Classic MegaSquirt 3 ECU V3.57

For the next-gen MS3Pro Universal ECU lineup - CLICK HERE

The Classic MegaSquirt 3 with PCB3.57 is a powerful standalone engine management system that offers significant improvements over MS1 and MS2 platforms. Built around the MS3 daughterboard, this system provides greater processing power, higher resolution fuel and ignition tables, and support for modern engine control strategies.

This version is preconfigured for basic fuel and spark setups using batch fire injection and a single logic-level ignition output. When paired with the optional MS3X expansion card (sold separately), it transforms into a fully featured, sequential-capable ECU with support for up to 8 channels of fuel and ignition control, plus advanced features like nitrous, traction control, and more.

Key MS3 Core Features:

• 16x16 VE and ignition tables with full interpolation

• 0.1% fuel step resolution, 0.1° ignition accuracy

• Built-in USB port for easy laptop connectivity

• SD card socket for onboard datalogging (SD card not included)

• Closed-loop fuel and idle control

• GM stepper IAC support

• CANBus communications for GPIO, IO Extenders, and more

• Staged injection capability

• Native support for many OEM crank/cam trigger patterns

• Preconfigured for 2 fuel injector outputs + 1 logic-level spark output

Expand with MS3X (Sold Separately) to Unlock:

• 8-channel sequential fuel injection

• 8-channel sequential ignition control

• Cylinder-by-cylinder fuel and spark trim

• 2- and 3-wire PWM IAC valve support

• 2-stage progressive nitrous control

• Table switching for dual fuel or alternate tunes

• Launch control and 2-step rev limiters

Whether you’re starting with a basic engine setup or planning a fully featured, sequential race application, the MegaSquirt 3 with PCB3.57 gives you a modular, affordable path to advanced tuning.

Note: MS3X expansion card required for sequential injection and full ignition control. Harnesses and sensors sold separately.