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Engine Management Systems


Microsquirt V3



Tuner Studio

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Making the most of your Megasquirt - information and support focussed on MSEXTRA firmware and MS3.

Megasquirt is a range of standalone engine management systems. All systems are intended for DIY install and most installs are self tuned. With Megasquirt you get the opportunity to learn how engine management works and gain full tuneability of your engine. Be sure to read the documentation here and on vendors' sites to see which of the product range is right for you to get the best results.

Product Information

Product features and technical details for all ECU products

How to Purchase

Purchasing guidance and link to suppliers list


Read the manuals here

Support Forum

Active support forums. Support from the main suppliers and developers. Be sure to read the manuals first.


Download tuning software and firmware here


See what Megasquirt version you have and check it is genuine.

What's New?

  • December 2014 - DIYAutoTune are exhibiting at PRI. See here.
  • September 2014 - Updated Megasquirt-3 manuals available in PDF on the manuals page.
  • August 2014 - New world wheelie record set using MS3-Pro. Read more here.
  • July 2014 - Megameet 2014 announced, see here.
  • July 2014 - Updated Megasquirt-2 manuals available in PDF on the manuals page.
  • July 2014 - MS3 firmware 1.3.2 released.
  • March 2014 - MS3EFI content merged with MSEXTRA. News below was mostly from MS3EFI.COM
  • March 2014 - MS3 firmware 1.3.0 released.
  • June 2013 - 'MS3 Gold' LSX plug'n'play now on sale. Read more here
  • November 2013 - MS2/Extra firmware 3.3.0 released.
  • January 2013 - Megasquirt 3 software 1.2.0 released.
  • January 2013 - MS3-Pro now on sale.
  • November 2012 - DIYautotune announce new MS3-Pro product at PRI. Read more here
  • August 2012 - Megasquirt 3 software 1.1.2 released.
  • July 2012 - Megasquirt 3 software 1.1.0 released. Read more here
  • March 2011 - Megasquirt 3 software 1.0.2 released.
  • January 2011 - Megasquirt 3 software 1.0.0 released.
  • October 2010 - Megasquirt 3 used in Engine Masters competition.
  • August 2010 - Megasquirt 3 and MS3X now full retail.
  • June 2010 - MS3X boards out to wider group of beta testers.
  • May 2010 - Latest version MS3X boards out to developers. Installed and running on five cars.
  • March 2010 - MS3 boards retail sales begin! First batch sold out in 12hrs
  • December 2009 - Engines now running full sequential with the MS3X board. "Beta 2" testing underway.
  • November 2009 - MS3X boards en-route to beta group. Another 20 MS3 due for sale imminently as "beta phase 2"
  • September 2009 - Samples of MS3X board due soon
  • August 2009 - Megasquirt-3 now running on eight engines
  • June 2009 - First MegaSquirt 3 installed on a car for long term beta testing.
  • April 2009 - MegaSquirt 3 announced at annual "Megameet" Megasquirt conference. Features include sequential fuel and spark, SD card datalogging and more. (See Product information)
    • First two vehicles test fired up on MS3.  A 1984 RX7 GSL-SE and a 1977 Chevy Nova converted to MPFI. 

Corvette Honda RC51  SeaDoo Cortina