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SMT6 Developers Manual - Missing Tooth Applications

SMT6 DEVELOPERS MANUAL

Perfect Power Online Manuals.

 

Support for your SMT6 Unit.

MISSING TOOTH APPLICATIONS

This operation is specified with MODE = 1

 

  INPUT : IG1IN YELLOW PIN 8
  OUTPUT : IG1OUT WHITE PIN 20
SECONDARY OUTPUT : IG2OUT WHITE/BLUE PIN 17
BIPOLAR OUTPUT : IG1SP PINK PIN 19

 

The IG1IN signal serves as a map deflection input, and requires that the signal repeats every engine turn. This is normally the case with crankshaft triggers. Consult the factory if you have a missing tooth CAM trigger, which repeats every two turns.

 

The output has the same characteristics as the input signal, but it is a 12V square wave.


The input/ output is affected by :

  • Ign Input Polarity
  • Ign Output Polarity
  • Bipolar (Magn.) inp.
  • One Missing Tooth
  • Teeth Per Turn
  • Teeth Per Firing

 


At RPM position zero (bottom map row) the output signal is copied from the input  to the output and timing is applied (regardless of your map entry!) This is particularly convenient for starting the engine, and for "first time" testing.

 

Set the bottom RPM scale to 3000 RPM (RS 3000), and try to start the engine. Change polarity and trigger level until the engine runs smoothly. You may "tee" in the IG1IN signal first, and then monitor the output IG1OUT for matching the input.

 

Depending on what signal your ECU requires, you may try the alternative output :

Bipolar OUTPUT : IG1SP PINK PIN 19

 

This IG1SP signal swings from -8 Volts to +8 Volts.

 

The second output is IG2OUT. It is an INVERSION of the IG1OUT signal. Some ECU's with "balanced" inputs require two "opposing" input signals to trigger.

 

The following picture shows a good input trigger signal, with the output shown without any timing applied. The output can be retarded and advanced by up to two teeth (minus one degree). The output contains one or two missing teeth as specified, regardless of the input signal.

 

SMT6 - Missing Tooth Applications

Wiring for "Balanced" Output :

 

SMT6 - Wiring for Balanced Output

 

Note : The Injector drive is not available when using a balanced input. The green wire (pin 9) is shared with injector drive, and the high injector current may interfere with the input signal.