7.8 Advanced Engine 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
You can use the Project Properties screen to set the units, both mph vs kph and meters vs inches, in the
Settings tab under Project Properties, or you can change them with the settings in the lower corner of this table.
There are four options for speed input.
1. Analogue linear input where 0V = zero speed and 5V = max speed.
2. Digital pulse input to MS3Pro
3. MS3Pro collects speed value from remote CAN device
4. MS3Pro collects pulse data from remote CAN device
7.8.1.1 Analogue linear input A 0-5V signal is applied to one of the analogue inputs. Some aftermarket
speedometers have an analog output that can be used for this purpose. This can also apply to Pitot tube type
speed indicators. Set the analogue sensor input channel, the full scale speed, and the smoothing lag factor.
7.8.1.2 Digital pulse input to MS3Pro This is most easily achieved with a hall-type sensor applied to one of
the frequency or switched digital inputs. Analogue sensor should be set to Off and the 0-5V input pin specified as
the Input. Set wheel diameter, VSS position, number of teeth and lag factor. There are many options for mounting
a reluctor and sensor on the vehicle; two basic categories exist - wheel mounted and driveline mounted.
Wheel mounted Select this when your sensor is picking up on a shaft spinning at the same speed as the
wheels. Possibly the simplest option here is a gear tooth sensor (such as the Honeywell 1GT101DC) in close
proximity to the back of the wheel studs, or a pre-existing ABS reluctor.
Driveline mounted Select this when your sensor is picking up on a shaft before the final drive gear. e.g.
gearbox output shaft, driveshaft. (This is most likely the setting to use for RWD transmission mounted sensors.)
Many transmissions already offer a VSS output. If this is suitable, you may be able to just tap into this. Alternatively,
you could add a magnet on the output flange and a hall sensor.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 229
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