Quote:
Originally Posted by Thecastle
I'd be interested in seeing if there is any performance gain by swapping filters, I'm generally skeptical on these.
Though I suspect that a lower pressure drop filter will allow the turbos to operate more in their efficiency range pumping less heat into the intake, which has its benefits... Rather than any substantial increase in air flow, since the turbos are making requested flow correct? Probably would need a tune that can adapt to more flow, or request more flow.
I'd be interested to see if this would make any measurable gains.... Damn I want a bigger turbo for these cars.
My last experience I had a carbon fiber cold air intake for my MK6 GTI with both a K04 and 2867GTX turbo, and other than more noise and sound of cooing pigeons when I'd let of the gas they didn't make much difference, expect a little more flow at peak HP.
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I agree on being skeptical. Most impartial comparisons I've seen/read show the aftermarket filters can reduce power. This kind of made sense to me after seeing what it did to my MAF readings (if fueling is based on MAF, then a lower MAF reading would correspond to lower fuel injection and confusing AFR values....).
The SAE paper I linked in the first post did power/acceleration comparisons of 3 levels of filter restriction on the TDI and 335d. Both cars showed decreasing performance with restriction. The BMW lost ~2% with a "clogged" filter and 6.7% with a "severely clogged" filter. And this was on a stock vehicle...