Quote:
Originally Posted by Eddie25
Anyone rate these K&N filters or are you just paying for the name? Here a K&N cost 6 times more than the Simota. I am not worried about the re usable or washable or those gimmicks. I just wan to know which one wil give me better increase in power? I keep having to gear down to climb some long hills around where I stay and it really hurts my FE. There are other things u can do to improve my FE but I want to start here.
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There are might be some MPG gains with K&N, but they are "special case". I have tested K&N on Prius C, and the manifold vacuum had dropped from 1.2-1.6 psi by 0.3-0.5psi on average. This is with RPMs in 1-2,5k normal operation range. That would indicate 2-3% better volumetric efficiency.
Note that this is hybrid, so ECU runs ICE at low vacuum with throttle plate open enough to keep intake pressure close to barometric. Most of conventional designs run engine with higher intake vacuum, so any improvements you'd see will have to come from situations which dictate low vacuum.
2nd I am not sure how the higher intake pressure will and if translate into MPG gains as this is function of ECU programming.