[s-cars] R compound tire pressures?

[LL - NY]

I forgot to mention, you do need (as I did use) a probe type pyrometer for
what little I used them for. Surface readings are of no value for tire
tuning.

On Wed, Aug 4, 2010 at 1:56 PM, LL - NY <larrycleung at gmail.com> wrote:

> Me thinks many here are responding for HPDE's rather than Lee's request for
> Auto-X.
>
> Not saying pyrometers are useless in Auto-X, but it's very hard to be as
> consistent, since tire temps don't get nearly as hot and they cool off very
> quickly vs. a set of track day laps. So, with tire temps, I was able to
> determine that I needed (or didn't, depends upon conditions) more negative
> camber, but I couldn't determine pressure front/rear balance using a
> pyrometer. Also, even on our longer (50 second or so) courses, I generally
> only see a temp gain of 2 - 3 psi after a run. What I (and most experienced
> members in our region) do is set cold temps on first run, and then let out
> air appropriately on subsequent runs to start out with the same pressures as
> cold at the beginning of each run.
>
> LL - NY
>
>   On Wed, Aug 4, 2010 at 11:38 AM, Mark Rosenkrantz <
> speedracer.mark at gmail.com> wrote:
>
>> Drop about 2-4 PSI for starters and see what the temps are (middle,
>> center,
>> outer) and adjust from there.
>>
>> Mark Rosenkrantz
>>
>> On Wed, Aug 4, 2010 at 9:01 AM, Lee Levitt <lee at wheelman.com> wrote:
>>
>> > I have some experience with street tire pressures for autocrossing,
>> > typically running 40-42 front, 38-40 rear.
>> >
>> > How different is the strategy for R compound tires? What cold
>> > pressures should I run for autocross and the track?  Car is a B5 A4
>> > with Eibach/Bilstein suspension (not overly stiff).
>> >
>> > Thanks!
>> >
>> > Lee
>> >
>> >
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