1) Tires are stickier when they are warm.
2) They warm up from flexing (not from doing burnouts).
3) Lower pressures mean more flexing.
The trade off for running lower pressures in order to get more grip is mileage. I barely got 4000 miles out of my tires on the street when I was using 32 rear and 34 front ( I know, that's backwards, I'm an idiot blah blah blah blah). My last set was run at 36 front and 40 rear, and I got around 10,000 out of them and never had any sensation of losing grip during my typical commuting and weekend squiding around on the back roads. I just switched to PP2CT's and I'm running 36F and 40R and they feel awesome. I even got surprised by a sharp turn last weekend and as I was trying to get on the front brake to slow a bit, the brand new pads (puttin in plug for for Brad and Mary here) really grabbed up. Front end dove but didn't push at all.
Leather up, rubber down
NESBA #61 B