M51 2.5ltr Turbo Diesel 'Chip Tuning' - Page 3

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Thread: M51 2.5ltr Turbo Diesel 'Chip Tuning'

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    #21
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    Perfect, The chips are on the way, so I'll give you a shout when they arrive.
     
     

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    #22
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    Quote Originally Posted by TheEnd View Post
    Perfect, The chips are on the way, so I'll give you a shout when they arrive.
    expect a PM in the next 10 days or so fella
     
     

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    #23
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    Grab the ECU and have a look at the numbers on the chips inside and on the outer case.
    That will let me know which software version you've got install already.
     
     

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    #24
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    Quote Originally Posted by TheEnd View Post
    Grab the ECU and have a look at the numbers on the chips inside and on the outer case.
    That will let me know which software version you've got install already.
    where exactly is the ECU mate?
     
     

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    #25
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    You have a 325tds?
    If so, it's in behind the fusebox on the passenger side.
    You'll see a foam rubber cover, and behind that a plastic plate with 5 hex head screws.

    Remove this and you'll find a compartment where the ECU sits.

    If you have a 525tds, it's under a black plastic cover on the driver's side, right up close to the bulkhead.
     
     

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    #26
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    I may be looking at getting some of these chips in the new year after reading this thread.

    I have an E34 525 tds, so I'm guessing the expected output after chipping would be around 170-180BHP yes??
     
     

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    #27
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    More towards the low end, for more power you would need to mechanically adjust the turbo yourself.
     
     

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    #28
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    Well, despite my car having a fault at present, when the thing is behaving itself I can certainly vouch for the improved performance! Most pleasing is prehaps the improved low down torque. Don't get me wrong, it's no V8, but it just seems to pick up cleaner and seems less prone to bogging down. That includes when cold!
    Once above 2000revs it surges forward with similar momentum to a 525i petrol (from what I can remember, my 525i is totaly stripped now so a bit faster again).
    It's certainly capable of catching people out!

    I just to get that blumin fault sorted now so it stops reverting back to limp home mode! (it was doing this before I fitted the chips)

    Smiler.


    All above vehicles plus more covered on my website. URL on request (has a small For Sale section so against forum rules to publish link).
     
     

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    #29
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    Quote Originally Posted by TheEnd View Post
    More towards the low end, for more power you would need to mechanically adjust the turbo yourself.
    On this note, how does the ECU control the boost?? I had a look under the bonnet the other day and noticed the actuator is plumbed directly into the compressor outlet, I thought there'd be a solenoid or something in between.
     
     

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    #30
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    On the older ECUs, it can't directly control the boost, all it can do is keep an eye on it, and reduce fueling if it's getting too high to avoid overboosting if the actuator jams

    As you can see on yours, you don't have any direct ECU control over it (which I admit, I did say it was possible at the start of the thread, but not in these specific cases)
     
     

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