Disclaimer: The information provided on this page is intended as a guide and reference. Given the complexities involved with electronics, computers, and automotive systems, it is crucial to conduct thorough research and planning before proceeding. We do not assume responsibility for any actions taken or their outcomes, whether based on the information provided or otherwise. Please exercise caution, prioritize safety, and ensure proper procedures are followed to avoid any unintended consequences.
Featured Articles/Videos
Learn how to upgrade an existing Microsquirt to the new MS3Pro Mini
In this article, we will show you how to modify your existing Microsquirt harness and get a HUGE upgrade to MS3Pro Mini.
Learn how to set up your Generic Outputs! MS2/MS3, Part 1: Basic
In this article, we will show you how to use a generic output to turn on basic devices such as cooling fans, second fuel pumps, or other on/off devices.
Learn how to set up your Generic Outputs! MS2/MS3, Part 2: Advanced
In this article, we go over using port statuses and bitwise operations for complex setup. This is handy for creating new functionality. Do you want to activate a dump solenoid when on the 2-step? Want to use a single button for both scramble and bump? This is the guide for you!
Learn how to use MS3Pro Failsafe Features
In this article, we discuss the fail-safe features of the MS3Pro in this DIYAutoTune guide. Learn how these features work to prevent damage and keep your vehicle running smoothly, providing crucial insights for both experienced tuners and beginners alike.
Installation and Wiring
- MS3Pro & MS2 Megasquirt Wideband Installation
- MegaSquirt Ground Pins
- How-To: Setup Base Ignition Timing
- Installing MegaSquirt in Parallel with the Stock ECU
- Will the MegaSquirt work with my stock ignition system???
- Measuring and Calibrating your Coolant (CLT) and Intake Air Temp (IAT) sensors
- Using MegaSquirt with a PerTronix Ignitor
- Using MegaSquirt with an MSD distributor
- Using MegaSquirt with Chevy Vortec ignition modules
- Controlling Gauges with MS3
- Adding a crankshaft position sensor and camshaft position sensor to an older engine
Tuning and Settings
- MS3Pro Failsafe & Engine Safeties
- MS3Pro Injector Dead-Time Configuration
- MS3Pro Closed Loop Idle – PWM Valve
- MS3Pro Closed Loop Idle – Stepper Valve
- MS3Pro and MS2 Output Test Modes
- How-To: Setup TunerStudioMS
- Tuning Pre-Fundamentals [Coming soon]
- Tuning Basic Acceleration Enrichments on your MegaSquirt EMS
- Secrets to Getting a Smooth Idle
- Dialing in the MegaSquirt Startup Settings
- Taking your MegaSquirt to the Dyno
- Road / Track Tuning your MegaSquirt Engine Management System
- Getting MegaSquirt’s stepper IAC control dialed in
- Big Power Management in a Low Traction World: Dialing in your traction control
Internal ECU features and troubleshooting
- How to Adjust the MegaSquirt VR Trim Pots
- Bench testing the MegaSquirt VR circuit
- Using Bosch BIP373 coil drivers with Megasquirt
- Troubleshooting MegaSquirt Communications Issues
- Common MegaSquirt Modifications
- Troubleshooting the MegaSquirt Injector Driver Circuit
- A Look Inside the MS3Pro Ultimate’s Programmable Peak and Hold Injector Driver
- Loading MegaSquirt firmware using TunerStudio
Accessories
- Using Third Party Displays, Data Logging Units, and Smartphones with MegaSquirt
- Installing an Innovate Wideband and Gauge on a Buell Motorcycle (or any motorbike really)
- Connecting an Innovate LC-2 to a gauge and a MegaSquirt ECU at the same time
MegaSquirt and MS3Pro/MSPNP Tuning Tips
MegaSquirt Installation Writeups
From DIY Plug-n-Play setups to starting from scratch to build your own harness, and from factory EFI conversions to MegaSquirt to carb-to-EFI conversions. These articles are being gathered from around the web to give examples of how people are implementing the MegaSquirt ECU on various vehicles. Some contain very detailed technical information and wiring diagrams, some are more general in nature. If you know of an article that should be featured here email me a link at [email protected].
Documentation for Current DIYAutoTune Hardware
Here you will find manuals for devices which were either designed by DIYAutoTune.com or are not official Bowling & Grippo products, not covered on the MegaSquirt documentation. These are supported through DIYAutoTune.com directly.
- MS3-Pro Standalone Engine Management
- MS3-Pro Module
- Information about our MSPNP line of Plug and Play ECUs
- DIYPNP build it yourself plug and play systems
- DIYBOB adapter boards
- Zeal Engineering Daughterboard
- DIYAutoTune.com 36-1 Crank Trigger Wheels
- DIYAutoTune.com Nissan Optical Bolt In Trigger Wheels
- QuadSpark Ignition Module
- HSD-4 High Side Driver Module
- JimStimX Assembly and Usage Guide
Legacy DIYAutoTune Hardware Documentation
Please be advised that the MS1-based Megasquirt products are obsolete and are no longer supported. We will not be providing any support for these products. For documentation assistance, you may refer to the links provided below for any available documentation and resources.
- Mustang 5.0 MS2 + PNP Adaptor Harness kit
- MegaView Kit Assembly Instructions
- GM TBI adapter board for 746/747 series ECUs
- GM TPI adapter board for 165 series ECUs
- MegaEFI adapter board for EEC-IV Fords
- VVTuner variable valve timing controller
- CAN-EGT 8 channel EGT module
- Download CAN-EGT firmware 0.1.5
- eMS-Pro Installation Guide (PDF)
- eMS-Pro Tuning Guide (PDF)
Project Car Archives
These installations do not always use current parts, firmware, or settings.
MegaSquirt and related Technical Videos / How-To’s
Customer Submitted Technical Articles
Tips, tricks, and cool installations sent to us by our customers.
- Modifying a GM DIS coil pack base for direct coil control
- EDIS on an early Ford Bronco
- Modifying a Zeal Engineering Daughterboard to control a 3 wire IAC
- DIYPNP installation on a 1998 Toyota RAV4 with the 3S-GE
