No this is not a which CAI/short ram/etc. is best topic. I'm just wanting to make sure I'm understanding what I seem to be reading. I have a 2008 and it's sounding to me like 06+ it's best to stay stock or stock + drop in filter like K&N or you actually lose HP?

I had been planning on the Stillen long kit after reading the JWT's I planned on had problems from poor heat shielding. I saw a few posts that sound like those will also kill some HP and maybe the Injen CAI's might work, though of course that's a lot more work to install (not that I mind).

Anyway, if the stock airbox thing is true looks like I just saved myself a few hundred that could go towards an exhaust kit instead. Sure I'd love the sound of an intake but not at the expense of power, that's just silly.

 

the injen cai makes power.

supposedly the latest stillen (gen 3?) long tube makes gains as well.

stock boxes are nicely designed. k&ns are a waste.

 

the best thing to do is get rid of the intake box and tube and get a cone filter and connect it directly to the throttle body

 

Eh sorry, somehow I missed the multi-page CAI ripoff post that was 5-6 posts down when I made this. Guess I was too busy searching on 2007 intake and on 2008 intake and missed it. It sort of 1/2 answers my question but it sounds like nobody knows for sure overall on some of the models. I was just trying to make sure I didn't spend $400+ just to lose HP. I'm new to the world of modifying cars like a Z where it sounds like stock components actually work well. I'm used to the 4 banger world where ripping out the convoluted stock box and 1/2 ton of baffling and replacing it with a SR/CAI is nearly guaranteed to get you something.

 

What it boils down to is that the stock air box is very good. In the 06+ models they have a built in velocity stack which is the only improvement over the previous air boxes. JWT has a flowstack...I am guessing any intake that has some sort of flowstack and does not increase the length of the CAI will produce some sort of gain over the 03-05 stock airboxes. Most aftermarket intakes do not have a velocity stack. Some have longer CAI tubes (creating loss). The gains when they are created, are small, usually not worth messing with, for example, the JWT IMO washes itself out with heatsoak. Me personally, if I do upgrade, it will be an 06+ stock w/velocity stack.

 

Thanks, that's what I needed to hear I had read the 06 box was the best, for that year. I just couldn't find a post saying those same improvements in the 06 were transferred over to the dual intake setup of the HR engines. I mean, it would seem obvious that they would have been, but I didn't want to assume.

 

I do not have verified tests showing OEM intake versus aftermarket intake gain or loss. No one does.

 

I have a post in my stats you can search ( car runs like crap) ...
Im in Arizona so heat is a huge issue.

I had a JWT cone intake.

I replaced it with the factory box AND factory style filter..and wouldnt ya know it.....now the car ran awesome . I do have other bolt ons...really smoothed the car out, better idle, better sound ( HKS is loud enough back there) and the torque response is a butt-dyno POSITIVE. There is no mistake, it made GOBS ( no numbers, but a serious difference) more low and mid range power than my JWT. But thats my car.

So i droppedin a K/N filter, stock air box... idle was OK , but that torque was immediately gone. Took the filter back to the store for a refund. Immediately felt the low end torque back on deck again. I fi had a turbo, cone filter would be a must and I hear Injen is the one.. .but for my NA car.. I dont see the need.

Just my 2 cents... as strange as it seems, I have indeed gone back to the stock air box and plan on stayin that way. My friends 911 doesnt have a goofy intake filter, it has an airbox. So does a 360 Ferrari. I mean, if its made well and you havent changed someting that will skew the volumetrics of your engine ( displacement, Nitrous, turbo) its just fine, and ours was made pretty darn good.

 

Hi. I'm no one. Here's my comparison:

Injen intakes instelled after exhaust and HFC.

10HP/10TQ from 6250-7250 RPMs.

How much of your driving time will you spend in that RPM range? Sounds great though from about 4k RPMs and up.

Yes, I'd do it again...

 

Just out of curiosity........was the car re-tuned after each mod?

 

I don't think so.

 

what he said


but i don't think stillen makes the long tube intakes for the 350-hr, only for the 370. at least that was the case the last time i checked

 

Why do people still mention heat soak? It only applies to cars that sit still, once you move, it's a moot point.

 

Ah I see this thread is back. Well, for the moment I am staying stock airbox. Eventually I think I'll be moving to the Injen CAI. The closest Bassani dealer I could find in my area mentioned they had a blog site with dyno tests for both the bassani and the Injen on it. They did find actual real gains with the Injen http://www.zcarblog.com/2008/11/26/p...o-figures.html

EDIT: woops sorry, well I guess my link is the blog that goes with the pics that Hiz-n-Herz posted. Yay for work blocking pictures, didn't realize there were pictures in his post.

 

bBecause they are the type to talk out their ***.

 

Nope, no tune yet at all. Can 't wait for a tune. I may have ZCG hook me up with the Osiris Uprev tune. 300 WHP would be nice. But would be even nicer to get some area under the curve all over.

 

I completely agree with you.

Correct me if I'm wrong because by no means am I an expert on the subject. After reading multiple, and I mean multiple, threads on HR intakes it seems to me that the stock air boxes are still the best option for our cars. It seems to me that the only reason that the Injens are making more power on the dynos are because they sit lower between the grill and that allows them to suck in cooler air while the car is strapped. At the same time the stock airboxes are affected by heatsoak while on a dyno thus not producing the same numbers that an Injen would make. In reality, of course, the car is always in motion negating the airflow issues that are present on a dyno and allowing the stock air boxes to function as they were engineered. If my logical train of thought is on the right track then when the car is in motion the Injens are probably not better and maybe even worse than the stock air boxes. Correct?

 

You're wrong.


Corrected.

 

I'm no expert eitherbut my guess is that Nissan knows, mathmatically, how many CFM of air the engine as built needs and has figures for the reduction of effectiveness of particle-trapping filters between air filter maintenance intervals.

I am sure the OEM intakes are adequate for the stock engine and likely there may be less gain for an aftermarket engine with only adding an aftermarket air intake system and no other mods.

You also have to understand that car manufacturers have different goals for an air intake system. One of their goals is to keep the noise down - so they'll sacrafice a few hp/tq to keep sound at an "engineered" level and sound quality. We enthusiasts actually like that intake noise so we are happy to ditch the "intake muffler" in favor of one that flows better and for us the increased sound is a plus.

Now we go and put on exhaust, HFCs, test pipes, whatever and maybe the factory air intake becomes a bottleneck in air flow.

That's just IMO...

 

Yes, but heat soak is still a ricer myth.