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#221
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Thread Starter
#221
Good track day at Sonoma, but a bit mixed on the car. Second to last session outside air temp was pushing 90F, the car started overheating at the end of the main straight, scared the crap out of me as the coolant temp shot up immediately and just pegged the meter. It came right back down when I let off and drove easy for half a lap. Brought the car in and didn’t see anything obviously wrong, and the car had handled it just fine previous track days.
Took the car out the last session and the first half of the session was fine, but overheated again in the same place.
Once I got home, I discovered some slimy stuff apparently leaking out of the return for the coolant reservoir (that I’d just replaced late last year when the previous one cracked)
My theory now is that the sort-of leak was preventing the coolant system from pressurizing, and at the end of the main straight after the turbo dumped a bunch of heat into the engine oil, that was causing unpressurized coolant to boil in the sandwich cooler stacked with the oil filter. The sandwich cooler is seemingly in parallel with the rest of the engine, I’m hoping that means the engine is okay and was still getting coolant enough from the bottom of the radiator 🤞
Suspecting another broken/cracked header tank, I ordered a ProAlloy tank from Whoosh. Expensive, but the weld quality of the piece that showed up definitely seems worth the price of entry. Partly I also picked it because it uses an old-school metal radiator cap. I am SO tired of the OEM style plastic radiator caps coming apart!
Took the car out the last session and the first half of the session was fine, but overheated again in the same place.
Once I got home, I discovered some slimy stuff apparently leaking out of the return for the coolant reservoir (that I’d just replaced late last year when the previous one cracked)
My theory now is that the sort-of leak was preventing the coolant system from pressurizing, and at the end of the main straight after the turbo dumped a bunch of heat into the engine oil, that was causing unpressurized coolant to boil in the sandwich cooler stacked with the oil filter. The sandwich cooler is seemingly in parallel with the rest of the engine, I’m hoping that means the engine is okay and was still getting coolant enough from the bottom of the radiator 🤞
Suspecting another broken/cracked header tank, I ordered a ProAlloy tank from Whoosh. Expensive, but the weld quality of the piece that showed up definitely seems worth the price of entry. Partly I also picked it because it uses an old-school metal radiator cap. I am SO tired of the OEM style plastic radiator caps coming apart!
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