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SMT8_4 Technical Manual - IGN (Ignition) Map

SMT8_4 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8 V4 Unit.

IGN (IGNITION) MAP

 

 

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
(On 12 Pin Connector)

 

  Input Pin Output Pin  
  - +    
CRANK : 1 2 8 OF 12 5 OF 10
CAM #1 :   3 9  
CAM #2 :   4 10  

 

SMT8V4 Piggy-Back Unit - F4 - Crank and CAM Wiring

 

MAX ADVANCE LIMIT

 

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

 

 

MAX RETARD LIMIT

 

This is the maximum total retard the unit will allow for modification. It can be positive or negative entry. See: CONFIG, PARAMETERS

 

 

MAPPING

 

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

 

 

MAIN (RPM/THROTTLE) MAP

 

For the RPM to work: Connect CRANK signal


For the Throttle to work: Connect pin 13 of the 16-pin connector to the analog deflection signal (normally the throttle position sensor).


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!

 

 

OPTIONAL AMP MAP

 

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


The MAP deflection comes from the AMP (IN) pin 3 of the 16-pin connector.

 

 

OPTIONAL AIR TEMPERATURE MAP

 

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


The air temperature deflection comes from AIRT (IN) pin 12 of the 16-pin connector.

 

 

OPTIONAL ENGINE TEMPERATURE MAP

 

The active value is added to the other values to form the overall IGNITION modification.


The Engine Temperature input comes from pin 4 of the 16-pin connector.

 

SMT8V4 Piggy-Back Unit - F2 - Ignition Map

 

PARAMETERS

 

MAX ADVANCE LIMIT
This restricts the maximum overall ADVANCE from the neutral point.


MAX RETARD LIMIT
This restricts the maximum overall RETARD from the neutral point.


START SECONDS
This is the time in seconds after starting the SMT8_4 waits before it will modify the ignition signal.


IGNITION WINDOW
This allows the SMT8_4 to be less sensitive to the incoming ignition/crank signal. A value of –1 will disable the SMT8_4’s error checking of the incoming signal. Typical values of 1 to 10 are normal.

SMT8V4 Piggy-Back Unit - ShiftF1 - Parameters

 

IGNITION SETUP

 

STATUS, CRANK ACTIVE
This indicates that the SMT8_4 sees an input on the Crank +, pin 2/12


STATUS, IGN. DETECT FAULT
This indicates that the SMT8_4 cannot decode the crank signal and will retard only.


The two special SYSTEM PARAMETERS:

 

  • Teeth per turn
  • Edges per turn


Must be set correctly. If they are set correctly and the RETARD ONLY indication persists then this means that the SMT8_4 is unable to work with this crank signal.


If the engine runs with it, then you have to be content to have the ability to retard the timing. If the engine does not run, then the level may be too low.

SMT8V4 Piggy-Back Unit - ShiftF9 - System Setup

Picture above shows correct settings for a 60 – 2 crank signal.

SMT8V4 Piggy-Back Unit - ShiftF9 - System Setup

SMT8V4 Piggy-Back Unit - ShiftF3 - Status

Picture above shows the incorrect settings for the 60–2 crank signal as can be seen by the highlighted ‘Ign.Detect Fault’


To setup the ignition, the edges per turn must first be set until the SMT8_4 displays the correct RPM. The “teeth per turn” is setup last and when the number is correct the IGN DETECT FAULT will be grayed out. Correct settings for a 60 – 2 crank signals are: Teeth per turn 60 and Edges per turn 58.