MegaSquirt Technical Help For Installing EFI/EMS Systems

All of the following information is provided in the hopes that others’ efforts can be of benefit to you in your install. We do not have one of each type of vehicle mentioned here, therefore no first hand experience with most of these to confirm each of them.  This information is to help point you in the right direction to get your car Megasquirted.  As the MegaSquirt has historically been a Do-It-Yourself engine management system, we encourage you to take your time, do your research, and take responsibility for your installation and tuning.

Some of the articles may have base tuning maps available as well– it is important that you make sure you understand that often these maps will only work with the same version of firmware they were built on.  You can manually transition the settings over into a new firmware version, but loading an .msq into a different version than they were built on can have unpredictable results.  Also– just because a map was built on a car just like yours doesn’t mean you should load the map on your car and go for some WOT runs– take the time and be responsible for your own tune, make sure it works right on YOUR car, make sure the timing and AFR’s are right.  Consider these ‘base maps’ and NOT final products. MegaSquirt Install Articles

These are articles written and hosted here, still not always from first hand experience but often from information gathered with the help of others with first hand experience.  Credit, of course, is given in the articles to those who helped bring it all together.  These are ‘living’ documents that will be updated over time, if you see changes that need to be made please call them out!

Note: For DIYPNP installs, see the DIYPNP Models page.

Chevrolet / GM







Mopar (old school)

  • How to control the ignition on your vintage Mopar engine   Matt Cramer (owner of a turbocharged and MS’d Dodge Dart) pours out some of his Mopar and MegaSquirt knowledge for us all!  This article covers ignition control of vintage Mopars.  You’ll still have some other work to do if you want to convert to EFI as well…  You can always do one and then the other using the same MS…






MegaSquirt Support And Information/ Articles found throughout the Web

Not written/hosted by

1962 Corvair  Carb-to-EFI highlights

Ford Windsor Carb-to-EFI conversion  (relevant to any V8 EFI conversion )

Non-Car Specific– Carb-to-EFI Conversion

BMW 2002  (1973)            Carb to EFI Conversion using MegaSquirt

BMW 2002  (1973)           Carb to EFI Conversion using MegaSquirt

DSM — Second Gen Non-Turbo        Covers tapping into existing harness for fuel control.  Factory ECU controls timing.

DSM — 4g63 Powered        Full fuel and ignition control a la MSnS-E!

Mazda MX-6 / Ford Probe – covering the ’88-’92 models with the F2T turbo motor.

Mazda RX7  — Muythaibxr is the authority on MegaSquirt conversions on the RX7; here is his FAQ. This is a part of a Megasquirt subforumon RX7Club.

Mazda RX7 — Aaron Cake has a very in-depth writeup on his home page for how to make the MegaSquirt work with the RX7. Covers both MegaSquirt I and II.

Mercedes-Benz M110 — Installing a GM TBI on a carbureted motor.

Mercedes-Benz 280SL (1985) Detailed K-Jetronic to EFI conversion.

Mercedes-Benz 450SLC (1980) Converting from the mechanical K-Jetronic to a Megasquirt

MGB Write-ups:

Ford TFI  —  This used to point to a page that generically covered the Ford TFI ignition system with the MS-I and MSNS_E ignition system, that page is gone now.  Check out our How to MegaSquirt your Mustang! page for good info on what really applies to all TFI based ignition systems using the grey TFI module.

Toyota Corolla (AE86)    (1987)    Full replacement of factory ECU using MSnS-E to control fuel and spark

Toyota Paseo – Home made plug and play harness for the 5E-FE motor.

Toyota RAV4 – The same James L. who brought you the MR2 writeup tackles a 3S-FE RA4. Includes DIYPNP and regular MS2 information.

Triumph Spitfire with GT6 swap (1975) Carb to EFI swap along with a wasted spark ignition conversion

Volkswagen–  Two threads for your to check out here with tons of information

Volvos — You’ll find more Megasquirt writeups at — just search for ‘MegaSquirt’ on the message board.

More to come!  If you’ve got documentation you’d like to see posted here drop us an email to let me know!


Wanna learn more about how to tune EFI and Electronic Ignition?  OF COURSE YOU DO!
EFI Tuners Guide Banner with Carl in Camaro on laptopCheck out the EFI Tuners Guide!  How to Install, Configure, and Tune EFI!