they make a frickin mess from what I remember.

That's what she...

ha, i lol'ed at that

:inoutroflpuke::roflpuke2::bowrofl:

Zing! :icon17:

Oh, BTW, I went back to more carefully scrutinize those dynos in the other thread --

While mean gains after 3.25K were just under 5 whp/wtq, peak gains were as high as 10 whp/wtq! That's insane for just an air filter!

oh yeah, they are very good for just filters. a throttle response change is commonplace because of the lowered restriction, but actual HP over the entire rpm range, thats a total bonus.

Just got back from dyno today. Did three pulls and here are the results.
1st 279hp
2nd 278hp
3rd 279hp

My car is bone stock with only k&N drop in.
All the other stock 370zs put down average around 275hp and 277hp.
But, there were another bone stock 370z put down 279hp on one of the pull though.
I am not sure if I actually get any gain from the k&n drop in:confused:

Why would you not just swap out filters while it's already on a dyno? Do you not have the stock filters anymore? You can't just blindly compare other people's dyno results to yours, it doesn't work that way.

Yeah... do you still have the paper filters on hand? I'd re-do that if you have the time and extra cash...

Also, just curious, but how much torque? They didn't give you a dynoplot?

Oh, and auto or manual? There's not much difference between the two on the dyno, but certainly enough of a difference to obscure the impact of a higher flow filter.

I don't have the stock filter anymore, but something is for sure. I did not get more than 5hp gain. :tiphat:

my car is a 09 manual with 4k miles. the torque dyno results are:
1st 236.71
2nd 236.98
3rd 237.36

if these helps

well thats peak hp, the dyno chart would reveal the larger gain areas for sure.

Any increase would make it a worthwhile investment given that it doesn't cost all that much. If it gets even a third of the gain from a Stillen G3 intake, it's done it's job. You really can't compare your result with other Z's. Like you said, other stock Z's put down different numbers. Your stock setup could have been one of the low numbers and gained a few with the drop in's. Post your chart if you can.

There you go,
http://sphotos.ak.fbcdn.net/hphotos-..._6130156_n.jpg

i shoulda taken pictures of mine too. : ( i still dont have them in my e-mail.

Thanks for posting the chart. Nothing really jumps out. I could be mistaken, but most of the stock Z's usually peak @ around 275-276 hp. I think thats what Stillen uses as a baseline. Still worth it in my book. With a 4hp gain it's around $20/hp compared to around $72/hp (18hp) for a Stillen CBE & $ around 30/hp for the Stillen Gen3 CAI (17hp).

I've seen Dyno runs with the G37 hitting 288hp so this whole post is most likely moot. Conditions need to be exact to have acurate comparisons. Even then, you have variations. Just goes to show how we should treat Dyno charts with a grain of salt.

^^ I agree. Dyno charting is far from an exact science in most conditions.

and 5hp is well within expected variances from run to run (with no changes)

oh yeah, no doubt.

Shhhh!

i dyno'd higher in stock form!

let me bask for a little longer!!

j/k lol.

I'm sold.. :)

Check out my dyno -- I picked up power through the rev range, although the magnitude varied over sucessive runs, those two clearly show some solid gains.

http://www.the370z.com/south-east-re...se-thread.html

That's awesome work Jordo! +Rep

In stock form, I dynoed 280whp peak. I hope I can peak at 285whp with a set of these filters.

Just make sure you have the car at approximately the same operating conditions -- the more they diverge, the harder it wil be to interpret results...

They are a waste - i have two for sale..used for 1 day.

Just take a huge dump and leave your spare tire at home...you'll gain more relative power with the diminished weight than you will with stupid drop-ins.

so scientific. do you have dyno results.

A few whp can easily change due to intake temps. My first set of runs (with K&N installed) after driving down to the shop with no real cool down (less than 5 min), I made less power relative to both K&N after a 15 minute cool down or paper filter with a 15 minute cool down.

Allowing for equal cool down time, the K&N filters clearly made a bit more power than OEM, as was most evident comparing the first run for each post-cool down session.

It's entirely possible someone could dyno with a hotter car and see a loss that would incorrectly assumed t obe due to the K&N filters.

Failing that, I have to assume other transient factors like overoiling (can come from K&N overoiled!) or erratic fueltrim corrections --- the K&N's should simply flow better, so it would be weird to lose power even if you didn't gain.

drop ins
 

Just curious, is there a noticeable sound difference when using the K&N drop ins over the stock filters?

barely

:icon18: Lol, I second that!!

Actually, I came into this thread about that. I'm pretty shocked because they did make a difference. The motor doesn't sound so wheezy and strained anymore, it actually sounds lower pitched - more like the 350Z did. I swapped the OEM filters back, and the wheezy/high pitched tone came back (this is very evident to me in lower RPMs). I put the K&Ns back, and the tone changed again.

So if you don't like the sound of the motor and are looking for a quick change, definitely drop these in - they make just the right improvement in sound.

There's a teeny bit improvement in power, but it's mostly low-end and you have to be pretty sensitive to feel it.

Or remove passenger seat.. the thing weights like 40 pounds...

Or stop being fat...

Thanks for the response Arnold, I'll pick some up!

They Work
 

Picked up a pair of K&N drop-in filters over the weekend. I can only speak for my completely stock 307Z (except for dynamat extreme and second skin). Results were immediately noticeable; better throttle response, more power, louder but deeper exhaust sound. How much of a difference? Not that much but definitely well worth the $120 Pep Boys investment.
Happy driving!

ill add to this thread.i have the tb's bypass and the k&n drop in filters.before i put them in, i blew all the oil out of the drop ins with a air hose,quite a bit i might add too.i also deleted the plastic resonators on both intakes using a 90 degree pcv elbow.i had to get some more hose for the passenger side because the stock hose was just not going to work.

did the same thing to the drivers side except i was able to keep the oem hose coming off the valve cover.keep in mind i also have a muffler delete before i did this.my review is i did feel more response and more power doing it this way.of course i will be putting on the z1 tubes when they come in for maybe a tad more power who knows.

it will look alot better though.case in point.if you do not blow the oil out of the filters prior to install ,then dont expect too much.

Thanks a bunch, paid 101 shipping included, saved me 10 bux :)

Just picked up two of these from Advance Auto Parts for $89.03 shipped using code DOTW42.

Buy K&N Panel Type Cotton Gauze Air Filter 33-2399 at Advance Auto Parts

:)