SMT8_4 TECHNICAL MANUAL

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Support for your SMT8 V4 Unit.

ANALOG #1 MODIFICATION

The SMT8_4 analogue #1 feature can modify one analog signal, namely AN1IN and output the mapped signal on A1OUT.

 

SMT8V4 Piggy-Back Unit - Analog #1 Wiring

 

SMT8V4 Piggy-Back Unit - F3 - Analog #1 Map

 

USAGE

 

An analog signal is a DC voltage generated from a number of different types of sensors; examples of these are the air flow meter, mass air flow meter (MAF) and pressure transducer (MAP) or temperature transducer.


Most analog signals, with a few exceptions, range from 0 to 5 Volts and are used by the ECU to determine the fuel quantity. By routing the signal through the SMT8_4 the analog voltage is changed, which in turn results in a fuel change. Thus, allowing the car to be tuned. The input to output voltage relationship can be changed at various engine-operating points. This process is called “MAPPING”.

 

 

ASSOCIATED PINS

 

ANALOG 1 input Pin 9 of the 16-pin connector
ANALOG 1 output Pin 2 of the 10-pin connector

 

 

REQUIREMENTS

 

ANALOG #1 lower limit (Volts):
This voltage setting prohibits the analog output to go BELOW the limit.

 

ANALOG #1 high limit (Volts):
This voltage setting prohibits the analog output to go ABOVE the limit

 

 

MAIN (RPM/THROTTLE) MAP

 

For the RPM to work: Connect CRANK (see: RPM trigger).


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


All map entries are in counts (without a decimal point) 100 counts entry equals 1.00 Volts.

 

 

COMPLETE CALCULATION

 

A1OUT =
 
AN1IN
 +-ANA1 MAP
 +- AN1 ENGT
 +- AN1 AIRT
 X AN1 AMP

 

 

The A1OUT signal is limited to the low and high limits.

Note: The AMP map is a multiplier so when it is not used set all the values to 1.0

 

 

PARAMETERS

SMT8V4 Piggy-Back Unit - ShiftF1 - Parameters

An1 UPPER LIMIT:
Entering 5 volts, which is the max output voltage, renders the limit useless.
Any other entry prevents the output to exceed the set limit.

 

An1 LOWER LIMIT:
The minimum output voltage is zero volts. Any other setting prevents the output
from falling below the set limit.

 

Analog#1 +-%:
This value entered in percentage is a voltage offset