Hi, from my track day experiences, initially I wasn’t taking enough notice of tyre pressures when taking part on track days, however towards the end of my first track day I was starting to get a bit frustrated at how quickly the tyres seemed to be going off and a bit alarmed at the wear rate. To qualify I do tend to push on a bit as I used to campaign a rally car and quite happy to lean on the car. I didn’t tend to take much notice of tyre pressures when competing as the stages were short so less chance of heat build up, circuit work is completely different though. The heat in the tyres builds up quite quickly therefor the pressures rises. At higher pressures the tyres over-inflate and end up a bit balloon shaped, you end up riding on the centre section of the tyre which in turn becomes overworked and wears at an alarming rate. You also have a smaller contact patch which again reduces grip.
When the pressure is lowered (as much as 5-6 psi) as the tyre heats up you end up at the right pressures and the optimum contact patch equalling higher grip levels. I was astonished at the difference You go out on a session, first couple of laps are a bit squidgy but after that the grip level comes up & is then maintained without the tyre going off.
I’m not quite sure as to how this would work out on autobahns, as for all the tyres will be working at high speed, they won’t be experiencing the same corner loadings on track work, which will be the main reason for the rise in tyre pressure.
Sorry this won’t have helped your autobahn dilemma, however hopefully it will have helped explain what’s going on with tyre pressures on track days
All the best
Steve
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