Quote:
Originally Posted by boneheaddoctor
THe problem with doing that (eliminating the whole K&N quality part of the argument) is that you would be sucking hot air from behind the radiator...vs cool air from the front of the car. Doing so raises intake air temps....reduces air density and that increases EGT's and reduces power.
I always preffer to draw air from outside the engine bay and the heat in it. But high enough above the road to eliminate the possibility of hydrolocking the engine if you hit standing water on a rainy day.
The stock air filter setup does exactly that.....
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I don`t want to get in a war on what`s the best filter set up to use of the location thing.
seems like a year or so back, someone took some temp readings in the engine bay in different areas with the car moving. and while moving there is plenty of cold air. when the car is in slow moving traffic and or sitting still, the temp will increase some. so while moving there shouldn`t be a problem.
With the exposed air filter (K&N or what ever style used) it will pick up a little more dust/dirt etc with the air swirling around in the engine bay.
Now with that said (and I don`t need any bad nastys thrown back at me) I have a K&N filter, 9" long and 15" around the circumfernce. It sits behind the R/F head light. I made a cover from some Batting (the ladies that sew will know what this is, ask your wives) cut it to fit like a sleeve. spray on the special oil, this is a prefilter. what I notice with a filter in this location, is the amount of black oil substence that builds on the front, in the area between the headlight and radiator. there is plenty of gaps where the air will come through.
This is probably the soot, oil blow by etc.... from other cars????
The factory air filter on top of the engine, is sitting on top of the turbo, = heat. now I don`t know if that causes a source of heat inside of the filter housing or not, plus the filter is in the highest point in the engine bay. although the air source is the horn over the R/F headlight, giving you the cold "Ram Air". also the same sootty oily substence is being sucked in, but as it swirls around in the stock filter housing, it is distributed in a larger area and not as noticeable.
I would mount the Cali air filter housing back into the area behind the R/F headlight. but with changing the cali intake manifolds and installing the AL-129-X 115amp alternator, it changes some what how to mount things back up.
Charlie