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Old 10-15-2012, 01:56 PM   #51
wgr73
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Originally Posted by NateLS1 View Post
I don't think so. The turbo won't build any pressure if the exhaust goes freely around it. Disconnect your wastegate so it stays open, go for a ride. You will not see hardly any boost at all. I've had this happen to me.


That's what the WG springs are for. Once you overcome the spring pressure...the gates open (especially wot). He is right
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Old 10-15-2012, 02:21 PM   #52
04wrexsti
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I would imagine. If you think about when you are WOT the wg is shut for the most part.
go listen to any EWG car and tell me that under WOT the wastegate isnt piss wide open? lmao.
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Old 10-15-2012, 06:26 PM   #53
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Originally Posted by NateLS1 View Post
I don't think so. The turbo won't build any pressure if the exhaust goes freely around it. Disconnect your wastegate so it stays open, go for a ride. You will not see hardly any boost at all. I've had this happen to me.
I'm sorry but it seems you have a misunderstanding of how turbo chargers actually work.
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Old 10-15-2012, 08:48 PM   #54
NateLS1
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Clearly I didn't picture what you said in my head correctly. I just envisioned a wide open waste gate allowing the exhaust to go around the turbo not allowing it to spool. Not the fact that it was maintaining boost. My mistake.
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Old 10-15-2012, 09:09 PM   #55
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Maybe you misread me? I said the most part which was bad wording. Unless you're trying to run low boost on a large turbo, that thing isn't wide open. Some have trouble keeping them shut at high boost on stock turbos.
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Old 10-15-2012, 10:47 PM   #56
decodeddiesel
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Maybe you misread me? I said the most part which was bad wording. Unless you're trying to run low boost on a large turbo, that thing isn't wide open. Some have trouble keeping them shut at high boost on stock turbos.


Listen, I am not trying by any means to get into a pissing match with you. If I am understanding correctly what you are writing you are simply not correct.

For example on my car, when I hit 14.7 PSI of boost my wastegate opens (Tial with 1 bar springs) and it stays open at any pressure higher than 14.7 PSI. The boost controler may modulate the wastegate slightly, but for the most part it is wide open. If you were to close the wastegate at high boost you would over boost like crazy and probably overspeed the turbo/blow the engine/etc.
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Old 10-15-2012, 11:26 PM   #57
NateLS1
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I think the key fact here is the wastegate is modulated. It is certainly open at target boost, but not necessarily WIDE open and it must close slightly and open slightly to maintain boost.

And what I meant by disconnect your wastegate in my first comment was physically detach the flapper from the arm, not disconnect the pressure feed which would cause an over boost condition due to the wastegate not opening at all.
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