Announcement

Collapse
No announcement yet.

Dump Valve Help !!!!

Collapse
This topic is closed.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Dump Valve Help !!!!

    Any one got or can take a pic for me of where and how the vacum pipe of the top of the dump valve fits onto the engine i no courtney say not to put it were u would think that it has to go somewhere else but there closed till monday so if anyone can help id be much appriciated...

    PS please dont turn this thread into weather or not i should have a dump valve as that has already been covered in another thread just need the assistance is someone can help

    Cheers

  • #2
    This is the information I have previously posted, I hope it helps.

    Our hose with the dump valve spigot is £57.95 and the D Valve with a minor fitting kit £85.00. http://www.courtenaysport.co.uk/default.htm?page=118
    As regards suitability for VXR and losing power... the only way a dump valve will make an engine lose power is if the dump valve leaks, for this to happen there are 2 causes. The first is that the valve is faulty the second and by far the most common cause is that it has been fitted incorretly. This problem goes right back to the early days of the ZLET engine in the Astra Coupe however it still applies to Z20LEL, Z20LER and of coarse Z20LEH (VXR)
    80% of cars we see in the workshop have the dump valve fitted incorrectly, even by tuners. This is down to the trigger pipe source.... unfortunatly the easiest place to pick up this source is in fact the wrong point hence the extent of the problem.
    I have cut and pasted in the relevant details from our web site giving a full explanation...
    Dump Valve Fitting Recommendations
    This is a guide for fitting a dump valve and eliminating dump valve related drivability issues on Astra G and H, Zafira A and B and VX220 fitted with the Z20LET - LEL – LER - LEH engines.
    The dump valve for these engines must be a twin piston unit as the car has air mass metering. The twin piston unit stops the valve breathing un-metered air on vacuum, confusing the engine ECU.
    How a Dump Valve Works
    Traditionally a dump is fitted in the boost pipe close the inlet manifold; it has a vacuum - boost trigger pipe taken from the inlet manifold between the throttle body and the engine. When driving the car hard on boost there is boost pressure pushing on the dump valve, however there is equal boost pressure pushing on the dump valve diaphragm on the other side. This holds the dump valve shut in equilibrium. When you lift off the throttle the throttle body closes this creates a vacuum in the manifold thus in the boost – trigger pipe, this vacuum pulls on the dump valve diaphragm and with the boost pressure in the inlet pipe pushes the valve open releasing the air into the engine bay with a whoosh.
    How is this Vauxhall Engine Different ?
    These engines work as above, with one major difference. The boost - vacuum trigger pipe is run through a vacuum storage capsule, and a solenoid that is triggered by the engine ECU. There are switches on the pedals so the ECU knows when you de-clutch and trips the solenoid to create the vacuum quicker to the original equipment recirculation dump valve built into the side of the turbo.
    This vacuum solenoid arrangement is also used on part throttle to regulate the air mass to the engine, i.e. when the turbo is trying to make boost due to its small size but the load demands and throttle angle do not require boost, it opens and shuts the factory re-circ valve to regulate boost improving drivability, kind of like a secondary throttle.
    This is the source of the trouble. If you use this trigger source (i.e. from the original vacuum storage) for the aftermarket dump valve it will pulse the new valve on part throttle, the previously metered air is then released into the engine bay and will cause driveability issues on the fuelling. In some circumstances the car will also go lean, in this situation the TC (traction control) light can come on.
    The Fix
    The cure is to give the aftermarket dump valve its signal from a true non interrupted vacuum source; we recommend the fuel pressure regulator. For further improved driveability, it is possible to leave the original equipment valve still working so the engine management can regulate, control and pulse this valve. However the aftermarket valve will operate slightly quieter.

    Jon
    sigpic
    29 Years as Vauxhall Tuners

    Comment


    • #3
      I already read that on courtneys site im after a picture if pos of it set up with the fuel regulator to make sure i have it right... The guys at courtneys were gonna help me over the phone but they aint working weekends (alright for some ha)

      Comment


      • #4
        Originally posted by vxr ned
        I already read that on courtneys site im after a picture if pos of it set up with the fuel regulator to make sure i have it right... The guys at courtneys were gonna help me over the phone but they aint working weekends (alright for some ha)
        A11VXL is Courtenays. infact that'll be Jon him self.

        you need to T in to the fuel pressure regulator pipe for the feed to the DV.

        Comment


        • #5
          Originally posted by alex_c
          Originally posted by vxr ned
          I already read that on courtneys site im after a picture if pos of it set up with the fuel regulator to make sure i have it right... The guys at courtneys were gonna help me over the phone but they aint working weekends (alright for some ha)
          A11VXL is Courtenays. infact that'll be Jon him self.

          you need to T in to the fuel pressure regulator pipe for the feed to the DV.
          where is the fuel regulator on the vxr ?????????

          Comment


          • #6
            Ok ive got mine in its isnt as load as I expected but i think that is good as i didnt want it to loud.....

            Right here we go

            Imagine your stood in front of the car looking into the engine bay( only way to be really) look at the left hand side of the back of the engine at the end of the fuel rail underneath the black hir hose the is connected from the engine to the mass meter is the regulator

            You will recognise it as there is a metel pipe that comes out the top and turns 90 degrees to face the drivers wing.....

            Now onto the pipe there is a rubber 90 degree turn....

            Pull the rubber 90 degree bend pipe of the regulator...

            Cut a piece of your thin hose supplyed in the dump valve fitting kit about 3 inch long ( too long and the 90bend will flap about and 2 short and you might kink it when you put it all together........

            Then onto this put the plastic T piece on the straight through section of the T piece slip the rubber 90 degree bend onto it and on the 3 section of the T piece slip the vacum hose for the DV....

            Doing it this way means u aint cut anything of the engine so it will all go back if u aint happy with the results...

            Now fit the DV in the required place I run the vacum along the bulk head with the other wires so u cant really c it and it looks very neat and tidy to give the following result....



            Hope this helps

            Comment

            Working...
            X