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Possible problem with turbo


GrayZee

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I have been trying to figure out a problem with a turbcharger giving too much boost. Even with the wastegate puck opened all the way gives this L28 20+psi. At first I thought maybe the bleed hole was too small, but it is 7/8", should be big enough to bleed a fair bit of exhaust pressure?...

 

Now I am thinking maybe the turbo itself is a problem, it is a hybrid t3/t4 however I have no idea what the specs are on it. The compressor housing is quite large and has a 3" inlet and 2" outlet, however the exhaust outlet is only 2" Is it possible that the compressor housing is far too big for the turbine housing? A small exhaust wheel would get the compressor going very quickly (which is does..) but once the engine pushes out the exhaust it chokes through a small housing causing a pressure build up inside the engine and therefore the 20+psi right away...

 

 

Any thoughts on my "theory"??

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I remember someone having a similar boost creep problem with a similar setup to yours. They were able to port the wastegate hole to allow more exhaust gas to bypass the turbine. Focus on the short side radius if you plan to try this. Maybe you can enlarge the hole and use a larger gate too.

 

Check out Jason's Z31

 

http://www.redz31.com/pages/wgactuator.html

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