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TurboKraft TurboKraft is offline
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Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 2,542
Funny that there's interest again in that little venturi cone thingy for the top of the air flow plate.

About 14 years ago the notorious Chris Fisher (then of PowerHaus) had those made because there was a similar part on his Euro-spec 500SEL. Did it help? Did it matter? He could sell it, so he had them made locally in Phoenix and sold them. Dynos were scarce back then, sophisticated Lambda dataloggers more so, and it was never installed and tested back-to-back.

Has anyone tested one back-to-back since?

Cole kindly lent us his modified CIS air flapper assembly that included one of these venturi / cone devices. We installed it onto a built 3.4L 1981 930 (same car used for testing of digital WUR and comparison of Leask WUR when it was a 3.3L, posted in another thread here). I couldn't see a really measurable difference in fuel delivery in back-to-back chassis dyno testing.
Chris Carroll
TurboKraft, Inc.
Tel. 480.969.0911
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Old 03-29-2010, 04:01 PM
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