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Re: AIR BOX mods re-visited
Chad, first of all, I did the airbox mods on my 77 scirocco. It worked
very well, however, we are talking about an antiquated (although very
nice) injection system. The airboxes on most Audis ARE NOT TUNED. I cant
say for sure about the newer audis, but the 5000's and <91 100's are not.
Figure on this.....if they were tuned, including the air horn, wouldn't
the filter scram all that tuning work anyway? You can't tune through a
filter. After the filter is a different story. I'm not going to make
factual statements about what kind of perf. increases you'll see by swiss
cheesing your box, you may not see any. But, if you do it as I had stated
earlier, you probably won't be bad off, as long as you don't over do it.
Be careful about 'RamAir' It is ok to force fresh cool air in the general
direction of the airbox, but not directly into the airbox. I experienced
this first hand as I constructed a whizzy creation to ram large ammounts
of air directly into the airbox on my race car. Around 100 mph, coming
into a long curve, i hit a headwind that not only buffeted to car, but
also the airflow sensor, giving me periodic rich conditions being put
through my combustion chamber. It would load up pretty bad. I wasn't
running an air filter as you all know of one to be, so the air wasn't as
baffled. It may or may not affect a real air filter, but I wouldn't
recommend trying it. The idea is not to force air into a fuel injection
system, it is to simply provide it for use.
A previous post about scooping up water should also be taken to heart.
BTW, regarding thermal reduction/insulation; although it is difficult to
fabricate so it doesnt rattle, making a heat sheild to fit between the
intake manifold and the exhaust manifold is one of the best ways to keep
the intake charge cool. Insulating the airbox may help somewhat, but
since the header is so close to the intake, and since heat rises, the
intake should be the first priority. I have one, made from thick S.Steel
sheeting on the race car. The temp on top of the intake runners was
hope that helps!!