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Custom made Airbox/plenum; any suggestions?
Topic Started: Aug 16 2008, 11:43 AM (362 Views)
Levin BZR
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I bought I.mec trumpets for my car.So I am thinking to made a new Airbox for my car.What do you think guys?Is this a good idea?I don't want to run with open air funnels (too much dust,very warm weather).Give me some ideas!! :wave:
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chiksluvit
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[OO\_____/OO]
why not use the stock airbox?
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BZ-G
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aka Hyper Rev 4...
it won't be cheap.... unless you DIY it...
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Levin BZR
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@ BZG: I will DIY it!

@chicksluvit: I want something smaller than this on our car.This is too big due to the 90 degrees standard air funnels.

I will do something similar to this one,but I will drop a panel filter on the top of this!!What do you think?
http://i3.photobucket.com/albums/y85/badboyscyari/e90d0f4e.jpg
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TRUENOSAM
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Stage 6
Fitted my ARC system about an hour a go. Very impressive quaility and sounds good too.
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BZ-G
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aka Hyper Rev 4...
seems a good idea levinbzr... i would suggest to curve the bottom part for better flow of air...
fitting a filter on top is good, but wouldn't it suck a lot of hot air in the engine bay??? i would suggest to close the box and run a pipe from the front of the car like what would normally happen to our stock air box...
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devo
Stage 6
its a very good idea bzr,iv never heard of a custom air box,are u going to go ahead wit it,also as bzg says wont haven a panel filter at the top not suck,in all tat hot air from the engine bay,id love to see this done,and the results of it. :D

bzr i think this is a very good example,the itbs are wel clear of any heat,plus looks like he has a nice clean air feed from the front as bzg stated be good.jus click the jamaican engine in the top left for a bigger pic,u thinkin somethin like tat.

Posted Image
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sabajin
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sabajin
levin bzr, i also bought the imec trumpets and i already install them. Am running them open, but compared to a custom made trumpets that i had (85mm), the imec are waaaaaaaaaaaaaay better, since being shorter i guess there is more space for air and also because of their mouth design.

On top of that, i have seen comment about the imec trumpets saying that they shift the power band, Does this means that shifts it higher or lower, because the vvt is kicking around 4k-4500 rpm. Before it was kicking around 5500.

TRUENOSAM, what arc system have you installed, the super intake chamber?
http://www.rhdjapan.com/jdm-low/ARC-Super-Intake-Chamber-AE111-50298

About the airbox, the imec trumpets have been designed to be used inside a plenum, like the instruccion drawings shows. As devo said, it would be great to see that custom airbox done, who will be the guinea pig? :whistle:

:wave:
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Levin BZR
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thanks guys! :cheers:

BZG: I will try to curve the bottom part.Are you running with open air funnels?? If I drop a panel filter,will it suck as much hot air as I will leave them open??

sabajin: I think imec are very good for their job.TODA is overpricing its products.. :whistle:
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chiksluvit
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[OO\_____/OO]
hrmm didn't really think the larger stock airbox is a problem at all though...

if you face it to the bottom wouldn't you pick up the surrounding hot air from the exhaust and the engine too?
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jetshin
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Stage 5
aren't the imec trumpets really short? so there should be no problem running them in the stockairbox. (btw from what i've read, the shorter the length of the trumpet the higher up it shifts the powerband).

I think if you want to run open trumpets expect to lose power with the standard ECU, you could figure out some kind of cold-air feed but you'd still need to use sock filters over the trumpets which apparently ruin the airflow anyway.
However if you're doing it just for that sweet intake sound, more power to you.

btw VVT 'kicks in' depending on the throttle position not RPM ^o)

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Levin BZR
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@ jetshin: I don't have a standard ecu..I have an upgraded one by Mine's.

Chicksluvit,you think the standard airbox is ok?
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Levin BZR
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chiksluvit
Aug 18 2008, 03:39 PM
standard box is totally fine... the i.mec's demo car actually runs the trumpets in the standard box...
bigger box is definitely not a problem, in fact when tom's redesigned the ae101 box, they only re-did the cover, which was to aim at increasing the capacity of the box.. and the tom's ae101 airbox came with short trumpets to replace the longer factory trumpets angling downwards.

just trim the cylinder 1 trumpet a bit so that it'll fit in the standard box properly

once you've fitted the standard box back, before you connect the intake pipe, shine a torche into the standard box from the intake side, you'll see what i mean by the i.mec trumpets are really designed for the stock box...
Thanks mate!! I will post some photos when I will receive my trumpets!!
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TRUENOSAM
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Stage 6
sabajin
Aug 18 2008, 03:48 AM


TRUENOSAM, what arc system have you installed, the super intake chamber?
http://www.rhdjapan.com/jdm-low/ARC-Super-Intake-Chamber-AE111-50298



I have the chamber and air box. The chamber being the part in the link. I have the box too. B)
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Levin BZR
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@sabajin: Yeah,i have bought them from ebay!!
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steveonagle
sdtrhftrra
where did you buy the imec ones as matter of interest nice car by the way

sorry know you said ebay but i cant find
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BZ-G
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aka Hyper Rev 4...
Levin BZR
Aug 18 2008, 09:25 AM
BZG: I will try to curve the bottom part.Are you running with open air funnels?? If I drop a panel filter,will it suck as much hot air as I will leave them open??
yeah... i am using open air funnel but i'm not driving my car at the moment so i will be making a close box up later on...
no matter if you're using a filter on top or not on the box, it will still suck a lot of the heat under the bonnet...
it's better to close the box and have a hole on the side like the factory box and run a cold air pipe into the box would be more ideal...
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chiksluvit
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[OO\_____/OO]
sabajin
Aug 18 2008, 05:39 PM
levin BZR, did you buy the trumpets from ebay?

chiksluvit, what do you mena by "shine a torche", sorry, my english is a bit rusty, could you explain this to me in easier terms? :$ :$

by shining a torch into the airbox i mean..
after the imec trumpets are installed, and airbox reassembled....
get a torch, turn it on so it lights up
aim the torch light to the inside the stock airbox from the round opening on the side, so there'll be light inside the airbox and you'll be able to see into it

reason why i suggested it:
you'll then be able to see the i.mec trumpets there sitting nicely, right before the intake of the box, and the length is just right, not too long to obstruct the air flow...
Edited by chiksluvit, Aug 19 2008, 07:42 AM.
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sabajin
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sabajin
chiksluit, iluvu ;) hahaha, thanks a lot for the explanation!!!, I understand now.

steveonagle, i will contact the ebay guy who sold me the trumpets, because as far as ma concerned, he still has 3 spare sets, and tell him to make a new listing for you.

:wave:
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frax
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Stage 6
there is one way i'm thinking of doing it. make a custom box around the intake and stacks. mount a panel filter on top. place a bonnet scoop directly above the box. get some long weather strip and seal the eadges together to make a lid. when you close the bonnet the weather strips fall over the intake box. when you start the engine and it starts sucking air it pulls the strips towards the intake, sealing it off from the engine bay.
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Ae111blast
Stage 5
N/A cars don't like scoops, it creates negative pressure or something like that!
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DreadAngel
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Han Lue
Can always try frax =)

A mate of mine exploring various scoops etc then seeing how it'll run into his car =) Personally imo, unless you run something like a SuperGT feed with a enclosure from the scoop directly to the trumpets, you'll lose power and torque...

Running open throttles loses power and torque throughout the rev range, proof? I tested it in my car, sounds like a F3 but dear god was it horrible in power/torque delivery...
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frax
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Stage 6
DreadAngel
Sep 5 2008, 12:09 AM
Can always try frax =)

A mate of mine exploring various scoops etc then seeing how it'll run into his car =) Personally imo, unless you run something like a SuperGT feed with a enclosure from the scoop directly to the trumpets, you'll lose power and torque...
Ah yeah. SuperGT feed. i never even thought of that :$ . Im still coming to terms with whether or not i'd be able cope with cutting the hole in the bonnet to run the scoop :wall:
Edited by frax, Sep 5 2008, 08:37 AM.
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chiksluvit
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[OO\_____/OO]
the stock ecu overfuels and retards timing if you run it open, since the stock ecu isn't mapped for open throttles..
not helpful for power delivery
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jetshin
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Stage 5
someone really needs to post some dyno sheets of the same car and dyno with factory airbox, open stacks and maybe a pod so we can really see what the difference is. TBH you can never really trust anacdotal evidence of someone saying "it's more responsive" or "it's got better topend/lowend bro!" when the difference maybe only a few HP or less than a 1% gain/loss.
I think people are also affected by the more aggressive sound of pod filters/open trumpets too, making them think it's faster when really it just sounds faster :D
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DreadAngel
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Han Lue
kyleseo
Sep 8 2008, 06:08 AM
DreadAngel
Sep 5 2008, 12:09 AM


Running open throttles loses power and torque throughout the rev range, proof? I tested it in my car, sounds like a F3 but dear god was it horrible in power/torque delivery...

Yet there is also evidence to prove it does increase power and there is no loss of torque.
Could just come down to the engine or the rest of the mods.
I've tested this with my B16A, running ITBs with and without cover with both stock internals, modified internals, dyno tuned and not dyno tuned with and without aftermarket ECU. Results always favoured with cover...

Think about it logically man, if it produced more power/torque without an airbox, why do the professional teams add one then? Because if its not fuctional, then they won't add it because it adds weight.
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frax
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Stage 6
DreadAngel
Sep 11 2008, 06:10 AM
frax
Sep 8 2008, 08:43 AM
BZ-G
Sep 8 2008, 04:43 AM
also have to think about water when it rains.... you know getting water into the scoop....
rain? :blink:
Dw, HyperRev 4 is talking at speeds far too high for us to consider :p so don't worry hahaha :p :whistle:
where i am rain is a luxury.
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DreadAngel
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Han Lue
That is SOOOO true, but you after to watch out for dust, dirt, the odd roo, etc
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BZ-G
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aka Hyper Rev 4...
what about bugs getting into the scoop?!?!? :whistle:
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chiksluvit
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[OO\_____/OO]
OH BUGS

ya i sometimes get bugs in the airbox and on the air filter
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JDM
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AE111
has anyone ever put 4 intakes going straight from up through the bonnet to the throttle bodies?

muscle style?
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The Parrot


would look cool but would not work. you would cause a pressure problem and the air flow would not work right.
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1i1
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NZ Toyota Parts Guy

frax
Jul 22 2009, 09:06 PM
what if we were to make an induction box that goes over a set of trumpets, with an open top, sit a good panel filter in it and have it seal against the bonnet with a wrx scoop above it?
Could work... I think the biggest thing people need to remember when doing this sort of thing is that it also has risks involved. That is, assuming they intend to keep driving on the road. The scoop will also draw in water, which could (depending on quality of filter used) then soak into intake - not good!

There is a guy in NZ that use to have a similar setup on his AE82 race car (has a blacktop in it). He ended up removing the scoop and reverting it back to a pod filter tucked up behind the passenger headlight.

I'm 99.9% sure this is how the 06/07/08 WRC subi's have their intake setup!

Here we are:
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