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Apprentice: understanding the MPPSK map
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==== Torque request ceiling ==== '''Ref''': [[DME_table_reference#Torque_request_ceiling|Torque request ceiling]] '''Brief Description''': BMWtqe_tqc_FlApplStgNorm_T '''Dimension''': 1D, vector '''Categories''': Limits '''Unit info''': 1/min --> Nm '''Breakpoints''': Torque request ceiling X (autogen) '''Base''': 800 900 1000 1250 1380 1500 1520 2000 2500 4500 4750 5000 5200 5500 6000 6500 6750 7000 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 490.0 474.0 458.0 434.0 398.0 368.0 353.0 333.0 '''Difference''': 1000 1100 1200 1300 1380 1450 1520 2000 2500 3000 3500 4000 4800 4900 5500 6000 6500 7000 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 10.0 26.0 42.0 61.0 62.0 54.0 36.0 17.0 '''Modified''': 1000 1100 1200 1300 1380 1450 1520 2000 2500 3000 3500 4000 4800 4900 5500 6000 6500 7000 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 500.0 495.0 460.0 422.0 389.0 350.0 '''Notes''': This table defines the range of torque input from the accelerator pedal vs RPM. Also checkout the relative torque request tables which add engine load as another dimension. You can see that torque ranges from 500Nm at low RPM to 350Nm at redline. You might reasonably ask 'why would you drop the torque request at higher RPM?'. To answer this question it's important to understand that the torque requested from the ECU is not the torque the car actually delivers. From the torque request, the ECU calculates a ''load request'' (i.e. it works out how much air should be in the combustion chamber). From this load request is then calculates the required boost. Both load and boost are themselves limited, in the ECU and by the hardware on the car. So while it is possible to raise the torque here, you want to be sure that load and boost limits are consistent and that the turbo can actually deliver the boost required. For most tunes, you will want more torque. For this tune, we know that the stock turbo is not very capable above 5000 RPM so we can understand that the BMW engineers have put in conservative values.
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