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Thread: Td5 Hi-Lo and Maps

  1. #11
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    Apr 2019
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    Quote Originally Posted by pjh4159 View Post
    I recently replaced the pressure can in my 2002 Defender TD5 fuel pressure regulator as the original was leaking from this item and I did not see the need for replacement of the fuel regulator complete. I had previously fitted a pressure gauge to keep an eye on fuel pressure and prior to my replacement of this part it was consistently reading around 60psi at all revs. After I replaced this can purchased for around $40 on ebay for a quality German made replacement part the new pressure is now consistently 90psi at all revs and now the engine pulls like a train in comparison to the old original. I am surprised the electric fuel pump can achieve this pressure but I have been running this setup for around twelve months now while towing a 3.2 ton off-road caravan. Try replacing this part on your TD5 fuel regulator and I am sure will get the engine performance designed by the factory. I will try and find the part number of the part I replaced so others can do the same.
    90psi seems a bit extreme...

    I thought they ran at about 65psi or between 4 - 4.5 Bar.

    Mine was replaced with Bosch Part No. 0 280 160 575.
    It has 400Kpa (4 Bar) printed on the Pressure Regulator housing.

    Runs a Stage 2 tune just fine....

  2. #12
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    Apr 2012
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    Whyalla, SA
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    Quote Originally Posted by mylesaway View Post
    90psi seems a bit extreme...

    I thought they ran at about 65psi or between 4 - 4.5 Bar.

    Mine was replaced with Bosch Part No. 0 280 160 575.
    It has 400Kpa (4 Bar) printed on the Pressure Regulator housing.

    Runs a Stage 2 tune just fine....
    Agree - working that system an extra 2 bar isnt going to make any friends with it, there will be a life reduction.
    Sounds like someone just threw any regulator in the parcel and this is what he ended up with.

  3. #13
    Join Date
    Oct 2020
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    Elizabeth North SA
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    Quote Originally Posted by mylesaway View Post
    90psi seems a bit extreme...

    I thought they ran at about 65psi or between 4 - 4.5 Bar.

    Mine was replaced with Bosch Part No. 0 280 160 575.
    It has 400Kpa (4 Bar) printed on the Pressure Regulator housing.

    Runs a Stage 2 tune just fine....
    4 bar 58 psi, mine leaked past the regulator body O-ring at 80 psi even with a thicker cross section replacement.

    Still running with the BA falcon regulator atm. Have got everything to mount regulator on firewall but leaving well enough alone (all good with no fuel cooler too)

  4. #14
    Join Date
    Mar 2018
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    New Zealand
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    Hi everyone,

    Thanks for all of your replies several weeks ago. Apologies for my delayed response – I'm just dealing with a rather long lockdown in NZ (and lack of employment).

    PhilipA, your idea of handbrake shoes against the backing plate makes sense so definitely something I'll look into first. The rev range the vibration is noticeable at is between 1750 and 2250, with 2100 probably being the worst. When idling in drive the vibrations are there but when in neutral they are not.
    I'll look at engine mounts too.

    My theory of the hi-lo maps being mixed up was just an idea because the ECU reads that it is in lo when it is in both hi and lo – could this be a possibility? The gear changes and fuelling just don't seem right unless it's in lockup. Is there a way I can make sure that the ECU will only use the hi range fuel map? ie. is there a wire I can pull from the ECU plug (or anywhere) to disable a lo range map? Purely for a diagnosis.

    Cheers,
    smOke.

  5. #15
    Join Date
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    FNQ
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    Quote Originally Posted by smOke View Post
    Hi everyone,

    Thanks for all of your replies several weeks ago. Apologies for my delayed response – I'm just dealing with a rather long lockdown in NZ (and lack of employment).

    PhilipA, your idea of handbrake shoes against the backing plate makes sense so definitely something I'll look into first. The rev range the vibration is noticeable at is between 1750 and 2250, with 2100 probably being the worst. When idling in drive the vibrations are there but when in neutral they are not.
    I'll look at engine mounts too.

    My theory of the hi-lo maps being mixed up was just an idea because the ECU reads that it is in lo when it is in both hi and lo – could this be a possibility? The gear changes and fuelling just don't seem right unless it's in lockup. Is there a way I can make sure that the ECU will only use the hi range fuel map? ie. is there a wire I can pull from the ECU plug (or anywhere) to disable a lo range map? Purely for a diagnosis.

    Cheers,
    smOke.
    Check the throttle range with the nanocom.
    Pretty sure H=0 to 100% and Low is 0 to 75% ( I think, )

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