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Thread: diesel dump valve kits for your veccy!!!

  1. #1
    Regular Member dervdoc's Avatar
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    Default diesel dump valve kits for your veccy!!!

    hi guys and gals have made dumpvalve kits up and fitted them to diesels before, so many people have asked me about them for vectra's i thought sure why not, so just to let ya's know i shall be designing them for diesel veccys and siggy's,
    it'll take a few weeks getting parts and stuff gathered up and fabricating mounting brackets to suit etc...
    o and dont worry about a price tag it'll be a lot cheaper than any of your performance shops,
    so as soon as i get the production line going you guys will have first refusal

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    Regular Member lee_eardley's Avatar
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    whats the advantage of having a dump valve on a diesel? as the turbo does not spin up until 2500 rpm.ebrn if you let the revs go around until 4000 when you change gear you are normally over the magic 2500rpm...

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    Regular Member dervdoc's Avatar
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    Quote Originally Posted by lee_eardley View Post
    whats the advantage of having a dump valve on a diesel? as the turbo does not spin up until 2500 rpm.ebrn if you let the revs go around until 4000 when you change gear you are normally over the magic 2500rpm...
    ehhh.. duh... well anyone who knows there derv knows that m8 ! i never said there was any advantage ,its for anyone who likes the sound of it, thats all it is!SOUND!!!!!!!

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    Regular Member lee_eardley's Avatar
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    just had a look at you rweb site and they look and sound really good

  5. #5
    Regular Member dervdoc's Avatar
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    Quote Originally Posted by lee_eardley View Post
    just had a look at you rweb site and they look and sound really good

    sorry m8 ya av got the wrong dervdoc, i am the origional i worked alot at dervs from i was about 10 r 11, loved working at them etc.. so m8 called me dervdoc and thats what i use for my username on every thing, next thing i know the guys at the website set up there business using the same name and everyone thinks its me cause iv fitted dumpvalves to diesels before
    Last edited by dervdoc; 23rd April 2007 at 23:29.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    The turbo does spin below 2500 rpm, else how would the torque curve have the shape it does? Anyone who knows anything about turbo chargers knows that.

    The real reason for fitting a dump valve is to keep the turbo spinning when changing gears, and hence have better boost when the throttle comes back on.

    If you don't understand that, then you know nothing about dump valves and the REAL reason for fitting them. It is NOT about sound, it is about energy dissipation and thus keeping the turbo spinning.

    The dump valve operates when you come off throttle, thus releasing pressurised charge air, thus reducing restriction loads on the already spinning turbo (as it not compressing air now) hence it continues to spin faster for longer so when the throttle comes on again, the valve closes, and the faster spinning turbo can do some more work compressing air into the power cylinder. Thus you get more power immediately and don't have to wait for the turbo to spin up again. (even if it is quite responsive, depending on revs)

    I am not entirely sure what the benefit of fitting one on Vec diesels would give you though, probably not that much increase in responsiveness.

    If you only fit a dump valve for the hiss, then I think you are missing the point, and could simply fit a different device (like a brain). No offence to anyone intended, but I don't see the point just for noise.

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    Ex Vec-C Admin / Founder Duncan's Avatar
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    I thought all/most of that only applied to dump valves on petrols? I thought DVs on diesels had no real benefit, other than the noise? (if you can call that a benefit).

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Engine : 3.0D V6

    Year : 0000

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    The phsyics are basically the same in principle, but as I say, i am not sure what the actual benefit would be.

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    Regular Member Ian's Avatar
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    To fit a DV to a diesel requires a microswitch to be fitted to the throttle to activate the DV via a soleniod. This is because, unlike a petrol turbo, the desiels throttle controls the fuel pump NOT the air inlet butterfly. There is no restriction when off the throttle for a desiel and that is why there is no performance benefit to fitting a DV to a desiel. Yes the turbo spins below 2500rpm, but due to the high compression required in a desiel chamber, has no benefit (the actual rpm depends on the car - mine on my 1.9 kicks in at about 1700rpm and reaches max boost at 2100rpm where the actuator limits the boost).

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    Ex Vec-C Admin / Founder Duncan's Avatar
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    I knew there was a reason that DVs on diesels had no use, just couldn't remember the specifics other than it was due to the petrols having the butterfly. Cheers Ian.

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