320d - E46 - 2003 - Synergy tuning box

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  1. 320d - E46 - 2003 - Synergy tuning box 
    #1
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    digby's Car Details
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    Dear All - and TheEnd in particular

    I have come across the existance of a tuning box called the Synergy 2a

    It is widely discussed on freelander forums and is claimed to greatly improve the performance of the 2 litre BMW engine fitted to the Freelander Td4 cars. It seems that the engine has been de-tuned for the Land Rover to around 115 BHP

    The box is also available for BMW's and a wide variety of other diesel cars

    Could somebody (TheEnd maybe) please give their comments on the box ???

    Is it dangerous ?
    Does it really change the injection / boost map or is it just another fuel pressure booster ???

    thanks for your input

    Digby
     
     

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    #2
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    It looks a little like they have made a quantum leap, but in the wrong direction.

    All I can see it doing is releasing some power where it would be clipping on the smoke map.
    At a given pedal position, the ECU will be looking for a certain amount of torque, and if the torque limiters allow this, it will try to inject it.

    The MAF signal only comes into play in the smoke limiter map on older BMWs or the Lambda map on newer ones. This is a quick calculation to find the maximum allowed injection quantity before it gets too rich and smokes.
    Lifting the MAF signal give it that extra bit of room.

    I can see how it would work at low revs, I don't think the tuning boxes have much of an effect at lower RPMs as they can be giving
    a % difference to the rail pressures. Lower rail pressure means that % isn't a hell of a lot.


    Ideally, what I would have liked to have seen a tuning box manufacturer do is tap into the boost signal and increase the boost. This is another way to avoid the smoke limitation and again add more fuel.

    It's quite possible that changing the boost pressure signals (MAP sensor) is something that the ECU could spot easily, so maybe that's why it isn't used very often.



    The usual tuning box side will increase the rail pressures, and sneak more fuel in, the MAF side will double up on this, with some extra coming in from hidden higher rail pressures, and some from more air and avoiding the smoke limits.
    I can't see it actually increasing boost pressure unless the ECU has a table for target boost pressure based on airflow(tweaked) and RPM.
     
     

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    #3
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    Thanks for that - but is it worth considering ??

    Or maybe there is a better solution for the Freelander ECU ??

    Digby
     
     

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    Well, unless they have done it for fun, it probably is better than a regular tuning box in some ways.

    If I was going to buy a tuning box, I'd still choose the cheapest available that has adjustment though.
     
     

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    I read somewhere that the synergy box is used on landrover if they are using a different maf or something like that.
     
     

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