Got bored, so i made a new intake

Gannon · Post by **Gannon** » Wed Dec 30, 2009 6:38 pm

First week of my holidays and its been raining since monday. Not happy, i had heaps planned.

Anyway, i got bored and got thinking about the tiny size of the intake on my Outback, so i went to the hardware and bought two 90, one 45 and one 22 degree 90mm stormwater bends.

I got a 90mm holesaw and cut a bigger hole in my airbox, and then used the bends to connect it to the over radiator intake funnel.

It isnt finished yet, im gonna drive it for a week and see how it goes, it needs a support bracket and its kinda noisy at low revs (sounds awesome above 4000rpm) so im thinking of grafting the resonator back on.

Pics

Not bad for about $17 in materials

steptoe · Post by **steptoe** » Wed Dec 30, 2009 7:15 pm

I used 50mm PVC pipe from the same family as your bits and the heat under the bonnet of the GLTA caused the stuff to collapse.

wrxer · Post by **wrxer** » Wed Dec 30, 2009 7:24 pm

looks good and free flowing.
the resonator is a known restriction and gives you couple of free kw if you bypass it. hope the heat doesnt kill it.
i got a kit from supercheap for 70 bucks, with a heap of ali bends and straights and rubber joiners.

discopotato03 · Post by **discopotato03** » Wed Dec 30, 2009 8:07 pm

I don't suppose there is a larger airbox and panel filter in the Subaru range that fits in the original space is there ?
The thing is that all ya have in an atmo charged engine is atmospheric pressure to feed it so the lowest restriction system is the one that gets all the available pressure to charge the cylinders .
Of course cool air is dense air so cool is er cool ...

Sometimes people chase cool air from the inner side of the inner guard but maybe not the best in an off roader - particularly if you take it swimming .

Really having warm air is of little consequence at low speeds and loads , its higher loads where the throttle is open wider at low revs that hot air detonation can be a problem .
That thing should have reasonably sophisticated knock control so you wouldn't hear it ping but retarded timing takes the wind out of the sails a bit .

Maybe if really keen you could get one of the better AWD dyno mobs to retune its computer and reflash its memory - if it has flash memory that is . I've no idea how soft Subaru has those engine management systems .

Another option on some of those EJ's is to turn the plenum section around so that the induction faces forwards - less roar . Dunno what you do for ducting on an NA one though .

Always options to play with .

PS Don't ya hate this time of year when nothings open and skilled friends go postal .

Cheers A .

AlpineRaven · Post by **AlpineRaven** » Wed Dec 30, 2009 9:08 pm

yeah it'll give you better power output... but be careful when you drive in water in nose, once water gets in your engine... zzziiiipppp... goodbye!
Cheers
AP

GOD · Post by **GOD** » Wed Dec 30, 2009 9:53 pm

AlpineRaven wrote:yeah it'll give you better power output... but be careful when you drive in water in nose, once water gets in your engine... zzziiiipppp... goodbye!
Cheers
AP

Yep, and then you get stuck into the engine with a 9" grinder, eh Gannon? Not likely to be a problem though - that's the standard Outback intake position, and seems to work well.

If you're interested in doing a stage 2, I'd aim to bend or replace that intake funnel to give the air a straighter path straight back towards the airbox entry. Looks good now though.

Dane.

Gannon · Post by **Gannon** » Thu Dec 31, 2009 8:56 am

GOD wrote:Yep, and then you get stuck into the engine with a 9" grinder, eh Gannon?

He he!

The little bit on the end of the funnel is a woeful restriction. Thats why i cut it off and heated the funnel up and jammed the piece of 90mm pipe up there. Its much larger now.

Im gonna use one of these

halfway, as a place for any water to fall into, and i'll drill a little hole in the bottom. It may also quieten it down a bit

T'subaru · Post by **T'subaru** » Thu Dec 31, 2009 11:53 am

[quote="GOD"]Yep, and then you get stuck into the engine with a 9" grinder, eh Gannon?

Rough day at work today, thanks for the chuckles

discopotato03 · Post by **discopotato03** » Thu Dec 31, 2009 12:50 pm

I should have thought of this earlier , does anyone do a "Safari" type snorkel for those cars . Probably means a hole in the sheetmetal to get it out of the bay ...

A .

Gannon · Post by **Gannon** » Thu Dec 31, 2009 1:20 pm

You would have to be doing very well to get water into the intake funnel on the outback, i rekon the front of the bonnet would have to be under water before water was sucked up over the top of the radiator. And even if it did, there are numerous channels and holes in the funnel to let the water out.

These pics compare the size difference between the original end of the funnel and whats in there now

Subaman · Post by **Subaman** » Thu Dec 31, 2009 1:33 pm

You would have to be doing very well to get water into the intake funnel on the outback, i rekon the front of the bonnet would have to be under water before water was sucked up over the top of the radiator.

It happens quite easy actually, a few members of the Suby club have been caught out by this allready.

Gannon · Post by **Gannon** » Thu Dec 31, 2009 1:47 pm

Subaman wrote:It happens quite easy actually, a few members of the Suby club have been caught out by this allready.

From driving in the rain, or from crossing rivers?

spike · Post by **spike** » Thu Dec 31, 2009 1:51 pm

i read earlyier i think from discopotato

cooler air is cool and it is.

in the race car for hill climbs and such im planning on running a hoop of ice with the intake pipe going through for the ea82 this might cool the air ever so slightly and thus give me an increase cheap power all .000000000005 kw of it

discopotato03 · Post by **discopotato03** » Thu Dec 31, 2009 7:53 pm

Ever notice how much better it goes on a cool dry day compared to a hot dry day ?

A .

spike · Post by **spike** » Thu Dec 31, 2009 8:04 pm

very muvh very much
dead of night we used to have a couple of street drags. NUFF SAID

my brothers car would crack 9.8 at 1am in winter
be lucky to get 11 in summer

steptoe · Post by **steptoe** » Thu Dec 31, 2009 11:34 pm

ice in the air box,,,,and it is now 2010 .....hic

fredsub · Post by **fredsub** » Fri Jan 01, 2010 10:23 am

got a "before" pic suparoo ? your obw appears to look different to mine.....

Gannon · Post by **Gannon** » Fri Jan 01, 2010 11:11 am

This isnt my car, but this is what it looked like

Basically the same as all 98-03 Gen3 Libertys and Outbacks. I believe 2001-2005 Imprezas and 2003-2007 Foresters are the same also

spike · Post by **spike** » Fri Jan 01, 2010 2:42 pm

there isnt a lot of ways you can cool air down before putting it into the engine.
turbos can run a intercooler but thats about it. unless you have massive compression, in theory you can run an intercooler or somthing then to suck hair through it but yeah theories need to be ttested
and common sense says it wouldnt work

riksta · Post by **riksta** » Fri Jan 01, 2010 11:32 pm

Subaman wrote:It happens quite easy actually, a few members of the Suby club have been caught out by this allready.

this mostly happens on deep creek crosings when the water comes over the bonnet (from going to farst), It all most happen to me one day, I dont think driving in the rain is enough to worry about.

Rik.