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== Boost == === Intake Waterpump flow ( IAT minus ambient temp, ambient temp) === '''Brief description''': KF_VSEWP_LLK_TANS '''Dimension''': 2D, table '''Categories''': Boost '''Unit info''': °C, °C --> l/h '''Breakpoints''': Intake Waterpump flow ( IAT minus ambient temp, ambient temp) X (autogen) vs Intake Waterpump flow ( IAT minus ambient temp, ambient temp) Y (autogen) === Boost Ceiling === '''Brief description''': K_MAX_PSSOLBER '''Dimension''': constant '''Categories''': Boost '''Units''': bar === Lower speed threshold for leak detection (Untere Drehzahlschwelle f. Leckageerkennung) === '''Brief description''': BMWtchdiag_n_EngMin_C '''Dimension''': constant '''Categories''': Boost '''Units''': 1/min '''Example''': 2000 '''Notes''': The units here are 1/min. Apparently the stage-1 tune is disabling the check. === Maximum target boost pressure due to diagnosis of the boost pressure sensor (Maximaler Sollladedruck wegen Diagnose Ladedrucksensor) === '''Brief description''': BMWtchsp_p_ReqMax_C '''Dimension''': constant '''Categories''': Boost '''Units''': hPa '''Example''': 2500.000 '''Notes''': Apparently, this parameter is telling The ECU the maxium useful pressure reading from the 'boost pressure sensor'. The units are hPa. 3000 hPa is about 44 psi. === Boost set limit === '''Brief Description''': KL_FPLDPUMP '''Dimension''': 1D, vector '''Categories''': Boost '''Unit info''': g/s --> bar '''Breakpoints''': Boost set limit X (autogen) '''Example''': 138.9 148.6 166.7 180.6 201.4 222.2 236.1 291.9 2.576 2.605 2.665 2.710 2.807 2.911 2.958 3.000 '''Notes''': These are boost limits as a function of air mass flow. The values refer to '''chargepipe''' measurements (3 bar = 43 psi). === Boost Limit multiplier === '''Brief description''': KF_FPLDMAX '''Dimension''': 2D, table '''Categories''': Boost '''Unit info''': g/s, °C --> - '''Breakpoints''': Boost Limit multiplier X (autogen) vs Boost Limit multiplier Y (autogen) '''Example''': 291.7 313.9 333.3 361.1 375.0 388.9 402.8 423.6 25 3.000 3.000 3.000 2.874 2.664 2.329 2.150 2.150 30 3.000 3.000 3.000 2.874 2.664 2.329 2.150 2.150 35 3.000 3.000 3.000 2.874 2.664 2.329 2.150 2.150 40 3.000 3.000 3.000 2.874 2.664 2.329 2.150 2.150 60 3.000 3.000 3.000 2.874 2.650 2.198 2.000 2.000 80 3.000 3.000 3.000 2.874 2.650 2.184 2.000 2.000 '''Notes''': This is a table of airflow in g/s vs temperature in °C. Maxing out to 4 is an option since boost should be under control if torque and load limits set correctly. === 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. === Min. boost setpoint to cancel PIDs by decreasing target pressure === '''Brief Description''': BMWtchctr_rat_p_ComprLimPctl_T '''Dimension''': 1D, vector '''Categories''': Boost '''Unit info''': g/s --> - '''Breakpoints''': Min. boost setpoint to cancel PIDs by decreasing target pressure X (autogen) === Perf display scaling - power === '''Brief Description''': K_EDA_P_ANZ_SPORT_BS_SCAL_CODE '''Dimension''': 1D, vector '''Categories''': Boost '''Notes''': The guages work by splitting the power dial into 8 sections and then exposing parameters which define the power ''per section'' of the guage. [[File:Sports-displays.png]] The allocation of cells according to units is as follows: [[File:Guage-scaling.png]] Note, that the tunerpro setup defines these as arrays, but the DME has them as individual values K_EDA_P_ANZ_SPORT_BS_SCAL_CODE0, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE1, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE2, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE3 '''and''' values are in reverse order. Thus the correspondence with units is * CODE0 --> kW * CODE1 --> kW * CODE2 --> PS (i.e. metric HP) * CODE3 --> other The ''other'' slot tells the DME's what to do in case is receives a nonsense unit so can be left stock. === Perf display scaling - torque === '''Brief Description''': K_EDA_MD_ANZ_BS_SCAL_CODE '''Dimension''': 1D, vector '''Categories''': Boost '''Unit info''': - --> - '''Breakpoints''': <labels> '''Notes''': See notes on the scaling for power above. === PID correction ceiling === '''Brief description''': BMWtchdiag_pct_WgPLo_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': hPa, - --> % '''Breakpoints''': PID correction ceiling X (autogen) vs PID correction ceiling Y (autogen) '''Example''': 0 100 200 300 1.0 12.103 11.551 10.449 -0.003 1.4 11.551 10.449 3.299 -0.003 1.6 10.449 3.299 1.099 -0.003 1.8 -0.003 -0.003 -0.003 -0.003 '''Notes''': This is the max upward percentage correction to the boost setpoint (i.e. to the pressure ratio). The x-axis is the amount of ''underboost'' hPa (300 hPa is about 4psi). It is important to note the sign, since it is counterintuitive (a -ve boost deviation is overboost and +ve one is underboost). The y-axis here is claimed to be the current boost setpoint. This is confusing or questionable. The floor and ceiling table y axes form a continuous set of values from 0.4 to 1.8. The correction floor table axis runs from 0.4 to 1.0 while the ceiling table from 1.0 to 1.8. So the ceiling table takes off where floor table stops. It's not clear why that would be. These questions need not hinder progress because valid values are -100% across the entire correction floor table and +99% across the entire correction ceiling table. === PID correction floor === '''Brief description''': BMWtchdiag_pct_WgPHi_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': hPa, - --> % '''Breakpoints''': PID correction floor X (autogen) vs PID correction floor Y (autogen) '''Example''': -300 -200 -100 0 0.4 -4.001 -4.999 -6.000 -7.999 0.6 -4.999 -6.500 -9.000 -12.000 0.7 -6.000 -7.999 -10.999 -14.001 1.0 -7.001 -10.999 -13.000 -14.999 '''Notes''': See [[DME_table_reference#PID_correction_ceiling|PID correction ceiling]]. We will generally max out these values to -100%. === WGDC P factor === '''Brief description''': BMWtchctr_pwr_CmprGra_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': -, g/s --> kW '''Breakpoints''': WGDC P factor X (autogen) vs WGDC P factor Y (autogen) '''Example''': 1.0 1.3 1.5 1.7 1.8 1.9 2.0 2.1 2.3 2.5 2.8 3.1 13.9 6.8 5.4 4.5 3.6 3.2 2.9 2.6 2.3 1.7 1.3 0.8 0.8 27.8 7.3 6.0 5.0 4.2 3.8 3.4 3.1 2.8 2.3 1.8 1.3 1.3 66.7 8.9 7.6 6.6 5.8 5.4 5.0 4.7 4.4 3.8 3.3 2.8 2.8 111.1 10.9 9.5 8.6 7.7 7.3 6.9 6.6 6.3 5.7 5.1 4.5 4.5 155.6 12.9 11.6 10.7 9.8 9.4 9.0 8.6 8.2 7.6 7.0 6.2 6.2 200.0 14.9 13.7 12.8 11.9 11.4 11.0 10.6 10.2 9.5 8.8 7.9 7.8 222.2 16.0 14.8 13.8 12.9 12.5 12.0 11.6 11.2 10.5 9.7 8.9 8.6 250.0 17.3 16.1 15.2 14.2 13.8 13.3 12.9 12.4 11.6 10.8 9.8 9.6 277.8 18.6 17.4 16.5 15.5 15.0 14.6 14.1 13.6 12.8 11.8 10.7 10.5 305.6 19.8 18.7 17.8 16.8 16.3 15.8 15.3 14.8 13.9 12.8 11.7 11.3 347.2 21.6 20.6 19.6 18.6 18.1 17.5 17.0 16.4 15.4 14.2 12.9 12.3 388.9 23.3 22.3 21.3 20.2 19.7 19.1 18.5 17.9 16.7 15.4 14.0 13.2 '''Notes''': Acting alongside the compressor characteristic which provides the required turbine power, this table provides the P-coefficient to apply to the measured compressor error. === WGDC D-Factor === '''Brief description''': BMWtchctr_pwr_Dp_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': hPa, hPa --> kW '''Breakpoints''': WGDC D-Factor X (autogen) vs WGDC D-Factor Y (autogen) === WGDC D correction === '''Brief Description''': BMWtchctr_fac_Dp_T '''Dimension''': 1D, vector '''Categories''': Boost, WGDC '''Unit info''': kW --> - '''Breakpoints''': WGDC D correction X (autogen) === WGDC D correction (spool) === '''Brief Description''': BMWtchctr_fac_DpDyn_T '''Dimension''': 1D, vector '''Categories''': Boost, WGDC '''Unit info''': kW --> - '''Breakpoints''': WGDC D correction (spool) X (autogen) === WGDC P correction === '''Brief description''': BMWtchctr_p_DifCrtnPp_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': hPa, g/s --> hPa '''Breakpoints''': WGDC P correction X (autogen) vs WGDC P correction Y (autogen) '''Example''': -500.0 -50.0 -20.0 -10.0 -5.0 0.0 5.0 10.0 30.0 50.0 100.0 500.0 20.8 -500.000 -29.750 -8.375 -2.000 -2.000 0.000 2.500 5.000 8.500 25.875 144.000 856.000 55.6 -500.000 -32.750 -8.500 -3.750 -2.000 0.000 3.000 11.000 20.000 47.375 150.000 756.000 138.9 -500.000 -65.000 -37.250 -15.000 -5.500 0.000 7.125 28.625 64.125 100.625 206.000 688.000 180.6 -500.000 -65.000 -39.875 -15.000 -6.000 0.000 7.125 20.875 69.000 112.375 208.250 740.500 227.8 -500.000 -65.000 -39.875 -15.000 -6.000 0.000 7.125 22.125 62.375 125.875 210.750 800.000 277.8 -500.000 -65.000 -39.875 -15.000 -6.000 0.000 7.125 15.375 63.125 140.000 213.375 800.000 '''Notes''': The German translation for the description states: ''Correction of the pressure difference for the P component of the performance-based boost pressure regulator.'' It seems that 'pressure difference' here is the boost error. The relationship to the power-based P factor needs clarifying. === WGDC P correction (spool) === '''Brief description''': BMWtchctr_p_DifCrtnPpDyn_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': hPa, g/s --> hPa '''Breakpoints''': WGDC P correction (spool) X (autogen) vs WGDC P correction (spool) Y (autogen) === Wastegate Position - für Vorsteuerung === '''Brief description''': BMWtchctr_pct_WgBasc_M '''Dimension''': 2D, table '''Categories''': Boost, WGDC '''Unit info''': -, g/s --> - (MAF, wg duty cycle) --> (percentage flow through turbo) '''Breakpoints''': Wastegate Position - für Vorsteuerung X (autogen) vs Wastegate Position - für Vorsteuerung Y (autogen) '''Example''': 0.30 0.44 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 1.00 0.000 89.9 91.0 92.2 95.0 96.0 97.0 98.0 99.0 100.0 100.0 100.0 100.0 27.778 81.0 86.0 91.0 94.0 95.0 96.7 97.7 98.3 98.5 98.8 99.0 100.0 55.556 76.1 82.1 85.1 87.5 89.3 90.4 92.8 95.0 97.0 97.6 98.7 100.0 83.333 68.0 76.9 80.0 84.2 86.6 89.7 91.6 93.5 95.0 96.9 97.5 100.0 111.111 65.5 72.0 76.0 82.2 85.2 88.0 90.6 93.3 94.5 96.3 96.9 100.0 138.889 62.8 67.0 73.0 78.0 84.5 87.5 90.3 92.5 94.0 95.7 96.3 100.0 166.667 60.0 63.0 72.0 77.5 83.5 87.3 90.0 91.0 92.0 94.1 95.6 100.0 194.444 60.0 62.0 71.5 77.1 83.2 86.0 89.5 90.2 91.0 93.6 95.0 100.0 222.222 60.0 61.0 71.5 77.0 82.0 85.0 89.0 89.1 90.0 93.0 94.4 100.0 250.000 60.0 60.0 70.0 76.8 79.1 83.3 88.0 88.2 89.3 92.5 94.0 100.0 277.778 60.0 60.0 67.4 73.6 79.0 84.0 86.7 87.4 88.7 91.4 93.8 100.0 305.556 60.0 60.0 66.0 70.0 75.0 80.0 85.3 86.5 88.0 90.4 93.8 100.0 '''Notes''': This table models the percentage of gas flow through the turbo as a function of total exhaust flow and wastegate position. For example, looking to the rightmost column, when the wastegate duty is 100%, the wastegate is fully closed and the turbo flow is 100%. For tuning purposes, the rows only extend to 305 g/s of MAF. When maxing out the stock turbo, airflows of about 440 g/s are better and for hybrids, 550 g/s or so. === Max factor for the increase of WGDC due to P and D === '''Brief Description''': BMWtchctr_fac_pwr_CompLimPctl_T '''Dimension''': 1D, vector '''Categories''': Boost, WGDC '''Unit info''': g/s --> - '''Breakpoints''': Max factor for the increase of WGDC due to P and D X (autogen) '''Example''': 194.4 208.3 236.1 277.8 305.6 333.3 1.500 1.247 1.089 1.060 1.060 1.060 '''Notes''': Interestingly, the stage-1 map tapers this down a bit.
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