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rswannabe rswannabe is offline
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Join Date: Mar 2004
Location: Seattle
Posts: 1,152
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, 11:00 PM
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