El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 10/03/20 11:57 PM Author Share Posted 10/03/20 11:57 PM Exhaust place put an inspection camera through the exhaust and removed the dump, checked the wastegate, turbine housing, turbo bearings and exhaust manifold. Also checked what they could in terms of intercooler pipe leaks. Didn't find any issues.I think I might try to make something up to pressure test, or get tested, my intake system.Just a question on the wastegate test - if I'm disconnecting the line from the compressor housing so there is no boost reference to the wastegate, wouldn't that create a massive boost leak anyway? Given I bought a new solenoid, I might just fit it anyway. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,155 Member For: 16y 9m 14d Gender: Male Location: Melbourne Posted 11/03/20 12:06 AM Share Posted 11/03/20 12:06 AM if you disconnect the line from the compressor housing to the wastegate, it'll overboost (if the system post-turbo isn't leaking out the extra boost created) and the turbo will boost as high as the mechanical pressure in the wastegate allows. Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 11/03/20 12:31 AM Author Share Posted 11/03/20 12:31 AM So basically the turbo, with the wastegate shut, is able to overcome the boost leaking out of the fitting in the compressor cover? Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,155 Member For: 16y 9m 14d Gender: Male Location: Melbourne Posted 11/03/20 12:35 AM Share Posted 11/03/20 12:35 AM I don't think a reasonable volume of air would leak out of that tiny fitting, compared to how much volume of air the compressor wheel is moving out of it's outlet, so yes, it would overcome it. 1 Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 18/03/20 08:47 AM Author Share Posted 18/03/20 08:47 AM Made up a thing and leak tested pressurised the intake system.There's some hissing down in the front bar. Past Andrew left the hose clamps facing forwards, so I could get a socket through the grill and tighten but it didn't help. Think I'll have to remove the front bar and reposition some of the silicone joiners. At least I found something though! 1 Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 03/05/20 01:52 AM Author Share Posted 03/05/20 01:52 AM So a bit of progress with this. Over the past few weeks I've had the cat off the road tidying up a bunch of things, including replacing all of the intercooler pipe clamps behind the from bar with t-bolt clamps. Now tests fine for leaks. The car still won't boost past 10psi. However now it holds 10psi, rather than just falling over. Made me suspicious I had two problems going on, so I started testing everything again, in case the boost leak was masking the secondary issue when I first tested. And hey presto - disconnected the vac line from the compressor cover and had to jump off the throttle at 16psi. So I'm thinking maybe time for a new wastegate? Solenoid is new and I've confirmed it's not the tune (have checked it, haven't made any changes pre and post the problem and same issue if I flash in the 13psi workshop tune that was in it when I bought the car). Edit: when I suggest wastegate, I'm thinking due to a weak spring and the wastegate opening too easily. As opposed to a wastegate failure causing the wastegate to stay closed. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,155 Member For: 16y 9m 14d Gender: Male Location: Melbourne Posted 03/05/20 01:58 AM Share Posted 03/05/20 01:58 AM yeah, it sounds now like your wastegate is weakened and not holding how it should... test it by taking the dump off and checking with a compressor to see when the wastegate creeps/opens. Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 03/05/20 08:32 AM Author Share Posted 03/05/20 08:32 AM Looks like the genuine actuators are a bit rare too. Everyone sells the Turbosmart ones, but plenty posts about then being painful. Hopefully that's just an initial setup thing and once it is done and the WG DC fiddled with, would be ok. Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,036 Member For: 9y 9m 2d Gender: Male Location: Canberra ACT Posted 15/05/20 11:10 AM Author Share Posted 15/05/20 11:10 AM 15 pounds again!New actuator in and it is as good as gold. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now