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Disco 2 Wastegate strange behaviour

Discussion in 'Land Rover Discovery' started by Michalis Karatzis, Mar 14, 2019.

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  1. Michalis Karatzis

    Michalis Karatzis Member

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    So I decided to try a few things since my boost pressure was not high enough (up to 220kpa on nanocom).
    Note the modulator is new and connected and the wastegate moves freely (it just swings with no resistance in both directions)

    The actuator was already shortened when I bought the car and I never touched it. You can see in the first foto how short.

    First try was with the actuator a bit longer (maybe 5-6 threads longer) Max pressure was around 205-10kpa with this setup.

    Second try was with the actuator disconnected and the wastegate kept closed with the help of a cable. With this setup I was expecting some overboost but no...max pressure was 150kpa for some reason. Strange!

    Then I shortened the actuator as much as I could (see foto) and the max pressure was 225-30kpa. This is very short and I have to stretch the actuator a centimetre in order to attach it to the wastegate.

    What might be the issue? I can't think what is going on and the wastegate behaves like this.

    20190314_150350.jpg 20190314_164448.jpg
     
  2. sierrafery

    sierrafery Well-Known Member

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    Record an inputs fuelling log and post it here
     
  3. Michalis Karatzis

    Michalis Karatzis Member

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    This might be a bit hard because I have the old steel nanocom and I am not sure how I can record a log
     
  4. sierrafery

    sierrafery Well-Known Member

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    Read the ambient pressure and see how it behaves under load... i mean does it drop much? what year is your D2, 10p or 15p engine?, is the EGR still on?
     
  5. Michalis Karatzis

    Michalis Karatzis Member

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    Ambient pressure always at 99kpa at sea level and 90kpa or lower at the mountains. It's a 2001 10p without EGR
     
  6. sierrafery

    sierrafery Well-Known Member

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    How much is the air flow when you hit the max boost
     
  7. Michalis Karatzis

    Michalis Karatzis Member

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    Hm...now that you mentioned it probably low. Maybe 450-500.

    New genuine MAF fitted few weeks ago.
     
  8. sierrafery

    sierrafery Well-Known Member

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    Then i'd check the turbo cartridge's blades on the exhaust side cos they might be burned out and the turbo doesnt spin up fast enough, mine was also low o boost and i fitted an uprated billet CHRA instead of the worn old core which made a huge difference... see this video

     
  9. Michalis Karatzis

    Michalis Karatzis Member

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    And this is what I was afraid...

    Any chance the wastegate doesn't close? Because of carbon deposit or something?

    Source for the CHRA?
     
  10. sierrafery

    sierrafery Well-Known Member

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  11. Michalis Karatzis

    Michalis Karatzis Member

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  12. sierrafery

    sierrafery Well-Known Member

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    Other thing which can reduce boost is warped exhaust manifold, after i skimmed mine and ceramic coated it i had to adjust the MBC and release the wastegate a bit cos it went to overboost after the manifold was fitted back without touching anything else
     
  13. Si Click

    Si Click Well-Known Member

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    Another vote for the Turbo Rebuild CHRA hybrid billet cartridge. Straightforward to fit as long as you follow the clear instructions to the letter and accurately mark/note the relative positions of the inlet and outlet elements in relation to each other and the cartridge so the assembled whole fits to the vehicle first time. The other tip I got after the event was to disconnect the oil return line from the engine, fit to the turbo and then reconnect at the engine. I must have spent over an hour trying to bolt it to the turbo whilst connected to the engine.
     
  14. Si Click

    Si Click Well-Known Member

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    For reference what mass flow figures should a healthy turbo be delivering?
     
  15. Michalis Karatzis

    Michalis Karatzis Member

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    In that case you had exhaust gas leaking from the interface of the manifold to the engine. I had a leak but it was fixed a while ago without skimming.
     
  16. sierrafery

    sierrafery Well-Known Member

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    If everything is OK the MAF should be around 600 at full boost, here's a list:
     

    Attached Files:

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  17. Si Click

    Si Click Well-Known Member

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    Very useful, thank you
     
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