SMT8_4 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8 V4 Unit.

FEATURES

Here is a brief list of the features:

 

2 maps to influence analog signals:

ANA1 MAP

ANA2 MAP

1 Map to influence up to THREE ignition signals IGN MAP…..
2 Extra injector maps to drive two injectors

INJ MAP #1

INJ MAP #2

1 Set point control with up to 3 outputs (relays) SETPOINT
1 Frequency modification map FREQ
1 AFR (Lambda) modification map wide/narrow? AFR
1 BOOST control screen BOOST
Calibration of all inputs:

Engine temperature

Air temperature

AMP (MAP) sensor

Throttle position

RPM

Engine Protection Via

Ignition cut

Ignition retard

ETC control

USB or WIRELESS Communication  

 

 

ANALOG #1 MAP

 

An analog signal is intercepted via the A1 (IN) (pin 9/16) to A1 (OUT) (pin 2/10) connections. It is mapped via Throttle/RPM, Engine temperature, Air temperature and AMP, for the purpose of altering fuel at specific engine conditions. The output signal can be limited (high and low).

 

 

ANALOG #2 MAP

 

The analog signal on A2 (IN) (pin 11/16) is mapped to the A2 (OUT) (pin 4/10) via Throttle/RPM, AMP, Air and Engine temperature, for the purpose of altering (mapping) an analog signal, which in turn may alter certain engine operations. The output signal can be limited (high and low).

 

 

IGN MAP

 

The analog signal on A2 (IN) (pin 11/16) is mapped to the A2 (OUT) (pin 4/10) via Throttle/RPM, AMP, Air and Engine temperature, for the purpose of altering (mapping) an analog signal, which in turn may alter certain engine operations. The output signal can be limited (high and low).

 

 

INJECTION MAP #1

 

The SMT8_4 can drive one extra injector (13 ohm) for supplementing fuel at high boost. The extra injector can be controlled via Throttle/RPM, AMP, Engine and Air temperature maps. This allows for precise fuel delivery at boost conditions. This feature is very popular with turbo and supercharger installations. The Injector #1 output is assigned via the SET-POINT map.

 

 

INJECTION MAP #2

 

The Second Injection map with full tuning capability is designed to operate on INJECTOR #2 via the SET-POINT procedure. The map can be used for very complex fueling strategies in conjunction with injection map #1, or it can be ignored. A 13-ohm injector must be used. The Injector #2 output is assigned via the SET-POINT map.

 

 

SETPOINT

 

The SMT8_4 has 3 set point (relay) drive outputs, which can be activated from 14 different signal sources. This is for the implementation of, for example, fan control, gearshift lights, idle assistance and all other small jobs around the engine and cockpit. All functions can be combined in a logical fashion, and full polarity (higher than/lower than) selection is possible. Furthermore, The SETPOINT procedure can be used to switch between the TWO operating maps A/B. The SET-POINT outputs are SHARED with the injection outputs.

 

 

WIDE BAND AFR MODIFICATION

 

Two wide band LSU-4 channels can be tuned simultaneously. A large 16 x 24 map allows for the precise AFR (Lambda) signal modification via the WAFR1IN (pin 7/16) and WAFR2IN (pin 5/12) to the WB1OUT (pin 10/10) and WB2OUT (pin 9/10). The AFR is mapped via Throttle/RPM, AMP and Engine temperature.

 

 

NARROW BAND AFR MODIFICATION

 

Two narrow band AFR probes can be tuned simultaneously. A large 16 x 24 map allows for the precise AFR (Lambda) signal modification via the NAFR1IN (pin 5/16) and NAFR2IN (pin 11/12) to the NAFR1OUT (pin 14/16) and NAFR2OUT (pin 15/16). The AFR is mapped via Throttle/RPM, AMP and Engine temperature.

 

 

WIDE BAND AFR DISPLAY

 

One wide band LSU-4 probe can be monitored, and the engines operating AFR (Lambda) can be displayed by connecting WRCAL (pin 6/16) to the calibration resistor of the probe.

 

 

FREQUENCY/PWM MODIFICATION

 

A digital signal (PWM or FREQUENCY) can be modified via the FREQ (IN) (pin 2/16) and the FREQ (OUT) (pin 3/10) signal path. The mapping is via RPM/TPS, AMP, Engine and Air temperature.

 

 

BOOST CONTROL

 

The SMT8_4 can pulse a solenoid to raise the boost above the waste gate canister default pressure. The boost is mapped via low TPS/RPM, high TPS/RPM, Air temp/RPM and Boost target/RPM.

 

 

ALTITUDE COMPENSATION

 

The unit can perform altitude compensation by connecting an external manifold pressure sensor to the analog #3 input and enabling the process via the system definition.

 

 

MAP A/B

 

The SMT8_4 has two complete maps. That is to say that you can switch between two different tuned maps while driving. It is possible to have one map for fuel-economy, and the other for performance. Or use the maps for different weather conditions. The Maps can be switched automatically from the SETPOINT procedure, or from the hardware input (Switch). The parameters and calibration are not switched. The maps can be ‘locked’ in to a fixed position from the PC for tuning and downloading. When the map switching is enabled in the Set points the hard switching (pin 10/16) will no longer function

 

 

CALIBRATION

 

The Throttle, RPM range, AMP sensor, Air temperature and Engine temperature sensor and scales can be calibrated and specified. The Calibration is applicable to both tune maps A/B.

 

 

WIDE BAND SENSOR CALIBRATION

 

Each of the wide band outputs has separate offset calibration, and the wide band display channel has an input offset calibration facility.

 

 

DISPLAY

 

The SMT8_4 has an external display feature, which is set up by the PC. Up to 8 displays can be driven, showing 8 selectable engine measurements.

 

 

HELP

 

Help is available in various forms:

 

  • Right click on any item and a short explanation is available
  • This TECHNICAL MANUAL
  • The LETRIPP SOFTWARE USER GUIDE
  • Some WINDOWS ITEMS are explained ‘ONLINE’