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Thread: Boost sensor

  1. 13th May 2010, 03:05 PM #11
    LOVEMYRANGIE's Avatar
    LOVEMYRANGIE
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    Boost sensor

    Rudolph, there is not set length on it. There should be a number handwritten onto the w/gate actuator which is the set pressure in bar. You really need a boost gauge or nanocom to see where it actually is. Do a search on it. Basically, shortening the rod increases pressure and lengthening it reduces pressure but do it with a gauge monitoring what actual line pressure is. You really are better off using a nanocom to do it and road adjusting it under load, not parked up.

    Graham, if you have an old one, can you cut it open, wouldn't mind looking at one internally. As it's a 3 port, it should be a switching unit not modulating.
    Seems strange that it would allow the wastegate to be constantly pressurized then blocking under special conditions as opposed to switching when boost gets a high signal then getting a faster action on the wastegate. Your description makes it NC rather than NO.
    might have a play with mine over the weekend. The top port on mine is glued on as it snapped off while away a few months back and I haven't got around to replacing it.
    Cheers

    Andrew



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  2. 13th May 2010, 07:01 PM #12
    Graeme
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    It is driven by a pwm signal (pulse width modulated) of varying pulse width to hold the valve partially open by varing degrees in order to prevent the wastegate from opening or opening so far, or totally closed by default which then relies upon the wastegate opening pressure to have been correctly set. A maximum base (default) boost is achieved by passing the turbo output directly to the wastegate actuator but under ecm control, greater boost is allowed by introducing some low pressure (suction) from the turbo inlet side that reduces the pressure to the actuator and thus prevents the wastegate from opening or opening so far. Having the ecm control extra boost is far safer and much more reliable than having the ecm try to cut boost. The ecm will cut fuel if excessive boost is detected.

    The modulator's mechanicals are not affected by pressure, rather its gunk (oil+carbon etc) that jams the valve or electrical failure that causes the modulator to become faulty. Just get a new modulator!
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  3. 13th May 2010, 07:17 PM #13
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    LOVEMYRANGIE
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    Makes sense now! Might pick up a new one tomorrow as I have a sneaking suspicion mines a bit dodgy.
    Answered my question!!


    Cheers

    Andrew
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  4. 14th May 2010, 03:17 AM #14
    Rudolf
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    Me too have that sneaky suspicion obout mine.
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  5. 14th May 2010, 04:33 PM #15
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    Boost sensor

    Ok, just bought a newie, had to anyway as top fitting was snapped off and hose was just glued on, but out of the packet, the turbo outlet port ( metal barb on the bottom) was blocked and passage was between top two ports.

    The one removed had a passage between the bottom and side port.

    I did find a modus operandii on Rave last night, so will extract it next time I get a chance and compare descriptions.

    Cheers

    Andrew

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  6. 14th May 2010, 08:36 PM #16
    Graeme
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    Hmm, it sounds as though the default is to allow unlimited boost until the ecm operates the modulator. I sold my D2 yesterday so can't go and check, but one would expect a new modulator to operate correctly.

    Be aware that Rave on page 18-1-33 states that vacuum is used to operate the wastegate and on the next page is correctly states that pressure is used to operate the wastegate. The description is too brief and leaves out some of the explanation which can be misleading.
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  7. 19th May 2010, 01:41 PM #17
    Rudolf
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    Boost Modulator

    I understand that the Defender TD5 engines does not have a modulator.
    Why is this so and what's the difference between the D2 and Defender?
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  8. 19th May 2010, 07:09 PM #18
    Graeme
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    Defender TD5s develop 90 kw whereas the D2's develop 101.5 kw in stock form.
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