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Thread: Is 0.58 bar turbo pressure at 3000rpm about right for a Td5?

  1. #1
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    Is 0.58 bar turbo pressure at 3000rpm about right for a Td5?

    Hi, trying to get to the bottom of a lack of performance in a 10P Td5 manual. It won't rev beyond 3000rpm at which point it is putting out 0.58 bar turbo pressure under load. Everything to do with the turbo pressure seems ok - have checked wastegate movement, wastegate actuator has plenty of tension, have adjusted actuator rod between 8-13 turns visible, replaced wastegate actuator modulator (didn't seem to make any difference), silicon hoses are tight and in good nick, EGR delete, large intercooler (which presumably increases lag a bit but shouldn't affect max turbo pressure much?).

    My MAF readout is within specs. AAP possibly a bit out? I understand it should be around 100; mine is 95 but only drops 2-3 units to 3000rpm which I understand is about right.

    I'm now thinking that maybe the problem is fuel delivery. I have a Storm-tuned ECU and fuel filter has been replaced. Fuel pump sounds ok. If 0.58 bar turbo pressure is about right at 3000rpm, maybe with the right fuel pressure I'll be able to get to 4000 rpm which will get to closer to 1.3 bar turbo pressure?

    Thoughts?

  2. #2
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    Blocked exhaust?
    Regards PhilipA

  3. #3
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    0.58 bar is only about 8 psi which is too low, at 3000rpm on my d2 Manual makes 1.80 bar

    Have you check the little pipes on the wastegate and the intercooler pipes for splits or damage?

  4. #4
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    I suspect you will need the following part

    PMK100130

    Might be wrong but have seen this before

  5. #5
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    Did you clean the MAP sensor ?
    Discovery Td5 (2000), manual, tuned

  6. #6
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    So will it rev beyond 3000 rpm when not in drive? Say in 2nd?

    When did you get the new tune? I'm guessing it hasn't coincided with the lack of performance... did you get the tune because it was already very poor?

    Cheers
    James

  7. #7
    discorevy is offline ChatterBox Silver Subscriber
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    you're probably on the right track with fuel delivery, so a pressure test is the go there , but check to make sure your aftermarket intercooler isn't split somewhere

  8. #8
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    Thanks for all the replies. I'll have a closer look at all of the above but I don't think it is any of them. Unfortunately I've had this problem ever since I've had the vehicle. Graeme Coopers thought it just needed more fuel and installed a TRS ECU which improved performance a bit but still didn't allow me to rev over 3000rpm. The problem also preceded the new intercooler and the latest Storm ECU and I've changed the wastegate modulator and have a straight-through exhaust. I regularly clean the MAF and have also tried a new MAF which didn't improve things. I understand that there is a mesh fuel filter in the engine bay which I'll check if I can work out where it is. Otherwise maybe the fuel pump isn't delivering enough pressure... I've fitted lots of stuff to try to improve performance over the years...so I'm sure she'll go like the clappers once I work out what this last impediment is!

  9. #9
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    Engine will still run up to 3000 with a non working fuel pump. worth a look.
    I once drove Melb to Bairnsdale with pump dead and disconnected.
    Terry
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
    2010 Guzzi 750

  10. #10
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    Quote Originally Posted by feraldisco View Post
    I regularly clean the MAF and have also tried a new MAF which didn't improve things. I understand that there is a mesh fuel filter in the engine bay which I'll check if I can work out where it is.
    The MAF would not have much effect if the EGR is deleted on a 10P engine... the most important on Eu2 engine is the MAP sensor which i mentioned but you didnt say anything about it

    that mesh filter in the engine bay is actually in the head under the FPR
    Discovery Td5 (2000), manual, tuned

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