The Official Overboosted Overlords Club
04-09-2009, 08:50 PM
#902
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Is that a valid test? Does something that is designed to hold in positive pressure and release it at a certain point automatically mean it will be able to hold negative pressure? Wouldn't it be akin to putting a submarine in space, or a space shuttle in deep ocean?
I am being serious, not trying to be a smart *** or anything. Just wondering if it really makes sense to test wastegates in that fashion.
I am being serious, not trying to be a smart *** or anything. Just wondering if it really makes sense to test wastegates in that fashion.
04-09-2009, 08:51 PM
#903
Is that a valid test? Does something that is designed to hold in positive pressure and release it at a certain point automatically mean it will be able to hold negative pressure? Wouldn't it be akin to putting a submarine in space, or a space shuttle in deep ocean?
I am being serious, not trying to be a smart *** or anything. Just wondering if it really makes sense to test wastegates in that fashion.
I am being serious, not trying to be a smart *** or anything. Just wondering if it really makes sense to test wastegates in that fashion.
04-09-2009, 09:04 PM
#904
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Or am I wrong, and the wastegate IS under vacuum while the engine is under vacuum? Visualizing the pressures is confuddling me.
04-09-2009, 10:28 PM
#906
The Professor
I know the engines have both vac and boost, but the wastegate never is under vacuum right? True we arent talking about crush level pressures, mainly I was just wondering if holding in pressure from the opposite end of the spectrum would somewhow damage internals or something. I never really took one apart so I didn't know if there was anything within that would be upset by vacuum. Maybe a seal or component that is meant to flex in one direction only or some nonsense like that.
Or am I wrong, and the wastegate IS under vacuum while the engine is under vacuum? Visualizing the pressures is confuddling me.
Or am I wrong, and the wastegate IS under vacuum while the engine is under vacuum? Visualizing the pressures is confuddling me.
If you are able to cruise with the wastegate not opening then its fine. I had wastegate to atmos so it was super easy to tell if it was leaky or not.
The test is that you want to make absolutely sure that the diaphragm will open under boost. Just get an air compressor hook it up to the side port, give it 9lbs of air (or whatever yours is set to) and watch it actuate. Listen for leaks or spray some soapy water on the piston. Thats all the test it needs.
No reason to replace the wastegate or BOV, just rebuild them. Metal is metal, manufacturer is irrelevant.
What you pay for in higher priced parts is quality control. As long as you do the QC yourself its kinda pointless.
04-09-2009, 10:32 PM
#907
The only time the wastegate diaphragm is under vacuum is when you are cruising in vacuum.
If you are able to cruise with the wastegate not opening then its fine. I had wastegate to atmos so it was super easy to tell if it was leaky or not. - NO NO; the vacuum test is just easier to do than a boost test - the WG will never open in vacuum unless something is seriously wired wrong.
The test is that you want to make absolutely sure that the diaphragm will open under boost. Just get an air compressor hook it up to the side port, give it 9lbs of air (or whatever yours is set to) and watch it actuate. Listen for leaks or spray some soapy water on the piston. Thats all the test it needs. - This will work; or a vacuum test which doesn't need a compressor.
No reason to replace the wastegate or BOV, just rebuild them. Metal is metal, manufacturer is irrelevant.
What you pay for in higher priced parts is quality control. As long as you do the QC yourself its kinda pointless.
If you are able to cruise with the wastegate not opening then its fine. I had wastegate to atmos so it was super easy to tell if it was leaky or not. - NO NO; the vacuum test is just easier to do than a boost test - the WG will never open in vacuum unless something is seriously wired wrong.
The test is that you want to make absolutely sure that the diaphragm will open under boost. Just get an air compressor hook it up to the side port, give it 9lbs of air (or whatever yours is set to) and watch it actuate. Listen for leaks or spray some soapy water on the piston. Thats all the test it needs. - This will work; or a vacuum test which doesn't need a compressor.
No reason to replace the wastegate or BOV, just rebuild them. Metal is metal, manufacturer is irrelevant.
What you pay for in higher priced parts is quality control. As long as you do the QC yourself its kinda pointless.
04-10-2009, 08:47 AM
#909
The Professor
04-10-2009, 12:51 PM
#910
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That mentality was what drove me to install the turbo kit myself. Why shell out installation fees? Especially since if something went wrong and I didn't know how to fix it, I'd have to pay more for other people to fix it. DIY is good stuff. Educational and whatnot 
04-10-2009, 01:29 PM
#911
DIY is fine - as long as the time is worth it.... fixing the WG took all of 15 minutes; fixing that BOV on the other hand would have taken a lot longer... plus if we swap it to a piston BOV the respons time is better - and if we swapped it to a Synapse - low end power would be better and spool is faster - so for $300 bucks a win win.
04-10-2009, 03:38 PM
#915
Less restriction to flow is better - always... that is why people get CAI and and K&N Filters etc.... so if you are making more power in vacuum - it will provide more exhaust which wil spool the turbo faster - plus you keep more of your low end grunt.
04-10-2009, 03:38 PM
#916
Diego
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Alright so car starts by its self now and runs. I fixed the power steering prob, just messed with main harness on rack. I do have a minor oil leak i have to fix, and car wont rev past 4k. So gonna check my OMP tomorrow.
Also it smokes a lot. kind of mellows out but then comes back. Not sure what it is, the smoke its self is white.
Also it smokes a lot. kind of mellows out but then comes back. Not sure what it is, the smoke its self is white.
04-10-2009, 03:49 PM
#919
understand about restriction etc . But i've noticed that with a turbo there is hardly ever vacuum on the turbo side of the throttle body . It is always under pressure from what i've observed . So under that scenario - how can air flow from vacuum (after the filter) to positive pressure before the throttle plate ?
04-10-2009, 04:43 PM
#924
I can see it's a very good valve and that leaking air at idle is a good thing and that very fast response time when closing the throttle is a good thing .
But - I still can't see why it would spool up faster or make any more hp anywhere in the curve than any other properly functioning BOV .....
But - I still can't see why it would spool up faster or make any more hp anywhere in the curve than any other properly functioning BOV .....