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MegaSquirt 3 ECU with MS3X Expansion
MegaSquirt 3 ECU with MS3X Expansion
MegaSquirt 3 ECU with MS3X Expansion

MegaSquirt 3 ECU with MS3X Expansion

5 out of 5 based on 14 customer ratings
(14 customer reviews)

$762.00

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Frequently purchased together

Product Quantity

8' MegaSquirt Wiring Harness (MS1/MS2/MS3 Ready)

8' MegaSquirt Wiring Harness for MS3X

DB15 Pigtail Harness

MegaSquirt Tuning Cable (DB9 Straight Thru)

USB Tuning Cable for MegaSquirt-III/ MS3Pro 1st Gen

SKU: MS3X357-C_BL Category: Tags: , , , , , , , , , , Brand:

Description

Important Note:  Due to supply chain challenges and the lack of ability to have parts anodized at this time, we are transitioning to brushed silver enclosures.  We appreciate your understanding.  

The MegaSquirt 3 with MS3X expansion arrives equipped with features surpassing MS2 & MS1 systems, like sequential fuel & spark, 2 step, progressive nitrous, boost control, onboard traction control & much more!  MS3X paved the way for the powerful MS3Pro systems by AMP EFI.

MS3X helped Lee Sicilio to a 283mph record at Bonneville in his beautiful twin-turbo charged Daytona Charger.

Are you on a budget, but still want complete control of your race purpose vehicle?  MS3X has the features to give you a serious competitive advantage without breaking the bank.

MS3X Standard Features:

  • 8 Sequential fuel injection outputs. Each can drive a high impedance injector, unused injection outputs can be re-purposed.
  • 8 Logic level 5 volt ignition outputs. Works with many types of ignition modules and coils, including LSx coils and our IGN1A. Requires external module or coils with internal ignitors.
  • 6 Medium current outputs. Use for 2 stage progressive nitrous, boost control, tach output, 3 wire idle speed control, general purpose PWM or relay control, or many other potential applications.
  • 3 Analog inputs. Use for an external MAP sensor, second O2 sensor, fuel pressure, accelerometer, or general data logging.
  • 4 Switch inputs. Can be used to start data logging, arm a nitrous system, switch tables, launch control, VSS input (Hall sensor or VR with external conditioner), and more.
  • 1 Cam sensor input. Can be used with VR, Hall, or optical sensors.
  • VE and ignition tables are both 16 x 16 with full interpolation.
  • 0.1% steps on VE table, 0.1 degree steps on ignition table
  • Socket for an onboard SD card – no laptop required for data logging  (SD Card not included)
  • Built in USB port
  • GM stepper IAC control
  • Closed loop idle and mixture control
  • CANBus communications for interface with GPIO Board, IO Extender, or other devices
  • Staged injection
  • Native support for many different OEM trigger patterns

Connect MS3X via serial laptop connection and enable it in TunerStudio.

For complete MS3 documentation and more see http://www.msextra.com/

Customer reviews

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14 reviews for MegaSquirt 3 ECU with MS3X Expansion

Only logged in customers who have purchased this product may write a review.

What harness do I need with this?

  • You need both the MegaSquirt harness and the MS3X harness.

What inputs and outputs is the MS3 V3.57 with MS3X set up for?

  • It is set up for sequential fuel control and eight channel logic level spark output, with the following inputs and outputs:
    • Coolant temperature
    • Air temperature
    • MAP sensor (built in)
    • Throttle position sensor
    • O2 sensor – narrow band or external wideband controller
    • Crank and cam position sensor input – Hall, optical, or VR
    • On/off, stepper, or PWM idle control – unused idle control outputs can be repurposed as general purpose relay control outputs
    • Fuel pump relay
    • Eight fuel injector banks plus two fuel injector outputs for a second stage or general purpose outputs
    • 3 analog 0-5V inputs
    • Flex fuel input
    • 6 on/off or frequency inputs
    • 0-12V tach output
    • 5 general purpose on/off or PWM outputs
    • 8 5V logic level spark outputs
    • CANbus

What firmware does it have?

  • The MS3 V3.57 ships with the latest MS3 code. The code it initially shipped with will be indicated on a sticker on the underside of the unit.

Is the V3.57 board available in kit form?

  • The V3.57 is essentially a V3.0 that has been changed for machine assembly with very few differences. Consequently, it is not offered in kit form.

What connections are on the DB15?

  • By default, it only has a couple extra reference voltage and ground pins for sensors. The DB15 can be used for adding optional I/O if you run out of pins on the main connector.

Where is it built?

  • The components are assembled at various locations in the US, with final assembly completed in Suwanee, Georgia.

What is the warranty?

  • We provide a one year limited warranty against manufacturing defects.

Questions & Answers

    Would this work for a 4.6L V8 Mustang GT from 99 to 04
  1. 0 votes
    Q Would this work for a 4.6L V8 Mustang GT from 99 to 04
    Asked by Blake Rusboldt
    Answered by the admin

    Yes, please see our 4.6 Mustang installation notes for more details.

  2. What would I need to make this work in conjunction with my 86' 300ZX (VG30E)? I realize this is a rather broad question, but let's just say to make it run as if it were stock.
  3. 0 votes
    Q What would I need to make this work in conjunction with my 86' 300ZX (VG30E)? I realize this is a...... Read more
    Asked by Nicolas
    Answered by the admin

    A typical installation on a VG30E would use the following parts:

    $692.00 MS3X357-C_BL: Assembled Megasquirt-III V3.57 with MS3X
    $99.99 JimStim-C: Assembled JimStim diagnostic board
    $17.00 StimPower: JimStim power supply
    $83.00 MSHarness: 8' main board wiring harness
    $86.00 MS3X-Hrn: 8' MS3X wiring harness
    $22.49 IATwPiggy: Intake Air Temperature Sensor
    $9.49 38NPT-Bung_A: Aluminum bung for IAT sensor (Also available in stainless steel)
    $7.49 MS3TuneCable: USB communications cable for MS3
    $28.00 TW_L28ET: Optical shutter wheel to allow sequential injection with MS3
    $1045.46 Subtotal without wideband

    The wideband oxygen sensor system is optional, but a very useful tuning tool. We carry the Innovate line.

    Wideband Options:

    $189.00 LC-2 without gauge (you can still view real-time AFR and datalog AFR through your laptop)
    $219.00 MTX-L Plus digital gauge system
    $219.00 LC-2 with DB digital gauge (available in red, green, or blue)
    $259.00 LC-2 with G series analog gauge 
    $349.00 LM-2 basic data logger with one sensor 
    $399.00 DLG-1 dual wideband package with digital gauge 
    $479.00 LM-2 deluxe kit with one O2 sensor 
    $669.00 LM-2 deluxe kit with two O2 sensor

  4. What would I need to use this on an 87 fc rx7 naturally aspirated 13b
  5. 0 votes
    Q What would I need to use this on an 87 fc rx7 naturally aspirated 13b
    Asked by Jordan
    Answered by the admin

    This is what we would typically recommend for a rotary installation.

    $692.00 MS3X357-C_BL: Assembled Megasquirt-III V3.57 with MS3X
    $99.99 JimStim-C: Assembled JimStim diagnostic board
    $17.00 StimPower: JimStim power supply
    $83.00 MSHarness: 8' main board wiring harness
    $86.00 MS3X-Hrn: 8' MS3X wiring harness
    $22.49 IATwPiggy: Intake Air Temperature Sensor
    $9.49 38NPT-Bung_A: Aluminum bung for IAT sensor (Also available in stainless steel)
    $7.49 MS3TuneCable: USB communications cable for MS3
    $1017.46 Subtotal without wideband

    The wideband oxygen sensor system is optional, but a very useful tuning tool. We carry the Innovate line.

    Wideband Options:

    $189.00 LC-2 without gauge (you can still view real-time AFR and datalog AFR through your laptop)
    $219.00 MTX-L Plus digital gauge system
    $219.00 LC-2 with DB digital gauge (available in red, green, or blue)
    $259.00 LC-2 with G series analog gauge
    $349.00 LM-2 basic data logger with one sensor
    $399.00 DLG-1 dual wideband package with digital gauge
    $479.00 LM-2 deluxe kit with one O2 sensor
    $669.00 LM-2 deluxe kit with two O2 sensors

    Also, please see our guide to installing MS3 on an RX7 for more tips.

  6. whats all needed for me to run this on my LS1 turbo car? please give details im interested in this ECU rather than my stock computer!
  7. 0 votes
    Q whats all needed for me to run this on my LS1 turbo car? please give details im interested in thi...... Read more
    Asked by joshua guzman
    Answered by the admin

    $692.00 MS3X357-C_BL: Assembled Megasquirt-III V3.57 with MS3X
    $99.99 JimStim-C: Assembled JimStim diagnostic board
    $17.00 StimPower: JimStim power supply
    $83.00 MSHarness: 8' main board wiring harness
    $86.00 MS3X-Hrn: 8' MS3X wiring harness
    $22.49 IATwPiggy: Intake Air Temperature Sensor
    $9.49 38NPT-Bung_A: Aluminum bung for IAT sensor (Also available in stainless steel)
    $7.49 MS3TuneCable: USB communications cable for MS3
    $1017.46 Subtotal without wideband

    The wideband oxygen sensor system is optional, but a very useful tuning tool. We carry the Innovate line.

    Wideband Options:

    $189.00 LC-2 without gauge (you can still view real-time AFR and datalog AFR through your laptop)
    $219.00 MTX-L Plus digital gauge system
    $219.00 LC-2 with DB digital gauge (available in red, green, or blue)
    $259.00 LC-2 with G series analog gauge 
    $349.00 LM-2 basic data logger with one sensor 
    $399.00 DLG-1 dual wideband package with digital gauge 
    $479.00 LM-2 deluxe kit with one O2 sensor 
    $669.00 LM-2 deluxe kit with two O2 sensors

  8. would it be capable of running my ford 2.9i v6 12v (bre ) engine with tfi ignition as a dual fuel ( LPG ) engine with both the stock petrol injectors and low impedance lpg injectors ?
  9. 0 votes
    Q would it be capable of running my ford 2.9i v6 12v (bre ) engine with tfi ignition as a dual fuel...... Read more
    Asked by Lennard
    Answered by the admin

    This can run the setup you describe if you use the main board drivers to run the LPG injectors in two banks of three, or if you use external peak and hold drivers to run the LPG injectors sequentially.

  10. Does it work with a 3uz engine double vvti?
  11. 0 votes
    Q Does it work with a 3uz engine double vvti?
    Asked by Mariano
    Answered by the admin

    While an MS3 V3.57 can control the VVTi system on this motor, this engine uses two VR type cam sensors. You'd need an external VR conditioner for the second cam sensor. Stepping up to an MS3Pro EVO will get you extra VR conditioner channels, so you won't need extra modules to run the VVTi.

    In either case, you'll need a cable operated throttle body.

  12. does this ecu come with the software to hook up to my laptop?
  13. 0 votes
    Q does this ecu come with the software to hook up to my laptop?
    Asked by phil
    Answered by the admin

    Please see our Software / Downloads page for where to download tuning software.

  14. I can use with 16v? I have a mustang 351 turbo only drag
  15. 0 votes
    Q I can use with 16v? I have a mustang 351 turbo only drag
    Asked by Marcos
    Answered by the admin

    This system supports almost all ignition systems you could run on a Ford smallblock.

  16. i am doing a 2jzgte vvti into a 99 Lexus gs, really wanting to install the ms3x my tuner knows these things in and out, ihim and i have one discrepncy, wiring! if i purchase a patch harness is there and on that can wire this in for me not to mentions ms3sx works great vvt!
  17. 0 votes
    Q i am doing a 2jzgte vvti into a 99 Lexus gs, really wanting to install the ms3x my tuner knows th...... Read more
    Asked by mina
    Answered by the admin

    You will need wiring for two connectors - the main board connector, which takes a standard MS1 / MS2 / MS3 harness, and separate wiring for the MS3X. We have these harnesses in 8' and 2' lengths, but do not have any application specific harnesses for this particular ECU.

  18. Hi there, I have a uk spec 1985 Toyota Celica Supra with a 5MGE That i am supercharging. Was going to get the DIY pnp 52 KIT, but want a built ecu and seen the SD card Data logging feature on this cuts out the need for a laptop. Would i be able to get a 52 pin denso connector from you & solder the harness leads to that? Oh, and will the start up maps from that diy 52 pnp be transferable onto this?
  19. 0 votes
    Q Hi there, I have a uk spec 1985 Toyota Celica Supra with a 5MGE That i am supercharging. Was goin...... Read more
    Asked by Neil Walker
    Answered by the admin

    You could use our N52 DIYBOB breakout board to make an adapter harness for this ECU.

    The DIYPNP startup map can be loaded into an MS3, although some settings will not load over, and you will need to configure the output pins differently since the MS3 and DIYPNP output ports are not the same.

  20. what is needed to run bmw double vanos system .m50engines
  21. 0 votes
    Q what is needed to run bmw double vanos system .m50engines
    Asked by knut
    Answered by the admin

    Double VANOS solenoids need 12 volt power instead of ground to trigger. You can use our HSD-4 high side driver module for this purpose.

  22. I have a v12 out of a 750il bmw i plan on going turbo and would like to know if this would do it. It has dual distributors already but would like to do coil on plug if possible but if its not possible on this unit thats okay also i know ill have to run batch injection.
  23. 0 votes
    Q I have a v12 out of a 750il bmw i plan on going turbo and would like to know if this would do it....... Read more
    Asked by Brad
    Answered by the admin

    This unit could run wasted spark ignition and semi-sequential fueling. Stepping up to an MS3Pro EVO will allow fully sequential fuel control, although the ignition will still be wasted spark. You could run twelve coils; they'd just be fired in pairs.

  24. How well will it run a series 1 1UZFE, non-VVT-i
  25. 0 votes
    Q How well will it run a series 1 1UZFE, non-VVT-i
    Asked by Zach
    Answered by the admin

    Pretty well - it can run the stock ignition, whether it's coil on plug or the earlier dual distributor version, with the factory sensors. In addition to sequential injection and individual cylinder tuning, this ECU can do boost control, traction control, and many other tuning features.

  26. What are the physical dimensions of the MegaSquirt-III EMS System with MS3X Expansion V3.57 – Assembled Unit?
  27. 0 votes
    Q What are the physical dimensions of the MegaSquirt-III EMS System with MS3X Expansion V3.57 – Ass...... Read more
    Asked by Sean Rao
    Answered by the admin

    6.5" long (including mounting feet), 4" wide, and 2.75" tall.

  28. I have an old chevy 250 engine I am looking at boosting and making it fuel injected with ls coils is what will the computer read for timing it has an bro distributor would it go off of that??
  29. 1 vote
    Q I have an old chevy 250 engine I am looking at boosting and making it fuel injected with ls coils...... Read more
    Asked by Jeffrey Ticer
    Answered by the admin

    If using LS1 coils, I'd recommend using a crank trigger, like the 36-1 trigger wheels we sell. You can make the distributor into a cam sensor by cutting the reluctor wheel down to one tooth.

  30. ms3 msx3 i can use throttel 80mm hemi for a vw mk4 1.8t?
  31. 0 votes
    Q ms3 msx3 i can use throttel 80mm hemi for a vw mk4 1.8t?
    Asked by luis A Ramirez
    Answered by the admin

    You will need to use a cable operated throttle body with this system. The factory Gen III Hemi throttle bodies were drive by wire, but there are some aftermarket throttle bodies out there for this application that use a cable.

  32. What is needed to make this work on. 2001 Lexus IS300, and will it be used as a standalone or piggyback?
  33. 1 vote
    Q What is needed to make this work on. 2001 Lexus IS300, and will it be used as a standalone or pig...... Read more
    Asked by Rick
    Answered by the admin

    You would either need to have the stock ECU control the drive by wire or convert to a cable operated throttle body, and we'd also need to know the transmission details to see if anything is needed there. This ECU does have everything needed to run the engine with the exception of drive by wire; you would just need to add the two wiring harnesses and wire it up. A wideband O2 sensor is also a good idea as it makes tuning the fuel a lot easier.

  34. Is there ANY Difference in Features, Operation, Etc. Between version 3.0 and 3.57 Running MS3X
  35. 0 votes
    Q Is there ANY Difference in Features, Operation, Etc. Between version 3.0 and 3.57 Running MS3X
    Asked by Scott
    Answered by the admin

    There's very little difference. The V3.57 is essentially just a machine assembled V3.0, and they run the same firmware.

  36. Will this work on a first gen MR2 4age?
  37. 0 votes
    Q Will this work on a first gen MR2 4age?
    Asked by Goose
    Answered by the admin

    Yes, these ones use a fairly straightforward distributor, and you can use the "G" sensor to get sequential injection with the stock ignition. Or swap to a later cam angle sensor from a DLI motor if you want more precise triggering.

  38. What 2 harnesses are required to utilize this ecu? Looking to configure it in my rb20det 240sx s13. Tired of the stock ecu
  39. 0 votes
    Q What 2 harnesses are required to utilize this ecu? Looking to configure it in my rb20det 240sx s1...... Read more
    Asked by Anthony Hulbert
    Answered by the admin

    This one has two 37 pin connectors, each needing their own harness. These links will take you to the harnesses needed in 10' length.

    Main board harness

    MS3X harness

  40. Ms3x able to have knocks sensor input it all if what will it need thanks.
  41. 0 votes
    Q Ms3x able to have knocks sensor input it all if what will it need thanks.
    Asked by Daniel
    Answered by the admin

    The best way to get knock input on this unit is with our MS3 Knock Module Kit.

  42. will this work with 2jz 12 tooth crank trigger?
  43. 0 votes
    Q will this work with 2jz 12 tooth crank trigger?
    Asked by kyle
    Answered by the admin

    Yes. This works the same was as the Nippondenso CAS settings in the manual although it has a 12 tooth wheel at crank speed rather than a 24 tooth at cam speed.

  44. Comes with wiring or is it separate?
  45. 0 votes
    Q Comes with wiring or is it separate?
    Asked by luis
    Answered by the admin

    It includes a set of solder cup connectors for making your own harness. We sell flying lead harnesses separately in 10' or 2' lengths depending on whether you want to wire the engine from scratch or make a patch harness. You will need separate harnesses for the main board and MS3X if you go that route.

  46. Will it run a Miata 97 out of the box ?
  47. 0 votes
    Q Will it run a Miata 97 out of the box ?
    Asked by Elior Zeno
    Answered by the admin

    This unit does not need any mods to run this engine; worst case is you may need to adjust the VR trim pots or internal jumpers, but no soldering is required. You'd just need to wire it up and install it. For someone planning to have a shop handle installation, an MSPNP2-MM9697 may be a better deal; the MSPNP is a direct plug and play.

    A VVT swap
    Answered by the admin

    The MS3 has VVT control as well.

    We plan to release an MS3 based MSPNP for these cars soon.

  48. I have a 1987 Ford Mustang, I would like to upgrade to megasquirt but I need to keep it street legal. So does this replace the whole computer and would I still be able to be smog compliant?
  49. 0 votes
    Q I have a 1987 Ford Mustang, I would like to upgrade to megasquirt but I need to keep it street le...... Read more
    Asked by Allen
    Answered by the admin

    This replaces the entire stock ECU. Although it can be tuned to produce good tailpipe readings, it does not make any attempt to keep the factory smog equipment working and is not CARB approved. Consequently, it's sold for unregulated race cars only. Sorry.

  50. Im looking at purchasing a megasquirt for my fzj80 landcrusier running a 1fz-fe engine. I want to convert to coil over plug and run a wide band 02 and turbocharge. What would i need to add to this in order to achieve what i want and how much would shipping be to 3216 victoria austraila
  51. 0 votes
    Q Im looking at purchasing a megasquirt for my fzj80 landcrusier running a 1fz-fe engine. I want to...... Read more
    Asked by Dale
    Answered by the admin

    You'd just need to add our wiring harnesses (both the main board and MS3X), as long as you are using coils with built in ignition modules. A wideband O2 sensor will also be helpful for tuning. The website will calculate shipping once you check out, before you send payment.

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