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Old 04-18-2002, 11:19 PM   #1
jacklock
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Question Who has a K&N panel filter in their WRX?

Hey everyone,

I assume alot of folks have the K&N air filter in their cars as it seemed to be a pretty inexpensive and popular mod. My question is how often to folks clean and recharge it with the K&N sprays? I've logged about 26K miles on it since April 2001 and I was wondering if I'm due.

-Jack
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Old 04-18-2002, 11:30 PM   #2
Aaron Stein
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Take a look at this:

http://www.i-club.com/forums/showthr...k%26n+cleaning

I hope this will help.
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Old 04-19-2002, 01:31 AM   #3
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I insprect my filter every oil change and clean it every other. So

3000-4000 Check it out
6000-8000 Clean it.

One thing to add to the instructions in the link above, be VERY careful NOT to over oil the filter. It can clog the filter and starve the engine of air.
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Old 04-19-2002, 01:54 AM   #4
sajohnson
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Default K&N Cleaning

As with any filter, the best way to determine if it needs cleaning is to hold it up to the light--either the sun or a bright light--and see how much passes through.

Generally, they shouldn't need to be cleaned more often than every 25-50,000 miles, depending on conditions. I've had mine in for almost 20,000 miles and it still looks almost new.
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Old 04-19-2002, 07:42 AM   #5
RidinLow
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I pulled mine after 15k mi and it was completely black. Just tapping it caused all this crap to fall out of it, so I cleaned & reoiled it. My airbox is breathing directly from the fender, but I don't know if that affects how quickly it gets dirty.
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Old 04-19-2002, 07:56 AM   #6
GRWRX
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I clean mine about every 6000, and a lot of dirt comes out.
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Old 04-19-2002, 09:27 AM   #7
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It should b pretty obvious when it needs to be clean (ie, real dirty). Else no need to worry. It depends a lot on how (and if) you did the silencer mod, if you bring in a lot of air from the fender well and you drive on a lot of dirt roads the filter will get dirty a lot quicker and you'll have to clean it more often. That's it!
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Old 04-19-2002, 12:41 PM   #8
BlackWRX
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Default k & N

Hi, saw your post concerning the cleaning of your K & N, actually I was wondering if and how much of an improvement did you notice by replacing the stock filter with the K & N. I used to run one in my old Civic Si years ago, I never really noticed a big change in performance, but it beat having to replace the stock one ever so often. Have you timed your with the filter?
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Old 04-19-2002, 03:32 PM   #9
JSTFERFUN
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Bump.

Same question as BlackWRX. Any measured increase in performance as claimed by the manuf?

Thanks,

Eric
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Old 04-19-2002, 04:35 PM   #10
Corn-Picker
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The dyno runs I've seen on i-club forums show a 1-2 HP LOSS for the K&N filter or no gain at all. Also, I've seen pictures of K&Ns that have "disintegrated" for lack of a better word. I wouldn't want little disintegrated filter bits sucked into my engine.
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Old 04-19-2002, 05:06 PM   #11
chmoorewrx
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Getting ready to put one in my WRX. In my old CRX, K&N made a small difference only noticable in the right conditions. There's a long straight up Sugar Loaf Mt. outside of Boulder. The CRX would accelerate up through 3rd, then shifting into fourth would be at the bottom of the power band and stop accelerating. With K&N, it got up farther into the powerband and started accelerating again. Only time I ever noticed it.

I've run K&Ns in all sorts of vehicles - cars, bikes. trucks, quads....I guess that's it. Never had one fail. I think it's a great product even if it doesn't increase HP.
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Old 04-19-2002, 09:04 PM   #12
JSTFERFUN
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Did a search. Lots of old threads on K&N air filters.

Mixed debate, some seem to swear by them. But shiv did a dyno test and reported 2-3 HP loss!

I'm confused and but may just have to try it for myself.

It is amazing how much has been hashed and rehashed on this board (if you just search).

Take care,

Eric
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Old 04-19-2002, 09:55 PM   #13
BuickturboV6
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Default Just put one in 10K miles....

well... I certainly did not notice a drop or incerase of performance, but what I did notice that the car's is just driving better all around. The car would almost feel like it was weezing when it hit about he 5200 mark until 7200... but after install, I feel a much smoother pull up to redline...

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Old 04-19-2002, 10:03 PM   #14
blarg
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ive seen a lot of posts about people losing power with cold air intakes but not with just a drop-in K&N. I certainly haven't seen a decrease in mine. I think what happens is that most people pull their resonator assembly out, and that disables your ram-air capability from that scoop on the front. when people dyno the car, unless you're simulating 0-60 wind blowing over the radiator into the scoop as you accelerate you don't get a proper measurement, hence the "loss". I fabricated my own dual intake that uses the stock scoop and another scoop in the fender. I have yet to dyno the thing but it doesn't feel like i've lost power...the response is certainly better than it used to be.
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Old 04-19-2002, 10:05 PM   #15
Don Arm
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Default My K & N

I have read the other reports (Vishnu) that the K & N causes a 1-2 hp loss but. My WRX seem's to spool up about 200-300 rpm faster. But ! I do not have any dyno numbers.
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Old 04-19-2002, 10:19 PM   #16
blarg
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i also noticed that most of those reports came from someone who's trying to sell you something.
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Old 04-19-2002, 11:21 PM   #17
Chrisnonstop
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Default Vishnu says it's bad...why?

It's seems to me that if a company that makes it's bread and butter by supplying a HP increase mod could easily add a filter like this to the package and charge a little more. Even if the damn thing didn't work, if they said it did, we'd still buy it. However, they actually said it doesn't work and sometimes hinders performance. Just a thought. I'm not going to mess with my intake at all.
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Old 04-19-2002, 11:51 PM   #18
blarg
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then I guess it all depends on who you want to listen to. K&N GARANTEES an increase and has dyno charts to prove it. Besides, how can changing an air filter make you lose performance? As long as it can flow as much air as the stock paper filter there shouldn't be a loss....now if you're talking about altering the intake itself....i'd agree with you...i KNOW i lost power when i put in a straight pipe with a cone filter....that's why i'm now working on a hybrid system that ADDS another air path to the system rather than replace it.
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Old 04-20-2002, 01:29 AM   #19
JSTFERFUN
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Well, I put the K&N in tonight and maybe it is just my imagination but there seems to be a little more power and it seems to come on quicker. The sound from the intake is definitely louder at WOT. It sounds great!

The filter comes with very complete instructions that has you remove the entire filter box to insure proper seating of the filter. The filter itself is almost see through and clearly will be less restrictive than a paper filter.

I'm happy!

Eric
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Old 04-20-2002, 12:51 PM   #20
Rich10
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When I put my K&N filter in, I thought that I felt a benefit. I then timed several third gear acceleration runs up a long hill with the K&N filter and the OEM filter. There was no difference between the K&N and the OEM filter. The K&N filter probably has no impact on performance, positive or negative.

I have heard some people suggest that it may have a benefit when the OEM filter gets dirty as the OEM filter performance may degrade quicker than the K&N filter. I don't know if that is true.
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Old 04-20-2002, 12:59 PM   #21
DSM-2-WRX
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Ok, it's not like this is the first performance mod that can potentially cause a power loss. If Vishnu did truely dyno a power loss, it may be simply due to having not retuned the A/F characteristics to account for the potential increased airflow. This same situation can be observed with those who install aftermarket IC hoses, and complain of a decrease in power. Remember, tuning is everything! IMO, even if it doesn't increase power, it's a nice product since it's reusable and will save money after a few cleanings.
Mark
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Old 04-20-2002, 01:31 PM   #22
bluescoobywagon
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I'm just thinking that 1-2 hp is .006-.012% (assuming 165 hp to the wheels) That is probably below the accuracy of most dynos and can't be considered more than normal variance. You could see that much hp change from a small difference in tire temperature. Was it tested in back to back runs? If so was the intercooler a little heat soaked? Exactly how many runs and under what conditions was this attempted?

Also keep in mind that as you increase the power of the motor, the air requirements will increase as well and if the K&N had no effect on a stock motor, it would probably have a large effect on a 300+ hp modded motor. The engine can only move as much air as it's smallest bottleneck will allow and eventually, that bottleneck will be the filter.

Mike Robinson
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Old 04-20-2002, 01:51 PM   #23
blarg
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well i just put in my K&N and I at the very least the car sounds a little diffferent. I can actually hear the turbo whine as it spins up and down....freaked me out the first few times because it sounds like a fire engine or ambulance a block away

I've had K&N's in every car I've ever had and I can tell you there IS a difference. THere's also the convieniece factor. I needed to replace my paper filter at 7k....it got REALLY bad....but I was so busy i didn't have a chance to get to the store until i was at about 11k miles....all that time, the car idleded like CRAP annoyed me to death but I still never got home early enough to get to the store before they closed. Now I don't have to worry about it as much. Even dirty a K&N flows at least as much air as a new paper filter, and I never have to buy another one....and I can clean it whenever I have time....

On some cars it made a significant milage difference (older cars), and I can tell you that with this intake i made for my WRX its capable of flowing more air than with the stock filter. anyway, 1-2 HP is probably within the margin or error on most dynos...that's 1%....I'm willing to bet that dynos are not THAT accurate...and even it it was you could generate 1% difference just by raiding the temperature of the air a bit, or the temp. or the engine, or a dozen other things.

the way I see it...at the very worst I pay $40 to never have to think about buying another air filter....at best it might get me a little performance.


also- noone ever talks about throttle response. even if you DO lose 1-2 HP you get lightly better throttle response with the K&N...and I'll give up 2 HP if it'll get me the other 220 a tenth of a second faster.
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Old 04-20-2002, 02:18 PM   #24
dallas_wrx_blue
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Can anybody help me out? I just want to know if I put the K&N filter, will it make daily driving more enjoyable. I drive my car passively most of the time and hate the fact that I have little low-end torque because of the turbo lag. In other words, will it spool up my turbo faster? Thanks in advanced.
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Old 04-20-2002, 03:16 PM   #25
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No, the K&N will not make any "noticeable difference" in low-end torque or spool-up time. The best mods to increase low-end torque include replacing the uppipe and downpipe and installing a lightweight crank pulley and lightweight flywheel. Those are about the only mods that are going to significantly increase torque output or response below ~2700 RPMS (or until the turbo spools up). Even a unichip or boost control will do little, since the engine will operate in closed-loop A/F control until 40-60% throttle position, and like I said, major power boost occurs at full turbo spoolup. Welcome to the world of low cylinder-compression turbo-boosted power.
Mark
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