Mysterious Black Box of Nothingness....

[solitaire]

Hey

On My NA AE92 Levin the is a small plastic black box which is completely empty hanging of the factory tubing between the airfilter assembly and throttle body... im almost sure it does nothing but create turbulence... but its driving me crazy not knowing what it does... can anyone help?

[Quint]

Could be a resonator, cuts down intake noise.

[solitaire]

Hmm... its hanging off rather than inline... (i know nothing about sonic physics) would that quieten it down?

[AJz]

its a resonator box, basically put there to quieten down intake noise. Other than that, nothing much else

[HELBND]

i wish i had a dollar everytime i saw this question


FAQ anyone?

[solitaire]

i wish i had a dollar everytime i saw this question


FAQ anyone?

Does it mess with airflow above 5k? or is it negligable?

[slighty_sykotic]

You wont get the rushing-wind kinda noise if it's there, if you remove it it will be a little louder.

--Sykotic

[Ako]

The answer is Helmholtz!

Its partly to cut down noise, its also partly for air dynamic type stuff which most of us won't have a hope of understanding.

From all the cars I've had, and pulled it off out of curiosity - they got marginally louder, went no faster overall, and normally gained themselves some weird flat spots throughout the rev range.

All pain, no gain.

[solitaire]

The answer is Helmholtz!

Its partly to cut down noise, its also partly for air dynamic type stuff which most of us won't have a hope of understanding.

From all the cars I've had, and pulled it off out of curiosity - they got marginally louder, went no faster overall, and normally gained themselves some weird flat spots throughout the rev range.

All pain, no gain.

Gotta FAQ that one...

[toyrota mota]

I remember seeing a tech artical in a HOT 4s or something mag where they tested out changing the size of the resonator and it actually had a small effect on the power curve.

[Ako]

I saw the same article - was an 1800cc lancer or something.

The ONLY time they made any improvement at all over the factory setup was when they used a 10L container or something

[solitaire]

I saw the same article - was an 1800cc lancer or something.

The ONLY time they made any improvement at all over the factory setup was when they used a 10L container or something

Cool so summary is leave it on... unless i buy a gtv bonnet and stick the 10 litre container where the scoop should be?

[toyrota mota]

Yer i cant really remember the article that well, but i remeber they used a 2.25 coke bottle aswell haha, just get the 10L container chromed itll look bling as

[RedMist]

The answer is Helmholtz!

Its partly to cut down noise, its also partly for air dynamic type stuff which most of us won't have a hope of understanding.

From all the cars I've had, and pulled it off out of curiosity - they got marginally louder, went no faster overall, and normally gained themselves some weird flat spots throughout the rev range.

All pain, no gain.

Yep the slight increase in noise is air hitting air. Helmholtz predicted the spring action of a gas. The Helmholtz resonators are there to setup a scondary spring action and disturb the primary spring. In effect stop both the noise you hear at certain RPM and also to ensure a smooth flow of air into the throttle body..... which does beg the question why on earth do we try so hard to setup a Helmholtz action inside a runner!?
Wonder if a resonator per runner would give a broader torque curve.... mmmmm. Dyno anyone?

[gepsk8]

personaly unless ur got big cams, tunning, etc. i would leave standard air pipe for filter to intake alone as toyota have spent heaps of money tuning the car to get the best power, etc, most likely to lose power.
but saying that before airbox go nuts, i've removed my resonator in my guard and small intake pipe have been and cut a hole in the airbox to let more air in got way more low down power.

[solitaire]

personaly unless ur got big cams, tunning, etc. i would leave standard air pipe for filter to intake alone as toyota have spent heaps of money tuning the car to get the best power, etc, most likely to lose power.
but saying that before airbox go nuts, i've removed my resonator in my guard and small intake pipe have been and cut a hole in the airbox to let more air in got way more low down power.

You got rid of that little pipe that leads from behind the headlight and cut a bigger hole in the airbox yeah?

[gepsk8]

yip, took the part out of the gaurd to, u will see it once the small pipe is removed. cut hole about three tims bigger on the bottom part so the filter still works, moved battery over to to let better aif flow in was gone box it in of but nw battery does a good job of that as its huge. might put a up pipe in later to get better airflow in.