AMP EFI MS3Pro - Shaft Speed Sensors; EGT; Thermocouple Settings

7.8 Advanced Engine 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.8.2 Shaft Speed Sensors
These use digital pulsed inputs to determine speed of other components in the car for data logging. For exam-
ple, you can log the converter output shaft speed in an automatic transmission. Currently, shaft speeds are just
recorded and displayed, but not used for any other calculations.
High speed input mode allows more precision, but is not available on all inputs. If it is available on your input, it
is best to turn this on.
This mode allows fractional teeth in case the sensor is driven by a gear or other mechanism that results in a
non-integer number of outputs per shaft revolution.
7.8.3 EGT / Thermocouple settings
The EGT system in MS3Pro allows inputs from EGT sensors to be datalogged by serial or SD card. It optionally
allows the engine to be shut down if EGT exceeds a set temperature. If an EGT probe is fitted to each exhaust
port, it can be used in conjunction with per-cylinder fuel trim to balance cylinders to account for air flow and injector
flow differences. EGT is used extensively in piston driven aircraft and much useful information can be found from
aircraft literature and then applied to your non-aero engine. (EGT differences between cylinders can be significant
at idle. Evidence shows that V8s often run cold on the four corner cylinders and hot on the inner four. One engine
required over 10% fuel trim to balance these air-flow differences.)
To use the EGT system an EGT probe (usually a K-type thermocouple) is installed in the exhaust manifold.
When installing an EGT per cylinder, it is typical to install ~50mm from the head.
The thermocouple output is a small voltage that the MS3Pro will not read directly. There are two ways you can
connect a thermocouple to the MS3Pro:
• An amplified that converts the signal to a 0-5 volt reading which you can connect to an MS3Pro analog input
• A CAN enabled thermocouple interface like the CAN-EGT input module that transmits the data over the CAN
bus
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 231