Air restricter box - To remove or not to remove!

[XxDriverxX]

Hello.

In 1991-1994 S13, should the air restricter box (opposite side of the battery) be removed or left alone?

I removed it on my previous 240sx, it made the engine rev louder and I think it started to burn more gas.

What's the pro's and con's of removing that box?

Thanks

[Halz]

Its not an 'air restrictor' box.. its not like this production car has unbridled power, and engineers needed to build in a restrictive-width port at the mouth of the air filter box to keep it legal for 'street racing' class regulations.

A pro and con is that you'd be wasting your time trying to figure out that it really does nothing to mess with the air-filter box

[240Stilo]

Originally posted by Halz
A pro and con is that you'd be wasting your time trying to figure out that it really does nothing to mess with the air-filter box

Well the box he's talking about actually does something. Engineers probably wouldn't throw it in there for the hell of it. I just posted it up on a thread a few days ago probably. Well here we go again, it's a resonator box and it makes the car quiter. That's why when you take it off it sounds louder. I took mine off my S14 and I also noticed the difference in sound. The gas mileage was the same. You probably liked the new sound and started gassing it more around town;) . Just lay lay off the gas pedal and take it off if you want; no negative effects. If you're still paranoid, keep the resonator box in your garage "just in case." :coolugh:

[SilviaSR20DET]

Also another reason why you would remove it is if your planning on purchasing a cold air intake where the resonater box has to be remove so that the filter sticks in your front bumper to get more air.

[AKADriver]

Originally posted by Halz
A pro and con is that you'd be wasting your time trying to figure out that it really does nothing to mess with the air-filter box

Pretty much.

Messing with this rinkydink stuff is not going to unlock magic lost horsepower. Just noise.

[Muzzy]

Drill sergeant from full metal jacket: i should gouge out your eyes and skull fuk u!!
take that crap off wimp!!!
its a waste of plastic!!
i know it doesnt help your air flow!!

[twitchy]

GOD!!

Look...its absolutely the same thing on or off so just freakin leave it!!

OR

Do like me and one night when your hammed and have nothing to do you can cut it off, and use the pipe that goes into it as a cold air intake.. Tape off the old air intake scoop and draw air from where that box was!

[MadChild]

You can do what my friend did he just made some hose that went threw the whole were the box use to be and made a adaptor fillin for the canadan light should be. His motor right sounds real mean when he guns but it's still a KA24DE with approx 150 HP.

[Muzzy]

wut??
yea u must have been hammered!!!
u dont have to cut anything...its held in place by screws

[Red]

Or if you like me.... The thing is 3 lbs... Thats 3 lbs I can remove.

The less the better.

[Muzzy]

wow...3lbs??
didnt think it was that heavy

[Bill Roberts]

Jury not out yet...BUT>>>

The Air filter box to MAFS is a device that sheilds hot air from the engine compartment away from the intake air. believe me, when I see (as I see mostly) a cone filter under the hood where the box was..I said previously....damn, the exhaust manifold is right there and it is under the hood...the engine with a "CAI" is actually more of a hot air intake at this point..

So I decided to experment with a thermometer at various places in the intake system.

So far, the resonator below (in front of the left front tire) is Poop.

The Air filter box is "killer" in Sheilding hot air from under the hood. The pipe that funnels air from the headlight to the twin bottom ducts to the airbox is quite nice. The air coming from the bottom of the box from the resonator is poop. Seal or add a 4th duct to front dam.

You want a CAI, remove the resonator, block off the bottom entrance to the box, install a K&N filter.

It gets no better.

You want sound? Remove the pipe to the ducts and let the oval hole on the side of the box be your breather,(open for sound or...) connect a hose to it, run it to the bottom air dam. Still good sound, (I run 2 hoses...plus the headlight area).

Use your imangination, No Pics now.

The objective is unrestricted, filtered air, from the coldest point.

Underhood cones are breathing a $hit load of engine heat, especially after a 1 min idle to a floor event on throttle.


It is something most people don't look at thermodynaically.

My Thoughts, right or wrong, cretique them for what you will.

[twitchy]

yeah bills right

you can remove things for the sound effects, which I did. I didnt go in expecting that I would notice any difference in performance, and I didnt. The sound is better thats it. My current setup again consists of the stock airbox breathing through the hole where old resonator used to be. Its picking air up from an area which I assumed to be a better supply of cooler air. Decides the sound (when I remove the plumbing...sounds the same when its on) I did notice a slightly better throttle response, although sometimes I think its my imagination. Point is that the difference isnt really worth the work to take it off.

I think the clever engineers at Nissan probably know that the engine gets enough air with the stock setup otherwise it would be different. Im not a person that believes a piece of pipe and a filter can make a difference that justifies the price for it.

But thats just me

[wingsnthangs]

Don't remove. I trust the intent of Nissan engineers more so than my desire for aggressive sound.

Plus, I don't care much for sound. If I reasonably could, I'd make my car as quiet as possible.