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SMT8_4 Technical Manual - Keywords

SMT8_4 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8 V4 Unit.

KEYWORDS

ECU

The computer “box”, which is controlling the engine’s operation

 

MAPPING

A process by which, a signal is manipulated via the various tuning maps.

 

INTERCEPTING

A wire is cut, and the two ends are “routed” through the SMT8_4 for the purpose of changing the signal.

 

TEE IN

A wire from the SMT8_4 is joined to the standard wiring loom. The signal is only read, and no modifications take place.

 

LAMBDA, OXYGEN, AFR

A lambda probe, oxygen probe, or AFR sensor all measure the oxygen content in the exhaust pipe. At lambda 1.00 the AFR=14.7 and a narrow band sensor generates a voltage between 0.2 and 0.8 Volts.

 

CHIPPING

Traditionally this applies to changing the “chip” of the ECU to provide better performance. When ECU’s started to control the engine it meant changing an EEPROM. The term now also applies to adding a SMT8_4 to the car, without changing any chips or EEPROMS. The SMT8_4 has the advantage over chipping because of the online tune and the re-tune capability.

 

MAF

Mass Air Flow sensor. It could be a device with a “FLAP” or a solid-state “hot wire” sensor. It generates basically an analog output voltage, which increases with higher airflow. Some devices compensate for air temperature (density).

 

MAP

Manifold Absolute Pressure. It is a solid-state device with 3 wires and provides an analog output voltage, which increases as the manifold pressure increases. Since it measures the absolute pressure the output voltage DECREASES at idle. We don’t like this term because is also applies to a tuning map.

 

AMP

Absolute Manifold Pressure. The same thing as a MAP! We like this term because it can’t be confused with a tuning “map”.

 

MAP SWITCHING

All of our units have two tuning maps, which can be switched while driving. There are THREE possible map-switching scenarios.

 

CAM 1, 2

Our terminology for ignition signal inputs from a possible of 2 CAM’s.

 

PWM

Pulse Width Modulation. The information is in the ON to OFF signal ratio.

 

WIDE BAND LAMBDA

This is a 5 wire lambda probe (BOSCH LSU-4) with the part number starting with 025800. The SMT8_4 can read the probe information and can modify it. This probe is very popular because it measures the AFR very fast and at very RICH mixtures, which is useful for turbo/supercharger applications.

 

PICKUP

It is a sensor, which “picks up” an engine measurement like temperature or crank angle position. The sensor can be a Hall Effect (square wave) or magnetic (sine wave).

 

FEED-THRU

A method where a wire is cut and routed through the SMT8_4 for the purpose of modifying the electrical signal.

 

BALANCED INPUT

Refers to a magnetic pickup (CRANK) where the pickup coil is isolated from ground. If a balanced input is tested with a scope, then both wires have an opposing signal on it. The SMT8_4 has a balanced input on the CRANK trigger input.

 

MAP SWITCH INPUT

A switch input when not used defaults to MAP=A.

 

SET POINT RELAY DRIVES

An “open collector” output, which can drive a relay of 1A at 12 volts. The unit switches to ground, so the other coil wire of the relay must be connected to + 12v battery or switched +12v. The output state can be configured via the tuning software to switch on various set points. It can also be set to depend on the polarity and in the case of linked set point functions an AND\OR logic state.

 

INJECTOR DRIVE

The SMT8_4 switches to ground. The current rating is sufficient for ONE 13 ohm injector per output.

 

DEFLECTION OR THROTTLE INPUT

It is a tee-in signal in the range from 0 –5Volts. Normally a low voltage refers to a closed throttle.

 

ETC

Electronic throttle control. This is a throttle body that is controlled by the ecu electronically and not by a conventional cable

 

WIRELESS

The wireless communication requires a USB/Wireless adapter (Part Number: WireX) which can be used for ALL other wireless products. Communication is on the 2.4GHz band on 16 frequencies with a range of 5 to 20 meters, depending on installation.