Overheating Issue only under boost

[Devin LeBlanc]

Happened on two cars to me. Both ended up having a blown head gasket.

 

[Turbo Habanero]

Happened on two cars to me. Both ended up having a blown head gasket.

What happened ? Over heating while boosting ?

 

[JDMMA70]

Ok just checked the overflow tank again its back to the normal level.

 

[Devin LeBlanc]

yes, and its only a small leak which occurs when the cylinder pressures are raised with added boost. Both cars were on the exhaust side.

 

[IndigoMKII]

Couldn't you get a cylinder pressure tester and just crank the psi up? Not insanely high or anything but at the estimated cylinder pressure while under said amount of boost.

 

[JDMMA70]

It looks like this 100'F heat is starting to get to the car so its just under boost anymore. I can almost always reolicate what happens by thrashing on the car it takes a few pulls though.

 

[Turbo Habanero]

What about at night when it cools down?

I have 110* days everyday out here and boosting never makes me overheat. Driving up a mountain on the other hand...

I have a aftermarket radiator and 2 electric fans (that don't flow as much as a clutch fan) and no undercover.

 

[grimreaper]

yes, and its only a small leak which occurs when the cylinder pressures are raised with added boost. Both cars were on the exhaust side.

^ had the same issues for near 2 years before it finally failed a block test.

 

[JDMMA70]

Fixed! It was the radiator I dunno what was wrong with the old one looked fine on the outside. Put a new radiator in and all my problems ceased. I did 15 pulls to 120 to get it really hot. No spikes, no boiling of the coolant, no overflowing overflow tank. It running nice and cool now.

 

[Turbo Habanero]

Nice glad to hear it.

 

[Kai]

Take the tanks off and look through it, see if it's sludged up - you did have quite a few bent fins on it before though, so it could be that, too.

 

[cmoser18]

Looks like I'll have to replace mine too

 

[mk3tattoos]

Just had to replace my mine too!!