Megasquirt - The Quintessential D-I-Y Fuel Injection ECU

There are a lot of off-the-shelf fuel injection controllers on the market these days. So why would I want to build my own? COST! Plain and simple. Why spend $900-$2500 for a controller, and still need to add a bunch of stuff, when you can get an open architecture, highly re-programmable, super flexible controller , for around $180!

Granted, the Megasquirt requires a bit of study, and a lot of reading to get going as desired, but the flexibility is utterly mind boggling! The system code I'm running is MSnS-E, which stands for Megasquirt and Spark-Extra. This is quite literally, a second source programming version that has taken the already super flexible system and added even MORE features.

A list of the features that you can control with this ECU and the 'Extra' firmware, is as follows....

Features Follow links for more info

12x12 fuel tables 12x12 spark tables DualTable code Roger Enns' injector staging code Rev limiter Overboost protection Mappable Air:Fuel Ratio target for use with wideband O2 Coolant temp timing advance Inlet temp timing retard MAPdot accel/decel enrichment Anti-rev / Traction Control feature Over-run fuel cut Afterstart Enrichments Cranking /Priming settings Hybrid Alpha-N Air Density Correction	All ignition options require some mechanical or electrical work Ignition control options: . No ignition (fuel only) . Distributor for even-fire 2 stroke 1,2,3,4 cyl and even-fire 4 stroke 1,2,3,4,5,6,8,10,12,16 cyl . Ford EDIS . Dual Ford EDIS (e.g. 2 EDIS4 modules on a V8) TEST . Dodge Neon crank decoder . Ford TFI . GM 7 pin HEI . Toothed wheel decoder . Dual wheel decoder/2nd trigger . GM DIS . Buick C3I . Oddfire wheel decoder ALPHA TEST
Hardware changes needed for:
Switchable tables Boost control TEST Water injection control Dual EGO sensor support Shift Lights Launch Control/Flat shift Realtime Barometric Correction	Outputs 1, 2, 3 and 4 Knock sensor input PWM idle for use with variable valves TEST Nitrous control (min rpm, new timing map or fixed retard) EGT logging Tacho Output Pin Mass Air Flow Meter use a MAF for fueling calculations

as of 8/2006 my current configuration is as follows:
Megasquirt version: MS-I v.3
Megatune Program version: 2.25
MSQ Version: 029Q2
Ignition: Olds Cienna triple coil wasted spark assembly (electrically rewired)
Crank trigger: Ford 36-1 trigger wheel and sensor
Injectors: 14lb. x6, port injected p/n- E59E-A2B 195500-0733
Manifold: Custom built, 6061 aluminum, port injected, single throttle body
Throttle Body: Ford 50mm (recently downsized from a 60mm Mustang unit)
IAC: Ford Mustang - F73E-9F715AA
Fuel Pump: Walpro GL395 15mL (downsized from an MSD 255)

My 'Success Story' is on the MSEFI.COM at

Introduction	First Models	Sensors		Engine Management Basics
Requirements	Sub-systems	Tuning		Sizing Injectors
gas tank mods	Fuel supply system	My first ECU		F.I. Links - Sources
*Special Project* Wide Band Oxygen Meter				O2/Tach/Vac/Timing Logger
Other peoples Triumph F.I. Installations/Projects
*Special Project* Megasquirt - The Quintessential D-I-Y Fuel Injection ECU
Building a Custom GT6 Manifold			Whitey's F.I'ed Spit6 Project
Building an MGB manifold			Experimental twin bodies on a GT6
Building a twin TB MGB manifold			The other half of the story

©1987-2022 All material copyright© Teglerizer 1996-2008	last edited 3/15/08