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rswannabe rswannabe is offline
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Join Date: Mar 2004
Location: Seattle
Posts: 1,122
As the purpatrator of the referenced dyno testing I thought I would chime in here.

Please note that in the referenced thread a total of 6 dyno runs were executed.
Actually Scott, there were 11 dyno runs altogether. I made multiple runs in each configuration (excepting the fully filterless configurations) and saw very consistent and repeatable results.

The thread you referenced talks about a 3hp loss when removing the stock air cleaner assembly. That was on a ~200hp engine. I'm not sure how valid that test is. That's only like 1%. If you run the exact same engine twice in a row you'll get that much error between runs.
BK911, the difference in performance between the stock airbox and the K&N filters were consistent over all runs made. The stock airbox made more power up to 6,600 rpm, the greatest difference being 7 hp at 6,200 rpm. This was not merely an instance of run to run variation.

1969 911 ST 3.8 EFI ITB - Irish Green, 1973 911 RS tribute 3.3 turbo - Gulf Blue, 1974 911 3.6 - Black, Beck 904 2.8 project - Silver, 1996 993 C2 - Polar Silver

2006 Forester STI, 1992 BMW 325 Cab S52 M3, 1952 MG TD with F20C
Old 12-30-2004, 10:00 PM
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