cars get VERY hot on rolling roads.
blimey mine never have and iv used them quite alot with my jap car, i assumed thats why they have the huge blowers on them keeping them cool... my temp gauge never rises more than normal driving when its been on the rollers, and the mk 4 i just had superchipped certainly didnt as i was keeping a eye on it..
did this place not have blowers then?
The coolant temp is not the problem, even basic fans will keep the coolant temp to around 90 if not the cars fans will kick in to assist.
The problem is turbo, engine heat soak and forced air intake volume. When driving on the highway at 70mph the huge amount of air which the car is pushing against keeps a constant cool air flow which will keeps the CAT, exhaust and the turbo cooler, and the hot air with in the engine bay gets hit with a huge volume of fresh air which recirculates it out under the car.
Nick
