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Old 08-05-2008, 02:43 PM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default OK, what exactly "blows" with a leaking "blown" turbo?

Its pretty obvious now that the turbo is blown again, oil is leaking pretty badly out the seal.

But the turbo only has about 5000 miles or less on it, so the majority of parts should still be in fine shape. Shaft play is pretty non existent. But obviously the high amount of oil, and the high oil pressure have "blown" something. What exactly gets "blown"

Thanks!
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Old 08-05-2008, 03:22 PM   #2
Element Tuning
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673 WHP Element
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This really depends on the type of turbocharger you have. The Garrett GT series ball bearing turbochargers have very weak oil shields that can easily blow out with too much oil pressure. This is why we choose to run journal bearing turbochargers instead which want as much oil as you can put through them. This works out great on Subarus since 100 psi of oil pressure is not uncommon.

So if you have a GT series turbocharger and have no restricted your oil line this could be the problem. If you don't have enough oil supply this could also lead to failure. If you do not have your turbocharger's oil drain large enough or your kit is not engineered with proper placement in regards to the oil drain this could also lead to premature failure.

If your turbocharger has died with only 5k miles of use something is wrong with the way your feeding it oil or draining the oil. Often the banjo that feeds the turbocharger has a screen that can clog and is easily overlooked.

Good luck.
Phil
www.elementtuning.com
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Old 08-05-2008, 04:23 PM   #3
reddevil
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1990 Legacy wagon
goes 12.387 @ 116.5

Default

I have a gt30, journal bearing. I was running a 1/16th or slightly smaller restrictor, and this (tested this morning) was pouring out a pencil width of fuel from the drain line! So I remilled another restrictor @ .021", the smallest drill bit I can fit into my drill. Still a fair amount of oil coming out @ idle.

I am having draining problems though, so if the damn oil is backing up, then this could be the issue.

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Old 08-05-2008, 06:30 PM   #4
Element Tuning
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673 WHP Element
Tuning Pro Comp Engine

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Quote:
Originally Posted by reddevil View Post
I have a gt30, journal bearing. I was running a 1/16th or slightly smaller restrictor, and this (tested this morning) was pouring out a pencil width of fuel from the drain line! So I remilled another restrictor @ .021", the smallest drill bit I can fit into my drill. Still a fair amount of oil coming out @ idle.

I am having draining problems though, so if the damn oil is backing up, then this could be the issue.

One of your problems is likely because you are not supposed to restrict Garrett journal bearing turbochargers, only the GT series cartridges. I was working with very little sleep before a race and I don't know why I decided to (probably because I had been testing various turbochargers) restrict the turbocharger but I did restrict it to 50 thousandths and the turbine shaft snapped within 30 minutes of track time.

You should also be running an unrestricted 5/8ths oil drain (all too often people use plumbing fittings which are too restrictive). Ultimately it sounds like your draining system is inadequate so you are trying to make up for it by restricting the oil flow. The problem here is that the journal bearings need to be flooded with oil to not only stabilize the shaft (oil is the bearing) but to cool the center section.

The location of your turbocharger should be well above the drain fitting with a s close to a straight shot to the drain as possible. I see many kits with a 45 degree angle or greater or even practically a 90 degree bend and this is tough for the turbo to drain properly. Also if your turbocharger is mounted with too much angle, oil can puddle at the back of the seal and smoke away.

Also excessive crankcase pressure can be problematic with oil drains also. If you think you have something like what I've described above you may want to consider and oil pump like what they have to use in the 350z turbo kits since the turbochargers are mounted so low.

Good luck.
Phil
www.elementtuning.com
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Old 08-05-2008, 09:15 PM   #5
reddevil
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Join Date: Jun 2004
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Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

OK, replaced the turbine oil seal. That part is now "all better" and I am seemingly not blowing oil out into the exhuast....

But still leaking out the drain line.
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