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Thread: 3.9 Plenum Heating Needed?

  1. 20th December 2008, 10:15 AM #1
    Traco
    Traco is offline Master Supporter
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    3.9 Plenum Heating Needed?

    Any advantage in removing the plenum heater pipes on a 3.9?

    They appear to be for heating the inlet air, ok for the UK but not really needed for Oz. In fact I was always under the impression that the colder the inlet charge was the better for torque.

    Is it just a matter of disconnecting the pipes and blocking them off? Any likely adverse effects on the injection system?
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  2. 20th December 2008, 10:23 AM #2
    Sprint
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    cant speak with any authority on the 3.9's, but i know with the windsors in falcons, they use the coolant to keep the EGR section of the intake manifold cool.....
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  3. 20th December 2008, 10:38 AM #3
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    Blknight.aus
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    only really of use when its cold...

    I wouldnt worry about them in queensland/nt/sa but Id leave them in place in nsw/vic WA would be dependant of where you were but perth Id leave them.
    Dave

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  4. 20th December 2008, 10:44 AM #4
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    wayneg
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    This right up might shed some light

    Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting
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  5. 21st December 2008, 04:35 PM #5
    PhilipA
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    I pointed out to this guy a long time ago that he was wrong on both the voltage feed to the O2 sensors (it is 12volts from the fuel relay not 5 volts from the ECU) and that the Titania sensors do not read in the opposite direction to Zirconia sensors, they also go from 1volt (rich) to 0 volt lean.
    He chose to ignore me, however the rest of the article is good AFAIK.
    regards Philip A
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  6. 22nd December 2008, 09:32 PM #6
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    LOVEMYRANGIE
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    I have had mine bypassed for some time now and I havent noticed any difference. As a heater in Oz weather it probably doesnt make a whole difference, but winter in JCville may be another thing.
    All the temp sensing is done in the MAF for air temp into the engine.
    My reasoning for disconnecting was one it was leaking and two it could result in a slightly colder charge.
    I know I fixed one problem...!
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  7. 22nd December 2008, 10:14 PM #7
    mike 90 RR Guest
    Quote Originally Posted by wayneg View Post
    This right up might shed some light

    Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting
    Quote Originally Posted by PhilipA View Post
    I pointed out to this guy a long time ago that he was wrong on both the voltage feed to the O2 sensors (it is 12volts from the fuel relay not 5 volts from the ECU) and that the Titania sensors do not read in the opposite direction to Zirconia sensors, they also go from 1volt (rich) to 0 volt lean.
    He chose to ignore me, however the rest of the article is good AFAIK.
    regards Philip A
    That article is brilliant Thanks for that
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