enclosed K&N, gain of 3 HP

[geo3@earthlink.net]

Guys, the colder air accounts for an almost immeasurable amount of hp.  I
personally know of instrumented testing on a B14 SE-R, a P11 Primera, and a
Porsche 944.  In all cases the under-hood temps with the car moving were
within just a few degrees of ambient.

A CAI makes power mainly through resonance tuning.  A wavefront reflects at
the ends of open tubes.  Those wavefronts help speed along the incoming air in
a CAI.  This makes the intake, and thus the engine, more efficient, allowing
it to make more power.

You need to be careful what some monkeys post to the web.  First of all I
don't generally trust individual's dyno tests.  There are many folks here I
trust, but mainly that's because they have learned from Mike Kojima how to
conduct dyno tests (stabilze temps and other things before starting a run).
It's really easy to get pretty wide variations from pull to pull.  Some monkey
who doesn't know what they are doing could get all sorts of misleading
results.

Also, if the car was heatsoaked on the dyno, or at least giving off a great
deal of heat, an open filter under the hood might show loss on the dyno that
doesn't exist in the real world (see note about under-hood temps) and could
also be due to sloppy test procedures.

George Roffe