Quote:
Originally Posted by tarmactrr
You can't run PS4's on this car in the high 30's, as you'd roll over the sidewall. my tires were wearing right at the edge of the tread compound and the sidewall running 43psi hot front and 47psi hot rear. Temps were peaking in the 170's at that pressure. I was also running less (cold) pressure on the left side as PIR has mostly right hand corners.
Like I said, I could run in the 1:31's pretty consistently lap after lap, but I could only get enough grip to run a 1.29-1.30 on the very first lap after the warm up lap. After that they just didn't have the extra grip to do that pace.
As for stability control... I ran 4wd sport with both MDM and DSC off, and DSC off was much better. In MDM mode it seemed to overheat the brakes much quicker and was producing slower lap times. Being smooth with DSC off the car was very well balanced with no real scary moments.
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The tires and sidewalls will take a beating regardless due to (1) the weight of the car and (2) lack of meaningful negative camber. It is not surprising that your grip fell off so quickly at 43-47 psi. That is simply too high. (Makes perfect sense to start left at a lower pressure on a track that stresses that side more. If your hot pressures were even on the left and right side, then you got the relative starting pressures right. I do suggest you try high 30s hot. In any case, you can expect a set of these tires to be worn out after one track weekend due to the weight and lack of negative camber. (I corded the left front PS4 on my M5 at VIR after four track sessions. Consumables on cars like this on track get consumed quickly.)