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SMT-FTX Technical Manual - Tuning Fuel via an Extra Injector

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

TUNING FUEL VIA AN EXTRA INJECTOR

Purpose:
It is sometimes required to help the OEM injector in the fuel delivery. This is specifically required when:

 

Ethanol E85 is used: Requires 30% more fuel
The power is increased: Requires proportional fuel increase

 

The SMT_FTX has an AUXILIARY injector activation circuit which can be activated in two ways: Normal mapping via TPS/RPM, AMP and Engine temperature. In this mode you inject what you see. The auxiliary injector is activated at every OEM injection.

 

This auxiliary injector can also be used for staging to the OEM injection. The staging point is set in the parameters and the TPS/RPM map is active. This allows injection when the OEM injectors run out of time. The auxiliary injector size can be set in the parameters as a multiplier.

 

One Auxiliary injector driver for a 12 Ohm injector can be activated via one of the Set-Point outputs. The selected output is activated on EVERY OEM Injection.

 

 

STAGED

 

The Auxiliary injector can be operated in two ways:
STAGED to the OEM injection  Select SYSTEM DEF, AUX Stage

En=ON  

The staging point and the staging 'slope' can be selected by:

  • PARAMETERS, AUX Stage point  Entry in percent
  • PARAMETERS, AUX Stage Mult.   

 

At the point where the OEM injection EXCEEDS the Stage point the AUXILIARY
Injection starts:

 

AUX INJECT    =  AUX INJECT MAP
 x    (OEM injection – Stage point)
 x    Stage multiplier

 

STAGE USAGE:
If the OEM injectors (Display: ECU Inj Utilization) top out at full throttle then the fuel can be supplemented by an extra injector in the manifold. The flow-rate of the extra injector can be adjusted by the Stage Multpl.


NOTE: a large injector requires a low multiplier!

 

 

NORMAL

 

The Auxiliary injector can be operated in two ways:

MAPPED  Select SYSTEM DEF, AUX Stage
En=OFF
 

The injector is activated on every OEM injection by the length specified in:

AUX INJECT    =  AUX INJECT MAP
 +    Eng. Temp Map
 x    AMP map


ASSOCIATED PINS

SP1 pin 7/14 Set Point output #1
SP2 pin 14/14 Set Point output #2