K&N
Who has replaced their stock air filter with a K&N? Are they really better? Improve performance, gas mileage, etc.
Forum Discussion
rhagfo wrote:
More air flow equals less filtration.
This is not a true statement.
If you read the Spicer report you will find out that there are several OEM air filters that out perform the K&N filter "air wise" AND filter better. The one on my LBZ Dmax does.
OP you will never see a mileage gain with a K&N filter if you have modern fuel injection on your TV and here is why.
Modern FI computers keep the air/fuel mixture just right. And I do mean "JUST RIGHT". Last time I checked, (A long time ago) the putters would update mixtures rates 100's of times a second. Yes they are that good. The term is stoichiometry.
So you can see if you get more air in your engine (with a K&N filter) you will also get more fuel so there is a zero sum gain in mileage. Now in the old days when carburetors were around most were set slightly rich so you would not have a lean spot in the throttle. That is when you would pick up a little mileage with a K&N because it would pass more air and lean the engine up a bit and you could pick up a little bit of mileage.
Anybody that say's they gained mileage with a K&N on a FI engine is full of it. They "might" be able to say they picked up 1 or 2 HP. Even that is up in the air to be true or not because of different restrictions in the engine.
