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Thread: TD5 waste gate actuator operation

  1. #41
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    BTW isnt there any default strategy in the ECU for WGM open circuit failure as to affect fuelling or something? if it fails in reality with open circuit no fault code is stored for that?
    Discovery Td5 (2000), manual, tuned

  2. #42
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    Quote Originally Posted by sierrafery View Post
    BTW isnt there any default strategy in the ECU for WGM open circuit failure as to affect fuelling or something? if it fails in reality with open circuit no fault code is stored for that?
    The only way WGM effects fuelling is through boost.
    You'll probably get a fault code but it's not going to effect the engine any more than bypassing the WGM while leaving the harness connected.

  3. #43
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    Reviving an old but relevant thread.
    I recently drove from Brisbane to Sydney with the WGM disconnected due to a pipe blowing off. I was getting boost up to 24PSI on my gauge which agreed with the Nanocom. What I noticed is that I had vastly lower EGTs. car is 2002 EU3 auto with BAS map, no EGR, performance intercooler, free flow exhaust

    I had previously bought a manual boost controller which consists of a ball valve tensioned by a spring which is adjustable.

    So I directly connected the Manual valve to the inlet pipe to the intercooler( where the stock hose comes from) ,directly to the wastegate diaphragm.

    I tested the manual valve by climbing a big hill near my place, but continued to get about 24PSI . Today I tested further and with constant light throttle I am getting 24PSI , but if I floor it I am getting 27-28PSI.

    Offtrack kindly altered the parameters of my MAF and boost sensor in my ECU map, so I have no cutout at these boost pressures.

    I tested the wastegate with a foot pump and it opened at about 1.5bar. I will lube it when I get a chance, and the manual controller also seemed to open at about 1.5 bar. It is almost at the end of its thread at the low boost end.

    I love the power with low EGTs with using the manual wastegate but am a bit worried about extreme PSIs ,particularly when towing my camper trailer. I would seem a pity to go back to the WGM and high EGTs when the extra boost seems to cut at least 100C from the EGTs and the car is flying..
    Any suggestions?
    Maybe I should try another type of boost control like a Dawes valve as the one I have is an inline type with an inlet ball valve spring then outlet all inline.
    Regards Philip A

  4. #44
    discorevy is offline ChatterBox Silver Subscriber
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    if it is a cheap ebay mbc , chuck it away, and get a decent one (turbosmart or turbotech seem pretty good ), almost every cheap one that some of the younger jap ute drivers bring in for me to "have a look at" have rusted ball bearings and or springs .
    can't remember if you have upgraded the turbo on yours , but even if you have , I wouldn't go above 24-25 psi as any more will become wasted energy / heat .
    your egt will still be lower with 24 psi with plenty grunt

  5. #45
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    I have given this a lot of thought overnight.
    There are 2 issues IMHO.
    1 is the poor quality of the manual controller.

    The other is that I have not wound back the rod on the wastegate.

    It is obvious to me ,seeing the great difference in the boost with wastegate closed and when controlled by the WGM , that the WGM is opening at 15PSI as standard, and that the wound up rod is preventing the wastegate from opening enough too bleed enough boost which raises the boost to 20PSI or so.

    In other words the wastegate is basically controlling itself, and the WGM is causing boost to bleed at over 15PSI.

    It would be good if someone like Offtrack could reprogram the ECU to open the WGM at 20PSI or so.LOL.

    At present both the wastegate and manual controller are opening at about 22PSI but I am getting a lot of overshoot.
    I don't have time at present to experiment further so I will revert to the WGM until I get a better manual controller and have time to wind back the wastegate.
    Regards Philip A

  6. #46
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    Quote Originally Posted by PhilipA View Post
    I have given this a lot of thought overnight.
    There are 2 issues IMHO.
    1 is the poor quality of the manual controller.

    The other is that I have not wound back the rod on the wastegate.

    It is obvious to me ,seeing the great difference in the boost with wastegate closed and when controlled by the WGM , that the WGM is opening at 15PSI as standard, and that the wound up rod is preventing the wastegate from opening enough too bleed enough boost which raises the boost to 20PSI or so.

    In other words the wastegate is basically controlling itself, and the WGM is causing boost to bleed at over 15PSI.

    It would be good if someone like Offtrack could reprogram the ECU to open the WGM at 20PSI or so.LOL.

    At present both the wastegate and manual controller are opening at about 22PSI but I am getting a lot of overshoot.
    I don't have time at present to experiment further so I will revert to the WGM until I get a better manual controller and have time to wind back the wastegate.
    Regards Philip A
    I would agree,
    I'd suggest that there is too much "pre load" on the waste gate rod, when used with a mbc, if you set the mbc to say...1.4 bar, it starts to let boost through to the Wastegate actuator, but the rod is too long/short(I can't remember which) and it never actually moves the Wastegate itself, as you run out of pressure before it can overcome the "manual" settings.

    Another thing to check would of course be the wgm itself,
    it's quite possible that this is leaking which then won't allow you to see exactly what the ecu is trying to get it to do when you have that hooked up instead.

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