Megasquirt MS3 PNP Alfa romeo 155 Q4

Megasquirt Plug And Play for Alfa Romeo 155 Q4.

Features:

• It maintains all source sensors, including trigger wheel and cam phase sensor installed in the distributor, except for the MAP sensor that is internal.
• Sequential injection, only supports high impedance injectors.
• Original ignition or with sequential ignition option with independent logical coils (type TFSI).
• Anti-lag
• Turbo pressure control by gears. You need to add a speed sensor.
• Although it is not mandatory, it is recommended to change the idle valve for a more modern one with greater resistance in its winding and greater air flow, especially if you want to use anti-lag.

The selection of the ignition option should be correct for what you have the engine installed. The ignition module must be the original one, it cannot be removed or exchanged for another model. The circuit for independent coils is different from that designed for the stock ignition, if selected, the ECU cannot be used with the stock ignition.

When sequential ignition is selected, the ECU is configured to send a 5V signal, so logic ignition coils must be used. Do not use high-current ignition coils; if you wish to use this type of coils, install an amplifier module between the coils and the ECU.

When sequential ignition is selected, the ECU has four ignition outputs, but it can also operate in:

• Distributor ignition
• Wasted spark ignition
• Sequential ignition

It is only necessary to change the ignition configuration to switch between these modes. Never use this type of ignition with the original coils and module; only with logic coils.

Logic ignition output assignment:

• Pin 26 (Spark A): Distributor ignition. Cylinders 1 and 4 with wasted spark ignition. Cylinder 1 in sequential ignition.
• Pin 25 (Spark B): Cylinders 2 and 3 in wasted spark. Cylinder 3 in sequential mode.
• Pin 14 (Spark C): Cylinder 4 in sequential mode.
• Pin 13 (Spark D): Cylinder 2 in sequential mode.

Remember that this configuration is valid only for logic coils. Do not use high-current coils or the original ignition module.

By removing the original ignition module, you must send a signal to the tachometer for it to work. Pin 7 has been reserved for this function. In the tachometer settings in Tuner Studio, you will find the IAC2A output already configured. This pin sends a 12V square wave signal. It has not been tested on all models; it may not work on some tachometers and an external circuit may be required.

In addition to the original functions, it includes:

• 8 auxiliary outputs PWM switching to ground.
• 5 ADC inputs 0 to 5 V
• 6 Switching inputs for Launch control, cut-off, double map, etc ... 
• In the case of selecting the internal barometric pressure sensor, the EXT MAP input is used internally for the connection of the second MAP sensor, so it does not this entry must be used from the rear in this case.

You can consult the installation manual of the Megasquirt MS3 PNP models at the following link:

https://www.piratamotor.com/manuales-y-articulos/articulos-megasquirt/manual-megasquirt-ms3-pnp

It also maintains most features of the MS3 model:

• Connection via USB and RS232, we recommend RS232
• Memory card slot, card not included
• Connectors included
• Basic internal MAP sensor up to 260Kpas (1.6 bar turbo pressure)
• Possibility of internal MAP sensor of 400 Kpas (3 bars of turbo pressure), optional
• Possibility of installing internal MAP sensor for constant barometric correction, optional
• Ground switching outputs.
• ADC inputs for external sensors. Pressure or temperature sensors, EGT (external amplifier circuit needed) etc ...
• Ground switching inputs. Launch control Cut-Off, double map, etc ...
• Load in Speed ??Density (MAP sensor), Alpha-n (TPS position), MAF (flow meter) or mixtures between them
• 16x16 fuel maps and ignition, can be expanded to 16x32 or 32x16
• Maps with variations of 0.1 in the fuel and variations of 0.1 ° for ignition.
• Combination between four 16 x 16 fuel maps and ignition on different types of fuel and cargo, alpha-n, speed density, MAF, etc.
• Eight 5 x 5 fuel maps and eight 5 x 5 ignition maps, to correct fuel and ignition variations between cylinders
• Start of injection from 0º to 720º fixed or variable by 12 x 12 map
• Two 8 x 8 Turbo pressure maps
• Two different fuel maps, ignition and Boost Control, via switch
• Closed loop control of air / fuel mixture
• Closed-loop control of Turbo pressure control.
• Closed loop idle control.
• 2D or 3D maps for programmable outputs.
• Traction control
• Launch fixed or variable control
• Map to adjust the methanol pump by PWM
• Adjustable Turbo pressure control by potentiometer, speed or even gears
• Anti-lag
• Alternator control
• Continuous and On-Off Variable Distributions
• Shift Cut with independent programmable times for 6 gears, for sequential boxes
• Free download adjustment program
• Free download data acquisition program
• Test mode to check the operation of all outputs with the engine stopped, fuel pump, injectors, coils, valves and solenoids, etc ...
• Many more features

Some features may not work together. Some features may require additional circuits.

No unit is shipped with a map of the finished engine, all of them need an adjustment to the engine in which they are installed, especially when there are modifications. In fact, this is what is sought when installing one of our units, adjusting the engine to its modifications or managing systems that would not be possible with the origen unit. Of course this costs more time, but the results are usually better.