M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: didgeridoodude on January 21, 2012, 07:53:37 PM
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I have a 1991 E30 318is and I'm not quite sure how to put on my cone air filter. I presume I need a conversion kit because of the location of the sensors. Any ideas? Thanks!
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the cone filter does not interact with any sensors, afaik. the part that actually bolts to the stock air-box, is square, and bolts to the airbox with 4 bolts. You need an adapter that bolts to the MAF unit, but has a round outlet rather than a square one. then the cone just goes onto the adapter's round outlet and is held on with a hose clamp. Be aware that a cone filter sitting there in your engine compartment is sucking in hot air, and may not even be an improvement over stock. 2 possible courses of action, that do have a positive result, you could buy or fab a sealed enclosure for the filter, then run a duct to a fresh air source under the bumper, behind the grill, etc. or you could keep the stock box, put a k&n performance filter in it, then run a duct (if your car does not have one) to the fresh air. I got one of the headlight panels that has a hole in it, and ran mine to there. I am not sure why some cars have this and some dont..my 91 318is does not have this panel, but my friends 92 e-30 convertible does. either way its an easy mod. I may even have an extra headlight panel if you need it
Geoff
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I already have the headlight panel, a sort of stock cold air intake. A friend of mine was giving me his extra cone filter for free so I was tempted to use that one but maybe I'll just do a DIY intake.
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It would probably be so close that only a dyno would know for sure, but I dont believe a cone sucking hot air would be an improvement over the stock air box breating cold air..and it will be louder for sure
Geoff
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Thats my thoughts as well, if I end up putting one on, I'd much rather have it hanging around a cold spot then sulking by the radiator and engine.