What is this black box .....??

[humfrz]

Hi Folks,

While looking over the engine compartment of my new FR-S, I spied this black box (the one with the matt finish, right - center, in the picture below).

Can you tell me what's it called and what it does ..??

TIA

humfrz

[dsrttigr]

Cricket feeder?

[campy]

[TRD-X]

It's where they mounted the flux capacitor on the FR-S.....

[Yellow13]

Its just a resonator in the stock intake, as Campy showed above in his pic.

[BANGER]

It's where VTEC fluid goes.
Oh wait, wrong forum.

[Luis_GT]

They put a sound tube so you can hear the intake... but they put a resonator to lower the noise...

[mav1178]

Originally Posted by Luis_GT

They put a sound tube so you can hear the intake... but they put a resonator to lower the noise...

The point of a resonator is not to lower noise, it's to achieve a desired intake noise.

This may be a lower overall noise output (db), or it could be a specific intake note under acceleration (what you hear in the sound tube).

Ideally the manufacturer wants an aggressive intake note on sports cars (especially small displacement/low cylinder count) without droning.

-alex

Edit: http://en.wikipedia.org/wiki/Resonator#Automobiles (also forgot resonators often are used to improve air/exhaust flow if tuned properly. this improves VE of the engine while still meeting emissions requirements)

[Luis_GT]

Originally Posted by mav1178

The point of a resonator is not to lower noise, it's to achieve a desired intake noise.

This may be a lower overall noise output (db), or it could be a specific intake note under acceleration (what you hear in the sound tube).

Ideally the manufacturer wants an aggressive intake note on sports cars (especially small displacement/low cylinder count) without droning.

-alex

Edit: http://en.wikipedia.org/wiki/Resonator#Automobiles (also forgot resonators often are used to improve air/exhaust flow if tuned properly. this improves VE of the engine while still meeting emissions requirements)

I know what it does, I was doing a joke...

[TRD-X]

Originally Posted by mav1178

The point of a resonator is not to lower noise, it's to achieve a desired intake noise.

This may be a lower overall noise output (db), or it could be a specific intake note under acceleration (what you hear in the sound tube).

Ideally the manufacturer wants an aggressive intake note on sports cars (especially small displacement/low cylinder count) without droning.

-alex

Edit: http://en.wikipedia.org/wiki/Resonator#Automobiles (also forgot resonators often are used to improve air/exhaust flow if tuned properly. this improves VE of the engine while still meeting emissions requirements)

If so why does the TRD intake delete this ricer part.



Disclaimer ricer part is in my opinion....

[mav1178]

Originally Posted by Luis_GT

I know what it does, I was doing a joke...

I'm explaining to the OP what the resonator on our cars do. Your post (joke or not) just so happens to point out the most common misconception about intake resonators, hence my quote.

-alex

[djleepanda]

Boys...dat der is r a Hemi.

[Luis_GT]

Originally Posted by mav1178

I'm explaining to the OP what the resonator on our cars do. Your post (joke or not) just so happens to point out the most common misconception about intake resonators, hence my quote.

-alex

Sometimes it simply is used as a muffler...

My E39 came with an Intake Res, whereas the E46, which has the same exact engine, didn't.

[mav1178]

Originally Posted by TRD-X

If so why does the TRD intake delete this ricer part.

[/B]

Why do most aftermarket intakes do without resonators? To achieve max performance gains, with droning and emissions as secondary concerns.

http://www.ehow.com/info_12156112_ai...onator-do.html
The link talks about performance, but this also ties into the primary reason: stock ECU tune for maximum balance of performance/reliability/emissions.

OE intakes are designed that way for a variety of reasons, many are related to actual driving comfort of occupants in the vehicle from what we can hear/tell. A lot of aftermarket exhausts have annoying sounds at specific frequencies because of lack of sound tuning for this reason.

Just because it's TRD doesn't mean it's Toyota's aftermarket gift to this car.

-alex