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esfourteen

my headgasket is already shot, I had to tow the car to the shop last week.

heat worked fine, the expansion tank would consistently push a bit of coolant out on higher boost pulls without overheating. so either exhaust gasses were getting in to the coolant through the headgasket under higher boost levels, or the turbos were boiling coolant creating air pockets.

I'm certainly not ruling out the possibility of exhaust pushing bast the headgasket into the water jacket, but I've only ever heard of that happening under knock. I tried running 100 octane and 17psi with 11.5 AFR and I still experienced overheating and pushing coolant, so I find it hard to believe it was knock related. keep in mind i am running an oem headgasket but using ARP L19 studs.

I really don't know what happened for sure, but I do know the way GTM routes the coolant lines to the turbos is incredibly inefficient, so thats getting sorted regardless, and I'll be switching to a cosworth headgasket. I'll know more once we pull the engine and take the heads off which should be happening this week.

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