Your instructor is both right and wrongI don’t think I’ve ever seen it mentioned online, and I had no idea, nor did my track buddy that’s been tracking his 911 for 13 years. Until my last instructor showed me.
So he showed me a neat little trick on my GoodYear SuperCar3’s….there is a GoodYear “wing” emblem, on the side of the tire. For track, you adjust your pressure on each tire until you’re scrubbing the tip of the wing.
So I checked Michelin’s - same deal, there is a marker, but it’s a little “balloon man”.
This seems so very simple to me, and last track day after adjusting the first session I was spot on, and the car felt amazing.
Not sure if this is just common sense that everyone knows, but it sure seems like it’s a really good starting/reference point for anyone adjusting pressure for track.
My instructor said tire MFG will also put an “arrow”, I just googled it, and this looks like he was correct.
Thank you for taking the time to explain. It makes more sense now.Your instructor is both right and wrong
Yes, tires do have a reference mark that you don’t want to go over but tire pressure is not the only reason why you would go over or not
The other main and even more importantly factor is camber
Let’s say that you don’t have enough negative camber in front and the tire is rolling over the symbol, jacking up the tire pressure to solve this issue is not only the wrong way to correct the issue but could also increase understeer by reducing front traction
+1. I would rate myself a "novice-intermediate" driver with something like 15 days experience gained on 5 different tracks at this point in time. I run the Firehawk Indy 500 tires in 274/40r18 and found if I start the day at the normal 32 psi cold they will heat up to 37-38 degrees and seem to like it there. At that hot pressure they are predictable and perform well. One day by the last session which was 25 minutes, I noticed they got really squirrelly toward the end of the session. I checked the pressure after the cool down lap and they were at 40 psi.In my experience, 38PSI is the upper limit for hot pressures, above that grip falls off quickly. 36-37 when hot would be better. Adjust your cold pressures so you stay at or below 38 when heated up on track.