Torque Cars

Pug 306 1.9 tdi dump vavles??

Discussion in 'Peugeot forums' started by 2donskoy2, 18 May 2009.

  1. 2donskoy2

    2donskoy2 Wrench Pro

    Messages:
    33
    From:
    lincolnshire
    Car:
    ford festa mk5 1.7
    i have just bought my pug and i am looking for a dump valve kit for it, its a phase 1 306 1.9 xltd, could any1 suggest any for this, possibly any sites??
     
  2. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Diesel engines don't have any use for dump valves as there is no throttle. I wouldn't waste your money to be honest.
     
  3. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    Don't listen to Hdi. He's gettin on abit. ;)
    Have a look on ebay for a dump valve I'msure they'll be some on there. Other than that find a diesel tuning specialist and they should be able to supply you with one.
     
  4. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    But for what purpose? It won't have anything to dump!
     
  5. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    Dump valves work on diesels.
     
  6. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    By doing what? They might make a noise but it's fake and pointless. There's no benefit fitting a dump valve to an engine without a throttle.
     
  7. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    A dump valve releives pressure around the turbo so there is a point to having one.
     
  8. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    It relieves pressure when the throttle is closed during a gearchange.

    But a diesel engine does not have a throttle so there is no pressure to relieve. There's no throttle housing, no butterfly to shut off the airflow.
     
  9. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    So where does the Compressed air go then?
     
  10. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Into the engine through the intake manifold.
     
  11. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    No silly.:lol: I meant when you lift off the accelerator or change gear?
     
  12. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    It still goes straight in to the engine as there's no throttle to restrict the airflow. But there's very little boost as the fuelling has been cut completely (trailing pedal) or back to idle level if the clutch is down. You can't get boost without fuel as there's no mass of hot exhaust gas under pressure to drive the turbo. Effectively the turbocharger just freewheels.

    A dump valve is fitted to petrol turbo cars so that the slug of compressed air that's built up doesn't slam into the closed throttle butterfly(s) and bounce back causing sudden slowing of the turbocharger.

    With a diesel turbo engine it just goes into the cylinders as normal and comes out as normal. But without any (or very little) fuel being injected so the same volume of gas comes out, just that it's been compressed and then uncompressed again in the cylinders.

    There's nothing to bypass as such.

    There is still a wastegate but this is under ECU control to vent excess exhaust gas round the turbo. They just give a fluttering effect to the turbo hiss you hear when accelerating. It's especially noticeable between 2000 and 3000rpm where there's more potential boost available than the engine can actually utilise.
     
    Last edited: 18 May 2009
  13. 2donskoy2

    2donskoy2 Wrench Pro

    Messages:
    33
    From:
    lincolnshire
    Car:
    ford festa mk5 1.7
    oritre thanks people didnt mean to start an argument im stikll going to go ahead with it though thanks any way(y)
     
  14. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    Don't worry mate have a look round the forum and you'll soon see me an HDi are always at it. We good friends really but we do like a Good debate.
    Go for it buddy I would do the same.
     
  15. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Don't worry about that. As TN says we get on very well.

    The only thing you'll gain with a dump valve on your XUDT engine is some strange noises.

    It certainly won't help the performance.

    If you want to do something serious then start looking into altering the wastegate actuator.

    There's one around somewhere which went to over 130bhp with some changes to fuel boost compensation.
     
  16. 2donskoy2

    2donskoy2 Wrench Pro

    Messages:
    33
    From:
    lincolnshire
    Car:
    ford festa mk5 1.7
    orite okay thanks for the help guys (Y)
     
  17. jarrus

    jarrus Pro Tuner

    Messages:
    3,501
    From:
    West Midlands, UK
    Car:
    Suzuki Swift Sport
    Get one....I want one for mine....should help on/off thottle respponce....plus you get the noise...call me a chav if you want but i still think it's great

    Search "Derv Doctor" on the net, they are based in derby and they do a kit for our cars

    http://www.ottewilly.plus.com/pug306/technical/tuningtd/tuningtd.html

    thats a guide for tuning up you motor for more horses
     
  18. pgarner

    pgarner TC ModFather Moderator

    Messages:
    16,521
    From:
    Lockerbie, SW Scotland
    Car:
    Octy smoke machine
    shouldnt help with the on / off throttle response as theres not normally throttles on dervs
     
  19. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    DERV engines never have throttles.
     
  20. jarrus

    jarrus Pro Tuner

    Messages:
    3,501
    From:
    West Midlands, UK
    Car:
    Suzuki Swift Sport
    You're right in saying that diesels don't have throttles how ever you still need a device to get rid of the pressure when you're off the 'gas' because you don't need that amount of air when you're shoving less diesel in the cylinders.
    The XUDT comes with a recirculating valve on it which does the same job (almost) so why would Peugeot fit it if it didn't need it?
     
  21. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    The re-circulating valve is there to ventilate the crankcase of noxious gases. It's nothing to do with performance or regulating the turbo.
     
  22. davalav

    davalav Moderator

    Messages:
    3,617
    From:
    Essex, England
    Car:
    Mini Cooper S R56
    I heard you actually loose small amounts of power from fitting a dump valve, to a diesel as the boost from the re circulating gas is expelled meaning you loose boost. Correct me if I am wrong. I can't remember where I heard it but I do like the noise though....
     
    Last edited by a moderator: 9 July 2012
  23. pgarner

    pgarner TC ModFather Moderator

    Messages:
    16,521
    From:
    Lockerbie, SW Scotland
    Car:
    Octy smoke machine
    in theroy yes but as the dump valve should activate when you lift off the throttle then your not actually after power
     
  24. davalav

    davalav Moderator

    Messages:
    3,617
    From:
    Essex, England
    Car:
    Mini Cooper S R56
    Sorry for the mumbo jumbo... I replied on my phone. If I can find the article, then I'll post it. Where the DV has to be located means it expells the gas from the inlet, meaning you loose boost, it's almost like a boost leak... I wish I could explain things better, and actually remember what I am trying to say! Was that a reply to me, TN?
     
  25. pgarner

    pgarner TC ModFather Moderator

    Messages:
    16,521
    From:
    Lockerbie, SW Scotland
    Car:
    Octy smoke machine
    yeah it was in reply to you. a proper dump valve, ie on a petrol, is actuated when the throttle body closes this causes an area of higher pressure between the turbo and butterfly on the throttle body causing the spring to lift and the gas to go out.

    from what ive seen of diesel ones they are actuated by a switch rather than pressure to allow the air out. as most diesels dont have a conventional throttle body then this air would still be going into the engine but as you should be off throttle at the time then no diesel should be getting injected so no lose in power.
     
Loading...
Similar Threads - dump vavles
  1. rip
    Replies:
    10
    Views:
    5,261

Share This Page

Click Here
  1. This site, like pretty much every other site, uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are agreeing to our use of cookies, this may include third party cookies from our carefully selected advertising partners and for our analytics which allow us to see which pages are of interest and improve our site navigation and experience.
    You can disable cookies in your browser but this may affect your experience on this website.

    Dismiss Notice