terrible boost leak. need help
10-25-2007, 04:18 AM
#22
1.0 BAR
Join Date: Dec 2006
Posts: 311
Re: terrible boost leak. need help
+1 Checking for rips/cracks isn't good enough. You need to pressurize the system from the turbo on. Build one of these and use it often.
http://vfaq.com/mods/ICtester.html
The other thing I can think of is the wastegate flapper sticking. I know its hard to see since you have the arm and actuator on the back side. There is a sleeve around where the flapper arm enters the hotside. I've had the sleeve work its way out part way. It causes the flapper to move with it, and uncover the wastegate port seading to a large internal exhaust leak that you can't hear. Very slow spool, and much lower boost than normal. It can move far enough to make the WG stick open or closed also. If you can get a mirror back there, see if that sleeve is close to flush with the hotside or not. It should be close.
Good luck.
http://vfaq.com/mods/ICtester.html
The other thing I can think of is the wastegate flapper sticking. I know its hard to see since you have the arm and actuator on the back side. There is a sleeve around where the flapper arm enters the hotside. I've had the sleeve work its way out part way. It causes the flapper to move with it, and uncover the wastegate port seading to a large internal exhaust leak that you can't hear. Very slow spool, and much lower boost than normal. It can move far enough to make the WG stick open or closed also. If you can get a mirror back there, see if that sleeve is close to flush with the hotside or not. It should be close.
Good luck.
10-25-2007, 09:24 AM
#23
1.0 BAR
Join Date: Mar 2007
Posts: 247
Re: terrible boost leak. need help
Originally Posted by aero
+1 Checking for rips/cracks isn't good enough. You need to pressurize the system from the turbo on. Build one of these and use it often.
http://vfaq.com/mods/ICtester.html
The other thing I can think of is the wastegate flapper sticking. I know its hard to see since you have the arm and actuator on the back side. There is a sleeve around where the flapper arm enters the hotside. I've had the sleeve work its way out part way. It causes the flapper to move with it, and uncover the wastegate port seading to a large internal exhaust leak that you can't hear. Very slow spool, and much lower boost than normal. It can move far enough to make the WG stick open or closed also. If you can get a mirror back there, see if that sleeve is close to flush with the hotside or not. It should be close.
Good luck.
http://vfaq.com/mods/ICtester.html
The other thing I can think of is the wastegate flapper sticking. I know its hard to see since you have the arm and actuator on the back side. There is a sleeve around where the flapper arm enters the hotside. I've had the sleeve work its way out part way. It causes the flapper to move with it, and uncover the wastegate port seading to a large internal exhaust leak that you can't hear. Very slow spool, and much lower boost than normal. It can move far enough to make the WG stick open or closed also. If you can get a mirror back there, see if that sleeve is close to flush with the hotside or not. It should be close.
Good luck.
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