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diffusers
Scientifically,I can only default to what Hucho shared in his work.However some of the members are having success with angles steeper than what is recommended and they're being careful about quantifying results ( science of the real world dyno ).I think the case-specific-basis is at work on this one.
Personally,I was losing some speed with an aggressive diffuser angle and had to tape it shut with cardboard.
Since top speed and drag go hand in hand I can only surmise that there is truth to the notion that they can be too steep.
To borrow a phrase from Darin,' tuft-testing is your friend.'
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