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beepbeep beepbeep is offline
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Join Date: Jun 2001
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Originally Posted by WERK-I View Post
Thanks for your invaluable input. What I'm most concerned about regards to shrouding are the benefits of such a design when the throttle body is suddenly closed under full boost (i.e. changing gears).
Does a design such as shrouding help reduce those stresses on the turbo?


Well I believe that BOV will take care of boost peaks. So abrupt throttle closing is not really the turbo problem but BOV problem. They might react differently if BOV is malfunctioning but as long BOV works, there should be no issues.

On the other hand, different low-load surge lines on ported/non-ported shroud designs will give you different boost buildup characteristics after you shift and get on the gas again, depending on boost you run.

Turbo depicted above will have "low boost" buildup slightly delayed and high-boost sped up. But I bet differences would be quite small and in <1 bar boost scenario, non-ported turbo would be wiser choice.
Thank you for your time,
Old 11-07-2009, 06:14 AM
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