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'forge' style dump valve
#1368692
18/08/2012 00:07
18/08/2012 00:07
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rhodri
Unregistered
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rhodri
Unregistered
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Last edited by rhodri; 18/08/2012 01:01. Reason: Tired predictive text!
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Re: 'forge' style dump valve
[Re: ]
#1368723
18/08/2012 00:52
18/08/2012 00:52
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Joined: Dec 2005
Posts: 239 Surrey
20vt_alex
Making a profit
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Making a profit
Joined: Dec 2005
Posts: 239
Surrey
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It should be ok. Put it this way, there is no chance of it splitting like the standard Bosch one so therefore must be better!
LE 0174
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Re: 'forge' style dump valve
[Re: ]
#1368736
18/08/2012 01:07
18/08/2012 01:07
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rhodri
Unregistered
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rhodri
Unregistered
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Thanks guys. About two minutes ago I bid on one as it was auctioning for 10 quid and won it! Only a tenner so went for it. I'm ideally after a forge dv006 but half tempted to give this ago in the mean time. Need it to be a stronger than standard dv as putting my gtec1 chip in this weekend.
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Re: 'forge' style dump valve
[Re: ]
#1368883
18/08/2012 17:06
18/08/2012 17:06
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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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Need it to be a stronger than standard dv as putting my gtec1 chip in this weekend. DVs on a Coupe don't need to be strong, as the pressure should be on the side of the piston, not the end Most people with a Forge run the weakest spring, regardless of the state of tune - I have done for years
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Re: 'forge' style dump valve
[Re: ]
#1369090
19/08/2012 01:03
19/08/2012 01:03
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rhodri
Unregistered
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rhodri
Unregistered
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I was under the impression that if I'm running a constant 1.2 bar then the standard dv will eventually leak so that why i need to upgrade?
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Re: 'forge' style dump valve
[Re: ]
#1369143
19/08/2012 12:03
19/08/2012 12:03
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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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Yes, the standard DV isn't really up to holding increased boost, but it is the DV design, rather than the strength of the spring that is poor.
When correctly oriented, the pressure (ie the hose from the solid plastic pipe by the side of the camcover) should enter the side of the DV - that way ANY amount of pressure won't open the DV
The DV is operated by vacuum in the small-bore pipe - this lifts the piston in the DV and allows pressure to vent through it to the inlet ahead of the turbo
Because of this orientation, the DV spring only hs to be able to keep the piston seated - it doesn't have to "fight" the boost pressure - because of this, the DV spring can be really light.
If you fit a heavier spring, there will be times when the DV doesn't operate after you lift off the throttle, which could cause mild compressor stall
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Re: 'forge' style dump valve
[Re: ]
#1369153
19/08/2012 12:28
19/08/2012 12:28
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Joined: Dec 2005
Posts: 1,985 In an Audi
Taffy20vt
My life on the forum
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My life on the forum
Joined: Dec 2005
Posts: 1,985
In an Audi
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I fitted one of these to a Coupe about 5 years ago, it's fine and hasn't had any problems.
Ex 432bhp '00 Sprinty 20vt6 '17 S3 Sportback '69 Amazon 131
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Re: 'forge' style dump valve
[Re: ]
#1369167
19/08/2012 13:22
19/08/2012 13:22
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rhodri
Unregistered
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rhodri
Unregistered
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good stuff and thanks for the info nigel. assume using the harder springs on a forge and causing compressor stall would account for the pigion sound. when i do finally get a forge i will make sure i get the green spring. but for now im glad this option is ok to use on my car
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Re: 'forge' style dump valve
[Re: ]
#1369489
20/08/2012 13:45
20/08/2012 13:45
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rhodri
Unregistered
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rhodri
Unregistered
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missed chrissy's post. have just contacted the seller to ask about spring strengths. hoping this would be similar to a forge dv006 green spring, however I dont think he will know.
If I do hear compressor stall, then I will remove and get forge/baileys immediately.
thanks all.
--update -->
ebay seller confirms you can change the spring on this valve (buy from forge) and it currently has a spring suitable for 'standard to slightly higher boost'. so whether that would mean 1.2 bar i dont know
Last edited by rhodri; 20/08/2012 14:05. Reason: spring info
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Re: 'forge' style dump valve
[Re: chrissy]
#1376423
11/09/2012 04:04
11/09/2012 04:04
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Joined: Feb 2008
Posts: 1,726 London
kj16v
My life on the forum
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My life on the forum
Joined: Feb 2008
Posts: 1,726
London
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I bought one of those for my Leon Cupra R, It was fitted with too stiffer spring, I tested the car and had turbo surge from it not functioning freely enough and bent my turbo blades intake side, Cost me £500 in total!
Buy Forge / Bailey etc.
Or be sorry. Wow. Really?? What convinced you that it was running with a non-opening DV that caused the failure and not, for example, worn bearings, or foreign object ingestion (eg, grit)? Not that I don't believe you, I'm just very interested to find out as more about the circumstances. I've been searching for proof of the woes of running without a DV for ages and you're literally the first in all my knowledge and seemingly the whole of the internet who's actually attributed a turbo failure to a non-functioning DV. I even contacted Owen Developments recently and they couldn't give me any examples of turbo failures due to not running a DV - in fact they said they run their own race cars without! Can you remember more details about the turbo; age, boost? Do you have any pics? You can PM me if it's going to throw this thread off-topic.
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