Originally posted by elraido:
... but I read that it also effects performance..........any thoughts on that subject he should know about.
There have been performance drop reports by a few, but I fail to see how a performance loss is even possible with this mod. There have also been one or two reports that it affected fuel mileage. Impossible because it is METERED air that is bled off the intake AFTER the MAF, so the engine still knows how much air it is getting. That fact alone is enough to dispel both potential problems. The engine is still getting only metered air, so performance cannot be affected at all.
My theory is that those people touched something else that affected their performance. Nudged a plug wire that may have gotten nicked on the sharp edge of the UIM, cracked a plastic vac tube or elbow on top of the UIM, or a crack/leak developed in the accordian tube intake bellows. The throttle hang mod is also commonly used on E30 BMWs without issue.
Which reminds me, I've gotta pull the BMW outa mothballs and get her in to sellable shape... 
EDIT:
One last note to add to the site knowledge. Demon mentioned an exhaust volume/harshness difference if you gut precats. In BOTH cases on my non-SVT V-6 cars, I got almost NO difference in sound. This second time I had an SVT exhaust on the car, so if there is a difference it may be due to the higher compression and/or cam timing of the SVT engine.
Last edited by TourDeForce; 02/13/06 01:36 AM.
