SMT8-FT TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8-FT Unit.

CONNECTIONS

The SMT8-FT has a 12 pin auxiliary connector and an 8 pin connector for every 2 cylinders.

 

 

PIN-OUT TABLE

 

SMT8-FT - Pin-Outs and Connections

 

SMT8-FT MAIN CONNECTOR (12 PIN CONNECTOR)

 

Pin Signal Description
1 GROUND Chassis
2 +13V Switched Battery Positive
3 MAPSW Map Switching, Open=Map A
4 AIN Analog/AFR Input
5 -CROUT Negative CRANK timing signal output
6 CRANK Crank signal input
7 PCTX Input to the unit, RS232
8 PCRX Output from the unit, RS232
9 TEMPIN Engine Temperature Input
10 AOUT Analog/AFR output
11 AMPIN AMP map deflection input
12 +CROUT Positive Crank timing signal output

 

 

SPECIFICATIONS

 

Power Consumption
~ 100 mA (0.1A)

Power Supply Voltage
8 - 36V

Reverse Polarity Protection
Yes

Momentary Power Supply
Up to 40V, 5ms

Signal Input Impedance
> 10K Ohm

Ignition Output Pull Up
2K2 Ohm

Ambient Temperature
Up to 60 deg Celsius (Passenger Compartment)

Injector Drive
3 Amp, 13-Ohm Injector

Analog output drive 2x
0.005 Amp (5mA), 0-5 Volts

Analog Input Range
0 - 5 Volts

 

 

PARAMETERS

SMT8-FT - ShiftF1 - Parameters

 

CYLINDERS
The cylinder entry is only necessary when the unit has to calculate the RPM from the injection signal

 

IGN ADV LIMIT
This is the maximum total advance the unit will allow for modification. It must be a positive entry.

 

IGN RET LIMIT
This is the maximum total retard the unit will allow for modification. It can be positive or negative entry.

 

START SECONDS
The amount of seconds that the unit will wait before beginning any modifications.

 

ANALOG1 ZERO
This entry off sets the analog output voltage if it is found that the entire fueling range is too rich or too lean.

 

ANALOG1 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.

 

ANALOG1 LOWER LIMIT
The minimum output voltage is zero volts. Any other setting prevents the output from falling below the set limit.

 

IGNITION WINDOW
This allows the SMT8-FT to be less sensitive to the incoming ignition/crank signal. A value of -1 will disable the SMT8-FT'S error checking of the incoming signal. Typical values of 1 to 10 are normal.