Quote:
Originally Posted by Dmbrown34
Ok...how do you properly use a pyrometer? I know you want to know the outside, middle inside temps and you want them even. But what does that really mean.
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If a tire has temps like this (one tire, left/middle/right):
140 160 140
then you have too much pressure and you should let some air out.
If a tire has temps like this:
140 120 140
then you don't have enough pressure and you should put some air back in.
If a tire has temps like this:
140 140 140
then you should play the lottery.
That's the basics. Of course things like camber can effect temps and you will often see uneven temps across a tire, but basically you want temps that make sense.
If your rear drivers side tire has temps like this:
140 145 148
and you are running -3 degrees of camber in the back then it sort of makes sense. The inside of the tire should be a bit hotter than the outside because of the camber, and everything is sort of linear.
I do think that 26/29 cold would be too much pressure for a R888 on stock wheels, however a lot of this also depends on how hard you run the car. I know that with the AO48s there were folks who were running their rears a few pounds LOWER than their fronts because they were running their cars HARD. While the first few laps were squishy, once the rears got up to temp their cars were some of the fastest on the track. Of course they were running at 10/10th (or often more like 10.5/10th). If you are running the car 5/10th or 6/10ths then 26/29 might be fine.