Quote:
Originally Posted by PilotxERAU
This video runs a stock air box then an aftermarket one for a relatively large increase in hp/tq midrange. So unless the numbers are made up what is the explanation here? It’s a controlled before/after comparison.
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I suppose it would be an upgrade if you spend a lot of time below 5.5k RPM (street), but it does seem to drop off at the top-end - and the N55's top end was already not that great.
On the track, where you spend a lot of time around high in the RPM range I suppose the performance increase would be a wash. You'd gain time in corners where your gearing lands you below 4k but lose time in straights when you'd usually be running to red line. The dyno graph would suggest you'd want to short shift at around 6.25k RPM (I think, the video is a bit blurry).