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  • BMW F90 M5 dyno results stock versus JB4 tune Map 3, 5, and 7 - 665 awhp

      • BMW F90 M5 dyno results stock versus JB4 tune Map 3, 5, and 7 - 665 awhp

        Published on 11-23-2019 12:53 PM
        5 Comments Comments
        One of the things about the BMS JB4 that some overlook is that you can turn it off essentially by running Map 0. Additionally, you can change what the box does by running different maps and do so on the fly.


        What exactly do the different maps do?

        Map Guide as of v3 firmware:

        Map 0: Stock operation, JB4 disabled
        Map 1: Default performance map, 4psi peak request over stock
        Map 2: 22psi absolute boost profile, 93 octane OK. For competition packages cars and/or in warm/higher elevation climates map1 might out perform map2.
        Map 3: 25psi absolute boost profile, requires higher octane like unleaded racing fuel
        Map 4: Low boost VALET map -- Ideal for when "friends" are driving your car
        Map 5: 26psi absolute boost profile, requires unleaded racing fuel
        Map 6: User adjustable map. RPM1500 values of less than 6psi make map6 additive target based, values over 7psi make map6 absolute target based.
        Map 7: 27psi absolute boost profile, requires unleaded racing fuel
        Map 8: water/meth progressive map -- under development

        Here is an overlay between Map 0, Map 3, Map 5, and Map 7:


        Going from what is stock to Map 7 provides a boost of 142 lb-ft of torque at the wheels and horsepower increases by 91 at all four wheels.

        Not bad for a JB4 tune only, eh?

        This article was originally published in forum thread: BMW F90 M5 dyno results stock versus JB4 tune Map 3, 5, and 7 - 665 awhp started by Sticky View original post
        Comments 5 Comments
        1. Blown6's Avatar
          Blown6 - 11-23-2019, 02:07 PM
          The 3 maps all require race gas
        1. Sticky's Avatar
          Sticky - 11-23-2019, 02:12 PM
          Click here to enlarge Originally Posted by Blown6 Click here to enlarge
          The 3 maps all require race gas
          'Higher octane' but I'm not sure what fuel they ran. Maybe ethanol blended in? @Payam@BMS
        1. Payam@BMS's Avatar
          Payam@BMS - 11-23-2019, 03:53 PM
          Click here to enlarge Originally Posted by Sticky Click here to enlarge
          'Higher octane' but I'm not sure what fuel they ran. Maybe ethanol blended in? @Payam@BMS
          I'm not sure what gas was used on these runs. I haven't seen the logs either, maybe @Terry@BMS was working with the customer on this one?
        1. Blown6's Avatar
          Blown6 - 11-23-2019, 04:09 PM
          I believe map1-2 is more representative of what most customers will run. Map1 if limited to 91. Map2 if min 93 available. When running the higher maps 3+ , I would not try mixing a random amount of ethanol and ‘hope’ its ok. I would just go straight to race gas and call it a day. FWIW, i know they are working on a methanol kit to run the higher maps but it is still in testing. As always, My concern with 25psi+ boost and this motor is the rods....
        1. Sticky's Avatar
          Sticky - 11-23-2019, 04:14 PM
          Click here to enlarge Originally Posted by Blown6 Click here to enlarge
          I believe map1-2 is more representative of what most customers will run. Map1 if limited to 91. Map2 if min 93 available. When running the higher maps 3+ , I would not try mixing a random amount of ethanol and ‘hope’ its ok. I would just go straight to race gas and call it a day. FWIW, i know they are working on a methanol kit to run the higher maps but it is still in testing. As always, My concern with 25psi+ boost and this motor is the rods....
          You should definitely run race gas instead of blending and praying. Also have methanol for a safety on top IMO.

          This just goes to show what power you can hit with a JB4 on the various maps. I would do rods on one of these for piece of mind regardless.