Quick Links

MegaSquirt-II Programmable EFI System PCB3.0 - Kit
MegaSquirt-II Programmable EFI System PCB3.0 - Kit
MegaSquirt-II Programmable EFI System PCB3.0 - Kit
MegaSquirt-II Programmable EFI System PCB3.0 - Kit
MegaSquirt-II Programmable EFI System PCB3.0 - Kit
MegaSquirt-II Programmable EFI System PCB3.0 - Kit

MegaSquirt-II Programmable EFI System PCB3.0 – Kit

4.82 out of 5 based on 11 customer ratings
(11 customer reviews )


In stock

SKU: MS230-K Category: Brand:


MegaSquirt-II Engine Management System with 3.0 main board – Unassembled Kit with Black Case; Part # MS230-K

The MS230-K kit includes everything you will need to build your MegaSquirt-2. The genuine B&G partial kit with PCB3.0, the Bill Of Materials (note: BIP373 coil driver is sold separately as most installations do not need this), the case, pre-machined endplates and heat sink bar, even the tube of heat sink compound and a bit of jumper wire is included. All you add is tools, solder, and time! The only other thing you might need is a tuning cable if you don’t have one already. I have those available as well for a few bucks.

MS230-K Kit Bill Of Materials (BOM) Includes:

  • MS2 daughter card
  • All ‘Basic Components’
  • PWM Flyback Damping Circuit components
  • Hall Sensor/Coil(-) and VR Sensor Ignition Trigger Components
  • Current Limiting Circuit Components

That’s right, everything needed to build this to the standard configuration is included.

Legend for Kit Labels

The MegaSquirt 2 Standalone EMS is truly a dream ECU computer for the DIYer. This latest rendition can control fuel, ignition, stepper motor IAC, and more for your turbo, supercharged, or naturally aspirated engine. More information about MegaSquirt-II can be found here.

MegaSquirt II includes all of the features and benefits of the original

  • Onboard MAP sensor for NA or boosted engines up to 21psi!
  • Speed density or Alpha-N.
  • Use any injector – High or Low impedance.
  • Compatible with output from narrowband sensors and wideband O2 systems.
  • Log data on your laptop for later analysis.
  • Tuning software is free for download and regularly updated with new features.
  • Source code and hardware information is available online allowing you to customize things beyond the massive feature set already available if you choose.
  • Includes proper female DB37 connector and shell for your wiring harness.

Additional Features with MegaSquirt-II

  • 24 MHz HCS12 processor
  • Fuel control to 1 µsec (100 times more resolution than MegaSquirt-I),
  • Ignition control (full spark timing advance control, dwell control, etc) for one coil/distributor (7 pin HEI for example) and Ford’s EDIS systems,
  • On-board stepper motor driver for IAC stepper control (this requires a few jumpers, included in the kit, to be added on the MegaSquirt PCB to connect the socket jumpers to the DB37 connector),
  • Ford PWM idle valve firmware support,
  • Built-in rev limiter, either ‘fuel cut’ or ‘spark retard’,
  • All tables are now 12×12 in size,
  • WBO2 AFR target table (in AFR units),
  • Independent dual-tables for VE and AFR target,
  • EGO feedback in wide-band mode is proportional to the difference between the measured AFR and the target AFR, the bigger the difference, the bigger the feedback step,
  • Spark advance table can have different rpm and kpa bins than VE and AFR tables,
  • 115,200 baud serial interface with MegaTune2.25+,
  • CANbus networking
  • Barometric correction amount and direction configurable in software, and provisions for:
    • barometric correction based on initial MAP reading,
    • independent 2nd barometric MAP sensor for continuous real-time baro correction, or
    • no baro correction.
  • TPS values for open loop and flood clear mode are user configurable,
  • MAP based open loop can be set as well as TPS,
  • Both TPS and MAP based accel enrichment is built into the code, you can configure the ratio of each,
  • Blended Alpha-N and speed density is an option,
  • 2 spare I/O lines for custom controls. (This is in addition to 4 lines for Idle stepper control if you don’t need this, or the Fast idle solenoid then becomes a spare if you do use a stepper motor.)

DIYAutoTune Kits and Completed Units also Feature:

  • Extruded Aluminum case with CNC machined flanged ends for easy mounting and a perfect fit!
  • The crystal and all nuts are glued in place to reduce sensitivity to vibrations. (Completed units)

Available Source code means Endless Development.

As with the original MegaSquirt EFI system the MegaSquirt 2 is an open project allowing anyone to customize the hardware and code to meet different needs.  This firmware’s feature set has grown hugely and continues to be refined.  If there’s a feature you’re after, chances are MS2/Extra can do it!

As with all unassembled kits, the quality is second to none. Everything is meticulously organized and labeled to help make your ECU assembly go as smoothly as possible. For example, each of the above bags contains a certain type of part, one with all of the resistors, one with diodes, one with capacitors, etc. Inside each of these bags the parts are further broken down and labeled in their own individual baggies as pictured below. We even go so far as to put the components in numeric order to make finding them easier. We’ve really tried to think of everything.


Here’s a shot of a complete, assembled unit. This shows the silver case, but the board is the same.

Customers' review

Rated 4.82 out of 5 stars
11 reviews
4 stars 0 0 %
2 stars 0 0 %
1 star 0 0 %

11 reviews for MegaSquirt-II Programmable EFI System PCB3.0 – Kit

  1. 5 out of 5

    megasquirt 2 efi kit 3.0he comprado 5 kits ms2 3.0 y una 3.57 ensamblada y todo va funcionando al 100% exelente apoyo post venta con estos sistemas efi programables los tuners hacemos realidad nuestros sueños. lo recomiendo muy ampliamente y le otorgo five stars positive feddback.

    Was this review helpful to you? 0 of 0 people found this review helpful

  2. 5 out of 5

    Great!Amazing kit for DIY EFI! I bought 2 kits, 100% working well!

    Was this review helpful to you? 4 of 4 people found this review helpful

  3. 5 out of 5

    i buy about 15 ms2 from diy autotune and a lot of components.
    very good quality,fast service and fast answer for litle problems or suggestions.
    have a lot of cars and offroad runs with megasquirt,i am very happy.

    Was this review helpful to you? 2 of 2 people found this review helpful

  4. 5 out of 5

    This is a great kit. It was very straight forward to put together as there is plenty of documentation on how to get everything together and working.

    More importantly the guys running this site are great. They are enthusiastic about what they are doing, and very willing to help out.

    Can't say enough good things about this site, the people or their products.

    Was this review helpful to you? 2 of 2 people found this review helpful

  5. 5 out of 5

    Para motores con sensor de cigüeñal (CKP) te recomiendo una Megasquirt II con PCB 3 o 3.5, con esta se logra hacer funcionar bien el motor, ... ó una Megasquirt III con la expansión MS3X para que tu inyección sea secuencial, y puedas comandar el módulo de Aire Acondicionado, ralentí, etc..... personalmente mi iría por la Mega III, pero insisto la Mega II es suficiente para el motor del Lancer, si estas en México contáctame en DIAC Performance, somos dealers de Megasquirt, y tenemos una área de investigación y desarrollo de electrónica automotriz.

    Was this review helpful to you? 0 of 1 people found this review helpful

  6. 5 out of 5

    What a great kit! Had it together over the course of a weekend working on it on and off. Running MS extra 3.2.5 firmware. Kit was labeled perfectly and the instructions in the megamanual were clear and concise. I convinced a couple local racers to fuel inject their cars this winter after seeing my ecu put together so easily. Hopefully I will be doing a couple more of these this winter. Shipping again was extremely quick and insured.

    Was this review helpful to you? 1 of 1 people found this review helpful

  7. 3 out of 5

    quiero comprar un ecu magasquirt para un mitsubishi lancer 2003 sohc 4g94 2.0 4cil y no se cual

    Was this review helpful to you? 0 of 7 people found this review helpful

  8. 5 out of 5

    I was amazed by how simple it was to build ! As said by other reviewers , the bags are labeled so well ,that its almost impossible to make a mistake during the assemby ! It took me 4 hours to get it complete in front of me ! Tested it with the stim and everything was fine !!

    Was this review helpful to you? 1 of 2 people found this review helpful

  9. 5 out of 5

    Hi all

    Did order this 2 weeks ago and I got exelent help from the staff of DIYAutotune, the stuff arrived 4 days later , and its already assembled an tested and works great.
    A real god kit with every part labeled in small plastic bags. Making it real easy, even for a moron like me, to assemble.

    Fair Winds from Lars

    Was this review helpful to you? 0 of 0 people found this review helpful

  10. 5 out of 5

    I bought this kit, took about 4 business days to get to my door. Great deal!! Easy instuctions available from the megasquirt info website.

    Was this review helpful to you? 0 of 0 people found this review helpful

  11. 5 out of 5

    GREAT KIT. Bought this about a month and a half ago, was a blast to build, all of the parts in the BOM are labeled on each bag, there are no missing parts and everything is just so enjoyable and low stress due to the good labeling of the bags as per B&G assembly guide.

    Was this review helpful to you? 0 of 0 people found this review helpful

Add a review

What inputs and outputs are provided with this kit?

  • It includes the circuitry needed to connect to the following sensors and outputs:
    • Coolant temperature
    • Intake air temperature
    • 2.5 bar MAP sensor (onboard)
    • Oxygen sensor – narrow band or wideband with external controller
    • Throttle position sensor
    • On/off fast idle valve
    • Stepper fast idle valve
    • 2 injector output channels
    • Tach input – Hall effect, optical, or VR sensors supported
    • Single direct coil control spark output

I’ve seen a mention of an MS2 Daughter Card. Do I need to order that separately?

  • No. The MS2 daughter card is included as part of this kit.

Does this kit include a MAP sensor?

  • Yes, there is a 2.5 bar MAP sensor included. It is a small UFO-like item in a static resistant bag and will not look like a conventional GM MAP sensor.

What firmware does it have?

  • The daughter card ships without firmware. You will load firmware during assembly.

Questions & Answers

  1. 0 votes

    The Series 3 was in production for over a decade and they used a lot of different factory electronics during its production run. Please contact our technical support team with details of what trigger wheels are currently on the engine and what coils you wish to run. We'll be glad to help you pick out the right parts for your specific build.

  2. 0 votes

    The MicroSquirt ties in over CAN bus and so the MS2 or MS3 and MicroSquirt can be tuned with the same laptop at the same time and share data.  Please contact our tech support team for us to draw up a detailed quote.

  3. 0 votes

    We'll need to go over this project in more detail. Please contact our tech support team for a recommendation specifically for your project.

  4. 0 votes

    Please see the MS2/Extra V3.0 hardware manual for current assembly directions.

    Volvo used several different ignitions on these cars. If you have an LH2.2 ignition, see our Volvo MegaSquirt installation guide. If you have a later crank triggered one, see the notes on missing tooth crank wheels in the hardware manual above.

    If you have any questions, please contact our technical support team.

  5. 0 votes

    The MS2 and MS3 will have similar ignition capabilities on a four cylinder for this particular application. However, the MS3 will make it easier later to add sequential injection, as well as advanced power management and boost control features if you go turbo later. If you're on a tight budget but will want MS3 features later, you can start with an MS3 kit without the MS3X, and add the MS3X later.

  6. 0 votes

    Yes - see this article for our recommendations for engines running a GM TBI ECU. Please contact us if you have any questions or need help drawing up a full list of recommended parts.

  7. 0 votes
  8. 0 votes

    As long as the injectors are EFI type (not Bosch CIS, K-jetronic, or other mechanical injection), they should work fine.

    The MS2 supports many common European ignition systems. If you can send us details of what crank trigger or distributor trigger pattern this is using, we can check if this is compatible. Worst case is, you may need to add a 36-1 or 60-2 crank trigger.

  9. 0 votes

    It can run this engine with the right build options. It is easier to run the distributor equipped 5 cylinder variants, but it is also possible to build an MS2 for 5 coil on plug outputs.

  10. 0 votes

    The MS2 can run this engine in a bank to bank fashion; you'll need to modify it for four spark outputs and for PWM IAC output, and possibly other features as well.

  11. 0 votes

    It can, although it is likely to need some extra mods. Please see the MS2/Extra V3.0 hardware manual for details.

  12. 0 votes

    It will with the appropriate mods. See this link for more details.

    How to install MegaSquirt on a 1990-1997 Miata

    Another option would be a DIYPNP. The kit costs more, but once completed, it will plug into your factory wiring harness on this particular car. Assembly time for a DIYPNP is approximately half the time needed to build a V3.0, as well.

  13. 0 votes

    It can run this motor in batch fire as long as you either retain the stock ECU for the drive by wire or swap to a cable operated throttle. You will need mod kits for the ignition as it only includes one coil driver.

  14. 0 votes
  15. 0 votes
  16. 0 votes

    The DIYPNP makes a lot of optional circuits standard (boost control, knock control, a number of relay outputs, and more) and the assembly time is typically about half what it takes to build a V3.0. It is also much easier to set up a DIYPNP for sequential injection than a V3.0.

  17. 0 votes

    There are several ways to modify it for distributorless ignition. If we do not have a model specific installation writeup for the particular engine you plan to use this on, have a look at section 5.3 of the MS2/Extra V3.0 hardware manual for ignition output mod options.