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370Z K&N Dual Air Filter
Does the 370Z use the same K&N dual filter size as the 350Z or did the dual air-filter size change on the 370Z?
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I think most will tell you the same thing: dont waste your money. The drop-in filters tend to do nothing but take performance away, and jack up your MAF thanks to the oils in the filters...
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K&N Response to Mass Air Flow Sensor Concerns As far as the original question... I don't know :tiphat: Jim |
As for the original question, why not just go to K&N's website and look it up? They've got a database that lists all the part numbers for each car.
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I can tell you with absolute certainty that the 350 with dual air boxes and the 370 take the exact same filter size; if you have two K&N filters in your 350 you can drop them right into your 370 (I'm not sure about the earlier 350s with one air box; I've never had reason to check into it.
As to whether they reduce performance I think that's a bit of an untested/undocumented theory but for me at least, it sort of misses the point...I use K&N filters because I believe they provide better filtration without overly reducing airflow. Obviously, however, a dirty filter, K&N or otherwise, is a BAD THING so whichever you use, keep them clean or keep them replaced on a regular basis! |
...or get the Stillen G3 intakes for the best of both worlds ;)
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Thanks..I figured the 370Z filter size would be identical to the 350Z. I just will have to go buy a pair as I never yanked them out of the 350Z I previously owned. As for the comment regarding K&N being bad or a waste, I have been using them for 40 years now in Mustangs, Z's, Pickups and SUV's and never experienced a problem but always pickup up positive throttle response in all the vehicular types as well as some dyno-proven RWHP even with the panel ones. So I don't subscribe to the "NO K&N" beliefs.
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Ouch is right!:shakes head:
If you're having MAF issues when using K&N or any washable filter that uses oil, then you're improperly oiling the filter (END of that question). Quote:
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But hey, its your money, spend it how you well - we just found Wix filters filtered just as well and were dirt cheap. Im with the others on saying, just save the cash for a real intake kit, btw. |
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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. :) |
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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. |
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K&n filters do seem more heavily oiled new than what i go for when i re-oil them.
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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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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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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. |
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 -> http://www.the370z.com/intake-exhaus...eview-etc.html I have before/after dyno charts, vid, etc. posted in that thread if you're interested.
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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. :tiphat:
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Robert, you can let them know that they built a hell of a car.. that's for sure! :)
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Personally, I'd thank them for choking the **** out of the intake and exhaust, making it very mod-friendly :)
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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. |
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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. :) |
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.
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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. |
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Here's where I read it:
2010 Nissan Nismo 370Z - 2009 New York Auto Show Coverage, New car Reviews, Concept Cars - Automobile Magazine Quote:
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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. |
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It's not really about intake airflow for the 370z, so it misses the point. |
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I can't speak for Stillen, but from what I've read they've done a fair amount of research into the long tube design. There's some increased (very smooth) flow, Lottsa filtration area, and relatively cool air from in front of the radiator. In addition, the MAF signal is probably altered slightly as the tube ID's are slightly different than stock, resulting in a slight leaning and more power. There are lots of factors, one of which is that most Dynos seem to have been done with the nose off. which enhances the end result some. I've been building airboxes for Audi's for 8 years now so I've got a little experience messing with them. Some of it's science, some of it's luck, some of it's a sympatico relationship between engine designs and the CAI's that work well on them.. |
Mine was done with the nose on, just for the record. ;) +14.7whp on Forged's Dyno Dynamics.
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Thanks for stating it so clearly! :) |
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Is there a wideband showing a/f ratio for these stillen graphs? It could be leaning it out like modshack said. I know from experience that the s/c Cobras can get very lean with the addition of a cai, and in some instances require a retune to be safe.
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