Aftermarket Upgrade Sensor Data

For some modifications its useful to change already existing engine sensors to upgraded ones from the aftermarket or even other OEM parts.

The most common change is propably another MAF sensor so the ECU is capable of processing more airflow. But also an M50 manifold swap requires you to change the IAT sensor data because of the different charactaristic curve.

All temperature sensor voltage data (Volts -> °C) is listed together with the pullup resistor value for MS42 and MS43, keep that in mind when you want to use data from this site for standalone ECUs.

We try to find out sensor resistance data so that you can create your own voltage data for non factory ECU useage.

Mass Air Flow Sensors

Please keep in mind that you have to apply the MAF hack to your firmware binary when exceeding 1024kgh.

BMW M54B30 MS43 MAF Sensor

The connector and pinout is the same for all MS42 and MS43 MAF sensors.

Note: MS45 uses a different MAF sensor.

Pinout

• Plug: 12521427222 (BMW)
• Pins: 12521427612
• Cover: 12521707749

Pin 1	M_HFM (Sensor Ground)
Pin 2	A_HFM (MAF Signal Output)
Pin 3	U_HR (+12V Voltage Input)

Sensor Data

id_maf_tab__v_maf_1__v_maf_2 for copy and pasting

0.00	0.00	0.00	0.00	1.78	2.23	2.69	3.14	3.58	4.03	4.48	4.92	5.38	5.81	6.28	6.72
7.25	7.55	7.86	8.17	8.48	8.81	9.14	9.47	9.81	10.17	10.53	10.89	11.27	11.66	12.05	12.45
12.88	13.30	13.73	14.19	14.64	15.09	15.58	16.06	16.56	17.06	17.58	18.11	18.64	19.19	19.75	20.31
20.91	21.50	22.09	22.72	23.34	24.00	24.66	25.33	26.02	26.73	27.45	28.20	28.95	29.73	30.53	31.34
32.19	33.05	33.94	34.84	35.77	36.72	37.69	38.69	39.69	40.72	41.77	42.83	43.91	44.98	46.09	47.20
48.33	49.47	50.61	51.77	52.92	54.09	55.28	56.47	57.67	58.89	60.13	61.38	62.64	63.92	65.22	66.53
67.88	69.23	70.63	72.03	73.45	74.92	76.41	77.92	79.47	81.05	82.64	84.28	85.97	87.67	89.42	91.20
93.03	94.89	96.78	98.70	100.67	102.67	104.70	106.78	108.88	111.03	113.20	115.42	117.67	119.95	122.28	124.64
127.03	129.47	131.94	134.45	137.00	139.58	142.20	144.86	147.56	150.30	153.08	155.89	158.75	161.66	164.59	167.56
170.58	173.64	176.75	179.89	183.09	186.33	189.63	192.95	196.34	199.77	203.25	206.78	210.36	213.98	217.67	221.41
225.19	229.03	232.92	236.88	240.89	244.95	249.09	253.28	257.52	261.83	266.20	270.64	275.14	279.72	284.34	289.05
293.83	298.67	303.59	308.58	313.66	318.80	324.03	329.34	334.73	340.20	345.78	351.44	357.17	363.02	368.95	374.98
381.13	387.38	393.72	400.17	406.75	413.42	420.23	427.16	434.20	441.38	448.67	456.11	463.69	471.39	479.27	487.28
495.45	503.78	512.28	520.95	529.80	538.83	548.06	557.47	567.09	576.92	586.95	597.22	607.70	618.39	629.25	640.28
651.47	662.78	674.20	685.73	697.34	709.02	720.75	732.52	744.31	756.09	767.89	779.69	791.48	803.30	815.13	826.97
838.86	850.77	862.72	874.72	886.78	898.88	911.05	923.30	935.61	948.00	960.48	973.06	985.73	998.53	1011.42	1023.98

Audi S4 MAF Sensor (0280218038)

The Bosch 0280218038 MAF sensor is installed in the Audi S4 B5 series. Sometimes you will also find it even cheaper under the VAG replacement part number 078906461B.

The sensor itself is a Bosch HFM5 slot-in type and comes premounted in a 73mm inner diameter tube.

Pinout

• Matching Connector: 1J0973775A (VAG)
• 90° protective cap: 6X0971921C (VAG)

Pin 1	IAT Sensor Output
Pin 2	+12V Input Voltage
Pin 3	Common Ground
Pin 4	+5V Input Voltage
Pin 5	MAF Sensor Output

Sensor Data

id_maf_tab__v_maf_1__v_maf_2 for copy and pasting

0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
0.00	0.00	0.00	0.00	0.72	1.69	2.75	3.78	4.81	5.84	6.66	7.50	8.16	9.00	9.81	10.59
11.41	12.28	13.09	13.91	14.81	15.66	16.59	17.47	18.50	19.41	20.44	21.50	22.53	23.66	24.75	25.91
27.09	28.25	29.56	30.75	32.00	33.22	34.47	35.78	37.03	38.38	39.75	41.06	42.50	43.94	45.31	46.75
48.09	49.63	51.16	52.59	54.25	55.78	57.44	59.06	60.72	62.47	64.19	65.94	67.78	69.63	71.47	73.34
75.28	77.31	79.25	81.41	83.44	85.50	87.75	89.78	92.13	94.38	96.72	99.06	101.41	103.97	106.44	108.84
111.41	113.94	116.50	119.19	121.81	124.47	127.19	129.97	132.81	135.56	138.53	141.34	144.53	147.69	150.81	154.09
157.47	160.78	164.28	167.69	171.38	175.06	178.69	182.56	186.28	190.28	194.38	198.28	202.47	206.56	210.91	215.38
219.59	224.22	228.59	233.31	238.13	242.69	247.72	252.78	257.63	262.84	267.88	273.31	278.84	284.09	289.75	295.22
301.06	307.06	312.78	318.97	325.00	331.34	337.84	344.13	350.81	357.28	364.16	371.16	377.91	385.19	392.19	399.69
407.38	414.78	422.72	430.84	438.63	446.97	455.00	463.56	472.28	480.69	489.66	498.31	507.59	516.91	526.00	535.66
544.94	554.88	564.94	574.66	585.06	595.06	605.69	616.53	626.91	637.97	649.19	660.06	671.59	682.69	694.53	706.59
718.06	730.59	742.66	755.63	768.78	781.50	795.03	808.13	821.94	836.06	849.66	864.16	878.16	893.09	908.31	922.91
938.63	953.88	970.25	986.84	1002.97	1020.25	1037.75	1054.75	1072.97	1090.47	1109.41	1128.63	1147.22	1167.19	1186.44	1207.09

Audi RS4 MAF Sensor

The Bosch 0280218067 MAF sensor is one of the highest reading sensors used by OEMs. Sometimes you will also find it even cheaper under the replacement part number 0986280219.

The sensor itself is a slot-in type and comes premounted in a 83mm inner diameter tube. Matching connector can be found under VAG partnumber 1J0973775A.

Pinout

• Matching Connector: 1J0973775A (VAG)
• 90° protective cap: 6X0971921C (VAG)

Pin 1	IAT Sensor Output
Pin 2	+12V Input Voltage
Pin 3	Common Ground
Pin 4	+5V Input Voltage
Pin 5	MAF Sensor Output

Sensor Data

id_maf_tab__v_maf_1__v_maf_2 for copy and pasting

0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
0.000	0.000	0.000	0.000	1.560	3.130	4.750	6.220	7.410	8.440	9.500	10.590	11.590	12.690	13.750	14.840
15.970	17.060	18.190	19.340	20.500	21.720	22.970	24.130	25.340	26.560	27.840	29.190	30.500	31.940	33.280	34.720
36.250	37.720	39.250	40.780	42.410	44.060	45.660	47.250	48.810	50.440	52.160	53.810	55.660	57.500	59.340	61.380
63.220	65.340	67.410	69.530	71.690	73.810	76.160	78.590	80.940	83.410	85.810	88.470	91.130	93.660	96.340	98.970
101.810	104.690	107.410	110.250	113.220	116.160	119.130	122.030	125.190	128.280	131.310	134.560	137.690	140.970	144.530	147.940
151.720	155.310	159.220	163.220	167.000	171.190	175.190	179.590	184.000	188.280	192.780	197.280	202.000	206.810	211.470	216.500
221.630	226.470	231.720	236.780	242.130	247.530	252.910	258.530	264.000	269.840	275.810	281.660	287.780	293.750	300.190	306.690
313.000	319.690	326.130	333.060	340.060	346.880	354.060	361.560	368.690	376.280	383.690	391.560	399.590	407.310	415.530	423.530
432.060	440.690	449.190	458.250	467.000	476.410	485.940	495.220	505.090	514.630	524.780	535.190	545.190	555.910	566.310	577.410
588.720	599.630	611.280	623.160	634.590	646.840	658.560	671.090	683.810	696.060	709.130	721.750	735.470	749.470	762.940	777.340
791.380	806.280	821.410	836.000	851.590	866.530	882.500	898.720	914.280	931.000	948.310	964.940	982.590	999.690	1017.970	1036.590
1054.530	1073.660	1092.000	1111.630	1131.840	1151.340	1172.220	1192.310	1213.880	1235.780	1256.940	1279.530	1301.380	1324.690	1348.340	1371.160
1395.530	1419.030	1444.090	1469.560	1494.060	1520.250	1546.750	1572.340	1599.560	1625.810	1653.660	1682.000	1709.250	1738.220	1766.130	1795.810

HPX MH95B-2600

This data is untested, but calculated from the original 38-point scale HPX provides on their website.

Pinout

• Matching Connector: 1J0973775A (VAG)
• 90° protective cap: 6X0971921C (VAG)

Pin 1	IAT Sensor Output
Pin 2	+12V Input Voltage
Pin 3	Common Ground
Pin 4	+5V Input Voltage
Pin 5	MAF Sensor Output

Sensor Data

id_maf_tab__v_maf_1__v_maf_2 for copy and pasting

0.000	1.562	2.969	4.344	5.625	6.781	7.906	8.938	9.875	10.781	11.656	12.406	13.188	13.875	14.562	15.156
15.781	16.344	16.875	17.406	17.906	18.406	18.906	19.375	19.844	20.344	20.844	21.312	21.844	22.375	22.906	23.469
24.062	24.656	25.312	26.000	26.688	27.438	28.219	29.062	29.906	30.844	31.812	32.781	33.875	35.000	36.125	37.375
38.688	40.000	41.438	42.938	44.406	46.062	47.750	49.438	51.281	53.219	55.094	57.156	59.312	61.531	63.719	66.125
68.594	71.000	73.625	76.344	79.000	81.906	84.875	87.781	90.906	94.156	97.312	100.719	104.219	107.625	111.312	115.094
118.750	122.719	126.781	130.719	134.938	139.281	143.688	148.000	152.594	157.312	161.875	166.781	171.781	176.625	181.781	187.094
192.188	197.656	203.250	208.625	214.375	220.250	225.906	231.969	238.125	244.062	250.406	256.875	263.094	269.750	276.469	283.344
289.938	296.969	304.125	311.000	318.344	325.812	332.969	340.625	348.375	355.844	363.781	371.844	379.594	387.875	396.250	404.281
412.875	421.562	429.906	438.812	447.812	456.469	465.688	475.031	484.500	493.562	503.250	513.031	522.438	532.438	542.594	552.312
562.688	573.188	583.250	594.000	604.844	615.281	626.406	637.625	648.438	659.938	671.562	682.750	694.656	706.688	718.875	730.594
743.062	755.688	767.812	780.719	793.781	806.344	819.750	833.281	846.312	860.156	874.219	887.719	902.094	916.656	930.656	945.594
960.688	975.219	990.719	1006.406	1021.500	1037.594	1053.906	1070.406	1086.281	1103.250	1120.406	1136.938	1154.562	1172.406	1189.625	1207.969
1226.562	1244.469	1263.562	1282.938	1301.594	1321.500	1341.688	1361.156	1381.906	1402.969	1423.250	1444.906	1466.906	1488.094	1510.688	1533.656
1556.938	1579.406	1603.406	1627.750	1651.219	1676.281	1701.750	1726.281	1752.531	1779.156	1804.844	1832.312	1860.188	1887.062	1915.812	1945.031
1973.188	2003.281	2033.875	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969
2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969	2047.969

Manifold Air Pressure Sensors

Bosch MAP Sensor 20-300kPa (0261230119)

Tuner Pro Equation: kPa = X*0.32169117647-6.35

Sensor Data

Voltage	Pressure
0.40 V	20 kPa
4.65 V	300 kPa

Bosch TMAP Sensor 50-400kPa (0281006059)

Tuner Pro Equation: kPa = X*0.42724609375+6.25

Sensor Data

Voltage	Pressure
0.5 V	50 kPa
4.5 V	400 kPa

Alternative part number: 0281006060

Due to the relatively high minimum pressure measuring threashold, this sensor is maybe not suited to measure vacuum, but boost only.

Oil / Fluid Temperature Sensors

If you want to use different anolog sensors, it's important to know the ECUs internal electrical circuit diagram, since the sensor value differs when you calculate the sensor voltage with a wrong pull-up resistor.

The MS42/MS43s oil and coolant temperature is measured over a voltage divider with a 828 Ohm pull-up resistor to the internal +5V supply.

Temperature Sensors

If you want to use different anolog sensors, it's important to know the ECUs internal electrical circuit diagram, since the sensor value differs when you calculate the sensor voltage with a wrong pull-up resistor.

The MS42/MS43s intake air temperature is measured over a voltage divider with a 2.49kOhm pull-up resistor to the internal +5V supply.

BMW M50 IAT

The M50 IAT sensor uses the same thermister as the M50 ECT sensor, which is a bosch 0 280 130 026. Bosch ECT Sensor Data

The M50 has an 1.1k internal ohm pull-up resistor. The below table has been scaled for the MS43 2.49k internal pull-up and is ready for use as is.

V	°C
0.173	130
0.217	120
0.273	110
0.349	100
0.445	90
0.574	80
0.745	70
0.966	60
1.255	50
2.034	30
2.505	20
3.018	10
3.515	0
3.953	-10
4.306	-20
4.565	-30

BMW M52TU / M54 IAT

V	°C
0.215	142.5
0.274	129.8
0.469	110.3
0.606	99.8
0.782	90.0
1.017	80.3
1.310	69.8
1.662	60.0
2.092	50.3
3.089	30.0
4.008	9.8
4.341	0.0
4.595	-9.8
4.751	-20.3
4.927	-39.8
4.966	-48.0

BMW M54 IAT (MAF)

Applicable to the MAF sensor from MS45 vehicles (has an integrated IAT sensor).

V	°C
0.195	129.8
0.274	114.8
0.450	95.3
0.567	84.8
0.743	75.0
1.232	54.8
1.564	45.0
1.975	35.3
2.952	15.0
3.891	-5.3
4.243	-5.3
4.517	-15.0
4.517	-24.8
4.712	-35.3
4.771	-39.8
4.966	-48.0

Audi RS4 (B5) IAT (MAF)

Warning: Scale comes from RS4 binary and needs a 2.61kOhm pull-up resistor.

V	°C
0.156	140.3
0.234	120.0
0.273	110.3
0.352	99.8
0.449	90.0
0.566	80.3
0.723	69.8
0.938	60.0
1.191	50.3
1.504	39.8
2.109	24.8
2.793	9.8
3.242	0.0
3.633	-9.8
3.984	-20.3
4.395	-39.8

BMW B58 TMAP IAT

Applicable to B58 TMAP sensor (BMW part no. 13628637900) used with MS42 or MS43.

V	°C
0.117	142.5
0.176	129.8
0.274	110.3
0.352	99.8
0.450	90.0
0.567	80.3
0.743	69.8
0.958	60.0
1.251	50.3
2.033	30.0
3.031	9.8
3.519	0.0
3.950	-9.8
4.321	-20.3
4.732	-39.8
4.988	-48.0

HPX IAT (MAF)

Applicable to the HPX MAF sensors (has an integrated IAT sensor) and needs a 22kOhm pull-up resistor. used with MS42 or MS43.

V	°C
0.178	130
0.244	120
0.316	110
0.413	100
0.543	90
0.716	80
0.946	70
1.246	60
1.624	50
2.079	40
2.592	30
3.631	10
4.062	0
4.337	-10
4.594	-20
4.871	-40

BOSCH 4 BAR TMAP IAT

Applicable to Bosch 4 Bar TMAP sensor (part no. 0281006051) used with MS42 or MS43.

V	°C
0.173	130
0.217	120
0.274	100
0.446	90
0.573	80
0.744	70
0.965	60
1.254	50
2.033	30
2.505	20
3.018	10
3.515	0.0
3.952	-10
4.306	-20
4.565	-30
4.740	-40