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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Originally Posted by RarlyL8 View Post
The holes do lead to the compressor. Benefit? I think it is mostly marketing.
Many turbos will hit full boost before 3000rpm, I would consider them a lag monster if boost comes later than that.

The real ported-shroud does indeed offer benefits. But it doesn't have home-made holes. it looks like this:

And this is the difference:

If there are any old pilots here they might remember old 707's with "blow-in" doors on engines which were sucked open at takeoff. Ported shroud works in similar way but it's constantly "open" so you loose litte bit of efficiency to lower surge margins.

Thank you for your time,

Last edited by beepbeep; 11-06-2009 at 05:09 PM..
Old 11-06-2009, 04:52 PM
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