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This explains why I recently lost 3-5 WHP throughout the RPM range by changing from the PR CAI to the AEM. I am running S3s, JWT ECU, HS header and HKS exhaust on my 1993 Classic.
Since the AEM has been touted as the "best" CAI, I was expecting to gain 2-3 WHP.
With the PR CAI the A/F ratios ran mostly in the high 12s and slightly over 13 between 4200 and 5200 RPM (a single reading of 13.3 at 4400). With the AEM, the engine ran richer by 2-3 tenths of a point in the A/F ratio with a max ratio of 13.0 at 5000 RPM.
Looks like I will be installing the PR CAI and heading back to the dyno.
Thanks for the insights, Mike.
Bill Conner
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