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Old 07-27-2007, 09:57 AM   #1
nperkins
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Default Did I Pop a Head Gasket??

First off... My mods..
'04 STi, 46k original Miles
GTSpec Gen2 Header & UpPipe
Bosal Divorced Shorty Downpipe
Stock 2nd Cat & Midpipe
TurboXS RFL Ti Axleback
Apexi' AVC-R EBC
Enginuity ECU Tune
19psi of boost w/ 10.7:1 AFRs.

I just turned the car up to 19psi last week when I put the wideband on and did the retune... I am running pretty much stock timing. (Was 16psi before)

This weekend, I went out with some friends, had driven the car for approximately 15-20 miles, and when I pulled into a parking lot, as I was sitting, I noticed the temp gauge rising... I turned the car off, then back to ACC and kicked the AC on to force the fans on... Then, I noticed the overflow was full... I removed the turbo res cap & added some water I had in the trunk...

Since then, it keeps on pushing fluid into the overflow... I turned the boost back to stock levels to see if it was head-lift, and it still does it, even when I avoid boost.

I have tried burping the air out... Although maybe I am still missing a pocket... I have replaced both radiator caps with new OEM ones to try that...

Last night, after replacing the caps, I went on a "Spirited" drive for 5 miles or so, and the reservoir had filled up... At an idle, i also noticed the overflow tube pushing air bubbles into the overflow... Car was not overheating though... I pulled the overflow hose out, and put my finger over it, and did not feel any pressure/vaccuum... So it is letting air out, but ever so slightly...

I have been thinking head gasket, but i have no power loss, no smoke, no milkshake in the oil, etc etc...

Could it just be an air pocket? I have read the stories about how people have had extreme difficulties getting all the air out... Im wondering if maybe i had head-lift @ 19psi, and just haven't been able to get the air bubble out...
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Old 07-27-2007, 10:19 AM   #2
bren wrx
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stock timing at 19 psi? thats your problem Noah you probably damaged something, flush the system with a machine, burp it and start over - we rarely ever see sti's blow headgaskets
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Old 07-27-2007, 10:22 AM   #3
nperkins
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How is stock timing at 19psi a problem though? 10.7:1 afrs, no knock events detected... IAM's are high...
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Old 07-27-2007, 10:34 AM   #4
bren wrx
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when boost goes up, timing needs to go down. especially 3+ psi

if you left your knock tables have been left alone your knock sensor is silent in the areas where your timing ramps the hardest + 19 psi could have done some damage. And i know how you drive Noah. who tuned it?
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Old 07-27-2007, 10:38 AM   #5
nperkins
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I tuned it, and my timing curves are very flat... I would have heard a knock that would have been enough to do HG damage... Not to mention compression loss, milkshake, smoke, etc...

I am going to look at my knock tables again though just to make sure they are correct...

EDIT: Knock Detection ranges are wide open all across the band until 6500 rpms... Only thing I Noticed is that I may want to bump the load scaling up some on them...
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Old 07-27-2007, 10:48 AM   #6
jays05
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Isn't factory timing close to 30 degrees at redline?

I managed to lift the head, push some coolant out, and overheat the car once when pushing the stock block to 26psi with a 35r and a bit too much timing.
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Old 07-27-2007, 10:51 AM   #7
bren wrx
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Quote:
Originally Posted by jays05 View Post
Isn't factory timing close to 30 degrees at redline?
Yes this is something Noah may have forgot from his honda days. Bump the fine correction out further, the correction is also no good if the load is out of the range of the load you were seeing at the time of possible knock mr. 19 psi......be careful
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Old 07-27-2007, 10:54 AM   #8
nperkins
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i'm going to bump the fine correction all the way up to 4.0 load... Just to be safe.... But I want to find this problem first...
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Old 07-27-2007, 11:16 AM   #9
bren wrx
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then log it, but your rich afr is acting as a buffer to allow that hard timing for 19 psi, ask me how i know =)
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Old 07-27-2007, 11:29 AM   #10
nperkins
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I had logged the IAMs, Knock Events, & knock Signals... None came on...

Back on topic a bit though... What are my odds its Air Pocket vs HG?
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Old 07-27-2007, 11:48 AM   #11
bren wrx
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noah, if your knock sensor is silent past 6500 and your holding higher boost and 30 degrees of advance, what is going to get logged? think about it.
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Old 07-27-2007, 12:57 PM   #12
nperkins
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Understood. Will be fixed tonight.


I always forget some stupid mundane detail!
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Old 07-27-2007, 03:01 PM   #13
Dknits782
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thats good
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Old 07-28-2007, 01:06 AM   #14
bboy
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If you haven't detonated, you still could be creating huge cylinder pressure with timing and that will blow gaskets quite well.

NAPA sells a $25 "Block Tester" that is the best way to test for a gasket leak. Milky oil would be a terrible blown gasket. You aren't there yet. I'd say 95% of gasket issues dont' show "bubbles coolant" or "milky oil".
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Old 08-06-2007, 09:52 PM   #15
nperkins
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did the block test twice today... Negative... hmmm.... I'm trying to think if i did it wrong...

Going to try and get ahold of a coolant pressure system to forcefully purge all the air out and see what happens...
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Old 08-14-2008, 04:17 PM   #16
nperkins
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FYI, it WAS head gaskets on this.. EVERY test showed negative, INCLUDING the Smoke Dye test in the radiator.. Pulled the Heads, and found one TINY TINY little pressure mark in ONE of the cylinders.

ARP Head Studs + Cosworth Head Gaskets = Fixed.
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