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=== Application documentation (aka Funktionsrahmen) === Unfortunately, functions described in the A2L are not always simple, can have dozens of inputs and outputs and what is happening inside them is not guessable. In this case, and for more specialist tuning goals, you need a ''Funktionsrahmen'' (FR or FRM), which is a PDF export of the computation paths in the DME generated from the (Matlab Simulink) code. Important sections might also contain text and diagrams that help to explain the strategies. For any given software version, the DME code consists of '''two''' levels, each with its own FR: # A ''supplier'' layer provided by Bosch. In general, this is focused on low-level support functions. It can be somewhat useful for tuning, for example, knock detection is covered in this document. # A ''BMW'' application layer. This has a lot of useful information about timing, lambda control, fuel injection and turbo control. Unfortunately, FRs can be hard to obtain, especially in the software version of your choosing and many people work from FRs that relate to versions only somewhat related to their car.
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