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Old 09-17-2006, 07:36 AM   #1
AnorexicSTI
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Join Date: Apr 2005
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2005 STI
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Default 05 STI - small crack in turbo housing

See this thread:
http://forums.nasioc.com/forums/show...1#post15273789

And here I thought I was the only one with bad enough luck to have a crack on my VF39 with only 24,000 kms on it....

What is the remedy besides getting an aftermarket turbo? Replacing with another VF39 doesn't seem to be a good option since there seems to be a greater than 50% chance that will crack as well. Is it possible to fix these cracks or at least prevent it from getting worse?

As for getting one under warranty, why not just say that you had a REPUTABLE shop install a downpipe (perfectly legit) and that while the downpipe was off, the mechanic inspected the turbo for this KNOWN problem that was mentioned on NASIOC. Isn't that sufficient to get a new turbo?

THIS IS TOTALLY GAY.... You'd think Subaru would get their sh$t together... Sh$t like this makes me 2nd guess going from a 100% reliable Honda to a Subaru...




But then boost kicks in, the AWD launches like a rocket, and then I wonder why I didn't go AWD turbo sooner .... once u go AWD, u don't go back .

As for porting the WG, I only took off about 1mm... probably a 1/16" rounded radius... I read about some guys doing 1/4" radius and I'm like WTF? that seems huge.. I decided to err on the side of caution... so far, the creep has gone away... if it comes back, well I can always port a BIT more... I have to install the COBB uppipe I bought so the turbo will have to come off again anyways... but so far so good... if u guys are doing this, do a bit at first... u can always take more off if necessary... the hardest part about removing and install the turbo is that stupid coolant line on the bottom... u need to install the hose on the bottom pipe first and clamp it... move the upper clamp down... install the turbo while "aiming" it down so the pipe goes into the coolant hose, then get under the car and lift that hose clamp up... a real PITA... it's also really hard to get that inlet pipe on... I removed the hex bolt on the manifold to allow moving the pipe forward about 3/4"... but even with that much wiggle woom, it's hard to get on... u need a flathead screwdriver to sort of pry the hose on.. be careful not to "poke it" too hard though or u may make a hole in the hose.

Other than those 2 things, everything else is pretty straightforward... some of the bolts and nuts are hard to torque due to space considerations, so hopefully u have a good "feel" for what various torques feel like... Do not overtighten the banjo bolt... only 20ft lbs... if u too tight, u will break it as I read on some guy's website.

Somebody mentioned getting new downpipe and uppipe gaskets to prevent leaks... I will probably do this when I install the uppipe... but so far, I don't think I have any leaks... what are they supposed to sound like? I was told a leak would be VERY audible.... any other way to test besides by ear?
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Last edited by AnorexicSTI; 09-17-2006 at 07:47 AM.
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Old 09-17-2006, 01:56 PM   #2
semaj
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Default

Quick question...why are you replacing the catless STi uppipe with the COBB one? The STi one is perfectly fine!

Be careful with the DIY porting of the wastegate, you can't go back!

AFAIK, cracking VF39's is VERY common...and usually has ZERO effect on the car's performance...don't be too concerned with replacing it yet.
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Old 09-17-2006, 02:12 PM   #3
veightkiller
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Default

did you say remedy? get a turbo swap!


edit: change it or live with it

Last edited by veightkiller; 09-17-2006 at 02:13 PM. Reason: .........
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Old 09-17-2006, 05:49 PM   #4
dwaynesti
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Default

I think alot of shops use the cracking as an excuse to push a new turbo on you, and or course they make money.

The cracking occurs on most of these turbos. From everything I have read
does almost nothing to reduce performance. True it will gradually get worse and worse, and maybe 8-10 years from now if might become noticeable.
I just don't think its something you need to be overly concerned with.

My turbo also has a small crack, I had it dyno'ed in Oregon, and bone stock
ran apparently one of the highest HP this shop had seen on a stock sti,
and they have done LOTS (pdx)
after I got my exhaust installed there, when they noticed the crack
they were all like , damn gotta replace that turbo, its robbing you of lots of power
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Old 09-17-2006, 08:25 PM   #5
AnorexicSTI
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Default

Quote:
Originally Posted by SubieDrift View Post
Quick question...why are you replacing the catless STi uppipe with the COBB one? The STi one is perfectly fine!

Be careful with the DIY porting of the wastegate, you can't go back!

AFAIK, cracking VF39's is VERY common...and usually has ZERO effect on the car's performance...don't be too concerned with replacing it yet.
The COBB is inconel... the STI one is nice, but the COBB is a work of art.

Looks like I need to port more... creep triggered a CEL today, but not after 10-15 min life before... i was able to go 150 kms this time with several runs in 4th and 5th without boost creep... I went SUPER conservative... like less than 1mm of rounding of that corner.. I'll try another 0.5mm or so on the next try.

As long as it doesn't affect the performance I don't care... but is there a proven method to at least prevent the crack from getting worse? Right now, it's tiny, but I don't want it spreading throughout the whole housing.
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Old 09-18-2006, 06:05 PM   #6
dwaynesti
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no its not limited to subarus at all
my talon cracked as well
made no difference in performance that I could see

some shops just try to use it to scare you into upgrading turbos
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