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Thread: MHD link_ Bad HPFP?

  1. #1
    Join Date
    May 2019
    Location
    Cda idaho
    Posts
    8
    My Cars
    2011 335i sedan

    MHD link_ Bad HPFP?

    Run on my 2011 335i just flashed to MHD stage 1 91 octane. now my fuel pressure is really fluctuating and car goes lean when it does. lots of timing corrections where the psi drops. This is proof my HPFP is toast right? Or could my LPFP be the problem? Thanks guys.

    https://datazap.me/u/erzenble/2011-3...58&tmax=100.70
    Last edited by Erzenble; 05-20-2019 at 07:06 PM.

  2. #2
    Join Date
    May 2017
    Location
    Ontario, Canada
    Posts
    512
    My Cars
    335i E93 N54
    Hi Erzenble,

    I recommend working with MHD directly regarding their tune and your car. They'll be more familiar with their logs and such.
    I'd chime in, but I'm JB4 all the way. Fantastic performance, flexibility, logging and support.
    I tried to follow the MHD log, but I find that UI so messy.

    What boost is MHD Stage 1?
    I have to run 94 Octane with a BMS FMIC to support 15 PSI, and am currently adding WMI to help with timing and cooling of IATs.
    Also, depending where you buy gas, 91 can really fluctuate (Pioneer).
    It also takes the DME a few pulls before it identifies the correct Octane and adapts.

    There can be a big conversation. Or maybe it is simply HPFP. Though, it's not common to tap this out below 15 PSI, unless it was already failing.

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