air boxes

[Celica RA45]

if you guys are sick of induction noise with either quad throttles or webbers by making a airbox you can quiet it down, also you can drop the intake air charge by as much as 15 % by having out side air going in .
example my car had ramtubes with socks on it taking air inside the engine bay average temp on a 20 degree day was 29 degress and higher as the revs went up
making the air box and bringing the noise and air temps down and hp up is worth doing ,you could pick up aleast 5 hp at the back wheels .even the std 2tg with it air box cuts the noise down but make little difference with air temp ,most new cars are taking air from outside the car BA falcon, honda S2000, holden dunny door

[roadsailing]

what?

how can you get sick of induction noise?

you haven't come up with any new info here.

how about a bit of detail on how you did it, saying "cold air induction" is all very well, but on a multi throttle engine it is a bit more complex.

are you using one filter or 4? how have you routed your piping?

pics!

[Celica RA45]

the air box i made is out of fiberglass and is about 15 liters in size with a 100mm piping going into it and i have a sock filter that is like a cone or witches hat that fits inside the piping will take pics when i get a chance

[mic*]

I think that Shiny has a fair point in saying give us a few more details on your insight... The pics will be good.

Fibreglass is ok, but i havent used it.

Other options, things that i have mucked around with are thin sheet metal (with some insulation), HDPE (plastic) board, or even MDF but thats pretty budget.

My suggestions are;
Build a full template with carboard rather than just trying to measure & cut.
Make sure it seals well - but the filter within is easily servicable...
Make the inlet (air feed) hole to the box as large or larger in area than the X-section of the pipe that exits your box.
Try to place the inlet hole as far from the exit hole as possible as this will generally be better for flow.
If there is no clear option for ducting cold air to the box, put the inlet hole right next to the quarter panel and suck air from around there and the headlight.

***I've seen a couple of used EFI cars with pod filters on them where the car had an airbox from the factory, and there is a little electrical connector dangling around where the airbox was. If this is you, chances are this is the air temp sensor. Find a wreck, and cut the sensor out of the airbox and shove it in your box . Its always a bonus when the ECU has an input signal to all the sensors...

[Dom-AE71]

i jsut pulled this off the 20v and noticed the inside had this baffel on it before it goes to the runners.

the car was turbo before. how would this effect performance, induction noise, and emmisions? i could only imagine it would bottle neck it at not breathe as well with the baffel but would it casue uneven airflow if it wasnt there?

i might stick with this airbox while im getting the car engineered and regiested becasue itll be a hell of alot quiter than open trumpets and socks!

[roadsailing]

dom, what the hell is up with that manifold?

does all of the air have to go through those tiny drilled holes to get into the inlet ports?

if so, then dont put that on your engine, and the reason it is quiet is because the engine isn't making any power!

[Dom-AE71]

well engine makes no power atm becasue it hasnt got the crank angle wired up sensor so i cant turn it over.

but yes it has to pass through those holes

when i saw it i thought something was a bit farking off with it too!

so get it removed?

[oldcorollas]

yup, looks fecked..

you could do it easy by splitting the manifold (with an angle grinder.. use thin blade, ie 1mm) then grind out the restrictor, then get it welded back up.

you could stick some small bellmouths in there at the same time

[Dom-AE71]

yea for some reason megz reckons it distributes the air evenly?? his brother was the one who did it i found out jsut b4.

so the air flow would still be even if i had it with bellmouths on the inlets instead of the baffel?

for the purpose of passing engineers emiisions tests and stuff should i jsut leave it as is? once the cars engineered i was going to use my trumpets and socks anwyays

[oldcorollas]

well.. look at the size of the ports. look at the size of the original quads. then look at the area (or better yet, calculate) that those holes allow air to go thru....

sure it will be more even, but a heck of a lot less will get thru.... or so it seems.

meh, chuck it on the dyno and see how it goes maybe it is a new way of improving the 20V? ya never know....

[TwentyTwo]

Mate, if you were to pipe that manifold to your mouth and go for a run, you would asphyxiate. I don't rate your engines chances too highly...

[20v86]

i had that manifold on my car when it was n/a. i gave it to dave and he put in the metal plate with the drilled holes for when he turbo'd his 20v. it seemed to work quite well in both setups. eg n/a without the baffles, and turbo with them.

[Dom-AE71]

ok sweet yea i was thinking with the turbo setup there would be as much as an issue as it would help to distribute the compressed air but i dont think it would be very benificial for n/a

ill leave it on and see how it goes with it on might jsut keep the noise level down maybe emisions too for engineering

thanks guys!

[gixer]

I agree with Shiny.....how could you get sick of the sound!!!

[Dom-AE71]

i think everyone is missing his main point and that is reducing the air charge by up to 15% by taking in cold air from outside the engine bay. for some loss of sound would be a negative but in extreme conditions, ie track racing, the constant noise would probably be more fatiging also