EG INJECTO DUO is a sequential gas injection system for
cars with 4-cylinder engines with the so-called dual injection system
gasoline, i.e. having both a multi-point indirect (MPI)
as well as direct (DI) gasoline injection.

• The gas is fed to the intake manifold using
  only 4 gas injectors (single gas injector
  supports one cylinder).
• The innovative auto-calibration and mapping algorithm enables
  quick and intuitive system tuning in a way similar to
  calibration of the standard EG INJECTO 48 system, supporting
  direct injection only.
• The oscilloscope built into the controller allows for quick identification
  input signals and verification of the correctness of the performed
  connections.
• The EG INJECTO 90.4 DUO gas injection controller has
  built-in technologically advanced emulators both
  direct injection system and indirect injection system.
• This allows simultaneous emulation of petrol signals
  DI and MPI injectors when the engine is running on gas,
  which in turn translates into very low gasoline consumption.
• When the system is properly tuned when driving on gas
  transitions between changing gasoline injection strategies
  are imperceptible, while maintaining the vehicle's performance
  similar to those when powering the engine with gasoline.