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Location:
Pilbara
Registered:
November 2004
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Location:
Terrigal
Registered:
May 2002
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Re: Turbo/exhaust question please help.
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Mon, 15 August 2005 00:45
 
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That sounds valid enough to me..
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Location:
Perth
Registered:
October 2003
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Re: Turbo/exhaust question please help.
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Mon, 15 August 2005 01:44
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If the wastegate opening pressure is stock i.e. no bleeding of signal then a free flowing exhaust will raise boost as the turbine is now flowing more exhaust but the size of the wastegate port is still the same size and spring pressure.
If you are bleeding air off you should just keep making more boost as the turbo is pushing more air into a sort of closed system or brick wall and the wastegate is closed.
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Location:
Pilbara
Registered:
November 2004
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Re: Turbo/exhaust question please help.
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Mon, 15 August 2005 06:23
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Thanks for the responses guys.
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If you are bleeding air off you should just keep making more boost as the turbo is pushing more air into a sort of closed system or brick wall and the wastegate is closed.
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Nah, I don't buy that mate, although I appreciate your logic. Bear in mind that this bugger is so restrictive that you can actually feel it choking once you get to around 10 psi. The boost is not read from the turbo but from the manifold.
If the exhaust is so restrictive that it actually flows at low boost levels but increased boost levels severely affect flow. A turbo will simply not 'spool' or boost when what you have said above occurs.
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Location:
Perth
Registered:
October 2003
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Re: Turbo/exhaust question please help.
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Mon, 15 August 2005 08:48
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Does the engine rev as quickly and hard as when the engine was NA?
If not I wouldnt go blamming your restrictive exhaust, it could be that the restriction is now on the intake side i.e. carby or the engine is not nearly getting enough fuel, I assume it is jetted stock still?
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The boost is not read from the turbo but from the manifold.
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You will get the same boost reading from the turbo as the manifold. The only time this changes is if you have a restriction between the turbo and the manifold such as an intercooler.
Why dont you put another slight restriction in the exhaust, say block off the tailpipe and test again. If 10psi is not meet either the restriction is most likely on the inlet side or your turbo is fuxored, timing is out, not enough fuel etc.
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Location:
Pilbara
Registered:
November 2004
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