I finally did the K and N air filter

I googled "convert km/l to mpg us" and found a google conversion function. The above 27.2 km/l translates to 64 mpg US.

I'm guessing the object with the K&N filter is it's freer flowing? Not sure this equates to better mpg. More power maybe, as it's sort like a turbo: putting (slightly) more air through.

 

Here we go again.............

There are plenty of third party test results showing OEM vs many aftermarket filters, including K&N.

Manufacturers literature rarely helps make an informed, unbiased decision.

 

I had a K&N on my Nissan Sentra, and then on my Ford Fiesta that I traded for my '12 Prius C. So I wasted $55 on a K&N for a car I only ran for 8 months. I don't think I'm going to get one for my Prius C. The car has quite good acceleration with its stock air filter.

 

I've been very happy with my HPS intake with a K&N filter. I like the elimination with all of those passages and places where rats and mice can make their nests.

 

I've got that K&N filter on my C. But there was no noticeable difference in anything. mpg & acceleration was and remains the same as it was with a stock filter. But it does last longer so I'm good with that.

 

I'm still on OEM filter at 86K kms, looks pretty much like new. West coast air likely less dusty though.

 

Huh, never thought of that. Googling a bit lends some credence to that. I wish mine didn't look so good though. Ok, maybe this fall, will be 10 years, lol.

 

Big difference between a set of Mikuni carbs and modern EFI with mass air flow. When you're injecting fuel based on the actual mass of air going into the engine and feedback loops, any normal filter restriction, clean or not clean, almost becomes meaningless. Up until the point where the filter cannot support enough airflow for the engine.

 

Not my issue. I wanted to get rid of all those nooks, crannies and passages where rats and mice could make nests and free up the engine compartment. The freed area allows me an ideal place to put the oil catch can.

 

I definitely noticed a wee bit better acceleration with K&Ns on my Sentra and Fiesta. Plus I would alternate back and forth to the stock AF and K&N just to really compare the difference. Plus the K&N gave it a more powerful sound. The effect wasn't dramatic but it was there. I may possibly get a K&N for the Prius but not a cold air intake.

 

Just go easy on the oil, friends.

K&Ns are notorious at dealerships for driveability issues. Every time I had a Toyota come in with a lean code, saw excessive fuel trims, a MAF code, or had an idle concern on a vehicle with a K&N?

The MAF would invariably be gummed up.

It’s a little heated wire out there in the intake are with a thermistor beside it. When the oily air sucked through an overly-saturated K&N coats those elements... any trace of debris would build up a layer of insulation inside the MAF. It’d look like a tiny sweater was knitted in there.

A quick shot of electrical contact cleaner and it would run good as new, but that one can be tricky to figure out if you haven’t seen it before.

 

I'd use MAF sensor cleaner instead.

 

Yeah, I think I'll pass on the K&N filter for my Prius C. I don't want to foul some part of it up and not realize it and then have it fail and have to have expensive work done to it. I put a new air filter in it when I got it, I'll run that and be satisfied.

 

By MAF code do you mean Modified Air Filter by any chance?

I guess I'll pass on the K&N, though in other cars I've ran them in I've never had a problem with one yet.

 

MAF equals Mass Air Flow (sensor). It’s in the air intake, between air filter and throttle body.