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Dump valve for high boost application
#1211567
07/05/2011 22:02
07/05/2011 22:02
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johnnybravoturbo
Unregistered
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johnnybravoturbo
Unregistered
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Does anyone know of a Dv that will hold over 2 bar without leaking, Tried Baileys,Hks and Forge and all have leaked under pressure. They were all second hand.
I hear turbosmart do some good ones??
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Re: Dump valve for high boost application
[Re: Easy]
#1211578
07/05/2011 22:23
07/05/2011 22:23
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Nixa
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Nixa
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dont use one no boost leak
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Re: Dump valve for high boost application
[Re: ]
#1211587
07/05/2011 23:03
07/05/2011 23:03
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GS_Racing
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GS_Racing
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try a new one,ive seen all of the above at over 2 bar
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Re: Dump valve for high boost application
[Re: ]
#1211589
07/05/2011 23:11
07/05/2011 23:11
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GS_Racing
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GS_Racing
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here is a bailey that dealt with circa 2.5bar on a t4,515bhp 421 lb/ft and ran 180mph back in 2001 at bruntingthorpe (to put it in perspective,an r1 ran against it and could only get to 176mph!) http://img.photobucket.com/albums/0703/MikeR/Sierra%20Photos/a4ad1bdf.jpg
Last edited by GS_Racing; 07/05/2011 23:12.
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Re: Dump valve for high boost application
[Re: ]
#1211603
08/05/2011 00:07
08/05/2011 00:07
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Biggenz
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Biggenz
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I have a Turboxs which can run up to 35psi(2.4bar) boost.
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Re: Dump valve for high boost application
[Re: ]
#1211765
08/05/2011 16:20
08/05/2011 16:20
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johnnybravoturbo
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johnnybravoturbo
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Cheers guys, Easy which make is yours.?
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Re: Dump valve for high boost application
[Re: ]
#1212571
10/05/2011 12:47
10/05/2011 12:47
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Davie
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Davie
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The Bailey valves are easily modified, if you strip them down and fit two washers to effectively act as shims it it increases the spring tension, common mod, the seals need to be in good nick though.
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Re: Dump valve for high boost application
[Re: ]
#1212589
10/05/2011 13:42
10/05/2011 13:42
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group5lancia
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group5lancia
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The spring rate really shouldn't come into it.
On boost, there is boost pressure on one side of the diaphram and boost pressure plus the spring pressure on the other side. So, unless there is a problem with the diaphram or it's sealing, or some problem with the a leak of boost pressure on the 'operating' side, all dump valves should be able to hold any boost pressure without leaking, as with everything working properly there is no pressure differential between either side of the diaphram.
Last edited by group5lancia; 10/05/2011 13:43.
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Re: Dump valve for high boost application
[Re: ]
#1212663
10/05/2011 18:56
10/05/2011 18:56
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Joined: Dec 2005
Posts: 17,367 Staffordshire
Nigel
Forum veteran
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Forum veteran
Joined: Dec 2005
Posts: 17,367
Staffordshire
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The spring rate really shouldn't come into it. Exactly right - the pressure feed to the DV is into the side, NOT the bottom. As long as it's oriented this way, any amount of boost pressure should not be able to lift the piston off its seat This is why the Coupe runs so much better with the softest spring - no boost leaks and it dumps excess pressure with the tiniest amount of vacuum
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Re: Dump valve for high boost application
[Re: ]
#1212792
10/05/2011 23:35
10/05/2011 23:35
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johnnybravoturbo
Unregistered
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johnnybravoturbo
Unregistered
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I have a good piece of testing equipment which utilises dry ice under pressure and nearly every coupe i have checked so far has had a leak above .7 bar initially and getting worse towards 1.5. However the spring being too strong may cause chatter which can potentially stall the compressor wheel in extreme cases. I was reading on another forum where they have removed the valve all together.
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