 11:17 AM
> Subject: Re: [Fot] Racing tire pressure
>
>
>> Jim,
>> The factory tire recommendations have nothing to do with racing.
>> In racing conditions you need to take into consideration two
>> things-- optimizing the contact patch and making sure the tires
>> are pointing in the right direction.
>>
>> The best tool for optimizing the tire contact patch is a tire
>> pyrometer and a skid pad (or a really tight and twisty race
>> track). What you want to see is even temperatures across the tire
>> which indicates the tire is pressing with essentially equal force
>> against the road across the entire tire. At a normal race track
>> you don't get a good indication of outer edge temperature because
>> it gets cooled as the car runs down the straight.
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