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  1. #1
    Non-member nath17t's Avatar
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    dump valves?

    dose a dump valve realy help the turbo to last longer or is it just a mith?

  2. #2
    Non-member TrixNFlix's Avatar
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    Re: dump valves?

    Oh christ , world war 3 is gonna break out.

  3. #3
    Member clee's Avatar
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    Re: dump valves?

    ith a mith ...depends on the application ,boost level and taste .....

  4. #4
    Non-member RoboEK's Avatar
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    Re: dump valves?

    I was reading through the articles earlyer and came accross this which somes it up quite nicley.

    Remember that Renault chose not to fit one as standard on the GT Turbo, yet most manufacturers do fit them as standard equipment (recirculating type) on turbocharged cars. The R5/R11 Turbo has quite a long boost path with reasonably wide hoses, so most pressure waves from the throttle shutting quickly are absorbed in the hoses, so you don't get the turbo damaging effect seen in cars with shorter paths. Hence a lot of people feel there's no need for a dump valve on a R5 GT Turbo or R11 Turbo.

  5. #5
    Member clee's Avatar
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    Re: dump valves?

    He's not got a 5

  6. #6
    Non-member RoboEK's Avatar
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    Re: dump valves?

    Yea i just presumed he was running a 1.4 not a 1.7, but still good info none the less

  7. #7
    Member clee's Avatar
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    Re: dump valves?

    I've run with and without on both the 21 and GTA .Can't say I've noticed any difference on either ..recirc,dump or none .

  8. #8
    Non-member tonesGTT's Avatar
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    Re: dump valves?

    Quote Originally Posted by nath17t View Post
    dose a dump valve realy help the turbo to last longer or is it just a mith?
    No, a dump valve does not really help. It's a myth

  9. #9
    Non-member Frix's Avatar
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    Re: dump valves?

    What is a Dump Valve?
    Most production turbocharged engines are fitted with a dump valve. This is to vent away excessive turbocharger boost pressure when the throttle is closed.
    All Sierra Cosworth and the original large turbo Escort Cosworth models use the same dump valve. The turbocharger fitted to the latest Escort Cosworth has its own integral unit.
    The dump valve is the black plastic saucepan shaped object that you will see connected between the intercooler and the air inlet hose to the turbocharger. You will also see a small hose leading from the top of the valve to the inlet plenim on the engine. Inside the valve is a rubber diaphragm and a steel spring, with a small insert to support the diaphragm where it seats against the dump valve body.
    The dump valve has basically two operating conditions; throttle open, and throttle closed. When the throttle is open, the boost pressure coming into the valve from below the diaphragm is equalled by the pressure onto the top of the diaphragm that comes via the small hose from the engine plenim chamber. As the pressures are equal, the spring holds the diaphragm onto its seat, and prevents the pressure venting away. When the throttle is closed, the pressure coming into the top of the valve is significantly reduced, (often to a vacuum), and the pressure below the diaphram lifts it away from its seat, allowing the excess pressure to vent away. As the throttle is reopened, the pressures again equalise, the spring pushes the diaphragm onto its seat, and the boost pressure cannot vent away.

    Why do manufacturers fit a dump valve?
    It is for a number of reasons. Without a dump valve, when the throttle was closed, the build up of boost pressure would be immense, very similar to closing a quickly flowing water tap. This excess of pressure, (which could be over five times the running boost pressure), would put the components of the system under a great strain. It would try to burst the intercooler and pipework. More significantly, it would put a large strain on the turbocharger itself, firstly stalling the compressor shaft, then trying to force the compressor wheel out of the turbo, against its bearings.
    So, the dump valve prevents mechanical damage to the intercooler & turbo pipework, prolongs turbocharger life, and prevents excessive turbo - lag that would be caused by the compressor shaft stalling.
    What can go wrong with a dump valve?The only thing that can go wrong with a dump valve is that the diaphragm can become holed. If this happens, it will not seal, and the boost pressure leaks away all of the time. This will cause the turbocharger to work harder to overcome the leak, (turbochargers will work as hard as they have to, to give the required boost), and this will be noticeable to the driver, as a lack of boost response.

  10. #10
    Non-member Brigsy's Avatar
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    Re: dump valves?

    Plenty of bs in the above paragraph. Total myth that a dumpvalve makes a turbo last longer imo. Less lag with dumpvalve?

  11. #11
    Non-member J$£5GTT's Avatar
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    Re: dump valves?

    the bigger the better,go for it!!!!....

  12. #12
    Non-member nath17t's Avatar
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    Re: dump valves?

    iv got a audi a3 1.8t and iv tuck it off just woundering if it will cause any damege or not it seems to be better without it

  13. #13
    Non-member J$£5GTT's Avatar
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    Re: dump valves?

    Quote Originally Posted by nath17t View Post
    iv got a audi a3 1.8t and iv tuck it off just woundering if it will cause any damege or not it seems to be better without it

    dump valve can cause problems with the engine management as there is a loss of system pressure. There are now VAG friendly dump valves that also recirculate the lost pressure keeping the ECU happy.you say it runs ok though?

  14. #14
    Non-member nath17t's Avatar
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    Re: dump valves?

    ye mate car runs fine

  15. #15
    Non-member Adam L's Avatar
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    Re: dump valves?

    I actually had some knob jockey call Turbo Dynamics to ask them if his thrust bearing would fail if he removed his dump valve. To be honest, that annoyed me, as I had my opinion thrown back in my face... However, he told me he'd let me know and I never heard back from him. That says alot.

    ****ing idiot.

  16. #16
    Non-member redrocket29's Avatar
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    Re: dump valves?

    iv got 2 dumps on my 5 is it bad they were on when i brought it should i remove 1?

  17. #17
    Non-member Shane P's Avatar
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    Re: dump valves?

    Gonna get a custom boost pipe made up for 6 of the buggers, 3 facing forwards and 3 facing backwards with pink vacuum hosing, should be a record

  18. #18
    Non-member JRP's Avatar
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    Re: dump valves?

    Quote Originally Posted by redrocket29 View Post
    iv got 2 dumps on my 5 is it bad they were on when i brought it should i remove 1?
    Bin both of them, they are gay

  19. #19
    Non-member mlb123's Avatar
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    Re: dump valves?

    i'd think if your running anything over 14psi you should consider a dumpvalve, if you dont like the noise you could always go the recirculating route....

    as for renault not fitting them as standard id say its due to the turbo being so small, when your cruising down the motor way there a pain in the ass becuase the turbos wind up at such low revs your continuously dumping as you control the throttle!!!! i have a blanker which i fit if im going on a long journey.

  20. #20
    Non-member Brigsy's Avatar
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    Re: dump valves?

    Quote Originally Posted by JRP View Post
    Bin both of them, they are gay

  21. #21
    Member clee's Avatar
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    Re: dump valves?

    A dump valve will harm nothing apart from your RTOC credibility rating Mine is under review as I have a mixed bag of non 5 stuff so 'they' aren't sure what's what

  22. #22
    Non-member rs250nut's Avatar
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    Re: dump valves?

    Quote Originally Posted by GanJaMan View Post
    Gonna get a custom boost pipe made up for 6 of the buggers, 3 facing forwards and 3 facing backwards with pink vacuum hosing, should be a record
    Gt tuning used to fit three to some of their cars claiming it aided spool up, charging **** loads of money for what were standard cossie dumpvalves with shiney alloy covers.

  23. #23
    Non-member TrixNFlix's Avatar
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    Re: dump valves?

    Quote Originally Posted by JRP View Post
    Bin both of them, they are gay
    Enjoy them for what they are, an amusing noise. Granted this sound can get anoying sometimes, but I bet most members on here have had one at some time!

  24. #24
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    Re: dump valves?

    Quote Originally Posted by TrixNFlix View Post
    Enjoy them for what they are, an amusing noise. Granted this sound can get anoying sometimes, but I bet most members on here have had one at some time!

  25. #25
    Non-member TrixNFlix's Avatar
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    Re: dump valves?

    You know I speak the truth

  26. #26
    Non-member Junglist's Avatar
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    Re: dump valves?

    Quote Originally Posted by mlb123 View Post
    when your cruising down the motor way there a pain in the ass becuase the turbos wind up at such low revs your continuously dumping as you control the throttle!!!!.
    i miss that , although now even without a dumpvalve it still makes a loud enough noise with the wastegate flutter/chatter ,

  27. #27
    Non-member JRP's Avatar
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    Re: dump valves?

    Quote Originally Posted by Scoff View Post
    For folks running a lot of boost and considering one of those stupid forge "group-A" fisher price things, here's s nugat of information for you:

    I've seen engines fail when a diaphram has split because the AEI pipe was connected to the same line as the dump valve. The leak in the vac pipe caued the AEI to see less boost, so ignition timing took a climb for the worse. Those things want melting down and making into something usefull.
    Nothing possibly can be useful from group A d/v metal.. its scrap

  28. #28
    Member clee's Avatar
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    Re: dump valves?

    But that's just down to plumbing ,not the DV's fault .Keep all computer/sensor signals pure and you should not see any issues ?

  29. #29
    Non-member mlb123's Avatar
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    Re: dump valves?

    Quote Originally Posted by Dan y View Post
    i miss that , although now even without a dumpvalve it still makes a loud enough noise with the wastegate flutter/chatter ,
    yeah i love that flutter noise, i'd much rather hear that then my dumvalves psthhh....
    i had to fit a valve in the end though because my boost gauge is connected to an outlet on the turbo housing and when it fluttered my boost gauge needle did too and hopped back and forth with the flutter, so i realised it wasn't doing my turbo much good

  30. #30
    Non-member Duncan Grier's Avatar
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    Re: dump valves?

    Quote Originally Posted by Dan y View Post
    i miss that , although now even without a dumpvalve it still makes a loud enough noise with the wastegate flutter/chatter ,
    Wastegate flutter is a made up word, they dont make a noise.

    Some new type engines vag etc can sometime throw up an error without one but the ecu is programmed to have that compressed air going back to the turbo via recirc. Can lead to running leaner for a very brief time during recirc. Do not think it would kill anything but no point removing if designed to run. Vaux LEH use boost solinoids and recirc to bleed boost.

    Piston type recirc gets around the diaphram spliting issues

    Each to their own

    DG

  31. #31
    Member clee's Avatar
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    Re: dump valves?

    But he's not got a 5 I think I already said that obsessed some people ......

  32. #32
    Member D4WNO's Avatar
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    Re: dump valves?

    Quote Originally Posted by Duncan Grier View Post
    Wastegate flutter is a made up word, they dont make a noise.
    Indeed, for those not in the know, that noise you hear is infact compressor surge

  33. #33
    Member clee's Avatar
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    Re: dump valves?

    Quote Originally Posted by D4WNO View Post
    Indeed, for those not in the know, that noise you hear is infact compressor surge

  34. #34
    Non-member Duncan Grier's Avatar
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    Re: dump valves?

    Quote Originally Posted by clee View Post
    But he's not got a 5 I think I already said that obsessed some people ......
    LOL but you never explained it

    I have had 3 R5's :P but found they drive the wrong wheels

  35. #35
    Non-member Shane P's Avatar
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    Re: dump valves?

    Quote Originally Posted by D4WNO View Post
    Indeed, for those not in the know, that noise you hear is infact compressor surge
    Which is?

  36. #36
    Member clee's Avatar
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    Re: dump valves?

    Quote Originally Posted by Duncan Grier View Post
    LOL but you never explained it

    I have had 3 R5's :P but found they drive the wrong wheels

    aiii, wrong, wrong ,all is wrong

  37. #37
    Non-member The new Bill J's Avatar
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    Re: dump valves?

    Quote Originally Posted by clee View Post
    But he's not got a 5
    So why post? After all, this is the R5 owners club

  38. #38
    Member clee's Avatar
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    Re: dump valves?

    I'm trying to build bridges
    Feck me! it's like living in Cockermouth

  39. #39
    Non-member Duncan Grier's Avatar
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    Re: dump valves?

    Quote Originally Posted by The new Bill J View Post
    So why post? After all, this is the R5 owners club
    How is that evo lol

  40. #40
    Non-member The new Bill J's Avatar
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    Re: dump valves?

    Quote Originally Posted by Duncan Grier View Post
    How is that evo lol
    It's currently parked next to my R5

  41. #41
    Non-member Duncan Grier's Avatar
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    Re: dump valves?

    Good come back got half a R5 in the shed in spares - does that count?

  42. #42
    Non-member newbstar*'s Avatar
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    Re: dump valves?

    Quote Originally Posted by Duncan Grier View Post
    Good come back got half a R5 in the shed in spares - does that count?
    NO

  43. #43
    Non-member The new Bill J's Avatar
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    Re: dump valves?

    Quote Originally Posted by newbstar* View Post
    NO


    Goodbye Grier

  44. #44
    Non-member Penfold aka The Dealer's Avatar
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    Re: dump valves?

    3 out of 4 of my 5's have run DV's... including the cup car - although now been removed...

    Each to there own, i personally like the dumbvalve noise, but love the compressor surge...

    Really dont see the point in having 2 or 3 dumpvalve's... although helps tuner's profits.

  45. #45
    Non-member Mart's Avatar
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    Re: dump valves?

    Wow, another dump valve thread.

    We're well overdue another Cup mod' thread...

  46. #46
    Member clee's Avatar
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  47. #47
    Non-member hydrotec78's Avatar
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    Re: dump valves?

    Quote Originally Posted by clee View Post
    http://www.youtube.com/watch?v=4UCZF...eature=related

    this dif ,,,opps i mean d v is better

  48. #48
    Non-member Penfold aka The Dealer's Avatar
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    Re: dump valves?

    Quote Originally Posted by hydrotec78 View Post
    http://www.youtube.com/watch?v=4UCZF...eature=related

    this dif ,,,opps i mean d v is better
    Seriously would love to have a go in that

  49. #49
    Non-member 5alldaway's Avatar
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    Re: dump valves?

    i ran a 5 with and without a dumpvalve on before, the boost pick up was noticably better without the dumpvalve

    i run a dumpvalve these days, not bothered how fast the car goes as long as i get to where i need to be

  50. #50
    Non-member hydrotec78's Avatar
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    Re: dump valves?

    It dose look a good laugh.

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