prodriverules

iTrader: (52)

HKS one mate but i have to as the airbox won't fit with FMIC pipe's running through that area now,most all FMIC kits require a cone filter fitting at the same time on classic and newage.

budgie smuggler

Do you think that the hks makes a difference on standard bugeye

BrownPantsRacing

iTrader: (6)

No dump valve makes a difference to performance. In fact as said, they all dump air prior to the sensor so create more fueling problems than the standard recirculating units.

That said, I have the HKS ssqv as the sound is brilliant. Cant beat it! haha.

rickya

iTrader: (18)

APS Dual Blow off valve

http://www.airpowersystems.com/wrx/blow.htm

Scooby Arthur

iTrader: (2)

Pic of my Tial

tony_xs

i had a bailey on my classic sti it was crap found out that when it was mine u went on full boost it would kill the power which aint good when over taking. my blod eye has the oem fitted at the min but im am tempted with a dv again

harvey

iTrader: (48)

As far as I am concerned any money spent on a BOV is wasted money unless it is done for expediency.
There is nothing wrong with the OE BOV on any Subaru.
If you are retaining the MAF sensor you are best to stay recirc.
If you ditch the MAF sensor you can go VTA and sometimes for expediency we use the Forge STi 4 VTA simply because it is easy to fit to a Hybrid FMIC installation. Just over £100 from memory, reliable and forget item.
I don't understand the logic of spending £200 plus on fancy HKS, Blitz and APS BOVs all of which from first hand experience can lead to running issues that make them non starters for me. If you are prepared to spend £200 plus for a bit of noise and a reduction in performance that is a strange choice.
If you are asking how much boost you can run on the standard BOV or is there a BOV that can help reduce turbo lag I think you don't understand exactly how a BOV works and it might be worth doing some research before you blow a lot of money for no return other than a bit of noise.
BTW, a bit of free advice, drill a couple of 3mm holes in your downpipe before the exhaust section and get your mapper to over fuel slightly on overrun. That will give you plenty noise for no expense.

ScoobyForLife27

iTrader: (14)

Cheers Guys !
Where can I find some info how to go back to standard one ? I bought a Brand New standard OEM one but don`t really know how to fit it. I am running Baileys one which was fitted when I bought the car. Will try to put some picture of my engine bay if that will help. My car is V2 Sti.
Thank You

budgie smuggler

You tube has some good stuff on it about replacing parts.but it should be just a case of taking non original one off then mounting new one, which will have a place to mount a pipe at the front of bov.Located around the non original one should be a pipe with maybe a silver blanking plate secured on it take that out and secure pipe to original bov at the front.That's what it was like on my 52 plate Bugeye Sportwasgon.Sorry hope that makes sense.

ScoobyForLife27

iTrader: (14)

Standard Dump Valve has got 3 pipes ( 2 large and 1 small ) and Baileys I`m running at the moment has got only 2 ! How to fit the old one back ?

Hope this will help

ScoobyForLife27

iTrader: (14)

Sorry :-)

http://i1103.photobucket.com/albums/...pablo27/dv.jpg

ScoobyForLife27

iTrader: (14)

And that is the OEM one with 3 pipes

budgie smuggler

does this bov recirculate the air

WRX Blues

I have a GFB WRX Hybrid from Scoobyclinic - it re-circulates as well as vents to atmosphere so you get the best of both worlds. Run for 40k with no impact on performance, etc and if you happen to like the noise of a VTA it sounds pretty cool too.

That said, I am now switching to something which is slightly more stealthy - think I'm getting old.

barnshaw

iTrader: (1)

i have the above mentioned APS recirculating valve and its fantastic, they do one if your running a TMIC and one for FMIC aswell

Stoff1

iTrader: (3)

just out of curiosity and probably sounding stupid but on some of the high powered cars there is a really aggressive type dumping sound(almost sounds like a pigeon on steriods) is this down to the turbo set up or what?

musso2010

Compressor stall is what i think you are refering to.

DCI Gene Hunt

Dump Valves....

Stoff1

iTrader: (3)

Hmmm what's this?

awdx4

"Turbocharged engines operating at wide open throttle and high rpm require a large volume of air to flow between the turbo and the inlet of the engine. When the throttle is closed compressed air will flow to the throttle valve without an exit (i.e. the air has nowhere to go).
This causes a surge which can raise the pressure of the air to a level which can damage the turbo. If the pressure rises high enough, a compressor stall will occur, where the stored pressurized air decompresses backwards across the impeller and out the inlet. The reverse flow back across the turbocharger causes the turbine shaft to reduce in speed more quickly than it would naturally, possibly damaging the turbocharger. In order to prevent this from happening, a valve is fitted between the turbo and inlet which vents off the excess air pressure. These are known as an anti-surge, diverter, bypass, blow-off valve(BOV) or dump valve. It is basically a pressure relief valve, and is normally operated by the vacuum in the intake manifold.

The primary use of this valve is to maintain the turbo spinning at a high speed. The air is usually recycled back into the turbo inlet (diverter or bypass valves) but can also be vented to the atmosphere (blow off valve). Recycling back into the turbocharger inlet is required on an engine that uses a mass-airflow fuel injection system, because dumping the excessive air overboard downstream of the mass airflow sensor will cause an excessively rich fuel mixture (this is because the mass-airflow sensor has already accounted for the extra air which is no longer being used). Valves which recycle the air will also shorten the time needed to re-spool the turbo after sudden engine deceleration, since the load on the turbo when the valve is active is much lower than if the air charge is vented to atmosphere."