Has this happened to anyone else? The car feels like its struggling under hard acceleration compared to when it had the factory oem filter. I thought K&N was a higher flowing filter. Sure as hell doesnt feel like it.

 

"noticed"

i think thats the key word...
its probly in your head, unless you installed it wrong, or something was f-d up during install...

even if it gave or took away 5 hp, more than likely you won't feel it..

 

Take the plastic wrapper off the filter!

 

Would'nt placebo cause me to think or believe that i actually feel more power, being that the k&n is suppose to be a higher flowing filter? It actually feels more restrictive now. I've read somewhere that the oil in the filter can cause it to be more restrictive when new.

 

What model butt dyno do you have? It seems pretty sensitive to detect such a small change.

 

you have a rare case of negative placebo..............

or you blotched the install and you really are getting negative hp gains? so check that..but i cant imagine how you could.........then again, ive seen some crazy things done out there before............

I mean, if you just dropped it, then its probably broken.....lol...j/k...

-J

 

If you want, reset the ECU. I doubt this will do anything and I think you're probably seeing more from changes in the temperature outsde than you ever would from changing out that filter.

An even less likely scenario is that some oil got on your MAF sensor. You could try cleaning it.

 

Are you sure you purchased a real K&N, or one of those knock offs? Seriously though, you shouldn't feel any power loss at all. Did you try to do ECu reset? What other mods do you have on your car besides the K&N drop in? All these factors will affect on how your Z respond to the filter. If you have just a drop in with no other mods, just a filter isn't going to give you any gains, if at best, +2 hp. You have to look at it this way. You replace OEM with high flow (intake side), but you still have OEM exhuast components(exhaust side), and that might be the restriction you felt as the power loss. Look for an aftermarket system if I were you......

 

 

DAMN THOSE SENSORS.... hahahaahahha!!!!

Next thing he's going to tell you to do is take it to autozone!!!

 

just pop the OEM one back in and go for a test run to see if there really is a difference. would've solved your problem faster than making a new thread and waiting for the right reply back.

 

A person won't really be able to tell if you got gains or not. From a drop in, im sure most of the members in here including me will not be able to feel it. If you in fact have a KN, it will most likely help more with the cooling aspect rather than performance itself. If you want to be sure if you got any gains, then you will have to drop est 100-150 dollars for a dyno.

 

Try resetting the ECU...
If that does not work follow ARK's recommendation and drop the OEM back in.

 

Remember....higher flowing is only effective if you are out flowing your stock filter (Such as with FI). And unless you have the Stillen SC you wouldn't be using your stock airbox anyways. My point is. Stock motor, stock airbox, with no FI, stick with OEM filter. You aren't going to out flow it. All you are gonna do is suck in dirty air since aftermarket filters filter less, that's how they claim "higher flow".


read this.......http://www.bobistheoilguy.com/index....d=61&Itemid=70


And this........http://www.bobistheoilguy.com/index....d=66&Itemid=76

Pay close attention to the flow comparison #s in the flow test link. I realize it's a different engine then we have. But we also have a MUCH more efficient factory airbox then most other cars. So i'd expect if the same test was done using a Z, the difference between the filters tested would be even less!

I'd rather have cleaner air going into my motor. Take out your K&N filter and hold it up to the light. Check out all the holes in it!!

 

we did a test together w/ invision performance back a couple years ago. dont have the data but i remember Apexi power filters came in pretty high w/ airflow and filtration over other aftermarket filters. but as halfass872 said, the aftermarket filters filter less to allow more air in and the oem ones are usually the most restrictive because they filter the best. its like putting a shirt over the intake piping compared to using a nylon stocking.

 

ahaha. this is the same guy that put mobil 1 in his car and said the car feels like new. I think he got ragged on hard enough in that thread that the negativity is spreading to the K&N drop in filter.

https://my350z.com/forum/engine-and-...feels-new.html

 

I had the K&N panel, an used 350z panel, Stillen cai and a new oem. The K&N, Stillen and the new oem all felt about the same. The only thing that made a difference was the dirty oem Z filter. THAT one felt sluggish. This also mirrors Hydrazine's observations about oem filters flowing and filtering well but losing flow when they get dirty.

 

I had the Exact same results. I went from popcharger, to 2006 airbox with K&N drop in, to Amsoil Drop in, and then to OEM Drop in. The OEM drop in felt sluggish as well. I couldn't tell a difference between the K&N and the Amsoil. So i stuck with Amsoil since it's dry and more then likely filters better then an oil gauze filter.

Although I'm still a little skeptical because i'm FI and flowing alot more air through the factory airbox then a NA motor. So IMO i still think the three drop in's probably flow close enough to the same that they shouldn't be noticeable to the butt dyno.