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=== Compressor characteristic with required compressor / turbine power === '''Brief description''': BMWtchctr_pwr_Pctl_M '''Dimension''': 2D, table '''Categories''': Boost '''Unit info''': pressure ratio, g/s --> kW '''Breakpoints''': Compressor characteristic with required compressor / turbine power X (autogen) vs Compressor characteristic with required compressor / turbine power Y (autogen) '''Example''': 1.0 1.2 1.2 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.7 2.8 3.1 13.9 0.1 0.2 0.4 0.6 0.8 1.0 1.2 1.7 2.1 2.8 2.9 3.0 3.1 3.2 3.2 3.3 3.4 3.5 3.7 3.9 27.8 0.1 0.4 0.4 0.7 1.0 1.2 1.3 1.9 2.6 3.0 3.8 4.0 4.1 4.3 4.3 4.5 4.7 5.0 5.2 5.4 44.4 0.1 0.4 0.7 0.8 1.0 1.7 1.8 2.0 2.7 3.2 3.9 5.1 5.2 5.4 5.5 5.9 6.3 6.8 7.0 7.2 66.7 0.2 0.6 1.1 1.3 1.4 2.2 2.7 2.9 3.0 3.7 4.8 5.7 6.7 6.8 7.2 7.7 8.4 9.1 9.4 9.6 88.9 0.4 0.9 1.4 1.9 2.1 2.6 3.4 4.3 4.8 5.1 5.3 6.2 7.8 8.5 8.9 9.6 10.5 11.5 11.8 12.0 111.1 0.6 1.1 1.6 2.0 2.5 3.4 4.4 5.3 5.7 6.5 7.4 8.4 8.8 9.6 10.7 11.5 12.8 14.0 14.3 14.6 133.3 1.1 1.6 2.1 2.8 3.0 4.0 5.6 6.2 6.9 7.8 8.5 9.5 11.0 11.6 12.3 13.2 15.1 16.5 16.9 17.2 155.6 1.2 1.9 3.2 3.8 4.5 5.1 6.5 7.3 8.2 9.1 10.1 11.1 12.2 14.1 14.5 15.6 16.4 18.1 19.5 19.9 177.8 1.4 2.8 4.0 4.8 5.5 6.3 7.3 8.4 9.4 10.1 12.0 12.8 14.2 16.0 16.2 17.1 17.8 19.9 22.7 24.6 200.0 2.0 3.3 5.2 6.1 7.1 8.1 8.8 9.6 10.9 11.8 13.3 14.9 16.9 17.9 18.3 19.9 20.9 23.2 25.0 27.5 222.2 3.1 4.9 6.2 7.6 8.8 9.5 10.2 11.7 12.8 14.3 15.6 17.2 18.1 18.9 20.2 21.3 22.8 25.7 27.0 30.2 250.0 3.4 7.1 8.3 9.4 10.4 11.7 12.7 14.1 15.5 16.5 17.7 19.8 20.3 21.5 23.1 24.5 25.9 28.0 29.6 32.9 277.8 4.1 9.0 11.0 13.1 14.2 17.0 18.4 19.4 19.5 20.7 21.4 22.0 23.3 24.6 25.6 27.4 29.4 32.2 33.6 36.6 305.6 5.9 12.5 14.3 15.9 17.2 19.6 21.3 22.3 22.8 23.8 24.9 26.1 27.3 28.7 30.0 32.0 35.0 37.5 39.7 41.9 347.2 7.7 16.3 17.8 20.3 21.6 23.3 23.7 24.7 25.1 26.0 27.7 30.2 31.8 33.6 35.7 38.4 41.1 44.0 46.2 48.8 388.9 9.2 17.5 20.2 22.4 24.1 25.7 26.1 27.1 27.4 29.6 32.5 36.4 39.8 41.3 44.1 47.0 51.0 53.7 56.7 59.4 '''Notes''': This table is pressure ratio and airflow to turbine power (in kW). It can be thought of as the ''how hard and fast to push the turbo map''. It can also be thought of as the handoff between the intake side and exhaust side of the turbo in that the power required from the compressor (to provide boost) becomes the target for the exhaust turbine. The actual power target has to be corrected for temperature, using a formula, because there is no temperature axis here. To gain some intuition about the power available from the exhaust, consider that if the '''engine''' is putting out 200Hp into the crank, but is only 33% efficient, there is another 400Hp gone somewhere. The turbo catches a chunk of this, so the turbine power can be surprisingly high. At the right of the stock table, for example, 59.4kW equates to about 80Hp. Even middling values in the table would power a lawn tractor. The stock table is well calibrated by BMW engineers (we assume). The problem for custom tunes with upgraded turbos is that the airflow can go beyond the axis limit of 389 g/s. In that case, one can look at ''compressor base kw'' and ''compressor after p-d kw'' logging parameters.
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