MicroSquirt ECU Version 3.0

The versatile MicroSquirt ECU Version 3.0 is an ECU plus much more – Original designed as a Standalone Engine Management System for small engines, specifically thinking as a motorcycle ECU or other small engine ECU, the functionality of this versatile system has since been expanded to allow it to also be used as a Transmission Controller or CAN I/O Expansion Module (alternate functionality requires firmware change)

MicroSquirt ECU is our entry-level, fully assembled ECU with varied applications targeting powersports and single cylinder engines all the way up to 8 cylinder engines with up to 2 fuel and 4 spark outputs. Over 40 different ignition modes are supported from mainstream applications like GM LS1, Ford Zetec, Bosch Motronic, and Chrysler Gen III Hemis to unusual modes like Renix Jeep and the Suzuki Swift GTI.

MicroSquirt ECU hardware features

• 2 high impedance injector outputs – max peak current 4.5 amps
• 2 dedicated spark outputs
• 2 general purpose on/off outputs – can be repurposed as spark outputs
• 1 PWM IAC output – can be repurposed as general purpose output
• 1 dedicated fuel pump output
• 2 variable reluctor conditioned inputs
• 1 optoisolated RPM input
• 1 flex fuel or general purpose switched input
• 7 analog inputs

MicroSquirt ECU software features

• Supports speed density, alpha-N (TPS based), or MAF based fuel and spark tables
• 0.66 microsecond injector pulse width resolution
• Allows blending multiple load types, including specialized mode for independent throttle bodies
• Supports a wide variety of OEM cam and crank position sensors
• Accelerator pump or model based acceleration enrichment
• Closed or open loop idle speed and boost control
• On/off nitrous control
• Wankel rotary support: 2 rotor engines with separate leading and trailing spark tables
• Staged injection
• Table switching
• 16 x 16 fuel tables
• 12 x 12 spark tables
• 2 step rev limiter (launch control) with no-lift shifting
• Wideband AFR target table
• Flex fuel sensor input
• Real time barometric correction (external sensor required)
• Sequential shift cut and air shifter control

MicroSquirt ECU Transmission Control Options

MicroSquirt transmission control free firmware allows you to use MicroSquirt with 30″ Harness to control a number of electronic automatic transmissions (gearboxes). It can work standalone or integrate with one of our ECU’s over CANBUS.

Control applications: GM 4L60E I GM 4L80E I GM 4T40E I GM 5L40E (dev) I A341E I 41TE (dev) I Ford 4R70W I Ford E40D (dev) I Subaru W4A33 & more…

MicroSquirt ECU CAN I/O Box Expansion

Microsquirt I/O Box firmware allows you to use a Microsquirt as a plug’n’play I/O extension box for MS3 or MS3Pro ECUs. It can offer a useful I/O addition:

• 7 Analog inputs (0-5V variable)
• 2 Wheel speed inputs (VR or hall type)
• 2 Wheel speed (hall type) or ground-switch inputs
• 1 dedicated ground-switch input
• 2 high current PWM/switch ground-switching outputs
• 4 mid current PWM/switch ground-switching outputs
• 1 low current PWM/switch 0-12V output
• Perfect for capturing and logging vehicle speed and additional sensor data (e.g. pre- and post- intercooler temperatures, fuel pressure, oil temperature etc.)

To Use a GM 1, 2, or 3 Bar MAP Sensor with the MicroSquirt ECU

In the illustration:

A is ground,
B is the sensor output signal to MicroSquirt,
C takes 5 Volts from MicroSquirt.

The pins are marked A-B-C on the sensor itself.

MICROSQUIRT USER MANUAL

MICROSQUIRT TUNING GUIDE

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