370Z K&N Dual Air Filter

Robert_Nash · 06-18-2009, 12:46 AM

With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects.

As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle.

ZKindaGuy · 06-18-2009, 02:52 AM

Quote:

Originally Posted by Robert_Nash

With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects.

As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle.

Notwithstanding your forced induction reference, lots of folks don't understand the air flow dynamics involved and the importance of the point you are raising.

With a cold air intake kit, a person can put it on the car but likewise if they don't upgrade to a less restrictive exhaust as well at the same time then they are not going to see the benefit that can be had from adding the CAI as it works in conjunction with the entire exhaust.

For me, I just want the less restrictive intake airflow the dual K&N type panel filters bring to the table as with the 350Z I once owned it made a word of difference with the throttle response. From a HP perspective if I gain a few by dropping the panels in thats nice but I have reached the lifestage in my life that I no longer have a "more HP" addiction.

semtex · 06-18-2009, 09:08 AM

Quote:

Originally Posted by Robert_Nash

With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects.

As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle.

Come again, Robert? So the measured gains people have seen on the dyno from the Stillen G3 intakes are what? A complete fiction? Or am I not understanding you?

Robert_Nash · 06-18-2009, 10:20 AM

Quote:

Originally Posted by semtex

Come again, Robert? So the measured gains people have seen on the dyno from the Stillen G3 intakes are what? A complete fiction? Or am I not understanding you?

Let me state for the record that I'm not an engineer or mechanic or anything close; my expertise is accounting, finance and IT.

BUT...

I have learned to realy on people that are engineers and mechanics when it comes to engineering/mechanical issues (and I have on numerous occasions stayed at Holiday Inn Express hotels).

SO...

I've had conversations about this very issue with both Nissan engineers and with Doug Stewart (Doug owns Crawford Z Car Service in Nashville and has made his living repairing and racing Zs and Nissans in general for over 30 years; his shop is also were we [Nissan] takes vehicles form the heritage collection for work. I won't advertise his website here but Doug has developed many performance parts for Zs including, of course, the 350 and I can only assume he is working on parts for the 370) and as Doug's shop sells and installs intake kits he has a vested interest in encouraging their use.

So with that said and after that long introduction...what Doug and Nissan engineers have told me is what I mentioned above; that the air box set-up on the 350/370 is more than adequate to feed the engine all the air it can handle in anything near stock form and using a low restriction air filter is as much of an increase in air flow as the engine can use/need.

Certainly, if you are going to start dong major modifications that will give the enging a greate need/ability for air then that's a different equaiton but putting an intake on the stock engine does not get you anything; at least not enough of anythign to justify the expense.

Now; I've nothign against intake kits and they do add a nice look to the engine and most people, including me, think they give the intake a nice "sound" but if you are lookinf for a measurable HP/Tq increase it seems that there are better ways to spend your money.

Disclaimer: nothing I've said above should be construed as offering mechanical advice nor is it the official position of Nissan North America or Nissan Motor Limited; no warranty is either expressed or implied...you sould should consult professionals in your area who can evaluate your specific circumstances...Live Long and Prosper!!!

dad · 06-18-2009, 05:02 PM

Quote:

Originally Posted by Robert_Nash

Let me state for the record that I'm not an engineer or mechanic or anything close; my expertise is accounting, finance and IT.

BUT...

I have learned to realy on people that are engineers and mechanics when it comes to engineering/mechanical issues (and I have on numerous occasions stayed at Holiday Inn Express hotels).

SO...

I've had conversations about this very issue with both Nissan engineers and with Doug Stewart (Doug owns Crawford Z Car Service in Nashville and has made his living repairing and racing Zs and Nissan's in general for over 30 years; his shop is also were we [Nissan] takes vehicles form the heritage collection for work. I won't advertise his website here but Doug has developed many performance parts for Zs including, of course, the 350 and I can only assume he is working on parts for the 370) and as Doug's shop sells and installs intake kits he has a vested interest in encouraging their use.

So with that said and after that long introduction...what Doug and Nissan engineers have told me is what I mentioned above; that the air box set-up on the 350/370 is more than adequate to feed the engine all the air it can handle in anything near stock form and using a low restriction air filter is as much of an increase in air flow as the engine can use/need.

Certainly, if you are going to start dong major modifications that will give the enging a greate need/ability for air then that's a different equaiton but putting an intake on the stock engine does not get you anything; at least not enough of anythign to justify the expense.

Now; I've nothign against intake kits and they do add a nice look to the engine and most people, including me, think they give the intake a nice "sound" but if you are lookinf for a measurable HP/Tq increase it seems that there are better ways to spend your money.

Disclaimer: nothing I've said above should be construed as offering mechanical advice nor is it the official position of Nissan North America or Nissan Motor Limited; no warranty is either expressed or implied...you sould should consult professionals in your area who can evaluate your specific circumstances...Live Long and Prosper!!!

Well, they've worked on nothing but Nissan's for thirty years, and Nissan's are all they work on. I'd accept their word , before a lot of other companies! A friend of mine who lives in Clarksville, took off his intake, and went back to stock. He stated that the sound was great, but no performance benefit.

Josh@STILLEN · 06-18-2009, 10:28 AM

Quote:

Originally Posted by Robert_Nash

With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects.

As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle.

While Nissan has definitely built a great platform, there are gains to be had from aftermarket products, including the intake system, our Gen 3 Intake having notable success in increasing horsepower, and making a noticeable improvement in acceleration along with transforming the sound from the intake, especially at high RPMs.

A quick search of the forums for dyno results on the Gen 3 Intake should give you some independent results from forum members here, some of whom have spent a small fortune for the good of the boards documenting their installs and resulting performance gains.

On the K&N side, we've been using these filters with our intake systems since the beginning, and sold countless panel filters, and have had exactly ZERO problems related to MAFs, oil, etc. K&N has been hit with a myriad of claims, most of which can be attributed to 'internet rumor', so much so that they set up a division and research arm within the company to attempt to combat these (largely unsubstantiated) internet claims.

Also keep in mind that normal cleaning procedures for panel filters is 50,000 miles, and conical filters used with air intakes is 50,000-100,000. We recommend 50,000 miles between cleanings. Even if gains are minimal on a panel filter, the convenience of not purchasing paper filters more than offsets the cost of the K&N, and in actuality, probably the Gen 3 Intakes if you consider the life of the vehicle.

ZKindaGuy · 06-18-2009, 09:45 PM

Quote:

Originally Posted by Josh@STILLEN

While Nissan has definitely built a great platform, there are gains to be had from aftermarket products, including the intake system, our Gen 3 Intake having notable success in increasing horsepower, and making a noticeable improvement in acceleration along with transforming the sound from the intake, especially at high RPMs.

A quick search of the forums for dyno results on the Gen 3 Intake should give you some independent results from forum members here, some of whom have spent a small fortune for the good of the boards documenting their installs and resulting performance gains.

On the K&N side, we've been using these filters with our intake systems since the beginning, and sold countless panel filters, and have had exactly ZERO problems related to MAFs, oil, etc. K&N has been hit with a myriad of claims, most of which can be attributed to 'internet rumor', so much so that they set up a division and research arm within the company to attempt to combat these (largely unsubstantiated) internet claims.

Also keep in mind that normal cleaning procedures for panel filters is 50,000 miles, and conical filters used with air intakes is 50,000-100,000. We recommend 50,000 miles between cleanings. Even if gains are minimal on a panel filter, the convenience of not purchasing paper filters more than offsets the cost of the K&N, and in actuality, probably the Gen 3 Intakes if you consider the life of the vehicle.

And please allow me to add to this that if by chance some oil does get on the MAF wire. Just buy a $3.00 can of either MAF cleaner at NAPA or a can of electronic circuit board cleaner and spray the wire IN-SITU and let it dry naturally by air thoroughly . It takes all of 10 minutes to "wash" the oil off and everything will be back to normal.

Philipp · 10-19-2009, 08:45 PM

Quote:

Originally Posted by Josh@STILLEN

While Nissan has definitely built a great platform, there are gains to be had from aftermarket products, including the intake system, our Gen 3 Intake having notable success in increasing horsepower, and making a noticeable improvement in acceleration along with transforming the sound from the intake, especially at high RPMs.

A quick search of the forums for dyno results on the Gen 3 Intake should give you some independent results from forum members here, some of whom have spent a small fortune for the good of the boards documenting their installs and resulting performance gains.

On the K&N side, we've been using these filters with our intake systems since the beginning, and sold countless panel filters, and have had exactly ZERO problems related to MAFs, oil, etc. K&N has been hit with a myriad of claims, most of which can be attributed to 'internet rumor', so much so that they set up a division and research arm within the company to attempt to combat these (largely unsubstantiated) internet claims.

Also keep in mind that normal cleaning procedures for panel filters is 50,000 miles, and conical filters used with air intakes is 50,000-100,000. We recommend 50,000 miles between cleanings. Even if gains are minimal on a panel filter, the convenience of not purchasing paper filters more than offsets the cost of the K&N, and in actuality, probably the Gen 3 Intakes if you consider the life of the vehicle.

Lots of interesting comments on that topic.

So I decided to test the K&N drop-in filters to the Dyno shop tonight and do a simple comparaison test versus the stock filters. I will upload the sheets as soon as my %?&*" (slow) internet connection is done downloading them...

All runs were done without any changes to the car (besides the drop-ins) and were taken less than 20 minutes aparts on a DynoPack about 2 hours ago.

We did 4 runs on stock and 4 runs with the K&Ns.

Philipp · 10-19-2009, 09:03 PM

Here they are on run #3 comparaison:

Philipp · 10-19-2009, 09:06 PM

ps. Can someone tell me how to insert the image instead of having attachments???

I will also send WHP sheets...

Philipp · 10-19-2009, 09:17 PM

Although the numbers do show a gain thrughout the RPM band, i couldn't feel any difference coming back home at WOT.
That being said, the engine "seems" to flow more fluently (especialy during downshifts).
Question for the techs folks: could the K&N oil affect the maf sensors and therefore changing the air/fuel ratio??? The filters were "out of the box"...

drisko · 04-21-2010, 11:35 PM

Quote:

Originally Posted by Philipp

I did the same (using K&N) on my previous cars and had no issues. My goal was to confirm if there was any gains or loss over the OEM air filters. Here's the charts on torque numbers (runs #3 & #4).

Awesome job on doing that test. 4 runs on each should leave no doubt that the filters do improve performance.

Just out of curiosity, how many miles or how dirty were the stock air filters used in this test? I assume you got the K&Ns brand new?

Philipp · 04-22-2010, 06:37 PM

Quote:

Originally Posted by drisko

Awesome job on doing that test. 4 runs on each should leave no doubt that the filters do improve performance.

Just out of curiosity, how many miles or how dirty were the stock air filters used in this test? I assume you got the K&Ns brand new?

Drisko,
Good question, the stock filters were actually in good shape (besides a couple of bugs....). And yes, the K&N's were out of the box brand new!
ps. After 9k they still run fine and no issues with MAF...

kannibul · 11-02-2009, 08:06 AM

Quote:

Originally Posted by Robert_Nash

With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects.

As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle.

LOL...OK.

No, there are no performance gains from a G3 intake...none at all...lol

06-18-2009, 12:46 AM	#1 (permalink)
Robert_Nash Track Member Join Date: Jan 2009 Location: Middle TN/Savannah GA Posts: 762 Drives: '14 Q60IPL/'14Armada Rep Power: 19	With regards to aftermarket intake kits; unless you are doing some forced induction or something similar; the only thing an intake kit will do for you is look good and may give you some nice sound effects. As far as engine performance goes; it's my understanding that the stock air box set setup provides all the airflow that the engine can handle. __________________ Robert -My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

10-19-2009, 09:17 PM	#11 (permalink)
Philipp Base Member Join Date: May 2009 Location: Montreal Posts: 189 Drives: 370z SP MT Titanium Rep Power: 18	Human feedbacks... Although the numbers do show a gain thrughout the RPM band, i couldn't feel any difference coming back home at WOT. That being said, the engine "seems" to flow more fluently (especialy during downshifts). Question for the techs folks: could the K&N oil affect the maf sensors and therefore changing the air/fuel ratio??? The filters were "out of the box"... __________________ 2009 370z, MT & Sport package. DynoPack (stock): 268.8WHP & 224.4 Torque//K&N filters//Air cabin filter//HPS Tubes//Tune to come when VVEL...

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