just returned from another race weekend with the tr3 overheating. in a 20 min on track session the car gets hotter and hotter ending around 240 deg f. with about 1/2 gal of coolant blown out. i'm running a thick core, no crank hole rad. and an oil cooler. i try to shroud the rad. as tight as possible. is there an ultimate cure for this problem? thanks, ken m.