LMA-3 AuxBox Multi-Sensor Device
Five additional engine metrics can be logged and analyzed by connecting the LMA-3 to the LM-1's auxiliary input: RPM (using a tach signal or inductive clamp); EGT (exhaust gas temp) or CHT (cylinder head temp); injector duty cycle (dwell); MAP (manifold air pressure) or boost; and acceleration. The temperature measurement circuit has a K-type thermocouple; the MAP sensor is a three-bar absolute pressure sensor that provides accurate data up to 44.1 psia; and the internal accelerometer features two axis measurements. The LMA-3 converts the LM-1 to a complete tuning diagnostic. For example, correlating AFR, RPM, CHT, and MAP is vital when tuning piggyback fuel controllers, ECU programmers, aftermarket ECUs, or racing carburetors. Unlike a dyno, the LMA-3 can provide actual road test data, and it accommodates five external inputs to attach external sensors, such as TPS and suspension.