K&N Drop-In Filters

Jordo! · 07-03-2010, 03:16 PM

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!

6spd · 07-03-2010, 04:54 PM

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.

atl370z · 07-03-2010, 04:56 PM

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

flashburn · 07-03-2010, 05:20 PM

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.

Jordo! · 07-03-2010, 06:37 PM

Quote:

Originally Posted by atl370z

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

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.

atl370z · 07-03-2010, 06:54 PM

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

atl370z · 07-03-2010, 07:08 PM

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

Quote:

Originally Posted by Jordo!

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.

6spd · 07-03-2010, 10:16 PM

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

Cmike2780 · 07-03-2010, 10:28 PM

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.

atl370z · 07-04-2010, 12:29 AM

There you go,

Quote:

Originally Posted by Cmike2780

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.

daisuke149 · 07-04-2010, 11:28 AM

Quote:

Originally Posted by atl370z

There you go,

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

Cmike2780 · 07-04-2010, 10:57 PM

Quote:

Originally Posted by atl370z

There you go,

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.

6spd · 07-05-2010, 08:41 AM

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

Modshack · 07-05-2010, 09:19 AM

Quote:

Originally Posted by 6spd

^^ 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)

6spd · 07-05-2010, 11:06 AM

oh yeah, no doubt.

07-03-2010, 03:16 PM	#46 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	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! __________________ Enjoy it. Destroy it.

07-03-2010, 04:54 PM	#47 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	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. __________________ -Jay- jonathanjamesphotographer.com

07-03-2010, 10:16 PM	#53 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	well thats peak hp, the dyno chart would reveal the larger gain areas for sure. __________________ -Jay- jonathanjamesphotographer.com

07-03-2010, 10:28 PM	#54 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 28	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. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

07-05-2010, 08:41 AM	#58 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	^^ I agree. Dyno charting is far from an exact science in most conditions. __________________ -Jay- jonathanjamesphotographer.com

07-03-2010, 04:56 PM	#48 (permalink)
atl370z Enthusiast Member Join Date: Apr 2010 Location: atlanta Posts: 282 Drives: Maxima Rep Power: 15	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

07-03-2010, 05:20 PM	#49 (permalink)
flashburn A True Z Fanatic Join Date: May 2009 Location: Central Florida Posts: 1,884 Drives: '12 Corvette GS 6M Rep Power: 18	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.

07-03-2010, 06:54 PM	#51 (permalink)
atl370z Enthusiast Member Join Date: Apr 2010 Location: atlanta Posts: 282 Drives: Maxima Rep Power: 15	I don't have the stock filter anymore, but something is for sure. I did not get more than 5hp gain.

07-05-2010, 11:06 AM	#60 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	oh yeah, no doubt. __________________ -Jay- jonathanjamesphotographer.com

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