Just received my order for my K&N intake and debating whether I want to try to install tonight or wait till' it's cooler because it is 90 degrees here today! Very Hot! I can't wait to get it installed in my 2013 Fit!

 

Install it!!!! I cant have parts laying around, it drives me crazy. can you post up and let me know what happens to the low end in the car? say, below 2500 rpms please

 

Yeah I definitely can try to post what if anything I feel the difference or not.

 

Just installed it friday morning and went to Maine that afternoon and comeback this morning, so I got 662 Miles on the Intake now, but did notice that on the way back that either the low end seems to have disappeared a little bit or my gas pedal got a little spongy or maybe it's just still reacclimatizing itself to the new intake I'm not really sure though because I have never changed the intake in any of my cars before, so I am a little new to complete intake changes.
I am really not sure how it is suppose to react to a different intake then stock?

 

That feeling is normal even after the ECU acclimates itself. Although the stock intake is restrictive, it does a better job at creating vacuum at low RPMs. You'll probably notice even more low end power loss on really hot days.

This is why a lot of people just pop in a K&N filter into the stock airbox as you tend to stay in the lower powerband a majority of the time.

 

How can an intake that is more restrictive do a better job at creating vacuum, at any rpm?

 

Well it has everything to do with velocity and pressure waves, not sure what is meant by vacuum here. The stock intake is tuned with the motor and exhaust to work most efficiently with the stock motor and exhaust throughout the RPM range.

Unless the intake is extremely restrictive (which I don't believe the Fit's is, the piping size is decent), you won't gain power by changing it, you will just shift the powerband. A short ram like most of the intakes available for GE will have increased velocity and flow at higher RPMs which might give you a bump there, but it will suffer on the bottom end because you start playing with resonance... the stock intake is designed to play nice with the motor at a certain RPM, most likely at the lower end. When you change the length you change that RPM, and when you make the intake shorter, you raise that RPM. Make it too short, and the power will be unusable since it will be so high in the rev range.

Some good info here, not for L15 but for the 4AG guys, but the principle remains. Yes it's an old web page, bear with the awesome graphics lol
http://www.my-acoustic.com/Car/intak...ake/intake.htm

 

I guess I meant pressure ay low RPMs. Wanderer explained what I was trying to say in short pretty much. Sorry for the confusion.

 

ummm, by reducing pressure waves. There are benifits to a river curving and bending all over the place on keeping flow rates more constant than a straight concrete flash-flood viaduct. (and conversely one can be more adrenaline pumping than the other)

I installed mine at the beginning of the week. You pay for the quality of the parts and it is very proper. I thought the shield mounting for manual cars was a tad incomplete. For the first time ever, I've heard my engine actually make noise when on the pedal. That is notable because I can think of at least 20 occurences that I've been asked if it was an electric car while I've been actively driving it. Its nice to have a small but hugely appreciated acknowledgment that I really have an actual motor in the car. Light hearted jokes aside, I was caught off guard with the expected changes this would make to the car. Expectations were not for power but more akin to a lightened flywheel that the rpms would fly up and down much quicker. Not so much on that at all, instead there is a small additional bit of power but those gains are logarithmic as you get deeper into the pedal. Now with full disclosure, this is the change from a 6 year old filter with 80k on it to this; yes, I should fully expect a change from this. Whatever, I'm loving it and wanted to randomly share.

(some observations doing zero reading on the install prior. jesus christ, that stock airbox is like the size of the motor. That was a pain and a half to just be able to squeeze that out of the engine bay. And second, what is it with cars running coolant through the throttle body. I know its a fairly common practice but I've just never had to deal with that on a car. I should have been but was completely unprepared by the amount of coolant that sprays out of the car when you remove the lower coolant line when you go to install the replacement K&N line. Yup, As coolant came out like a drinking fountain 3 feet high, I kinda stood there with my thumb up my butt until it occurred to me that I should plug that hose in until I actually have unwrapped the replacement hose before I lose 2 gallons of coolant on my driveway. It was a personal shortcoming, I blame the drinking, I knew better on what to expect)


and this photo is flattering in making the stock airbox slimming. No hun, that dress doesn't make your butt look big


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Thanks for you explanation. Sorry for your coolant issues. It was entertaining though. Hehe!

Do you know what that hose connection piece is between your K&N air filter and your maf sensor? Is that the crankcase recirculation for the hose?

If so, it's kinda startling because I'm use to that hose being installed past the maf sensor but before the throttle body. This is because you wouldn't want a film of crankcase oil resting on the maf sensor itself.

Nice intake btw! I'm foaming at the mouth just at the K&N maf sensor piece. I MUST get my hands on a piece like that. Waiting on an HPS intake piece like that to arrive next week.

 

its not what you think. Its a bolt mount to secure to the heatshield.

 

My K&N definitely did the car a favor now that i've driven it around some more. I do like that it feels a lot smoother accelerating then it did before. Maybe it's just me or maybe not. I definitely like it a lot better with K&N then the stock one though!