Which Dump Valve
24 February 2002, 09:44 PM
#1
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Looking at purchasing a new dump valve. Which make, model do you recommend?? The only ones ive heard & seen are Baileys & these coloured ones in Max Power. All help is much appreciated.
24 February 2002, 09:48 PM
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There was a post about dump-valves a while ago... There is a school of thought regarding vent-to-atmosphere (pssshshhh) dump valves being bad news, confusing the ECU and doing all sorts of stuff (higher fuel consumption, poor idling, damage etc etc).
On my MY94 WRX I had a bailey vent-to-atmosphere and just didn't get on with it, fuel consumption definately went up and it came off after a couple of weeks.
I was thinking about getting a recirculating type for my RB5, just to upgrade the stock model (plus they look nicer yadda yadda).
ta,
Matt.
On my MY94 WRX I had a bailey vent-to-atmosphere and just didn't get on with it, fuel consumption definately went up and it came off after a couple of weeks.
I was thinking about getting a recirculating type for my RB5, just to upgrade the stock model (plus they look nicer yadda yadda).
ta,
Matt.
24 February 2002, 09:56 PM
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Sorry to be thick, but how does a dump valve reduce fuel economy?? What does a dump valve actually do?? All i know is that it releases pressure making a piisssshhhhhhh noise. 
24 February 2002, 10:40 PM
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DTA is dump to atmosphere, the standard dump valve re-circulates back into the airbox... Which is part of the problem, when no air returns to the airbox with DTA, it screws up the fuelling. AFAIK.
I had one and it scared small children / passers by / old people etc. Also made the car cut at idle.
No performance gain... If you think your boost is high enough, that it would backpressure the tubo on let off, get a Forge Recirc, it probably has a bigger capacity and you will hear it more athough not to the same degree as an atmos. I found the K and N induction cone made a similar and more friendly noise, with a performance gain...
MB
I had one and it scared small children / passers by / old people etc. Also made the car cut at idle.
No performance gain... If you think your boost is high enough, that it would backpressure the tubo on let off, get a Forge Recirc, it probably has a bigger capacity and you will hear it more athough not to the same degree as an atmos. I found the K and N induction cone made a similar and more friendly noise, with a performance gain...
MB
25 February 2002, 12:42 PM
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HKS have an atmospheric BOV, however if you don't like the extra noise or it cause problems, for £12.00 you can buy an attachment which changes it to a recirculating kit.
Incidently for all the HKS BOV's we've sold, only one customer has wanted the attachment.
So maybe that means these don't cause many problems!!
David
Incidently for all the HKS BOV's we've sold, only one customer has wanted the attachment.
So maybe that means these don't cause many problems!!
David
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25 February 2002, 01:19 PM
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On my MY94 WRx it has had the pipe that goes back into the air box removed and just blocked off, now the recirculating dump-valve vents to air? and I don't have any problems. Should I change it for a HKS one or put the pipe back on.. I have had not problems and the owner before me has had no problems with it as well..
25 February 2002, 07:11 PM
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I've had a Baileys atmos dv on mine for a tank of petrol. Still managed to squeeze 280 miles out of my 60lt tank 
I think the main reason people think the fuel consumption goes up is cause you're reving the engine more just so you can hear the sound
Matt
I think the main reason people think the fuel consumption goes up is cause you're reving the engine more just so you can hear the sound
Matt
25 February 2002, 11:48 PM
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I don't think there's much in it preformance wise. If you want the noise get an atmos dv, if not, get a recirc.
Matt
Matt
26 February 2002, 05:00 PM
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Evo 5,
A dump valve releases pressure built up by the turbo when you let your foot off. The vlave opens allowing the trapped pressure to escape and lets the turbo keep spinning, so when you put your foot down there is no lag. Without it the turbo would stall and take a while to spin back up again. All turbo cars have them, nearly all recirculate for noise reasons.
Hope this helps.
MB
A dump valve releases pressure built up by the turbo when you let your foot off. The vlave opens allowing the trapped pressure to escape and lets the turbo keep spinning, so when you put your foot down there is no lag. Without it the turbo would stall and take a while to spin back up again. All turbo cars have them, nearly all recirculate for noise reasons.
Hope this helps.
MB
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