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/