Bottle under air intake box?

[Jamie_uk]

Afternoon all, quick question, what's this bottle for and do I need to keep it on?

my guess is it's to drain water out the intake box but mine was just full of spiders etc. 

 

Was hoping to ditch it and fit mesh over the hole thinking it will improve air intake. 

Thanks

 

[Mark D]

If it's the one I'm thinking of, it's to help silence it a bit and hold a reservoir of air available for sudden acceleration

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[Jay762]

Got a similar one on mine - I put it down to a water catch tank, hadn't figured on an air reservoir.

Is your motor struggling at the moment - have you got a high flow panel filter fitted?

[Sandals]

Is it maybe the resonator?

[Jamie_uk]

2mm hole in the bottom figured was to catch water but could work as a resonator. Also have a small rectangular box halfway up the air intake pipe no idea what that's for perhaps that acts as a air resouvior  

 

struggles at 2-3k but I figure just bad gear choice. Put a piper cross panel in sharper response but still funny at that range 

[Sandals]

Have you put the box back on and see if it makes a difference?

[Jamie_uk]

Haven't removed the bottle yet wanted to know what It was first.

gonna pull it off tonight. 

The airbox is untouched as the filter WAs just a drop in replacement. 

 

From induction kit pictures they don't seem to use that bottle

[Sandals]

Yeh induction kits don't have any resonators... My resonator which i removed had a small hole in the bottom of it as well, like you said more than likely for drainage purposes

[Jay762]

The 2-3K is more likely the exhaust - resonance / back pressure waves etc, a back box as suggested would go some to smoothing that but exhaust powervalves were invented because of that flat spot

[Jamie_uk]

Sweet I'll take it out tonight, got some mesh to put over the open hole so it'll still drain and let more air in. Wanted the put some over the intake funnel? Scoop? Whatever it's called because the box fills with grass bugs and twigs but gonna be a pain with the shape.    Body repair aluminium mesh only 1.50 at Halfords ATM. 

 

Was hoping to put some behind my grills but tried taking them out last night but couldn't budge it think the whole front end comes off as one. Radiator needs cleaning out aswell. 

[Jay762]

Yup its an easy job to remove the bumper and then you can get to the back of the grills no issue - replacing with an sti item is an option (badges come off easily enough)

carbon fibre option here

http://www.ebay.co.uk/itm/Carbon-Fiber-Front-Mesh-Grill-Grille-for-2008-2011-2010-Subaru-Impreza-WRX-STi-/221802714469?hash=item33a478d565:g:PO0AAOSw~OdVgDUG

[Mark D]

Saw a program speed with guy Martin, they were racing a van, had some sort of problems with either speed or cooling or aerodynamics but they found out having mesh created quite a bit of restriction at speed

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[Jay762]

I saw the same - most enjoyable - mind you they did replace the standard ford lump with a US turbo V6 beasty, which they then tweaked a little .

The RX hatch has a front end that is more plastic than holes so you should be able to trade off one against the other by substituting a wrx or sti item and maintain enough airflow   

[Mark D]

Oooo that bottle, was thinking about the box :)

I drive a NA, when I floor the poor thing I get a slight whistle noise that is coming from that little drainage hole, so in my mind I pretend that I had done well in life and make myself believe the whistle is from a turbo (or two) :)

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[Jamie_uk]

Plenty holes in the front but they are so big a small child would get stuck in the radiator.  And strangely the holes for the airbox are tiny it's only the top 3 that divert up into the air feed which I didn't actually realise at first,   Was thinking about meshing behind the grills if I have time I'll pull out the underside fixings aswell. ill take a look at that Sti piece cheers mate. Like the normal grills just not all the crap they let through, and now the restricted airflow. 

Hopefully removing that bottle would let some more air into the box it's like it's not getting enough at low speeds. Curious to how loud it's gonna be now. Stuck an induction kit on my mates 1.4xsara it actually sounded alright 

 

mines NA aswell but I only get a whistle when I drop off the throttle it sounds like a jet engine slowing down

[Jay762]

I just make ptssssh sounds in mine when it changes gear

[Jamie_uk]

Haha I take my mate with a bottle of coke 

 

sounds a lot deeper now, good bit louder after 4.5k. Intake manifolds not as hot. Now to spend all night googling and checking out the replacement grill 

[Jamie_uk]

Thanks all for the help 

[Jamie_uk]

@Jay762 am I right in thinking the wrx parts will fit my car but sti won't because te front end is wider? Looking at some zunsport grills but they look like they fit ontop of the existing grills instead of replacing them

[Jay762]

I believe the center insert is the same across the models - The STI bumper is wider to blend with flared arches. Yes the Zunsport option fits over the front of the lower holes but behind the upper holes and inside bonnet scoop

[kershaw-330s]

It's a resonator and also helps give a consistent maf reading by keeping a constant pressure was thinking about removing mine but also it must help prevent water getting in so I've left mine on till I get an induction kit

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[kershaw-330s]

2mm hole in the bottom figured was to catch water but could work as a resonator. Also have a small rectangular box halfway up the air intake pipe no idea what that's for perhaps that acts as a air resouvior  

 

struggles at 2-3k but I figure just bad gear choice. Put a piper cross panel in sharper response but still funny at that range 

Applying wot under 3k is not recommended especially in higher gears dramatically increases the risks of ring-land failure

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[Jamie_uk]

might have to consider refitting it then, removed but put a mesh over it so water could still drain away.   think its actually losing pressure aswell, debated running a second intake to the hole but cant find anywhere suitable to run a pipe. 

 

oh hell thanks for the info, i presume 'wot' is throttle?  ill go back to lower gears keeping up the revs, runs better that way anyway and strangely fuel efficiency goes up. 

[kershaw-330s]

Yes wot = wide open throttle . it's somthing todo with the short stroke and just general big turbo and huge Pistons on the 2.5 try not to give it full beans below 3k

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[Jamie_uk]

Ah right. 2.0 NA, are they still an issue with ring land failure?  Naturally the dealership told me nothing of this big issue or any others