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SMT-FTX Technical Manual - Retarding/Advancing Ignition

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

RETARDING/ADVANCING IGNITION

Ignition tuning is a little tricky and should only be attempted with great care. Nothing can be gained from tuning modern engines, unless special circumstances prevail or once the engine was modified.

 

 

PURPOSE

 

The ignition angle of an engine can be modified (retarded or advanced) to achieve one of the following effects:

 

  • More power with high quality fuel (advance).
  • Avoid detonation after a turbo (Supercharger) installation (retard)
  • Retarding for poor quality fuel.

 

There are numerous other applications, which require better ignition angle control. Ignition control is not successful on engines with active knock sensor control.

 

 

ASSOCIATED PINS

CRIN Pin 6 of 14
CROUT Pin 10 of 14

 

SMT-FTX Fuel Tuner - Crank Wiring

FIGURE 7 CRANK WIRING

SMT-FTX Fuel Tuner - F5 - Ignition Map

SMT-FTX Fuel Tuner - ShiftF1 - Parameters

 

THE IGNITION CIRCUIT IS SAFE GUARDED BY PARAMETERS AS FOLLOWS :

 

 

MAX ADVANCE/RETARD LIMIT

This is the maximum total advance the unit will allow for modification. It must be a positive entry.     See: CONFIG, PARAMETERS, Ign Adv Limit
See: CONFIG, PARAMETERS, Ign Ret Limit

 


START SECONDS
This is the time in seconds after starting the SMT_FTX waits before it will modify the ignition signal.

 


MAPPING
The Ignition signal can be mapped within the specified (above) limits by:

 


MAIN (RPM / THROTTLE) MAP
For RPM: See 7.0 Obtaining RPM and calibrating it
For TPS See:    8.0 Obtaining MAP deflection and calibrating it

 

Enter a number in the range from the max retard limit to max advance limit on the main map. Zero, will do no modification to the signal! Positive numbers ADVANCE!

 


OPTIONAL AMP MAP
For AMP See: 9.0 CONNECTING AMP and CALIBRATING IT

 

The active value will be added to the value on the main map, for no modification place a zero on this map.

 


OPTIONAL ENGINE TEMPERATURE MAP
The active value is added to the other values to form the overall IGNITION modification.

 


IGNITION SETUP AND INDICATIONS
STATUS, CRANK ACTIVE
This indicates that the SMT-FTX sees an input on the CRIN, pin 6/14

 

If the RPM indication (Set SYSTEM DEF: RPM FROM INJECTION=OFF) is unstable or has the wrong value then the system parameters must be set.

 

SMT-FTX Fuel Tuner - ShiftF9 - System Setup

Picture above shows correct settings for a 36-1 crank signal.

Picture below shows the incorrect settings for the 36-1 crank signal.

SMT-FTX Fuel Tuner - ShiftF9 - System Setup

Edges per turn: The unit counts the 'EDGES' as per set-up and declares it ONE CRANK TURN.

Teeth per Turn: The unit computes the crank degrees per tooth from it. In the above setting there are 10 degrees per tooth. From this the unit computes 1 degree, which is a measurement in the maps.