Megasquirt 3 wiring diagram

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For each individual model there is a model-specific addendum to this documentation which addresses the particular installation needs and other unique features of each model of MSPNP2 EMS. You now have the power to fully unleash all of the potential of your engine both with your current configuration and with any modifications you'll perform in the future, no matter how extreme you want to take it!

It is designed to plug right into the factory harness where the factory ECU used to be, and if your engine is pretty close to stock, will easily start your engine just like the factory computer did. You will, however, want to fine-tune your MSPNP2 in order to get the most out of your car's potential.

After all, this ability to tune the fuel and spark maps to match your engine is what a standalone EMS is all about. For the majority of you, we've packed all the features you'll ever need right into the core of the unit and you'll likely never care to modify anything. We didn't stop with the base feature set of the MegaSquirt but improved upon it. Some of these are built in and use your existing harness, while others require a few changes to the wiring to access since your factory harness didn't support these features.

You can set the rev limiter anywhere you want it, and choose either spark cut or fuel cut based rev limiting on most MSPNP2 applications. While most of the warnings will appear in the text discussing what the warning is about, there are a few words of caution before you start installing your MSPNP2.

First, the MSPNP2 is designed for racing applications and other cars that do not need to be emissions legal. It does not use many of the OEM emissions control devices on the engine, nor is its base map tuning calibrated to pass an emissions test. Then again, neither are most stock ECUs.

It's designed to be put in the passenger compartment, not under the hood or in places where it will get rained or splashed on. We have thoroughly tested the MSPNP2 on multiple cars, and the 'base map' tuning should get a stock engine or a mildly modified engine running with no problem. However if you are using this on a modified engine, the tuning may need significant adjustment to properly run your engine.

You'll want to dial in the settings before you really push the engine hard. Engines with significant modifications such as those requiring larger injectors may need several settings changed before they will start at all though setting it up for larger injectors is easy, and covered in this manual. Even if your car is stock, you'll still need to fine tune the base map for your car to ensure your car is safely tuned as all cars are different.

You do not want to damage your engine due to assuming the base map is just fine for your car.

9-29-12 how is Megasquirt wired into a car

It's close, but don't assume it's perfect. As a general rule, it will work with almost any modification that works with the stock ECU, and many others that would not have. Attempting to do so may result in unpredictable results, or may simply not work at all and could prevent the MSPNP2 from running your car properly.

As long as you are using the factory ignition system, you can add pretty much any modifications available as long as you tune the MSPNP2 to work with them. More details on this below. It calculates the amount of fuel to inject based on RPM and manifold pressure. The MSPNP2 uses a 4 bar MAP sensor that can handle up to 44 psi of boost if you've turbocharged or supercharged your engine, though if you're not running forced induction you're still just fine with this sensor.

It just allows for the big plans you may have down the road. The settings and table values depicted within this document are for illustration purposes only. Refer to the included base maps for the initial settings and values necessary for your application. This thumbdrive contains tuning and analytical software, firmware, base maps, installation guides, and reference manuals.

Furthermore, it should go without saying that the included documentation should be read, reviewed, and understood before they physical installation of your ECU begins. To begin, plug the thumbdrive into your computer. It should run automatically, but if it doesn't, browse to the thumbdrive's directory and run the file that includes the model number of your ECU followed by the word "Setup".

If you are presented with a dialog asking if you want to allow this application to run, choose "YES". From there, read and follow the prompts as they are presented. When presented with the option to select components, ensure that all check boxes are checked or that "Full Installation" is selected.It has 8 fuel and 8 logic spark outputs offering full sequential fuel and spark for hi-z injectors and logic level coil-on-plug coils or high-current coils with suitable external ignition module.

This supports full-sequential on a V8 or semi-sequential with wasted spark on a V Switch inputs for launch, idle-up, nitrous-in etc.

On-board SD-card datalogging allows fast datalogging without the need for a laptop while logging. Built-in USB-serial adapter eases connection to modern laptops.

CAN communication ability to interface with extender boards for more inputs and outputs on the more complex installs — e.

Calibration to adapt to OEM temperature sensors is straightforward and numerous wideband calibrations are supported. Initial setup is aided by test modes for the fuel and spark and by built-in tooth loggers to help diagnose incoming tach signals. Vehicle speed sensing, logging of EGT with external hardware. It requires little or no DIY effort inside. Other Megasquirt options are far more DIY intensive.

This gives all the software features of the full Megasquirt-3 but does not include the driver board to support 8 channel fuel and spark, relay outputs or switch or analogue inputs.

This option may be of use to the more DIY orientated user who wants to add their own options or as an upgrade from Megasquirt-1 or Megasquirt MS Complete: MegaSquirt 3.Click image for full-size version. Note that some wire colors may change over time ex. Always verify the pin number for any connection. Where is my engine's setup? Is it emission legal? What do the version numbers mean? How can I find my code version? What is 'tuning'? What about automatic transmissions? How can I find out more?

Where can I ask questions? Is there a PDF of the manual? How do I purchase? How does it work? Can I do sequential injection? What other hardware is there? What do I need? Can I buy an assembled unit? What if I can't get it to work? What if I need ignition control? Is there a simpler piggyback version? What You Need Where to Purchase?

Support Forums MSefi. Sensor Air Temp. This connects to a switched 12 Volt supply. Second ignition input signal Input 2 for a cam position sensor or second crank sensor with the Dual Spark option. For more info, see: vr. It is used for alternate MAF pin or knock sensing, but it can be used to record whatever Volt signal is put on it if neither the MAF option nor the knock option uses it. In this case it is stored in outpc. This output controls a fuel pump relay by providing a ground when the fuel pump should be running.

Microsquirt Wiring Diagram

It cannot control a fuel pump directly. This pin connects to the injectors. These connect to one pin on each connector. Note that low impedance injectors DC resistance less then 10 Ohms require current limiting resistors, see: Injector Resistors. This pin is used to receive data from the laptop computer serial port usually a DB9 or DB This pin is grounded to enter bootloader mode, which allows you to update the embedded code in MicroSquirt.

You can connect this lead to a switch, with the other side of the switch connected to ground.If you are using other code, please refer to the assembly instructions that go with your code. As a result, while you should verify that you have received all you ordered, it is not necessary to identify each item by color, markings, etc. If you have questions about the specification or appearance of any item, check the part number at the Digi-Key site www. Entering the part number in their search engine will give you access to both the catalog information and the data sheet from the manufacturer.

To assemble any of these electronic kits, you will need a soldering iron, some solder, and a few other useful accessories. A 15 watt pencil iron will work fine, however a 25 watt iron heats up faster. Get some small solder. For example, you can use 0. You do not need to use silver solder for MegaSquirt.

Make sure to let the soldering iron get hot before using it. A hotter tip makes for quicker cleaner joints, and less heat in the components, because the temperature of the lead reaches the melting point of the solder before the component has had much time to heat up though letting the iron heat for a while also tends to shorten the useful life of the tip.

Let it sit 'powered-up' for minutes before trying to use it. The solder should melt nearly instantly if touched to the tip. Never try to paste solder on a joint using excess solder on the tip. Keep the tip clean, and heat the joint try to get the tip right at the joint between the lead and the PCB and hold the solder against the other side of the joint until it starts to melt. Feed in just enough solder to get a bit of a cone on the joint, and you are done. Get a solder wick as well - you will be glad you did!

It is very useful for removing components. Before plugging in your soldering iron, be sure you read and understand the assembly instructions that follow. Note that there is also an excellent tutorial for the assembly of general electronic kits here: www. To reduce the potential for damage from ESD, some care is needed. Where possible, make use of anti-static controls and material handling techniques, i. Avoid handling semiconductor components more than necessary.

Manuals for Megasquirt-3

If you are not wearing a wrist-band grounding strap, discharge yourself by touching grounded metal before handling ICs and equipment. This is especially important in the winter after taking off or putting on any garments, for example, sweaters and coats.

The material of your clothing also has an effect, as materials like silk and some artificial fibers produce a lot of "static electricity". Most commercial carpets contain a high percentage of artificial fibers, which are prone to producing static. These components are installed on the silkscreen side of the PCB, and in most case it will be easiest to solder them from the other side of the board.

Electrically, the soldering works fine from either side, but as you get more components on the board, it gets harder to solder on the components side, forcing you to use the other side for soldering. There are three ways you can be sure of putting the right components in the right places with the right orientation.

Most electronic parts have a standardized scheme for identification. There are a large number of cryptic designations in building a MegaSquirt. Many of these have the form of a capital letter followed by a one or two digit number. So R9 means resistor R number 9. Note that the main board has a R9, as does the stim, and they are different. There are also a number of X jumper locations X1, X2, etc.

These generally specify a location on the board to solder a jumper, if you look at the board with all the components installed you should see a X1, X2, etc They can also have other designations, such as JS4, or JS1.

megasquirt 3 wiring diagram

Finally, there is the component part number, used to order the part from a supplier, and this can be different again.Microsquirt Wiring Diagram — wiring diagram is a simplified agreeable pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the capability and signal contacts amid the devices.


A wiring diagram usually gives assistance roughly the relative incline and pact of devices and terminals on the devices, to back up in building or servicing the device. A pictorial diagram would acquit yourself more detail of the monster appearance, whereas a wiring diagram uses a more figurative notation to bring out interconnections on top of swine appearance. A wiring diagram is often used to troubleshoot problems and to make definite that every the connections have been made and that all is present.

Architectural wiring diagrams conduct yourself the approximate locations and interconnections of receptacles, lighting, and steadfast electrical facilities in a building. Interconnecting wire routes may be shown approximately, where particular receptacles or fixtures must be on a common circuit.

Wiring diagrams use gratifying symbols for wiring devices, usually interchange from those used upon schematic diagrams. The electrical symbols not lonely be in where something is to be installed, but as well as what type of device is being installed. For example, a surface ceiling lively is shown by one symbol, a recessed ceiling fresh has a interchange symbol, and a surface fluorescent fresh has substitute symbol. Each type of switch has a swap symbol and fittingly get the various outlets.

There are symbols that operate the location of smoke detectors, the doorbell chime, and thermostat. A set of wiring diagrams may be required by the electrical inspection authority to approve attachment of the quarters to the public electrical supply system. Wiring diagrams will furthermore tally panel schedules for circuit breaker panelboards, and riser diagrams for special facilities such as flame alarm or closed circuit television or further special services.

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megasquirt 3 wiring diagram

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