Close

    • B58 JB4 + E85 BEF dyno results on factory HPFP - 461 rwhp 2017 BMW G30 540i with BMS B58 intake, JB4, and MHD V1 BEF

      This is interesting as BMS and MHD are getting a lot of power on the factory HPFP. E85 is key here but keep in mind this is a roughly 40% E85 blend (E40) with 91 octane. The MED V1 back end flash for this E85 blend is of course key along with the JB4 for tuning.


      They get 461 rear wheel horsepower out of the car:


      Now this is probably as far as you will get output wise on the factory fuel system. BMS said they were losing fuel pressure so to go beyond this level you will need methanol or a CPI (charge pipe injection) setup providing supplemental fuel.

      Quote Originally Posted by BMS
      Hit the dyno today with the 540i development car to test our new B58 JB4 MHD E85 back end flash map. Test car is a 2017 model all stock with BMS intake, JB4, and our off the shelf v1 E85 back end flash map loaded via MHD. Fuel mixture was around 40% E85 and the rest 91 octane.

      Testing out a new version of JB4 map3 which targets around 20psi peak but is set to purposely under target a psi or two, peak boost on the dyno run was 19psi. Played around a bit with timing but found we're pretty close to MBT here.

      The real limiting factor for us is fuel pressure so we ran it as lean as we feel safe letting it run on the E85 mixture, and even so fuel pressure was starting to tank as you can see in the log. Fortunately Fuel-IT has a CPI kit in the works so options to take it beyond this will not only be limited to WMI. Although, WMI does wonders!



      This article was originally published in forum thread: B58 JB4 + E85 BEF dyno results on factory HPFP - 461 rwhp 2017 BMW G40 540i with BMS B58 intake, JB4, and MHD V1 BEF started by Sticky View original post
      Comments 7 Comments
      1. 135idct's Avatar
        135idct -
        why the AFR is lean from 3k rpm to 5k? safe?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 135idct Click here to enlarge
        why the AFR is lean from 3k rpm to 5k? safe?
        @Terry@BMS @Payam@BMS
      1. Payam@BMS's Avatar
        Payam@BMS -
        Your tags don't work.

        Lean AFR is normal for these motors, as long as trims are not maxed out and fuel pressure is stable, you're good.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        Your tags don't work.
        @Payam@BMS didn't work?
      1. 135idct's Avatar
        135idct -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        Your tags don't work.

        Lean AFR is normal for these motors, as long as trims are not maxed out and fuel pressure is stable, you're good.
        even with BEF
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by 135idct Click here to enlarge
        even with BEF
        I think Terry was testing when it gets too rich these motors misfire. He did all the testing with the flash, it's still a bit new to me.

        Edit: Just spoke with Terry. It depends on the flash, with e85 we run it leaner so we don't run into fuel pressure issues Click here to enlarge
      1. ///B58's Avatar
        ///B58 -
        Click here to enlarge Originally Posted by 135idct Click here to enlarge
        even with BEF
        I'm on the BEF/E40/100% Meth and my AFR is 12.9-13.2 so it's really not that lean i think its perfect.
        Anything richer then that imho is a overkill considering it a modern direct injected engine.