K&N Air Filters Added to Stock Air Boxes??
 

I am probably going to add the JWT cold air intakes (pop chargers) when I hit 10k miles along with a Nismo cat back. In the mean time, has anyone seen any improvement with adding K&N filters to the stock boxes? I have a 2013 w/7 SP AT.

........... or ask your Mom.:tup:

Dyno proven to give you 5hp over stock with the drop in filters

Stay away from the NISMO cat back, go with aftermarket like fast intentions instead

Next time use the search feature as these questions have been answered 100's of times already, hence the smart *** answers from others

You need the silicone hoses too in combination with the filters. You get a small gain in HP/tq. You don't feel added hp, but you can feel the torque, also a significant improvement in throttle response. The best part about that set up is the small bump is throughout the range 1500-7000rpm. so you're using your little 5-8hp whenever you need it. Not just at mid/high rpm's.

I almost did the JWT with silicones, but i feel the jwt is to high up in the engine compartment. You'll be sucking in hot engine air, not fresh outdoor air.

oh and dont forget to put in a couple of these... :tup:

Tornado Air :: More Power, More Mileage!



:ugh2:

I have 6 of these in my car. I am getting better gas mileage than Prius and beating Aventadors left and right! Best investment I have ever made! :tup:

:tup: dayam.. i heard if you put them in the exhaust it acts like a turbo. can you confirm that?

K&N
 

unknown370? What is this "silicone hoses", to go with the drop in K&N air filters?
I looked on K&N's website, but only saw the cold intake with aluminum tubes.
Thanks

There is nothing wrong with a Nismo exhaust on a base model for an upgrade. Allot cheaper then the other aftermarket alternatives. Sounds, looks, and performs better over stock set up. Not huge by any means but I curtently don't have thousands to spend.

I'm also going with drop in k&n filters and tubes.

With no other changes I got 6 or 7 WHP.

Same dyno, did a pull, swapped filters, did another pull.

(New) Factory Nissan filters.

You don't need the tubes to see gains.

Oh, and the Nismo cat-back, assuming you mean off of a Nismo 370, and not one of their 'S-Tune' or whatever exhausts, is good for another 10-15 WHP.

If you can get one cheap (Sub $500) then you're getting the best bang for buck, by far.

Just that exhaust + drop ins will get you close to 295whp on most Dynojets, after the car has had some time to run in the learned fuel data.

I have this set up in my Z. My numbers are similar to everyone else that has the same or similar mods with an UpRev tune. My whp would be higher if I didn't install M-370 manifold, but my tq number would not be has high. It's the best way to go if you are looking to save money on increasing your performance IMHO.

The NISMO exhaust is only worth about 7-8hp over stock. It costs only a few hundred less than fast intentions but doesn't give the same 15-18hp that fast intentions does. Again, this has been discussed and dyno proven in the past. I'm not saying the NISMO exhaust is horrible; it's well made and does perform better than stock. What I am saying is that for the money spent there are better options. My stock NISMO exhaust is hanging in my garage while my fast intentions is on my car. Sounds better, lighter, and performs better.

Remember, the NISMO exhaust isn't the only thing giving the NISMO extra power, there is also a better tune and higher rev limit. Those who did the swap but in 2009 when the car first came out only say 7-8hp gains on a stock regular 370z.

This is all pretty much false.

Rev limit identical, tune has slightly different base fuel table data that is tuned out as soon as the car learns fuel data. The exhaust is the only mechanical (engine) difference between the 332hp base Z and the 350hp Nismo Z. The exhaust is good for over 15+ WHP, if tuned or given time for the engine to adjust.

The exhaust is a great option if you don't want to spend too much money.

Buying it NEW is dumb, buying it used for cheap, is very very smart.

If you're going to buy intakes later, why spend the money on new filters now? What's the point?

Yes, worth it. Agreed on the smooth tubes to compliment, but you will still see gains without them.

From two different 370's of mine: first is a 2010 comparing K&N vs paper filter only; second is a 2011 comparing K&N+Cobb tubes vs paper filter.


http://www.the370z.com/members/jordo...ed-comparo.jpg


http://www.the370z.com/members/jordo...ed-comparo.jpg


Eventually I will be trying a set of the pop chargers, which have nice built in velocity stacks -- HOWEVER, this will be in conjunction with custom made fiberglass airboxes. This will be a late summer project, so expect no updates before mid July.

There's nothing wrong with the Nismo exhaust as an upgrade from OEM IF you can pick it up on the cheap (say < $550 shipped; < $350 picked up)

First part isn't quite right, at least based on about a dozen or so Nismo vs comparably modded/tuned non-nismo Z's I've seen dynos for. The fueling and spark profile will not adapt to match the Nismo's without tuning.

Also, I thought the Nismo does have a slightly higher rev limit as well -- I could be wrong on that one.

I also remain convinced that the Nismo has slightly different VVEL tuning as well -- although that is yet to be confirmed (hello, GTM?) -- after viewing these dynos I've been accumulating from various folks (all dynojet, BTW).

However, I agree 100% that picking up any Nismo exhaust new is not needed -- get one used for modest gains and good sound without any unexpected rasp or fitment issues.

Responses in bold.

It looks like your data points are taken at different RPM levels between the 2 dyno charts , if this is so, it will give you a lot different readings if you measure your HP at 4000 rpm compared to 4200 rpm.

Why would you base it all on one data point?

If you gained 10 whp in the middle and 3 at the peak, would you say the car only gained 3 whp?

Actually you would.


But of course all of us on this forum know...... area under curve counts just as much if not more for driveability.

Showing a 2 different graphs to represent HP gains, with different data points on each graph does not provide accurate data, unless you were to overlay the 2 graphs or plot the data points on 1 chart.

If a car makes 200 HP at 4000 rpm. in one chart and in another chart it makes 210 HP at 4200 rpm , you can 't say there was a 10 HP gain between to 2 charts.

Data points between the 2 charts must be identical in order to illustrate an accurate comparison.

Those data are from the same car in each graph -- not comparing two different cars. The overlay is before and after a given set of mods. Selected points are just showing where greatest gains were. :confused:

I'm not making a case for a mean gain of x at datapoint y, I'm showing that a humble change of a filter does indeed net gains throughout the rev range, as shown on two vehicles for which I have data on hand. There's too many transient variables that may affect the magnitude of change at a specific location in the rev range. That we see gains throughout the rev range -- albeit at different points -- on two units is generally good evidence that high flow filters make a positive improvement. Comparing the same car at the same point before and after still provides useful information.

That car A gained 3 whp at 3500 RPM whereas car B gained 5 is not really the issue -- we have no specific hypotheses about that, and again there are too many transient modifiers that will influence things.

Anyway, one shows gains from filters alone the other shows gains from a combo of filters and tubes. The filters alone netted about a 2% gain at 5252 RPM (or as close to it as I could align the cursor) and with both the gain is about 4% when hp and torque are equal.

Here they are again with a single selected RPM point -- 5252 RPM (or as close to it as I could align the cursor)-- for comparison... same day too.

2011 Z

http://www.the370z.com/members/jordo...-k-n-panel.jpg

2009 Z

http://www.the370z.com/members/jordo...n-vs-paper.jpg

Interpret these data as you will...

It doesn't have a higher rev limit but peak HP expands from the regular Z

Z= 332hp @7,000rpm
Nismo= 350hp 7,400rpm

Buying the exhaust separately from Nismo, they claim 5-8hp gain with their exhaust. Not sure if i can float with Nismo getting all their power solely from an exhaust considering their claims on the independent exhaust

NISMO Exhaust System 370Z - B0100-1EA25 - Nismo

That's the shitty 'S-Tune' exhaust system.

We're talking about the Nismo OEM exhaust, which is good for well over 10WHP in most cases.

confirmed!

Oh sweet! Gotta do this mod ASAP!:tup:

Hmm. Well, I've had the S-tune previously (about 3-4 whp) and will be bolting on a Nismo take off in July so I'll post before and after results in a few months.