370Z K&N Dual Air Filter

MC

another option is the HKS hybrid filters for the 370. i got them in the GT-R. they arnt reusable though so every so often you gotta get new ones. they run about $70

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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 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!!!

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-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

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.

semtex

Umm . . . okay. FWIW, I got net gain of 14.7 whp from the Stillen G3 intake, which is why I found your post a little puzzling. Not sure if you've seen this thread of mine or not -> Install of Stillen G3 Intakes complete - review, etc. I have before/after dyno charts, vid, etc. posted in that thread if you're interested.

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Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

Robert_Nash

Not trying to step on anybody's toes here...I'm just relaying what I've been told by people who are in a position to at least have an intelligent opinion on the subject.

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-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

Josh@STILLEN

Robert, you can let them know that they built a hell of a car.. that's for sure!

MightyBobo

Personally, I'd thank them for choking the **** out of the intake and exhaust, making it very mod-friendly

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semtex

Definitely! +1

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

dawankler

If the stock intake and exhaust are adequate for all of the engine's needs how did the Nissan engineers increase the HP/TQ of the Nismo 370 just by replacing the intake and exhaust?

Engineering is a careful balance of a number of factors. In this case with the intake/exhaust design of the stock 370 those factors include price, power, efficiency, exhaust note, emissions standards, and probably 20 others that I'm not thinking of. It's not outside the realm of possibility to believe that engineers sacrificed some power numbers in order to meet one of the other factors. For end users who are willing to sacrifice general publicly acceptable exhaust note, price or efficiency for those extra ponies can find it in these aftermarket mods.

With that said, I agree with Josh. I think Nissan hit it out of the park with the 370. It's got everything your average person would want in a two seat performance vehicle at a price that your average person can afford.

Robert_Nash

Even if I asked; they very likely wouldn't tell me.

Even if they told me, I probably wouldn't be allowed to tell anyone else.

If I did tell anyone else I'd probably (and appropriately) be fired.

So I think it best I shut up now.

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Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

semtex

If I'm not mistaken, the Nismo 370 has the same intake as regular models. I remember reading that the extra hp was achieved with a different exhaust and some adjustments to the ECU map only.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

dawankler

I think I read (maybe incorrectly) that it was a different intake also.

Even with an ECU remapping it just goes to show that the same aftermarket mods he's discounting were used by Nissan engineers to increase power.

Robert_Nash

If you are referring to me, which mods, exactly, are you saying I'm discounting that are applicable to the Nismo 370?

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Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -

semtex

Here's where I read it:

2010 Nissan Nismo 370Z - 2009 New York Auto Show Coverage, New car Reviews, Concept Cars - Automobile Magazine

Funny, the opening paragraph of the article says:

That's pretty laughable. But to be fair, these are Automobile mag's words, not Nissan's.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

dawankler

You're right, I think my mind made a connection with the available Nismo intakes and the production Nismo vehicle. Whoops. I AM now disappointed that my Synchro-Rev transmission doesn't do magic tricks for me

And Robert, in rereading your earlier posts you DID say you didn't think it'd provide appreciable performance gains unless they were in tandem with FI or extreme modifications. I guess it just depends on your price/performance ratios, but there's been a number of posters here with proven gains (10% isn't uncommon so far) by just upgrading the airflow.