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Artificially high presure in a road car will make it feel great at 6 or so tenths. The steering will feel more immediate, it will feel to have a little less body roll and compliance. But as soon as you start to push it a bit harder it becomes awful and then the tyres shortly overheat and it becomes really awful.
I was driving a friends M3 CSL on track a month or so ago on road tyres (not the cups) and it was understeering afte a few laps. The tyres were clearly goign off. Checking the tyre temps shows the centre to be overheated. He had started off with normal road presure and maybe added a few psi "'cos that's what the trackday people say you should do." I presuaded him to drop the front and rears (that were also overheating in the centre) to around 4 or 5 psi less than road (cold). Subsequent sessions the understeer did not return even after extended lapping and the car was flying.
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