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  1. #1
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    Standback boost control and WG control logic.

    CP-E,

    I was wondering if you could give us some insight on how the standback works and it's functions. As you may have seen, there have been plenty of debates on how tunes control boost and the way they manage WG DC % to hit target psi.

    With the standback being new to the N54 platform, I was hoping you could explain a bit on how this is done.

    Does the standback isolate input and output signals to adjust WG DC out in both directions? Or do you simply pull the factory signal to ground to increase effective DC ?

    What about power signal? What do you tap into to provide power to the standback?

    Hopefully you can give us an explanation of the standback's methods to help us better understand it's capabilities.

    Thanks.

    Alex
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  2. #2
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    The standback controls the wastegates independently from the car's ecu. It actually drives the solenoids itself and feeds a fake boost signal back to the ecu. Getting that fake signal right has actually been the biggest hurdle to date but since it's resolution, the thing functions flawlessly. Power is taken from the 50 amp fuse in the ecu compartment. That's about the extent of my knowledge on how it functions. I'll try to get their EE to chime in. He's a genius.

  3. #3
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    Thanks for your feedback. Im wondering if the standback can control WG to provide a 0psi boost map. I would also like to know what it taps into for a power source.
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  4. #4
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    No it cannot, the standback does not control boost untill 6 psi.

  5. #5
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    I will be putting up a HUGE write up for you guys. We have a few different versions of the software/firmware that allows to control boost in MANY different ways. The public release independently drives the boost setup so that we can just enter in values (psi) and run them flawlessly.

    Laloosh mentioned to us a while back that we needed to be able to provide 0 psi during the shifts because of a shift bog on the 6mt which is a problem of the stock mapping. We then attacked that problem.

    The way the standback works is running transparent to the n54 dme so that we can make changes in real time and have the dme change to whatever value we want. Using 30x30 maps it makes it very very very nice to control everything at such a fine resolution.
    Custom Performance Engineering
    www.cp-e.com
    BMW N54/N55 | Forced Induction | Direct Injection Specialists

    Supporting BMW 1M | 135i | 335i | 535i and more

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  6. #6
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    Great, looking forward to your write up.
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