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06-02-2008
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#1 (Post Link)
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Newbie
Join Date: Feb 2008
Location: carrickfergus/n.ireland
Posts: 24
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dump valve on a 2.4jtd
was wandering what yas thought a dump valve would sound like on a 156 2.4jtd. ive purchasd a universal dump valve to fit onto my jtd,only mycar is in the garage at present getting sump fixed so havent had a chance yet  |
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06-02-2008
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#2 (Post Link)
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Super Moderator
Join Date: May 2007
Location: On cam
Posts: 10,313
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Re: dump valve on a 2.4jtd
You really don't want to ask this question. It will sound like a dump valve. Tssshh.....werrrrr tsssch..... Very silly noise and has no benefit to your JTD
You are not driving an Impreza STI....
Incommmiiiing!!  |
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06-02-2008
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#3 (Post Link)
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Newbie
Join Date: Feb 2008
Location: carrickfergus/n.ireland
Posts: 24
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Re: dump valve on a 2.4jtd
true its just for a laugh tho.
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06-02-2008
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#4 (Post Link)
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Super Moderator
Join Date: May 2007
Location: On cam
Posts: 10,313
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Re: dump valve on a 2.4jtd
For a laugh? oookay |
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06-02-2008
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#5 (Post Link)
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AO Platinum Member
Join Date: Apr 2006
Location: North Yorkshire
Posts: 12,866
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Re: dump valve on a 2.4jtd
Dump valve won't work on a JTD, cause there is no throttle to close. On a turbo petrol, coming off the accelerator closes the throttle butterfly, allowing a build up of pressure outside the inlet manifold for the valve to then 'dump' in a big hiss.
On a JTD (or any TDi) there is no throttle butterfly, so any boost the turbo creates when you come off the acclerator just goes straight through the engine, only no fuel is injected.
I think this might have been one of the first things I asked when I bought my JTD 
Back on the road: Alfa 156 3.0 24v V6, Silver with red leather, Q2 diff, GTA Teledials, headlights & inlet manifold, AutoDelta carbon intake,
decat pipe and SuperSprint rear box, Dastek Unichip, FK coilovers - my 245bhp beast!
Gone but not forgotten: Alfa 156 2.4 JTD Veloce, Vela Blu, Angel 'mad map' & BMC CDA, Ferodo DS2500s - the fastest tractor in town!
AO 'Bratpacker' No 5. 
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06-02-2008
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#6 (Post Link)
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Club Member
Club Member Number: 352
Join Date: Jul 2007
Location: Dunmurry,Northern Ireland
Posts: 859
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Re: dump valve on a 2.4jtd
Originally Posted by Pud237
Dump valve won't work on a JTD, cause there is no throttle to close. On a turbo petrol, coming off the accelerator closes the throttle butterfly, allowing a build up of pressure outside the inlet manifold for the valve to then 'dump' in a big hiss.
On a JTD (or any TDi) there is no throttle butterfly, so any boost the turbo creates when you come off the acclerator just goes straight through the engine, only no fuel is injected.
I think this might have been one of the first things I asked when I bought my JTD
Spoil sport!!!!  |
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06-02-2008
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#7 (Post Link)
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AO Member
Join Date: Sep 2007
Location: Blackpool
Posts: 75
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Re: dump valve on a 2.4jtd
i did a little looking into this just before i bought my alfa and you CAN fit a bov to a diesel but not just your ordinary one it needs to be one of these!
Forge Motorsport |
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06-02-2008
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#8 (Post Link)
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AO Member
Join Date: Sep 2007
Location: Blackpool
Posts: 75
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Re: dump valve on a 2.4jtd
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06-02-2008
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#9 (Post Link)
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Club Member
Club Member Number: 270
Join Date: Oct 2006
Location: Dumfries, Scotland
Posts: 10,308
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Re: dump valve on a 2.4jtd
Dump Valve? Do you really want to sound like an old Corporation bus? |
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06-02-2008
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#10 (Post Link)
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AO Member
Join Date: Sep 2007
Location: Derbyshire
Posts: 741
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Re: dump valve on a 2.4jtd
Originally Posted by Pud237
Dump valve won't work on a JTD, cause there is no throttle to close. On a turbo petrol, coming off the accelerator closes the throttle butterfly, allowing a build up of pressure outside the inlet manifold for the valve to then 'dump' in a big hiss.
On a JTD (or any TDi) there is no throttle butterfly, so any boost the turbo creates when you come off the acclerator just goes straight through the engine, only no fuel is injected.
I think this might have been one of the first things I asked when I bought my JTD
the 140 has a butterfly which closes via the vacuum box thingy at the back of the engine, it is used in conjunction with the EGR system.
Capping off the EGR and leaving the vacuum connected to the butterfly may cause a build up of pressure one side, but engine side it will try sucking from somewhere - perhaps oil through the valve stem oil seels? (not good)
I thought these dump valves came free with chav baseball caps, exhaust tail pipes the size of paint tins, blue LED's you stick on your washer jets or fake leather(ette) seat covers. |
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06-02-2008
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#11 (Post Link)
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AO Platinum Member
Join Date: Apr 2006
Location: North Yorkshire
Posts: 12,866
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Re: dump valve on a 2.4jtd
Jason - to summarise then, a Bad Idea  |
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06-02-2008
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#12 (Post Link)
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Club Member
Club Member Number: 270
Join Date: Oct 2006
Location: Dumfries, Scotland
Posts: 10,308
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Re: dump valve on a 2.4jtd
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06-02-2008
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#13 (Post Link)
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Newbie
Join Date: Feb 2008
Location: carrickfergus/n.ireland
Posts: 24
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Re: dump valve on a 2.4jtd
bad idea no probs thanks for the advice, the problem being im turning into an ebay addict and running outta things to buy i like the sound of them but wouldnt go buyin a suburu just to hear one.. |
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11-02-2008
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#14 (Post Link)
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Club Member
Club Member Number: 352
Join Date: Jul 2007
Location: Dunmurry,Northern Ireland
Posts: 859
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Re: dump valve on a 2.4jtd
I wouldn't buy a subaru if the choice was either a subaru or getting a bus!! Cheap interiors, badly finished cars and the modern day equivilant of a nova sr (albeit a hell of a lot faster), i.e. everyone has one.....
Just my opinion but Scoobys don't do it for me in anyway at all!
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11-02-2008
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#15 (Post Link)
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Club Member
Join Date: Aug 2006
Location: The AO Underground !!!
Posts: 40,017
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Re: dump valve on a 2.4jtd
I'm glad you were only joking Wes 
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11-02-2008
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#16 (Post Link)
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Club Member
Club Member Number: 162
Join Date: Sep 2005
Location: Beds
Posts: 6,292
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Re: dump valve on a 2.4jtd
I say fit one - you will notice a huge improvement....
Chris |
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11-02-2008
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#17 (Post Link)
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Club Member
Join Date: Aug 2006
Location: The AO Underground !!!
Posts: 40,017
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Re: dump valve on a 2.4jtd
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11-02-2008
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#18 (Post Link)
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Club Member
Club Member Number: 162
Join Date: Sep 2005
Location: Beds
Posts: 6,292
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Re: dump valve on a 2.4jtd
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11-02-2008
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#19 (Post Link)
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Club Member
Join Date: Aug 2006
Location: The AO Underground !!!
Posts: 40,017
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Re: dump valve on a 2.4jtd
Oh shut up Margery |
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11-02-2008
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#20 (Post Link)
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Join Date: Feb 2006
Location: Ireland, Cork.
Posts: 3,307
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Re: dump valve on a 2.4jtd
Originally Posted by noz40
You will allegadly loose power if you run one of them. Not sure why bit pointless you can hear the wastegate going off from a diesel engine and the woooooosssshh of the turbo spooling would be enough for me |
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12-02-2008
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#21 (Post Link)
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AO Member
Join Date: Sep 2007
Location: Blackpool
Posts: 75
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Re: dump valve on a 2.4jtd
Originally Posted by Damien_C
You will allegadly loose power if you run one of them. Not sure why bit pointless you can hear the wastegate going off from a diesel engine and the woooooosssshh of the turbo spooling would be enough for me
I agree. i prefer that too but each to there own i suppose! |
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