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MegaSquirt 3

MS3 – Fully assembled and tested, ready to wire in and go!

The MegaSquirt 3 (MS3) is ready to support a wide variety of engines out of the box, with the ability to control anything with one to eight cylinders with sequential fuel injection and sequential ‘coil on plug’ ignition, a V12 with semi-sequential fuel and wasted spark ignition, or a four rotor Wankel with separate leading and trailing ignition outputs. Over 50 different ignition modes are supported, from mainstream applications like the GM LS1, Ford Zetec, Bosch Motronic, and Chrysler Gen III Hemis to unusual modes like Renix Jeeps and the Suzuki Swift GTI. The software includes many ‘race’ type features, two stages of progressive nitrous, water injection, closed loop boost control etc. Vehicle speed sensing, logging of EGT (with external hardware.)

EPA, CARB & Emissions Disclaimer- All ECU's are for race purposes only. It's your responsibility to remain in compliance with all federal, state, provincial, or other laws that apply to you.

Showing 1–16 of 23 results

  • MegaSquirt 3 ECU with MS3X Expansion

    5 out of 5
    $749.90

    Important Note:  Due to supply chain challenges and the lack of ability to have parts anodized at this time, we are transitioning to brushed silver enclosures.  We appreciate your understanding.   The MegaSquirt 3 with MS3X expansion arrives equipped...

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  • MegaSquirt 3 EMS System V3.57

    $689.99

    Important Note:  Due to supply chain challenges and the lack of ability to have parts anodized at this time, we are transitioning to brushed silver enclosures.  We appreciate your understanding.   MegaSquirt 3 Engine Management System w/PCB3.57 - The...

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  • ECU Power Package

    $99.99

    Powering your PNP harness doesn't have to be a headache. The  ECU Power Package includes everything you need to get up and running quickly and safely. Whether you're starting a new install or cleaning up an existing setup, this bundle is the perfect sol...

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  • 4 Position Power Distribution Block Kit

    $39.99

    Simplify your 12V power distribution with our 4-Position Power Distribution Fuse Block Kit. This compact solution makes it easy to power multiple accessories or circuits from a single power source—ideal for custom wiring jobs, standalone ECU systems, or...

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  • 50 Amp Relay Kit

    $19.99

    Need reliable control over high-current circuits? Our 50 Amp Relay Kit is designed for switching heavy loads like fuel pumps, fans, or auxiliary power systems. This high-capacity relay is built to handle demanding automotive and motorsport applications wi...

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  • 8′ MegaSquirt Wiring Harness (MS1/MS2/MS3 Ready)

    5 out of 5
    $99.99

    MegaSquirt Wiring Harness - 8 Feet Long We've completely redesigned our wire harness to help you get your fuel injection installation right the first time with several new features to help make your installation as easy and reliable as possible: ...

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  • 8′ MegaSquirt Wiring Harness for MS3X

    5 out of 5
    $114.99

    MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 Heavy d...

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  • USB Tuning Cable for MegaSquirt-III/ MS3Pro 1st Gen

    $8.99

    Use this cable to plug your MegaSquirt-3, MS3-Pro 1st Gen, or MS3Pro Plug & Play for 2JZ Supra/SC300 directly into your USB port. No adapters required!

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  • MegaSquirt 3X Wiring Bundle – 8′ long

    5 out of 5
    $74.99

    MegaSquirt MS3X Wiring Bundle - Length = 8' 8' of TXL High temp automotive grade wire. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! Use with MS3X Expansion board or other sequential device Just ...

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  • MegaSquirt Relay Board – Assembled Unit

    5 out of 5
    $264.99

    MegaSquirt Relay Board - Assembled Unit - Part# MSRelay-C Though the Relay/Power Board is not required, it is a convenience and can reduce the chance of miswiring during the installation. The relay board provides a central place for all of the required...

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  • 24″ MegaSquirt Pigtail Harness (MS1/MS2/MS3 Ready)

    5 out of 5
    $59.99

    MegaSquirt Wiring Harness - 24 inches long Completely redesigned version adds more features to help make your installation as easy and reliable as possible. We've now brought the improvements from the long harness over to the pigtail harness. This min...

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  • 24″ MegaSquirt Pigtail MS3X Harness

    $79.99

    MegaSquirt MS3X Wiring Pigtail - Length = 24" 24" of TXL High temp automotive grade wire. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 ...

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  • MegaSquirt Relay Cable

    5 out of 5
    $109.99

    High Quality 4' Relay Board cable for connecting your MegaSquirt ECU to your Relay Board. Works with MS1, MS2, or MS3, all standard main boards (includes not just the IAC and ignition pins - it also has the spare pins on 3 through 6). It has a shielded...

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  • MegaSquirt Wiring Bundle – 8′ Long

    4.2727272727273 out of 5
    $62.99

    MegaSquirt Wiring Bundle 8' TXL wire, color coded with labeling printed on the wire every 3 inches -- no paper tags here! IAC and Ignition wires are included for MS-1 / MS-2 use (or MS-3 Primary Harness use) Shielded Ignition input wire Gre...

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  • MegaSquirt MS3X Wiring Bundle – 23″

    5 out of 5
    $29.99

    MegaSquirt MS3X Wiring Bundle - Length = 23" ~23" of TXL High temp automotive grade wire. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! Use with MS3X Expansion board or other sequential device J...

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  • MS3 Knock Module Kit

    5 out of 5
    $89.99

    This add-on board is designed to solder directly onto the MS3 daughterboard, providing two channels of knock input for the MS3 to use in retarding spark. This module features a significantly more sophisticated knock detection circuit compared to any previ...

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