They do come with directions, but some of the members asked me to do a little extra because some of the InJen instructions were a little fuzzy.

 

The stock 350Z intake is a "Cold Air" intake.
This is a good read from another forum :

http://www.eastplaza.com/mem/dakota/perform/air_in.htm

 

Is it possible to hook up an aem air bypass valve to the injen CAI? I am a little worried about water. Thanks.

 

OMG. What a bunch of nonsense on that site about air induction. Obviously this Nick hasn't the slightest clue on how to tune an engine. That site is more about bashing manufactures product than trying to give accurate information, which it doesn't.

There is a reason why auto manufacturers come to the aftermarket industry (Nissan, Honda, Toyota, etc). Manufacturers make the best car possible with many constraints, like budget. Air intake systems have to be the best as possible with constraints, like emissions, additional noise, etc. Leave the "guesswork" and "fancy pipes" to us.

 

ok cool. thanks for the added info...should come in handy

 

I know some people have opted to make a "shorty" version of then InJen by leaving off some of the pieces. But the air filter is coated to repel water and I, personally, haven't had a single problem with it. The only thing I think you'd have to worry about is if your filter was submerged in water.

 

Nice install, looks like a PITA getting that filter on with the bumper still on

 

You should know. You were the one underneath the car trying to do it. Everyone, say hi to my hubby.

 

how low does it actually go? How far is it from the ground? Any pics of that? great write-up by the way!

 

The air filter sits right behind your front grille. So you've got roughly 12 inches of clearance from the ground. I have pics, but only on my home computer. I'll post one up when I get home from work.

BTW, West Covina? I used to know a guy there. lol

 

Nice write up! Very informative!

 

350zSpeedRacer,

I installed mine yesterday but I couldn't fine a place to secure the air filter. Does it have to be bolted down or can it just sit there behind the front grill?

thanks,

Vance

 

I'm going to get my hair cut in a few minutes, but when I get back, I'll try to find where hubby and I secured the air filter so it doesn't move.

 

It looks like the Injen will give you approx. 8HP gain in the 4000/5000 RPM Range. I've seen a Dyno Chart of it not too long ago, test were done by a magazine that specializes in Cold Air intakes, also worth mentioning with a Good High Performance Exhaust system you will be looking at the magic 300HP mark , obsviously not at the wheels but 300HP power at the engine.

 

I couldnt get the tab to line up to hold the airfilter in place, but it is not going anywhere Its pretty secure

 

so does it work?

how much gains in HP?

 

how's the intake change the sound of the engine? i know when i put a cold air on my maxima it had cool little whistle at idle but man does it roar when you get on it. is this similar? more subdued?

btw - nice writeup and pics!

 

Spent 2 hours on the weekend installing the CAI.

Job task not difficult, the heat sheild placement and just trying to figure out where it goes was the hardest thing to do!

Some one asked about the air filter mounting, the instructions need some work, here is what I did.

You need a good jack to raise the car. I removed the screws from the bottom plastic shield (there is no reason at all to remove the bumper) this completly exposes the area behind the bumper where the filter mounts.

There is a black plastic shield on the end of the aluminum bar that doesn't seem to do anything. It is held in by 3 removeable clips. You can remove the clips by putting a slotted screwdriver to pop them through the front grill, they are really easy to remove.

This exposes 3 holes (there are 3 clips), the instructions tell you to reuse one of the holes and the clip. The problem is that the clip is TOO DAMN SHORT to hold the bracket in place. I got a self tapping screw and used to hold the muffler housing in place.

I also removed the plastic air intake housing (the piece that feeds air to the original air filter) that was there so that I could pass the red Injen house to the bumper side. Probably didn't need to be removed but it made it a little easier to pass the hose.

Oh one other thing, the heat shield... I chosse to grind a piece off at the front (I know hard to picture)... if I didn't I was afraid that over time it would touch what appeared to be an AC line, just grinded off a small piece to go around the AC line.

As for the performance/sound...

1. The car idles very rough now, it wasn't the smoothest before but it is very noticeable now. Almost to the point where it sounds like it is back firing and about to stall.

2. There is NO difference in sound under 4500-5000 rpm. You can say what you want, I have it in and am not going to remove it so I have no reason to BS or make it sound like this is the greatest thing I've ever done. Very little difference in sound from both in and out of the car.

3. Past 5000 rpm, there is more of a growl but to be honest it is not significant.

4. As for the the power, it may be my imagination or my wanting to believe that there is something different ... questionable at best!

5. It looks like a million bucks when you pop the hood .. no question.

Would I do it again, it would probably take me an hour to do it again but I honestly don't think I would knowing what I know now. Maybe (as it has been suggested before) this is just one add on but keep going with cat-backs, headers, what not maybe it will all add up!

Honest guys ... it does look good but not much more for almost $400 Cdn dollars. It was fun doing the work though!

 

That worries me. My car hasn't idled roughly once before or after I installed my CAI. You did disconnect the battery to let the ECU reset, right? Wonder what that could be, because a CAI shouldn't mess up your idle unless the ECU hasn't adjusted to it.

 

And my apologies for the delayed response, fatZo. A CAI works basically by bringing in more, cooler air to the throttle body. More air means increased fuel to mix with and cooler air is always better because it also helps out in the power department. (At least theoretically.) The InJen *should* be better than stock because of the air filter placement. It's in front of the radiator and not further up and back where air is not as free flowing.

I couldn't tell you for sure about HP gains because I have yet to find the time to go get my car dynoed. But I will let everyone know when I do.