boost leak question for advanced people only
The wastegate flapper arm cannot be sealed with conventional seals because of the massive heat the exhaust makes. The flapper arm is simply very closely fit through the housing so the actuator arm can attach to it. To leak there with a boost leak test is a little odd since you should only notice it if are driving the car since it is on the exhaust side of the turbo.
A boost leak in that area, to me, indicates the turbo itself is leaking from the intake side to the exhaust side. But, if you are taking 4 minutes to leak down it really isn't an issue because there will never be a time when you will be at full boost for 4 minutes. Not to mention that the turbo isnt spinning and there isn't any oil pressure within it. In other words...don't worry about it.
As for post # 15....An easy way to ensure your TB seals are, in fact, leaking is to wiggle the throttle cable attachment slightly when the system is under pressure. If the sound of the leak changes when you wiggle the cable attachment, your TB seals are leaking. Since you have an 03....I suspect they are leaking.
A boost leak in that area, to me, indicates the turbo itself is leaking from the intake side to the exhaust side. But, if you are taking 4 minutes to leak down it really isn't an issue because there will never be a time when you will be at full boost for 4 minutes. Not to mention that the turbo isnt spinning and there isn't any oil pressure within it. In other words...don't worry about it.
As for post # 15....An easy way to ensure your TB seals are, in fact, leaking is to wiggle the throttle cable attachment slightly when the system is under pressure. If the sound of the leak changes when you wiggle the cable attachment, your TB seals are leaking. Since you have an 03....I suspect they are leaking.
The wastegate flapper arm cannot be sealed with conventional seals because of the massive heat the exhaust makes. The flapper arm is simply very closely fit through the housing so the actuator arm can attach to it. To leak there with a boost leak test is a little odd since you should only notice it if are driving the car since it is on the exhaust side of the turbo.
A boost leak in that area, to me, indicates the turbo itself is leaking from the intake side to the exhaust side. But, if you are taking 4 minutes to leak down it really isn't an issue because there will never be a time when you will be at full boost for 4 minutes. Not to mention that the turbo isnt spinning and there isn't any oil pressure within it. In other words...don't worry about it.
As for post # 15....An easy way to ensure your TB seals are, in fact, leaking is to wiggle the throttle cable attachment slightly when the system is under pressure. If the sound of the leak changes when you wiggle the cable attachment, your TB seals are leaking. Since you have an 03....I suspect they are leaking.
A boost leak in that area, to me, indicates the turbo itself is leaking from the intake side to the exhaust side. But, if you are taking 4 minutes to leak down it really isn't an issue because there will never be a time when you will be at full boost for 4 minutes. Not to mention that the turbo isnt spinning and there isn't any oil pressure within it. In other words...don't worry about it.
As for post # 15....An easy way to ensure your TB seals are, in fact, leaking is to wiggle the throttle cable attachment slightly when the system is under pressure. If the sound of the leak changes when you wiggle the cable attachment, your TB seals are leaking. Since you have an 03....I suspect they are leaking.
The wastegate flapper valve functions only to "bleed-off"(bypass) exhaust gases from the turbine inlet area of the turbine housing. It is not normal for the integral wastegate flapper valve on the turbine housing to bleed-off any intake air whatsoever. This is not normal.
EDIT: My best guess is that you were refering to the WGA cannister and the actuator rod which emerges from it. Right?
EDIT: My best guess is that you were refering to the WGA cannister and the actuator rod which emerges from it. Right?
where to buy the seals: https://www.evolutionm.net/forums/ev...available.html
"how to" for procedure: https://www.evolutionm.net/forums/ev...aft-seals.html
When pushing the new seals in, use a screwdriver to make sure it goes in flush or use a socket.... don't bang the seal in uneven or it will damage it.
Last edited by tscompusa2; Sep 8, 2009 at 03:11 AM.