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  1. #1
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    dump valve

    Should my dump valve ppssssssshhht when i rev the engine or just when driving on boost ?
    Sorry

  2. #2
    Non-member Spooky's Avatar
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    Re: dump valve

    yes

  3. #3
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    Re: dump valve

    Quote Originally Posted by Spooky View Post
    yes
    Errm ! to which bit !!!

  4. #4
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    Re: dump valve

    I think the dump valve will whoosh when you releae your foot from the throttle (providing you provide enough revs ). Don't have to be driving.

  5. #5
    Committee, South East Regional Rep James5's Avatar
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    Re: dump valve

    Quote Originally Posted by Deano View Post
    Errm ! to which bit !!!
    Yes it will make a noise when you rev it @ a stand still.

  6. #6
    Non-member jantheeven's Avatar
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    Re: dump valve

    Yes... when you stand still and rev the engine to the point where the turbo starts to spin, you will hear a pssssshht when you release the accelerator pedal
    That's what a dump valve does: it releases the pressure the turbo built up, to allow it to continue spinning. So, this also happens when you're not driving...

  7. #7
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    Re: dump valve

    Thought there was something up !
    Mine doesn't , it just does it when i let off at around 3k or over, any ideas ?

  8. #8
    Non-member Spooky's Avatar
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    Re: dump valve

    Quote Originally Posted by Deano View Post
    Errm ! to which bit !!!
    yea to both

  9. #9
    Non-member Spooky's Avatar
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    Re: dump valve

    might be sticking or you could have a vac leak

  10. #10
    Non-member jantheeven's Avatar
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    Re: dump valve

    Quote Originally Posted by Deano View Post
    Thought there was something up !
    Mine doesn't , it just does it when i let off at around 3k or over, any ideas ?
    Well that's normal then... that's when a standard T2 will start spinning... no worries mate

  11. #11
    Non-member jantheeven's Avatar
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    Re: dump valve

    Quote Originally Posted by Spooky View Post
    might be sticking or you could have a vac leak
    No it's fine mate... under 3k revs the turbo won't start spinning, so you won't hear a psssshh when you let off then... only above 3k revs when the turbo is starting to build up pressure

  12. #12
    Non-member Spooky's Avatar
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    Re: dump valve

    ignore me, having a funny 5 mins

  13. #13
    Non-member jantheeven's Avatar
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    Re: dump valve

    Quote Originally Posted by Spooky View Post
    ignore me, having a funny 5 mins

  14. #14
    Non-member R5GTTRaider's Avatar
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    Re: dump valve

    Quote Originally Posted by jantheeven View Post
    No it's fine mate... under 3k revs the turbo won't start spinning, so you won't hear a psssshh when you let off then... only above 3k revs when the turbo is starting to build up pressure
    well mine spools up at 2k!!

    plus mine dosnt toosh if reving at stand still but thats coz dont full throttle it, mine dv dosnt shut sometimes which is doing my nut!!

    i used atf oil to lubricate both pistons on my dv suppose this is to hevy and need wd40 or gt 80 ?? as thats got teflon in it.

  15. #15
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    Re: dump valve

    Cheers guys, i went looking at a 5 yesterday and his DV was PSSHHT'ing all over the shop when he was revving, but he was giving it some beans
    Even so mine sounds puny compared to the sound his was making

  16. #16
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    Re: dump valve

    Quote Originally Posted by Deano View Post
    Cheers guys, i went looking at a 5 yesterday and his DV was PSSHHT'ing all over the shop when he was revving, but he was giving it some beans
    Even so mine sounds puny compared to the sound his was making
    If he had a big ol air filter then it could be just that, big cone filter- they can make a load of noise !

  17. #17
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    Re: dump valve

    Nah was definately the DV, maybe mines a bit weak or something

  18. #18
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    Re: dump valve

    Quote Originally Posted by Deano View Post
    Nah was definately the DV, maybe mines a bit weak or something
    well he could have a double piston dv i have a double one, and its alot louder than the rubber one i had

  19. #19
    Non-member jantheeven's Avatar
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    Re: dump valve

    I have the Forge "group A" DV with single piston and it's very loud
    Also depends on your boost of course... when I let off at a boost of 10 psi there's a little psssshhh... and when I apply full throttle and let off @ 20 psi you would think someone pulled the air valve out of a car tire

  20. #20
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    Re: dump valve

    haha
    mines 14psi and sounds loud. tho if hes running 8/9 im sure it wouldnt sound much louder than a mouse sneezing

  21. #21
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    Re: dump valve

    the chump valve that was fitted on my 5 when I got it gave up the ghost after afew weeks, sounded gay anyway, like a lame fart, but after one gearchange its started to whoooosh, nice technical term, while accelerating, and i was losing boost, so now running no valve, less things to leak boost without one.

  22. #22
    Non-member jantheeven's Avatar
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    Re: dump valve

    Having a dv doesn't just give a nice sound... it certainly has a function! It reduces turbo wear and keeps the turbo spinning faster when changing gears, reducing lag after a gear change

  23. #23
    Non-member Tiny Tim's Avatar
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    Re: dump valve

    Quote Originally Posted by jantheeven View Post
    Having a dv doesn't just give a nice sound... it certainly has a function! It reduces turbo wear and keeps the turbo spinning faster when changing gears, reducing lag after a gear change
    Is that why they came with them as stadard?

  24. #24
    Non-member BriC's Avatar
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    Re: dump valve

    Quote Originally Posted by Tiny Tim View Post
    Is that why they came with them as stadard?
    Wait.. They came with them as what?

  25. #25
    Non-member Tiny Tim's Avatar
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    Re: dump valve

    Quote Originally Posted by BriC View Post
    Wait.. They didn't have them as what?
    Stadard. My keyboard's lost a butto

  26. #26
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    Re: dump valve

    Quote Originally Posted by Tiny Tim View Post
    Stadard. My keyboard's lost a butto

  27. #27
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    Re: dump valve

    flick it out of a unused button say like insert or something and pop it in the n button


    back to dump valves, ,mines a twin piston, should it be lubricated or left dry?

  28. #28
    Non-member Tiny Tim's Avatar
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    Re: dump valve

    Twin piston might be your problem. They're designed to work with cars that have a MAF (like mine) so they dont affect idle. You sir need a single piston I believe.

  29. #29
    Non-member Russgt5's Avatar
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    Re: dump valve

    I bought a bailey "grp A" dv around 7 years ago but it never "whooshed" much while revving the engine with the car stationary but it was damn loud whilst driving on road........i rang Bailey at the time and they said the grp A valves dont work properly/to its maximum potential unless the engine is under load.

  30. #30
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    Re: dump valve

    Quote Originally Posted by Russgt5 View Post
    I bought a bailey "grp A" dv around 7 years ago but it never "whooshed" much while revving the engine with the car stationary but it was damn loud whilst driving on road........i rang Bailey at the time and they said the grp A valves dont work properly/to its maximum potential unless the engine is under load.
    That will be why mines not Pssst'ing then ! good work

  31. #31
    Non-member jantheeven's Avatar
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    Re: dump valve

    Quote Originally Posted by Tiny Tim View Post
    Is that why they came with them as stadard?
    Hey... that's what I've been told by people on this forum, years ago. Sounded logical too in my opinion. And the fact that Renault didn't install them as standard doesn't mean they're useless... or am I wrong here? I mean... there are numerous parts that could have been designed better... like in every car.

  32. #32
    Non-member Russgt5's Avatar
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    Re: dump valve

    From what i have read/seen most NEW turbo cars have recirculating dv's as standard (like the audi TT) so maybe they do help in some cases?.

  33. #33
    Non-member jantheeven's Avatar
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    Re: dump valve

    Plus... a lot of high performance turboed rally cars also have dump valves... surely that's gotta have a reason...

  34. #34
    Non-member Misky's Avatar
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    Re: dump valve

    If i chop my samco boost hose and replace the d.v section with stainless/ally pipe wih no d.v outlet would that be ok, or would it ruin the turbo?
    Prob an absolute noob question

  35. #35
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    Re: dump valve

    Quote Originally Posted by Misky View Post
    If i chop my samco boost hose and replace the d.v section with stainless/ally pipe wih no d.v outlet would that be ok, or would it ruin the turbo?
    Prob an absolute noob question
    No mate it wouldn't ruin it, it might decrease the life of the turbo slightly,
    You could just get a blanking plug for the DV hole instead of cutting the hose then you can put the DV back on

  36. #36
    Non-member TrixNFlix's Avatar
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    Re: dump valve

    Should be fine as the r5 came without a dump valve as standard.cue the dump valve debate!

  37. #37
    Non-member Mr 5's Avatar
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    Re: dump valve

    MISKY - No DV is fine in mine and alot of the members on here's opinions.

    i dont run one,and i run 18-20psi all the do-dah-day with no smoke or turbo issues

    i know lots on here use them tho,but about the same dont,also most D1 drift cars dont run one or a external waistgate and they run 20-30psi +

    personal opinion tho,not needed unless you like the sound,which i dont

  38. #38
    Non-member Misky's Avatar
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    Re: dump valve

    I thought that, but got told compressor surge bla bla by a mate on the plus side he was pushin my cracked piston liner from the underside and the coolant wasnt drained so as you can guess.... that shut him up!

  39. #39
    Non-member Mr 5's Avatar
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    Re: dump valve

    Quote Originally Posted by TrixNFlix View Post
    cue the dump valve debate!

    i was about to say that!

  40. #40
    Non-member TrixNFlix's Avatar
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    Re: dump valve


  41. #41
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    Re: dump valve

    Quote Originally Posted by TrixNFlix View Post
    cue the dump valve debate!
    wel............. no im joking i think compresser surge isnt good at any level of psi,

    yes i know 5's didnt come with them BUT did they know any better 20 years ago? i dounht it,now recirc valves are uses to prolong the life
    as we know comprsser surge puts undue stress on the blades of the compresser side

    tbh i do prefer the dv to a compresser surge,it dont sound as fun lol

  42. #42
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    Re: dump valve

    I much prefer the sound of compressor surge anyday, but its only by fitting an aftermarket airfilter that you hear it right? With a standard airbox doesnt the r5 'Surge' you just dont hear it?

  43. #43
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    Re: dump valve

    ive got a enclosed type airfilter (below)and i hardly hear it, but i dont like it, its not nearly as loud or pleasing as a dump valve

    but each to there own and i wont say it sounds horrible, just i dont like it!


  44. #44
    Non-member JRP's Avatar
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    Re: dump valve

    Dump valves are homosexual

  45. #45
    Non-member Tiny Tim's Avatar
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    Re: dump valve

    Quote Originally Posted by JRP View Post
    Dump valves are homosexual

    CORRECTION:

    Atmospheric Dump Valves are homosexual.

  46. #46
    Non-member JRP's Avatar
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    Re: dump valve

    Quote Originally Posted by Tiny Tim View Post
    CORRECTION:

    Atmospheric Dump Valves are homosexual.
    Stand errected doh i mean corrected

  47. #47
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    Re: dump valve

    so with out starting a fight here, whats the major problem with a dump valve tooshing,
    compresser surge sounds like someone having a fit
    plus surge causes the turbo to stall and the fact it dosnt do the turbo any good..

  48. #48
    Non-member Misky's Avatar
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    Re: dump valve


    Iv decided...
    Dump valves are only good if you want to impress young chavy boys .
    The female of the species are not impressed by cars that imitate bus's.
    Its really boring this thread now.

  49. #49
    Non-member JRP's Avatar
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    Re: dump valve


  50. #50
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    Re: dump valve

    only a sodding qestion

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