Removing and Replacing BRZ/FR-S Intake, Air Filter and Noise Generator Delete

[Indestruct]

This is an awesome thread, thank you! I finally hit 1k miles today and was redlining my car... boy is it noisy in the cabin w/this stupid noise generator, serves absolutely no purpose to the car. I will be removing mine.

[Godzilla35]

I wonder if intake companies will be making two versions: one to keep the noise generator and one without

[spiller]

I just dont understand why you would want to remove the noise generator? Im sure toyobaru designed it to keep animals and debris out of there.

Seems like some people want to fuck with their cars just for the sake of it.

[Keith@AIRAID]

Originally Posted by GrimmSpeed

10. Remove the hose routing back to the cabin. Follow the smaller hose from the noise generator to the frame rail below the strut tower. Disconnect the hose from the 90 degree coupler and cap or otherwise cover the open end.


 

Alternatively, you could remove the rest of the hose and use a 1" hole plug at the firewall.

[FTEIGHTSIX]

Originally Posted by Tritty250

All hondas have them there, thats where I come from anyways. I would expect the air to be way more turbulent after fighting to get through the filter. But hey, im not an aero engineer so what I say doesnt matter.

Because this car uses a MAF sensor, not a MAP sensor.
Most Hondas use map sensors in their manifold.
MAP sensor VS. MAF sensor

While both sensors accomplish the same thing we could give the +’s of each.

MAP sensor

1. Even if an intake pipe blows off or there is a vacuum hose leak the car will run the same, as the actual manifold pressure will not be any different so you will not be left stranded some where.

2. Sensor reads actual load so there is no guessing what load level the engine is seeing.

MAF sensor

1. The amount of CFM entering the motor is VERY accurate even at low air flow levels. Because of this MAF sensors have a tendency to get better MPG’s (miles per gallon).

2. Most have a built in AIT( Air Intake Temperature ) sensor so you can monitor your actual air intake temps at the sensor.

[Kimsey47]

I'm surprised this was included just due to the weight savings of not having it on the car... Oh well, don't mind it either way...

[waylonrobert]

What's the benefit in removing the noise generator? What exactly is it designed to do?

[Tritty250]

Originally Posted by spiller

I just dont understand why you would want to remove the noise generator? Im sure toyobaru designed it to keep animals and debris out of there.

Seems like some people want to fuck with their cars just for the sake of it.

It's a luxury feature for daily driving to keep the cabin (in car) noise down below a certain RPM (i think 4000?). Above 4k I believe it does nothing. So by removing it you can hear more engine noise across all RPM's. It doesnt effect anything but sound levels if you remove it. And what enthusiast doesnt want to hear their engine?

[Kwaziekeller]

My .02 as I've deleted it myself. Pretty simple/straightforward, I removed the hose @ the firewall and capped it there. To cap the intake side I took a different approach, the "cheap" route (I plan to order an intake soon (aFe/Takeda's to be exact). Spray painted a aerosol can cap and taped it to the intake. Sure it's cheap, but so is the DA engineer who thought this made a damn difference... should've raised the NVH a smidge and put a straight through axle-back (reminiscent of the 1st gen SRT4) on instead of some "sound generator tube" lol.... Since the other pics are covered already, I'll show a before and after...





PS I couldn't find my flat black spray paint, so the cap is coated in "Brilliant black crystal pearl"... the color of my old SRT8 lol.

[Skywgn1]

Did you find any hp differences on the dyno?

[Black Tire]

I will definitely be removing the noise generator. I think it is quite loud in the cabin at high revs for no good purpose. I am also interested in removing the tube that connects through the firewall, as it will be useless once the noise generator is removed.

At least we don't have to deal with an electronic noise generator (through the stereo system!) like the one on the new BMW M5.

[Black Tire]

Originally Posted by Tritty250

It's a luxury feature for daily driving to keep the cabin (in car) noise down below a certain RPM (i think 4000?). Above 4k I believe it does nothing. So by removing it you can hear more engine noise across all RPM's. It doesnt effect anything but sound levels if you remove it. And what enthusiast doesnt want to hear their engine?

I think this is incorrect. I think the noise generator was put in so that you CAN hear the engine noise. I think the designers (or more likely the marketing people) thought that the noise in the cabin without it did not make the car sound "powerful" or "cool." Deleting the generator should result in less noise at all RPM's, but especially at higher RPM's. Read what GrimmSpeed said:

Originally Posted by GrimmSpeed

Interesting. We did it and measured the dB before and after and found that there was a consistent 3-4dB decrease with the noise generator removed and windows up. That's definitely not an insignificant amount. As far as MAF placement, I suspect that there might be too much turbulence up near the TB for an accurate reading.

- Matt

[FT-86GOD]

Originally Posted by waylonrobert

What's the benefit in removing the noise generator? What exactly is it designed to do?

Lol are u serious? The noise generator is designed to..... Generate noise....


I'll be deleting it... It will serve no purpose once I turbo or in the mean time fit a decent intake showing improved output once one is developed.. Wonder if someone will design an OTR intake for the 86/BRZ

[ill86]

Originally Posted by Black Tire

I think this is incorrect. I think the noise generator was put in so that you CAN hear the engine noise. I think the designers (or more likely the marketing people) thought that the noise in the cabin without it did not make the car sound "powerful" or "cool.":

You are correct. It is designed so that the driver hears more intake sounds above 4000/4500 rpm. This is the sole purpose.

I know this as I teach motor sports and have done events with Toyota with the FR-S "roll out".. . ie, familiarization for new owners, salesmen, etc.