BGTV8

You need to use a tyre pyrometer to check tread temps. Longacre do an infrared pyro although the probe type pyro gauge is substantailly more accurate. Delamination (or chunking in which whole tread blocks are thrown/torn from the tyre carcase) is univerally the result of an overheated tyre.

You are looking for a temp difference of 4-8 deg C inner to middle to outside of tread (inner temp of - say- 75 Degc, Mid-tread of 70 and outside of 65) would be a good temp as a conseqeunce of a 5-6 lap "run". A longer run at which the tyre reaches a stable temp, running the car at 10/10th, you might see temps around 85 degC after 20 or 30 minutes of 10/10ths driving. At temps above this, the tread will start turning to porridge and delamination will occur (as the rubber overheats, its chemical composition changes and "porridge" is the result, with rubber torn off by the road surface).

Infrared temp guns are not as accurate as a probe, but a lot more convenient.

With the tyre sizes used on a Zed, I'd be starting at 32psi and not expecting a hot pressure to rise by more than 6-7 psi max. If the pressure rises more, I suspect that the tyre compound ould be too soft for the application. Bear in mind that asphalt composition can have a marked influence on tyre temps and pressure build-up.

Are you aware of the R888 compound you used ... if it is the "soft", then the next set need to be the next grade "harder" - if "medium" you need to go to "hard", for instance.

RB