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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
As always, devil is in the details. If you read the map above, it looks like ported shroud indeed gives better efficiency on boost threshold. But if you peek further, you see that shroud will actually give higher boost threshold (worse response) at low loads and boosts up to 1.2 bar (!). Once you start hitting 1.6 bar (which you probably never will in 930), ported shroud starts to shine.

Thus, ported shroud isn't always better. It depends on application. It's mostly used on very high boost diesel applications. But for moderate boost, it might actually make things worse.

Compressor map is needed in order to chose optimal turbocharger. Just drilling holes without actual map can easily make things worse.
Thank you for your time,

Last edited by beepbeep; 11-07-2009 at 04:08 AM..
Old 11-07-2009, 03:02 AM
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