7.8 Advanced Engine 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.8.4.4 0V, 5V value These are only used with the Linear transformation.
• 0V value - specifies the number you want to see when 0V is applied
• 5V value - specifies the number you want to see when 5V is applied
Many sensors specify output at other voltages, e.g. some data sheets advise pressure at 0.5V and 4.5V. This
needs to be converted to the 0V and 5V values using a calculator.
Take the following numbers:
“A” = low voltage
“B” = high voltage
“C” = low pressure
“D” = high pressure
Calculate E = (D - C) / (B - A)
0V value = C - (E * A)
5V value = (E * 5) + 0V value
Let’s work these out with an example sensor: Honeywell’s 2000 psi sensor, part number MLH02KPSB06A.
This sensor has a linear (ratiometric) output voltage range of 0.5V to 4.5V from zero to full pressure. It is a
2000psi gauge sensor that would be suitable for measuring nitrous line pressure 0.5V is 0psi 4.5V is 2000psi
Calculate the 0V and 5V values as above. Take A = 0.5V, B = 4.5V, C = 0psi, D = 2000psi
E = (D - C) / (B - A) = (2000 - 0) / (4.5 - 0.5) = 2000 / 4 = 500
0V value = C - (E * A) = 0 - (500 * 0.5) = 0 - 250 = -250 (yes, this is negative) 5V value = (E * 5) + 0V value =
(500 * 5) - 250 = 2500 - 250 = 2250
For this particular sensor, you would enter -250 in the 0V box and 2250 in the 5V box. Those values are never
actually reached, but this gives the correct calibration.
7.8.4.5 Lag The smoothing factor to apply. This uses the same number system as lags elsewhere. 100%
means no smoothing and lower numbers give increased smoothing and lag to the input. 15% is a sensible lower
limit.
7.8.4.6 CLT/MAT temp units Specify the temperature unit system you want.
7.8.4.7 Allow Input Sharing Normally each input can only be used by one feature. This setting allows inputs to
be shared between generic sensors and other features. (Obviously you can still only connect one sensor to each
input!) For example, you may want to enable a sensor as an EGT input, but also have TunerStudio display the raw
voltage from the sensor.
7.8.5 Accelerometer parameters
The accelerometer input allows for a user-supplied one, two or three axis accelerometer to be connected to the
MS3Pro and datalogged. It may be connected to any of the spare analogue inputs or remotely via a CAN.
The accelerometer is calibration to +/-1g for convenience, but internally the code uses SI measurement units
(m per second squared) so accelerometer acceleration can be compared to vss measured acceleration.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 234
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