im jus about to fit a BOV to my 95 wrx... but the only place i can seem to put it is jus above where the current re circ valve is... but this is directly above the turbo... has anyone else fitted one in a different location or shld i jus go with above the turbo??

 

im gathering u dont apporve??

 

There was some discussion on here from people who knew what they were on about and the conclusion reached was that a vent to atmosphere BOV probably reduces performance and has the potential to damage the turbo, in fact under some circumstances it may even cause the turbo to spin in reverse.

I'm no expert and so only gathered this info from the discussions of those more informed than I but I suspect that Elmer's suggestion is probably a fairly good one.

Maybe you could search on the forums on here and see if you can find more details.

 

The location should be marked by Burberry

 

had one on my old classic for 4 years and had no probs whatsoever, best mod i did to the car.

got an sti type uk now, but not done the vta yet but you never know..

carl..

 

thanks for the serious replies guys.. didnt realise some subaru owners were so cranky...

 

I won't be asking you for advice then

By removing a large amount of measured (MAF) pressurised air from the intake the engine briefly overfuels as the AFR sensor has already confirmed the ratio in accordance with the MAF metered air. This leads to a rich partial burn in the cylinder and an amount of unburnt fuel being present after ignition. This excess fuel can be forced past the rings during exhaust compression removing the lubricating oil film and causing piston/cylinder wear. Over time the excess fuel can begin to thin the oil in the sump and cause many related problems. Unburnt fuel forced into the exhaust can ignite in the headers causing negative flow pressure, upsetting valves and gas flow. This negative pressure can cause the turbo to stall, causing excess stress on its bearings. The shock of the explosion within the exhaust can shatter catalysts, or when cold the unburnt fuel can make it onto the cat and contaminate it, shortening its lifespan. On the plus side, it does make a silly noise. A recirc does what it states, recirculates the air within the system maintaining the correct air/fuel ratio and slowing the turbo in a controlled manner to ensure smooth running. If you remove the intake resonator and fit a high flowing panel filter you can hear the recirc, as well as the induction and spool-up. The car will also spool up quicker and run slightly cooler, and for less money and no detremental effect on performance and/or reliability.

 

I have just put a high flow panel filter on my car, and it actually sounds like it has a really quiet BOV on it.
I wondered what the new noise was, but corradoboy has explained it very well to me. And he's right, it does spool up quicker but not sure it runs any cooler, although I just have the bog standard temp gauge to go by...

Dan.

 

Dan, in the front O/S wing there is a huge plastic bottle. The air that is drawn through the black plastic scoop which starts at the front of the engine bay above the O/S headlight passes through this restrictive piece of tatt to silence out the sounds we all know and love. By removing it (2 bolts and extraction through the wheel arch) along with the scoop (2 further bolts) and sealing off the wing apertures left from the engine bay the airbox is fed with loads of clean, cool air instead of the hot mucky stuff from in the engine bay. You should also remove the panel filter and effect a seal around where the airbox meets the wing too. On an 03-05 WRX you can also drill out a piece of the mounting plate (soft plastic) for the foglight to make the little vents in the fog surround actually functional instaed of cosmetic, to let more air into the wing.
The ram-air induction scoop is sat directly behind the rubber seal on the headlight and 2 further rubber seals along the bonnet leading edge, and so can only scrabble for air which makes it up past the radiator (the HOT radiator) and the hot mucky stuff circulating in the engine bay itself.

One note of caution, DO NOT get giddy with this idea and think about ducting directly from the front of the car into the airbox as you will kill the MAF with all the dirt, water and oil that will overpower your filter. It works just fine with the air left to circulate freely in the wing where all the crap is kept low down by gravity.

 

I think Corradoboy's discussion of the BOV should be made some sort of techie sticky as it is excellent. I sort of knew there was bad stuff involved but it explains it very well and in a few sentences.