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Old 04-18-2009, 01:54 AM   #1
nuppy
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Default headgasket blown? opinions needed

Well to start off i just finished building my motor in my 05 sti a couple weeks ago and now im just working the bugs out of it. Had to fix a couple minor things but now its this. Iv had to drive it back and forth to the tuner too many times fixing one thing after the next.


Here is what is happening. Tuner said the car is making around 300whp which is nothing close to which it should be at. Car idles perfect sounds good and runs strong all the way through. Since he is not seeing the expected numbers he first thought it was the larger tmic that i had which wasnt flowing well so i swapped it back out for the stock sti tmic. This made the problem worst and now he is saying that i have a water leak and water is getting inside the cylinders. I dont see any condensation in the cap and the oil doesnt look milky or anything.

Im pretty much stuck at this point in what to do. Not sure if i should tear down the motor or if the problem is something else. Dont want to waste a bunch of time and money Opinions?


Current mods:

Stock pistons and rods
12mm oil pump
ap fuel rails
pe 850cc
walbro pump
TGV deletes
ebay tmic
tial bov
3 way ebc
BC 280 cams
BC valve springs and retainers
TD06-20g 3in inlet and 8cm exhaust ported iwg
header/up-pipe
invidia catless tbe
injen cai
perrin inlet
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Last edited by nuppy; 04-18-2009 at 02:03 AM. Reason: edit mods
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Old 04-18-2009, 03:20 AM   #2
alcoolaid
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How much boost?
Do a compression/leakdown test.
Doesn't seem like your tuner knows what he's talking about.
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Old 04-18-2009, 03:31 AM   #3
subaruNV
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who built the motor??
what was used in the rebuild- was everything replaced with stock parts and brand new gaskets all around?
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Old 04-18-2009, 05:27 AM   #4
sjl1614
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Did you use ARP studs? The nuts have been know to loosen on them.
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Old 04-19-2009, 04:07 AM   #5
dem1k
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Im certain he used ARP studs
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Old 04-19-2009, 02:43 PM   #6
nuppy
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Sorry for the delay but i built the motor. It has brand new pistons and rods and a new crank since the other one was trashed.

It has arp studs but i really dont think they would just come loose like that.
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Old 04-19-2009, 02:43 PM   #7
nuppy
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Quote:
Originally Posted by subaruNV View Post
who built the motor??
what was used in the rebuild- was everything replaced with stock parts and brand new gaskets all around?

yes all new gaskets and everything was replaced
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Old 04-19-2009, 02:49 PM   #8
godforbid67
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Damn sucks man, does it smoke at all? My car smoked a lot when my gasket was blown.
Btw, you have any vids of your car at idle.
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Old 04-19-2009, 02:57 PM   #9
nuppy
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Quote:
Originally Posted by godforbid67 View Post
Damn sucks man, does it smoke at all? My car smoked a lot when my gasket was blown.
Btw, you have any vids of your car at idle.

no i dont. it idles at about 900 with no lope at all.
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Old 04-19-2009, 04:16 PM   #10
foolio
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Look it your coolant resivor. Have a friend rev up the engine. If you see bubbles then your have a head gasket leak.
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Old 04-19-2009, 11:05 PM   #11
nuppy
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Quote:
Originally Posted by foolio View Post
Look it your coolant resivor. Have a friend rev up the engine. If you see bubbles then your have a head gasket leak.
This is what im going to do next, just didnt get too much time today to check.
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Old 04-21-2009, 01:59 AM   #12
nuppy
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Quote:
Originally Posted by foolio View Post
Look it your coolant resivor. Have a friend rev up the engine. If you see bubbles then your have a head gasket leak.
checked today and it doesnt appear that i have a coolant leak...

not sure on what to do next...maybe new tuner
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Old 04-21-2009, 05:42 PM   #13
madmax718
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You also need to check the motor hot. You may not have a leak that comes through the coolant anyways, it could be the other way around. But it doesnt sound like a head gasket, as you are not loosing coolant (or are you?) and you are not overheating.. only low power.

Check your EWG. what spring do you have in there?
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Old 04-22-2009, 02:11 AM   #14
nuppy
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Quote:
Originally Posted by madmax718 View Post
You also need to check the motor hot. You may not have a leak that comes through the coolant anyways, it could be the other way around. But it doesnt sound like a head gasket, as you are not loosing coolant (or are you?) and you are not overheating.. only low power.

Check your EWG. what spring do you have in there?

Im not loosing coolant and I dont think i am loosing power but the dyno shows otherwise. The motor feels like it is running strong and making power. Any sort of way its the dyno?

Im running a ported internal wastegate
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Old 04-23-2009, 06:44 AM   #15
modog88
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It wouldn't hurt to pull your plugs and look for any type of burnt water residue or sitting water droplets. If you see a residue or droplets, pull that head, check your gasket. Your might have a tourqing problem. If your heads, gaskets and plugs check out check to ensure your cams are the proper ones. You say you have 280's, go back through the specs and check your lift. Ensure you dont have any mismatch parts, that all that you have put into your car are meant to run with each other. These are just basic things I have learned from doing sbc's for the last 15yrs.

Last edited by modog88; 04-23-2009 at 06:45 AM. Reason: mispelling
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Old 04-23-2009, 06:27 PM   #16
madmax718
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some dyno's will vary quite a bit. 20-30hp isnt uncommon. but before you pull the heads off or check the studs, I'd run a leak down test...
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Old 04-24-2009, 01:42 PM   #17
nuppy
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Quote:
Originally Posted by modog88 View Post
It wouldn't hurt to pull your plugs and look for any type of burnt water residue or sitting water droplets. If you see a residue or droplets, pull that head, check your gasket. Your might have a tourqing problem. If your heads, gaskets and plugs check out check to ensure your cams are the proper ones. You say you have 280's, go back through the specs and check your lift. Ensure you dont have any mismatch parts, that all that you have put into your car are meant to run with each other. These are just basic things I have learned from doing sbc's for the last 15yrs.

Going to check the plugs again when i get back home. They sent me the wrong cams before so i know for a fact that i got it right this time. Checked and made sure everything was secured correctly.

Going to run over everything again and do a leak down test. Hopefully this tells me what the problem is.
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Old 04-24-2009, 02:05 PM   #18
cribbie
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look below!!!
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Old 04-24-2009, 02:06 PM   #19
cribbie
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Quote:
Originally Posted by modog88 View Post
It wouldn't hurt to pull your plugs and look for any type of burnt water residue or sitting water droplets. If you see a residue or droplets, pull that head, check your gasket. Your might have a tourqing problem. If your heads, gaskets and plugs check out check to ensure your cams are the proper ones. You say you have 280's, go back through the specs and check your lift. Ensure you dont have any mismatch parts, that all that you have put into your car are meant to run with each other. These are just basic things I have learned from doing sbc's for the last 15yrs.

If there is a head gasket failure present you will not see water residue, i have neaver heard of this. Your spark plug is expose to some outragous amount of heat and share that with some coolant (Steam effect) will quickly wash out anything you had for carbon everywhere!!!!
You will see a plug that looks brand spanking new like the day you put it in if there is coolent present.

Try installing a presure gauge on your rad cap and and run your motor up for a while and see if the coolent presure increases more then it should.
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Old 04-27-2009, 05:23 PM   #20
madmax718
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I've never seen it on a spark plug, but hey, what do I know. I have seen it on the valve though. It turns green.
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