Last week I spiked over 33.1psi (the ZT-2 sensor is only good for 33.1psi so it was probably around 35psi) and blew the freeze plug out of the water pump. I figured that I lifted the head and pressurized the coolant system. Today I while I was pulling the head, the 2 head bolts closest to the cam gears were only in hand tight, indicating stretched bolts. The gasket was blown out pretty good. The opposite side cylinder showed signs of near failure as well. Hopefully I'll have everything back together within a couple of weeks.

 

Yikes!! That is some serious ownage. What is this going to set you back cost-wise? Are you upgrading "while you're in there"?

Cheers-
Erich

 

Sux bro. Hope it all works out for you.

 

Finally sombody proved that head bolt upgrade is a must if running high psi., thanks bro., and good luck with the build!

 

Zeitronix is accurate to 35.5psi with sensor option1 and 60.3psi with sensor option 2.

You were boosting the exact psi indicated in the datalogs.

 

it probably wasn't the boost that killed the headgasket, but more the tune. You probably detonated. What type of fuel where you running for that spike to 33 psi? And are you tuned at 33 psi for that fuel?

 

My question is why did your boost spike so high? Why didn't the ECU hit the boost limit unless you had it maxed out?

 

I would have to agree.

The tip in problems you have been having by trying to pioneer the speed density setup on stock ecu is enough to damage the HG. It happens.

 

that sux kind of,time to upgrade now!

 

Also going by your mod list i would assume u r on stock turbo and to hit 35 psi on a stock turbo would be amazing!!!

 

My LCD display has only ever showed a peak hold value of 33.1 psi even when pressurizing the system with an air compressor. I can't datalog over 25 psi with the zt-2 sensor through mitsulogger, its only ever accurate if I datalog with the ZDL software.


I'm using AVC-R for boost control and have disable overboost in the ECU

I'm not knocking during throttle tip in, its just momentarily lean only when applying throttle during a high vacuum condition. There is also no sign of detonation, just stretched head bolts that allowed the head to lift.

 

mixmastermatt - other then needing a new headgasket, studs, and a freeze out plugs. Was their any other damage?

 

I'll be replacing the HG, studs, timing belt, water pump and main seals just to be safe. Everything else looks fine. No cracks, holes or warpage as far as we can tell.

 

From the looks of it, he'll need the parts listed above, plenty of machine work, and a new water pump. If I were him, I'd just build the 2.0 assuming there was no damage to the cylinder walls from detonation. Just like the other member said, "while you are in there..." so might as well, if you've got the loose change for it. Definately sucks though, either way, sorry to hear about the popped gasket. Best of luck with your next route!!!!

Jerry

 

Jerry: You're gonna scare the poor guy! Why do you say that he'll need "plenty" of machine work? Other than checking the cylinder head deck surface for flatness, just what additional machine work might need to be done?