Random thought about K&N filters and DI
A CAI such as K&N is just a free flow filter. Paper filters restrict air flow a tad bit because they are so dense to catch dust where the free flows use oil that dust "sticks" to in order to catch and clean the air. Engines breathe better with the free flow as motors are an "air pump" the more air that gets in the more that goes out as to why some also install larger exhaust pipes, throttle bodies...ect.... same as when adding a turbo, need bigger pies to get that air out otherwise theres nowhere for it to go and crates extreme back pressures.
And who doesn't like bigger pies!
Member
Joined: Feb 2008
Posts: 4,329
From: Cleveland, GA
Mine never failed, but the Nissan boards are littered with all kinds of electronic failures.
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Joined: Jun 2017
Posts: 189
From: Ontario, Canada
I don't know if a Nissan is a good point of reference. In my Nissan days we saw regular MAF and throttle body failures. Modified or bone stock didn't seem to make a difference. Everyone after the fact would look for the reason. I think the real reason is inferior, low bidder electronic parts.
Mine never failed, but the Nissan boards are littered with all kinds of electronic failures.
Mine never failed, but the Nissan boards are littered with all kinds of electronic failures.
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Joined: Oct 2015
Posts: 1,465
From: Portland Or
A side note on K&N filters,, the gain is proportional to the size of the motor,,,
I've dyno'd engines like a 1.5 NA motor and you won't see much difference.
But put a 400+ Sprint car engine on the dyno making 8-900 HP spinning 9500rpm
and switch from paper to a K&N or a Foam ITG filter and you'll see 12 -20 more HP.
With a 100 HP engine, your talking 1HP or so.. So no you won't see or feel it on a fit...
I've dyno'd engines like a 1.5 NA motor and you won't see much difference.
But put a 400+ Sprint car engine on the dyno making 8-900 HP spinning 9500rpm
and switch from paper to a K&N or a Foam ITG filter and you'll see 12 -20 more HP.
With a 100 HP engine, your talking 1HP or so.. So no you won't see or feel it on a fit...
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Member
Joined: Jun 2016
Posts: 948
From: Foothills of the Smokies, east Tennessee
Wasn't asking for reasons other than might it contribute to coking in a DI engine, being "oiled" filters....as originally posted, just a random thought 
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Joined: May 2017
Posts: 187
From: Missouri
Some think a throttle body spacer makes a difference, really it doesn't do anything at all as its been tested. I had one on a monster truck, threw it away.
Member
Joined: Jun 2017
Posts: 189
From: Ontario, Canada
I don't know if a Nissan is a good point of reference. In my Nissan days we saw regular MAF and throttle body failures. Modified or bone stock didn't seem to make a difference. Everyone after the fact would look for the reason. I think the real reason is inferior, low bidder electronic parts.
Mine never failed, but the Nissan boards are littered with all kinds of electronic failures.
Mine never failed, but the Nissan boards are littered with all kinds of electronic failures.
dry filters are a good option, like R2C makes some killer filters. not sure if available for the Fits though.
yep it is, basically the same thing as the crc MAF cleaner.
with most rc motors becoming brushless, those sprays are getting harder to find and more expensive than before brushless became mainstream . i buy a case at a time and keep a can in my garage at all times. very good cleaner.
with most rc motors becoming brushless, those sprays are getting harder to find and more expensive than before brushless became mainstream . i buy a case at a time and keep a can in my garage at all times. very good cleaner.
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Member
Joined: Jun 2016
Posts: 948
From: Foothills of the Smokies, east Tennessee
True ....and even older guys are even more stubborn .....my father in law still uses Slick 50 ....I didn't even know that shtuff still existed...LOL. He adds it after an oil change, so he's overfilling his oil, but he pays no mind, says it works great. As far as being "set in my ways," I still bottle carbonate my homebrewed adult beverages, and still use tube amplifiers when I plug my guitars in
Member
Joined: Oct 2015
Posts: 1,465
From: Portland Or
Your totally right there,, some cars the paper air filters are $$$$
My KTM street bike uses a 90 dollar paper air filter, when this one wears out its getting a ITG.
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