Overview
Purpose of this document is to explain the tuning tables available in v1.0 of the bootmod3 CustomROM for the vehicles:
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For a high-level overview of the features in the bootmod3 CustomROM release as well as changes in the new Map Editor features refer to this document:
bootmod3 CustomROM V1 Features + New Map Editor + UI Enhancements
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In the above example, we’ve activated all four switchable maps meaning tables under BM3 bootmod3 CustomROM → MapSwitch → Map 2, 3 and 4 will be tuned for a multi-map setup.
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Final Base Ign. Timing Target (After Blend Factor) = Map2 Ign. Target + (Flex Fuel Ign Target - Map2 Ign. Target) x Blend Factor for Ignition |
Putting this into actual values for our example at 7500rpm and 220 Load:
Final Ignition Timing Target for 50% ethanol on Map Slot 2 with Flex Fuel Enabled = 10 + (16 – 10) x 0.7 = 14.2 deg
You can see how the underlined portion easily allows for dynamic blending based on ethanol blend factor table setup between the base map table and the flex fuel table in this case.
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Ethanol Content Sensor Override on LiveAdjust Screen: In the case of a Flex Fuel sensor or ECA device failure, we’ve added a way for the users to override the ethanol content % value seen by the DME. This overrides any existing sensor value and is to be used with ** CAUTION ** and only in the cases where for instance vehicle will not start up on a full tank of ethanol and the sensor has become faulty. Some have reported wanting to use the override when at race events where the ethanol % of the fuel in the tank is WELL known and having a chance of a sensor failure ending up in poor results is not an option. ** Override disables with ignition in the OFF position.
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FLEX FUEL HARDWARE SETUP REQUIREMENTS ** Overview of the how the sensor data travels looks as follows: Flex Fuel sensor can be installed on the feed line as the factory BMW S55/N55/B58 fuel system is return-less. If using the feed line, it is strongly recommended to use a splitter in the line where the sensor is installed to avoid introducing any fuel flow restrictions at higher power levels with higher fuel volume demand. |
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When tuning the above features it is highly advisable to add the following CustomROM BM3 bootmod3 RAM channels to your datalogging setup as well as use the appropriate other RAM channels below to get a complete understanding of the task at hand. Default channels that come preset are in some cases limited in what they show and internal RAM variables are a better reference.
bootmod3 New RAM Channels For Datalogging (only CustomROM):
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bootmod3 Antilag Active
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bootmod3 Flex Blend Factor (Fuel)
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bootmod3 Flex Blend Factor (Ign.)
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bootmod3 Flex Blend Factor (Trq.)
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bootmod3 Flex Ethanol %
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bootmod3 Flex Ethanol % (Sensor)
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bootmod3 Flex Fuel Temp
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bootmod3 Flex Sensor Fault
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bootmod3 Fuel Corr. (Base)
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bootmod3 Fuel Corr. (Final)
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bootmod3 Fuel Corr. (Flex Adder)
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