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Resanator Box On The Oem Air Intake

ToolmanUK

By ToolmanUK,
in Engines & Forced Induction

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ToolmanUK Explorer

ToolmanUK

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Does anyone know much about the resanator boxes on the standard air intake?

A guy over here custom made an alloy air intake losing this box.

He noticed that this caused his car to run funny and lost power.

He cut the standard resanator box open and says it has lots of circular chambers in.

Anyone know how they work and if there are any form of aftermarket one's you can fit?

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https://www.sau.com.au/forums/topic/244066-resanator-box-on-the-oem-air-intake/
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ToolmanUK Explorer

ToolmanUK

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whats wrong with u

What do you mean?

If it was cause this posted like a million times, i don't know what happened with that.

It took ages to load up then came up with all of them posts :D

ToolmanUK Explorer

ToolmanUK

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i have removed the multiple posts

Cheers Eug!

Why's MPR33 awsome for saying what's wrong with me?

Not like i done anything wrong :D

Anyways, back to the thread please peeps, anyone know anything that can help?

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted

What you're talking about is refered to as an intake plenum and it's there to provide off-idle and low range throttle response for an N/A. It's like a chamber that holds an extra air supply close to the throttle butterfly for accelleration so the engine has air available when the throttle snaps open and the fuel is delivered. Take it away and your engine will probably feel sluggish in the low to mid range and want to stall in traffic, but should be OK at the track. You can re-tune your ECU but that will only go so far.

The circular chambers are there to help with air turbulence and to help with intake sound dampening ( resonation ).

Hesh Collaborator

Hesh

Posted
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hi guys hesh from the good ole uk here. just want to be sure we're singing the same song. in the uk the term "plenum" refers to the metal intake on the left of the block (as viewed from the front) but what toolman, (and myself) have been looking into is the plastic square thing on the intake pipe)

if we are indeed talkingabout the same part then i guess if the chamber is designed to create as you say an air supply off throttle then an aftermarket one isnt gonna gain much as developments gonna need lots of air flow calcs...

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted

The way I see it, off the left side of the engine ( from the front ), the collective cast metal pipes that bolt to the head are known as the lower half of the inlet manifold and then the upper half of the inlet manifold. Although I have heard of people refering to the upper half as a plenum.

The part I'm refering to as a plenum is also known as a collector. The "inlet pipe" is the part that connects the AFM to the plenum / collector and the throttle body.

Anyway, call it what you will, the black plastic bucket on the right side of the engine is what I was talking about :P

ToolmanUK Explorer

ToolmanUK

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Thanks TokyoTaxi, that's just what i was after knowing.

Do the circular chambers only help with air turbulence and intake sound dampening?

Is the box just to hold more air?

If you had a bigger box or if an extra feed of air to the box would that help performance in any way do you think?

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted
Thanks TokyoTaxi, that's just what i was after knowing.

1. Do the circular chambers only help with air turbulence and intake sound dampening?

2. Is the box just to hold more air?

3. If you had a bigger box or if an extra feed of air to the box would that help performance in any way do you think?

1. Yes ( AFAIK )

2. Yes. It's there to hold low restriction air ( air that has to come through the filter has a higher restriction ).

3. A bigger box probably won't help any. An extra feed "might" help but it would have to be cold air... You have to remember, NISSAN have done a large amount of R & D with enviroments and instruments that simulate everything to produce the best all-round result so messing with the factory design is likely to leave you with improvements in one area but a reduction in another. With that said though, there's always room for improvement and it's fun to see if you can better what the factoy has done if you have the time and $'s to play :)

At a guess, I would say the best low cost performance upgrade for the N/A induction would be to keep the factory set-up from the engine to the AFM and then just install an APEXi pod filter and partition the pod off so you have only fresh / cool air supplied to it. I haven't done this so I'm just guessing :( All I've done is put an APEXi panel filter in. I honestly don't believe that the RB25DE NEO could max out the factory induction system. Sorry for the long arse response. ;)

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted
has ainy one removed this part and or replaced it with an alloy tube or similar?....and if so with what type of results?

Most people that have done this have found the car is worse down low, OK in the mid range & better in the top end.

Do a search & have a read.

Hesh Collaborator

Hesh

Posted
Posted

had a read before posting, and one of our guys over here is doing just this with similar results. the whole reason toolman (and beleatedly myself) were asking about the resonator box was an attempt to figure out what this part does and therefore why the the reduced performance when its removed....

from your reply it would seem that this box has a similar perpose to that of the NVCS onthe NA varient, specifically to imporve low end drivability, whilst retaining high rev power/torque.

would i correct in assuming then that when at high revs this box is pretty much superfluous? as the air intake charge is going much faster and therefore wont have time to "bounce around" the internal chambers?

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted
1. had a read before posting, and one of our guys over here is doing just this with similar results. the whole reason toolman (and beleatedly myself) were asking about the resonator box was an attempt to figure out what this part does and therefore why the the reduced performance when its removed....

2. from your reply it would seem that this box has a similar perpose to that of the NVCS onthe NA varient, specifically to imporve low end drivability, whilst retaining high rev power/torque.

3. would i correct in assuming then that when at high revs this box is pretty much superfluous? as the air intake charge is going much faster and therefore wont have time to "bounce around" the internal chambers?

1. That's cool. Wasn't having a go at you but was just busy. Sorry if I sounded harsh :D

2. Simply put, Yes. But, in different ways. The Plenum / resinator box / collector / accumulator is more for engine "stability". NVCS is directed more towards performance.

3. Spot on ! :P

TokyoTaxi Veteran

TokyoTaxi

Posted
Posted
ok read this post with intrest as i have a R32 GTS25 with a early (1989) RB25DE.

butmy question is why does the 25 have this plenum on the intake and a RB30E does not.

Just an opinion but I'd say because the RB30 is a more stable platform being a low tech, lower reving engine.

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