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Mod: Fitting a Blow Off Valve (04 Impreza WRX)
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Old 07 Nov 2006, 09:58 AM   #1 (permalink)
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Mod: Fitting a Blow Off Valve (04 Impreza WRX)

Four steps to fitting a BOV (04 WRX in this case)

Fitting a Blow Off Valve to an 04 WRX (This one was HKS SSQV)

Terminology used:

Re-circ = Re-circulation
VTA = Vent to Atmosphere
BOV = Blow Off Valve

Step 1
Spending
Firstly go out and buy yourself a new BOV – I opted for the HKS Super Sequential which is quite loud I had this particular one from Hong Kong through a friend… Only thing that was a problem – all Hong Kong text!







Step 2
Some Prep work….
Take your trusty rag and give the area below a little wipe down as to clear ant debris. I wasn’t designed to be a mechanic so don’t like to get all greased up

The OEM Valve that re-circulates the air can be seen below center connected to the intercooler and hose.

Note* - Be careful of the gasket and bolts don’t drop away into the oil pan below!
Loosed up the bolts with spanner and loosen hose clip underneath valve. Also gently pull away hose connected to valve via long nipple.






You should end up with something looking like below: -






Now whip that valve out of the engine bay and prepare for something new!






Step3
The nitty gritty
Your new BOV should have been supplied with a bung of some sort (if not you need to buy one) – With the HKS SSQV it ships with a nice shiny aluminium bung… Use a little lube at this point to get that bung stuck in there like a good un – It’s a little tight going in but the lube really helps… You should now be in a position like below:








Step4
The fitting of the new BOV
Now we have bung in place and all bits accounted for its time to screw down that new shiny BOV… Get the bolts back on the flange an anchor back to the intercooler. Put other hose back onto nipple and your done! That’s it honest! A nice and simple but noticeable modification…






And…







If you know the spanner size please reply as I could have mentioned that but couldn’t remember the size…

Gareth

Last edited by skylight; 19 Dec 2006 at 08:36 AM.
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Old 18 Dec 2006, 08:18 PM   #2 (permalink)
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fitting blow off valve to 06 sti

hello mate great fitting pic's could you tell me if it's the same procedure for a 06 sti
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Old 18 Dec 2006, 10:07 PM   #3 (permalink)
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Should be same setup
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Old 19 Dec 2006, 09:01 PM   #4 (permalink)
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Done this not long back on my 04...Only differance was I removed the HKS VTA and fitted the STD kit back on... HKS VTA in the bin at Tiley's...
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Old 19 Dec 2006, 10:20 PM   #5 (permalink)
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Does a my 98 standard bov look the same as the one in the 2nd pic. Im thinking about removing my baileys bov and replacing with a standard one
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Old 20 Dec 2006, 08:27 AM   #6 (permalink)
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Quote:
Originally Posted by bob View Post
Done this not long back on my 04...Only differance was I removed the HKS VTA and fitted the STD kit back on... HKS VTA in the bin at Tiley's...
Funny you should mention this... I went in that bin - JOKE I done the same thing - month later a reversed the action and put the vtv back on!

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Does a my 98 standard bov look the same as the one in the 2nd pic. Im thinking about removing my baileys bov and replacing with a standard one
All very similiar in design to this yes mal. see RB5 engine (99) http://www.subaru-impreza.org/images...engine/1-7.htm

Last edited by skylight; 20 Dec 2006 at 08:30 AM.
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Old 20 Dec 2006, 03:04 PM   #7 (permalink)
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Thanks Gareth......

Think thats my first project for the new year. Change back to standard dump valve
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Old 22 Feb 2007, 08:15 PM   #8 (permalink)
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May seem like a silly question, but what is the advantage of an aftermarket dump valve ?

Does it actually improve power, performance or economy ?

Or does it just make a nice psssstt noise ?
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Old 22 Feb 2007, 09:10 PM   #9 (permalink)
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Quote:
Originally Posted by Scooby1Kanobe View Post
May seem like a silly question, but what is the advantage of an aftermarket dump valve ?

Does it actually improve power, performance or economy ?

Or does it just make a nice psssstt noise ?
There is a lot of debate on Forums regarding Dump Valves. I have the HKS SSQV as above and car runs fine and sounds good (IMO).

On some cars a VTA (vent to atmosphere) DV can upset the car. Mine has PPP and is running fine with a VTA DV.

It's a personnal thing, no increase in BHP but can improve spool up time (so some say)
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Old 02 Aug 2007, 09:16 PM   #10 (permalink)
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12mm bolt heads
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Old 21 Nov 2007, 06:29 AM   #11 (permalink)
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Hummmmmmmmmmmmmmmm over £100 notes for something that prob won't improve performance and might even cause problems then end up in the bin hummmmmmmmmmm tough one that NOT lol.........................my old golf had standard Re-circulation valve but after an air filter and re-map you could hear it chatter like a Audi Quattro rally car sweet.
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Old 21 Nov 2007, 06:30 AM   #12 (permalink)
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Sort of a "chi chi cho cho cho" if ya catch my drift lol
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Old 21 Nov 2007, 12:06 PM   #13 (permalink)
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Hows it go again
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Old 21 Nov 2007, 03:10 PM   #14 (permalink)
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Hows it go again
"chi chi cho cho cho" .... ...
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Old 21 Nov 2007, 07:06 PM   #15 (permalink)
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You got it pete pmsl..................
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