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SMT-FTX Technical Manual - Controlling Turbo Boost

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

CONTROLLING TURBO BOOST

The Boost control is for aftermarket turbo installations. It controls a 'bleed' solenoid, which in turn controls the waste gate. Simple but effective! The purpose is to restrict the boost at low RPM to prevent 'knocking' and increase the boost at high RPM where the airflow rate is restricted.

 

For Turbo waste gate control YES
PWM bleed Air temp. map sites 24
PWM sites for cruising 24
PWM sites for full power 24
Target boost map sites 24
PID loop gain YES

 

BOOST CONTROL

 

The SMT-FTX has a boost control feature, which can be used to IMPLEMENT a boost control loop after adding a turbo.

 

This does NOT MODIFY and existing boost control loop, but constructs a new one. The manifold pressure is measured via the AMPIN (pin 11 of 20) and compared to a target map. Depending on the difference to the target boost pressure the output PWM to the bleeder solenoid is modified so that the waste gate is closed/opened to achieve the target pressure.

 

 

PURPOSE

 

It is often desirable to add a turbo to an engine without DE-COMPRESSING the engine. In this application precise boost control is required at lower RPM to avoid knocking, but higher boost pressures can be used at high RPM.

The boost control is achieved via a “BLEEDER” valve, which controls the effective canister pressure, and thus operates the waste gate. The signal to the bleeder valve is PWM.

 

 

BOOST CONTROL MAPS AND PARAMETERS

SMT-FTX Fuel Tuner - F7 - Boost Control

BOOST TARGET MAP
Entry is in pressure (bar/lbs). For each RPM point a different boost target can be specified.

 

BOOST PWM LOW
This is the PWM BASE duty cycle in percent for low TPS settings.

 

BOOST PWM HIGH
This is the PWM BASE duty cycle in percent for HIGH TPS settings.

 

BOOST GAIN (PARAMETER)
This is a multiplier (0.01 to 9.99) by which the target to manifold difference is multiplied with before adding the result to the BASE PWM. If the actual manifold pressure differs too much from the target then the gain is too low. If the loop ‘oscillates’ then the gain is too high. The gain depends on the bleeder valve construction, the size of the waste gate canister, and the piping used.

SMT-FTX Fuel Tuner - ShiftF1 - Parameters