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=== AKRGRCCAT === '''Brief description''': AKRGRCCAT '''Dimension''': 2D, table '''Categories''': Exhaust '''Unit info''': 1/min, gear --> acc. pedal position % '''Breakpoints''': AKRGRCCAT X (autogen) vs AKRGRCCAT Y (autogen) '''Notes''': These exhaust flap maps provide the pedal position required to open the exhaust flap. To decode the names of these tables, AKR stands for resonator exhaust flap (Abgasklappe fΓΌr Resonator). Suffixes are then CC for cabriolet closed (convertible tops with the roof closed or normal cars with a roof) and CO (convertibles with the roof open). Then AT (automatic shift mode) and MT (manual shift mode) and finally M (sport mode). For example, AKRGRCOATM is the map for a convertible with the roof open is auto mode with sport or sport plus selected. Additionally, there are base and VAR1, VAR2, VAR3 variants of each of the table above. There is a coding parameter (CodVar_stAKR) which determines which variant the car thinks it is. For practical purposes, it might be easier to focus on any differences between manual and sport modes and copy these settings into all variant slots. Astute readers will notice that MHD's ''exhaust flap always open in sport mode'' simply wipes out a ton of this pointless complexity. The downside of this is that the car can produce a drone if using sport around town. Custom tunes might therefore want to keep the flap closed below, say, 2000RPM. The tables above are not always active. The overall control of the exhaust flap is determined by a hierarchical decision process as follows: * OBD testing tools like ISTA+ have top priority if they are activating the flap. * At startup, the DME considers the engine temperature and car's speed. If the engine is warm, the flap is opened until an initial timeout expires. If the engine is cold, the flap will close once the car is moving. * The DME might open the flap during cat heating depending on coding, options, car speed and RPM. * Whether burble settings are enabled. * The accelerator pedal position.
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