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Type: Posts; User: phdv61

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  1. Replies
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    2,135

    I forgot to add above that, with this type of...

    I forgot to add above that, with this type of boost controller, you must make sure the lever applies firmly on the limiting screw and not be "just at the limit" ( and therefore more than with a dawes...
  2. Blocking EGR and adding a 3" exhaust is the...

    Blocking EGR and adding a 3" exhaust is the perfect recipee to get limp, in that it reduces back pressure (3" exhaust) and increase MAF voltage ( both EGR blocked and 3" exhaust do that).

    MAF...
  3. Replies
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    2,135

    I hardly ever come on this site these days, John....

    I hardly ever come on this site these days, John.

    For what I understand, this boost controller is equivalent to what I described elsewhere as a "two needles arrangement".
    One being connected to...
  4. Replies
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    1,152

    On a 2001 Di, boost level has nothing to do with...

    On a 2001 Di, boost level has nothing to do with limp.
    Limp only occurs when the MAF voltage
    - exceeds 3.55V below 2000RPM
    - exceeds 3.88V below 2500RPM
    - exceeds 3.98V below 3000RPM
    - exceeds...
  5. Replies
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    973

    Dawes + Needle is a disaster for the "breathing"...

    Dawes + Needle is a disaster for the "breathing" of your Patrol down low.
    The Dawes keeps the vanes of your VNT fully closed until you reach the opening boost it has been set to open at.
    And when...
  6. Replies
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    20,648

    Making the ECU believe there is less air coming...

    Making the ECU believe there is less air coming through by enlarging the inlet, or by simply adding one or two schottky diode in serie (costs only 10 cents each) with the MAF signal to reduce it by...
  7. Replies
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    804

    Unfortunately, what this device does is decrease...

    Unfortunately, what this device does is decrease the MAF voltage to make the ECM believe there is less air coming through.
    As a result, the ECM requests less fuel to the pump, and you get less power...
  8. Replies
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    20,648

    This is a non-sense mate. reducing the MAF...

    This is a non-sense mate.
    reducing the MAF voltage makes the ECM believe there is less air than real. So, the ECM requests less fuel to the pump.
    Pushing boost, when reducing the MAF voltage,...
  9. Replies
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    20,648

    Don't get me wrong. I am not saying you do not...

    Don't get me wrong.
    I am not saying you do not need to have more boost to get more air in.
    But boost is not all. What you need is to maximize the quantity of air getting in your cylinder, as...
  10. Replies
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    20,648

    Boost is not what is needed by your engine. Only...

    Boost is not what is needed by your engine.
    Only airflow matters ( MAF voltage represents an estimate of the quantity of air pushed by the turbo inside admission and your cylinders.

    It is a...
  11. Replies
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    804

    And the expected result speaks for itsel : plenty...

    And the expected result speaks for itsel : plenty of air, controlled boost, plenty of torque down low.
    Cherry on top of my cake: by reducing MAF voltage only when idling, fuel eco is improved by 30...
  12. Replies
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    804

    Reducing the MAF voltage suppresses limp, but...

    Reducing the MAF voltage suppresses limp, but also reduces power :

    The quantity of fuel requested by the ECM to the pump is directly linked to the MAF voltage value.
    The higher the MAF voltage,...
  13. Thread: Limp mode

    by phdv61
    Replies
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    1,262

    Hi mate, If you have fitted a dawes and Needle...

    Hi mate,
    If you have fitted a dawes and Needle Valve, and got read of the ECU control/ Solenoid, Limp mode can also be due to turbo pressure going a bit too high with the extra load/extra pressuve...
  14. How I improved the Dawes/Needle valve setup, adding a second Needle behind the Dawes

    Hi Guys,

    at last I can bring some interesting input to your fantastic forum, from which I learnt a lot.

    I wan not happy with the setting of a Dawes + Needle, in lieu of ECU + electrovanne on my...
  15. Replies
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    8,825

    No, I no longer use the Solenoid. I checked the...

    No, I no longer use the Solenoid.
    I checked the install post, and all was set as explained.

    With the original setting, I could get the pressure to go up nicely until 1.1 bar (16PSI), but I...
  16. Thread: Dawes Valve?

    by phdv61
    Replies
    6
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    1,889

    Error in my posted diagram. This is the correct...

    Error in my posted diagram.
    This is the correct arrangement :
    76229
  17. Replies
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    4,590

    Sorry. This is the correct arrangement. ...

    Sorry. This is the correct arrangement.

    7622876228
  18. Replies
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    8,825

    and there was a mistake in my diagram, sorry....

    and there was a mistake in my diagram, sorry.
    This is what I am about to do when I receive my second needle valve ( to smooth the flow coming from the dawes, and regulate the spped of opening of the...
  19. Replies
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    8,825

    Hi mate, thanks for your answer Originally, I...

    Hi mate, thanks for your answer
    Originally, I had this :
    76226
    With the needle set to establish the vacuum level as explained. But as soon as the Dawes was opening, I had a drop in pressure.
    And...
  20. Replies
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    8,825

    I was not happy with the Dawes/Needle setting,...

    I was not happy with the Dawes/Needle setting, although I got it to work.
    For me, this arrangement is missing one level of freedom to make sure we get the best out of the VNT.
    This is why I am...
  21. Replies
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    4,590

    not sure which thread to post to, but I was not...

    not sure which thread to post to, but I was not satisfied with the original install of the Dawes and needle, as I found the trade-off between spool-up and max boost to get a continuous and nice boost...
  22. Thread: Dawes Valve?

    by phdv61
    Replies
    6
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    1,889

    nobody ? I found a solution to get a progressive...

    nobody ?
    I found a solution to get a progressive opening of the variable geometry by improving Chaz's schematic as follows :
    Any comment welcome.

    76219
  23. Replies
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    8,825

    I replaced my 2000 IC recently from stock, by a...

    I replaced my 2000 IC recently from stock, by a larger one, but I can ensure you I had absolutely no problem with it, and it was not leaking ( no oily/greasy ends). So I guess it sometimes happened...
  24. Replies
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    hi mate, Philippe from the other side of the...

    hi mate,
    Philippe from the other side of the planet (FRANCE).

    When you play with the needle, from closed to opened, do you see the actuator arm moving from one end to the other ?

    if you take...
  25. Thread: Dawes Valve?

    by phdv61
    Replies
    6
    Views
    1,889

    Hi down under, I am a french owner of a...

    Hi down under,

    I am a french owner of a 05/2000 3.0Di Y61 PATROL (ZD30), with 160 000km, which I bought brand new... 18 years ago.
    I did nothing on it until reaching 150 000km. No problem...
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