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SMT-FTX Technical Manual - Obtaining RPM and Calibrating It

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

OBTAINING RPM AND CALIBRATING IT

RPM is not required for LIMITING a signal via a parameter. This simple operation would not justify this unit, so it is ignored.

 

 

RPM FROM OEM INJECTORS

 

That is the simple and easy way. Requirement: Connect the SMT-FTX injector harness #1 to any cylinder and load the default map (CONFIG, Load DEFAULT).
This sets the OEM injection modification maps to zero (do nothing).

Tick:    SYSTEM DEF, RPM from Inject=ON

It is possible that your engine has ‘BATCH INJECTION’ or that it is a two stroke engine.

Tick:    SYSTEM DEF, Two Stroke

 

 

RPM FROM CRANK TRIGGER

 

The SMT-FTX derives the RPM reading from the CRANK signal input (pin6/14) when:

System definition, Rpm from Inject=off

The CRANK trigger input requires a single connection:

SMT-FTX Fuel Tuner - Tee onto Crank Signal

FIGURE 2 Teed onto Crank signal

 

Description      
Pin Input Pin Output
       
A) CRANK SIGNAL:      
+ 10 +CB1 6 CROUT

 

 

A pull-up resistor can be specified in the System Definition, Crank Pull-up

 
This is required for hall sensors. The Crank Pull up when activated will supply a 5 volt pull up. The following drawing explains a hall sensor wiring:

 

 

FIGURE 3 CRANK PULL-UP WIRING

SMT-FTX Fuel Tuner - Crank Pull-Up Wiring

SMT-FTX Fuel Tuner - ShiftF2 - System Definition

The type of trigger signal used is set up via the parameter screen.

 

Parameter:

 

  • TEETH PER TURN (INCLUDING MISSING)
  • EDGES PER TURN

 

The edges per turn tell the unit how to calculate RPM. The Teeth per turn are needed to specify the crank degrees per teeth.

 

 

RPM CALIBRATION

 

The RPM SCALE can be calibrated by a

NONLINEAR
CUSTOM
LINEAR

Process: The following picture explains this!

 

SMT-FTX Fuel Tuner - RPM Calibration