[QUOTE=e36jakeo;3248128][QUOTE=sayemthree;3247979]the top times , ACR and GT3 are on PSC rubber. I think even the GTR tires are aan almost R-comp tire. I am thinking the M3 could break into the 1.39's on R rubber? ]
a PSC will beat the PS by 1.36 sec. over a 30 sec autocross. translate that to a 1.40 time and thats over 4 seconds!!!! (tire rack tests)
http://www.tirerack.com/tires/tests/...ay.jsp?ttid=36