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09-26-2006, 02:54 PM | #1 |
Scooby Specialist
Member#: 45790
Join Date: Oct 2003
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2006 Corvette C6 Z51 SUPERCHARGED |
My turbo blew up.
Holy crap, I have NO LUCK when it comes to cars.
As you may recall my Version 8 engine melted piston #1 3 days after being ECUTEK tuned. I put it back together with Wiseco forged pistons and race bearings and a shimmed oil pump for higher oil pressure, drove it 2 days, 680 miles for break in, and yesterday on start up I found that it was burning spectacular amounts of oil. Looks like the turbo oil seals are blown. (This is a VF22 Turbo) How could it not smoke at all for 2 days and then start burning oil all of a sudden? Can a shimmed pump (one shim) make enough oil pressure at 4000RPM MAX to blow oil seals? Is there a way to rebuild VF22s? I can notice a fair amount of shaft play on it now, although the blades are intact and it already had a small amount of play when I got it, and that was never an issue before.
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09-26-2006, 03:05 PM | #2 |
Scooby Specialist
Member#: 103320
Join Date: Dec 2005
Location: Oklahoma City
Vehicle:1998 swapped Forester L |
how much shaft play? mine moved forward and backward about 2 mm. that was plenty of room for it to burn oil.
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09-26-2006, 06:52 PM | #3 |
Scooby Guru
Member#: 8785
Join Date: Jul 2001
Chapter/Region:
SWIC
Vehicle:02 c_turner@ix. netcom.com |
No way to rebuild. Toss in Garbage if in fact its blown. Its probably not blown however.... Its probably just to much oil pressure. You can try a restrictor in the oil feed line. Most of the time when this happens the turbo is not damaged once the oil pressure is lowered.
Clark |
09-26-2006, 07:32 PM | #4 |
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
Vehicle:2002 Impreza WRX WRBlue Perl |
The OP raises a good point.... Is it a good idea to be running shimmed stock pumps to bump up the oil pressure especially when running Garrett GT turbos which seem to be picky with regard to pressure?
Or are the Cosworth modded pumps (which does not bump up pressure but increases flow) the ones to go with? |
09-26-2006, 08:31 PM | #5 |
Scooby Specialist
Member#: 22290
Join Date: Aug 2002
Chapter/Region:
TXIC
Vehicle:2002 STI Ver 9 Spec C Wagon |
I'd prefer extra oil volume, not pressure, because some turbos are sensitive to pressure increases. For this reason, I watch my oil temps and pressure during/after warmup before I get into the throttle very much.
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09-28-2006, 10:09 AM | #6 |
Scooby Specialist
Member#: 45790
Join Date: Oct 2003
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2006 Corvette C6 Z51 SUPERCHARGED |
I just got an autometer electronic oil pressure gauge and it is pegged at 100PSI on cold starts.
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09-28-2006, 10:16 AM | #7 |
Scooby Specialist
Member#: 21980
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Central MA
Vehicle:2002 PSM WRX (Sold) 2017 BMW X5 |
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09-28-2006, 01:09 PM | #8 |
Scooby Guru
Member#: 65065
Join Date: Jun 2004
Chapter/Region:
Tri-State
Location: NJ
Vehicle:2004 EJ205 STi 2007 Forester STi |
my Maddad Clarity oil pressure gauge is pegged at 100psi when the oil is cold also. Its completely normal. During driving its at around 90psi.
When warm, the idle drops to 30psi. This will also let you know when its safe to romp on the car (when idle psi drops to ~30) because the oil is now warm and thin enough to properly lubricate the internals. |
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