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SMT6 Developers Manual - Map Deflection Signals


Perfect Power Online Manuals.


Support for your SMT6 Unit.


The SMT6 has 3 maps (screens). The maps contain settings (sites). A cursor indicates which map point is accessed during engine operation. In order to "move" the cursor, the SMT6 has various DEFLECTION inputs. If a map is not used, then the deflection input can be left open. However, the map values must be set to the "OFF" or "NON-ACTIVE" values as indicated below.


Analog Deflection Input : BROWN pin 7
RPM Deflection (and ignition) : YELLOW pin 8
Engine Temperature Input : GREEN/YELLOW pin 11
Manifold Pressure (AMP) Input : BLACK / WHITE pin 10





The signal input range is from 0 to +5 Volts. The map deflection can be "calibrated" to respond to any portion of the input range. See : DOS or Windows Manuals. The analog deflection is normally connected  to the throttle or the manifold pressure sensor. It can be connected to an ANALOG airflow meter, which gives a DC voltage out proportional to the airflow. Important is that the analog deflection input somehow shows the engine "loading". If the analog deflection is not used, then it should be connected to ground.





This input serves also as the IG1IN (Ignition #1 input). It must be connected to a signal, which normally repeats every 360 degrees, or every 720 degrees in special circumstances.


The pickup level can be specified in the global screen :


LOW LEVL. IN : Y 0..1 Volts
LOW LEVL. IN : - 2.5 Volts



The input polarity can be specified :


POS.IN.POL : Y triggers on positive edge
POS.IN.POL : - triggers on negative edge


The way the SMT6 interprets the signal is set in the OPERATING MODE :


  10-30 NORMAL (non-missing tooth)


Other settings influence the RPM Deflection :


  • Cylinders
  • Teeth per rev
  • Teeth per fire

If every item is set correctly, then the SMT6 displays a CORRECT and STABLE RPM. The correctness is of minor importance, the stability is VITAL.


The RPM range can be set (calibrated) to span the desired tuning range of 300 to 10 000
RPM for non-missing tooth and 600 to 10 000 RPM for missing tooth applications.

The lowest RPM position is not useable. Instead the input is copied to the output to overcome starting problems.





The green/yellow wire can sense any NTC sensor, and it can be calibrated to show the correct temperature. The values in the A_ENGT map are multiplied with the  ANALOG map and then applied to the input signal. If the A_ENGT map is not required, then all entries should be set to 1.00.


The A_ENGT map changes the EFFECTIVENESS of the ANALOG map values. Thus the analog map can come in to effect with warm or cold engine temperature. The input can be connected to an AIR TEMPERATURE SENSOR.


As a matter of principle, the input can be connected to any analog signal in the range from 0-5 Volts. It can be calibrated in to any "display" as long as the reading stays in the 3 digit range.





The black/white wire can sense any input signal in the range from 0-5 Volts.
This input signal affects the :




If the signal is not needed, then values in the respective maps must be set as follows :


  • F_AMP  (Injection)  1.00
  • I_AMP (Ignition)  0


The input can be connected to any other signal source, as long as the 0-5 Volts range is met, and the signal presents the engine load. We do not recommend that a  potentiometer be used for manually changing the ignition or injection while driving.