by Bowling and Grippo

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MegaManual Table of Contents

This is the index to the latest web-based version of the manual for the MegaSquirt® EFI Controllers. This index and the manual has been written and is maintained by Lance Gardiner ("Lance" on the forums). This manual is updated frequently, and contains the latest information on assembling, testing, troubleshooting, installing, and tuning your MegaSquirt® EFI Controller from Bowling and Grippo.

For the MegaSquirt® Frequently Asked Questions and answers, click here.

MegaSquirt® and MicroSquirt® controllers are experimental devices intended for educational and research purposes. MegaSquirt® and MicroSquirt® controllers are not for sale or use on pollution controlled vehicles. Check the laws that apply in your locality to determine if using a MegaSquirt® or MicroSquirt® controller is legal for your application.

The links in the left column take you to the various sections of the manual, the links on the right take you to the specific subsections.

Introduction to the MegaSquirt® EFI Controller

Start here if you are new to MegaSquirt® EFI Controller, this contains important background information.

How the MegaSquirt® EFI Controller Works

This section contains fundamental information on how the MegaSquirt® EFI Controller works, and how it doesn't.

MegaSquirt-II™ Processor Upgrade

Here is information on the MegaSquirt-II upgrade daughter card.

MicroSquirt™ EFI Controller

Here is information on the MicroSquirt® fully assembled, reduced size ECU using MS-II.

MS-II Sequencer™ EFI Controller

Here are links to information regarding the MS-II Sequencer™ fully assembled ECU that can do sequential injection and individual cylinder fuel and spark trim.

The V3.0 MegaSquirt® Main Board

This section contains the information on the V3 main board.
If your V3.0 main board does not have the white manufacturing mark on the silkscreen in the upper right corner on the back of the board:

your board is NOT a Bowling and Grippo main board, and these instructions DO NOT APPLY to your board. See here for more details. Ask your seller to exchange it for a genuine B&G board, or give your money back.

V3.57 SMD Main Board

Information about the V3.57 SMD 'pre-built' MegaSquirt® main board.

Assembling Your v2.2 MegaSquirt® Main Board

This section contains the v2.2 main board assembly guide and troubleshooting information.
If your V2.2 main board is RED, your board is NOT a Bowling and Grippo main board, and these instructions DO NOT APPLY to your board. Ask your seller to exchange it for a genuine B&G board, or give your money back.

Schematics & Troubleshooting

Various MegaSquirt® schematics and other info for troubleshooting.

Wiring and Sensors

This section has information on external wiring and sensors for use with the MegaSquirt® EFI Controller. It is mostly for MS-I, for MS-II, also see the individual documents (above) for IAC, ignition, MAF, knock sensors, etc.

Injectors & Fuel Supply

This section contains information on selecting and using air and fuel supply components for use with the MegaSquirt® EFI Controller.

Tuning Your MegaSquirt™ EFI Controller

This section explains how to configure and tune MegaSquirt™ on your engine.
  • MS-II™ FUEL:
  • MS-II™ IGNITION:
  • MS-I™ (fuel only):

    • TunerStudioMS/MegaTune

    TunerStudio is Phil Tobin's version of a tuning application for MegaSquirt®. It provides the ability to configure and tune all MegaSquirt controllers and is 100% compatible with MegaTune INI files and MSQ's.

    Eric Fahlgren's earlier tuning software for MegaSquirt is MegaTune.

    The tuning parameters available depend on the code and the associated INI files (not the tuning software), so the same descriptions applies to all tuning softwares.

    Files

    This section has links to various code files, software, and documents in PDF format.

    MegaSquirt® Embedded Code

    Here are guides to writing, compiling, and loading embedded code to MegaSquirt®.

    Appendices

    Miscellaneous MegaSquirt® Information.

    MegaSquirt® and MicroSquirt® controllers are experimental devices intended for educational purposes.
    MegaSquirt® and MicroSquirt® controllers are not for sale or use on pollution controlled vehicles. Check the laws that apply in your locality to determine if using a MegaSquirt® or MicroSquirt® controller is legal for your application.
    ©2004, 2010 Bruce Bowling and Al Grippo and Lance Gardiner. All rights reserved. MegaSquirt® and MicroSquirt® are registered trademarks. This document is solely for the support of MegaSquirt® boards from Bowling and Grippo.