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Tuning Restricted Engines

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Hi Guys,

Been lurking around on here a while but have not posted thus far.

Just wondering if you guys have any good ideas so far as tuning restricted turbocharged engines goes? Mostly encountered on rally cars these days (that I've seen anyway).

Has anyone seen any documentation, books or papers that go into this?

Presumably, the thing to do would be to measure the pressure differential across the restrictor and once the thing gets to a certain differential start reducing boost?

Or is there another philosophy about this type of tuning?

Thanks in advance for ideas!


There was a good thread about this last year. Check this out:

Hey David,

Thanks for that. I was really fishing for a bit more detail than that if anyone has any :D

Jack W