4CYL ECU: AC Stag QBOX Plus OBD

4 CYLINDER LPG CNG ECU Controller: AC STAG QBOX Plus with OBD

QMAX PLUS modern and compact controller  with an advanced feature that allows you to customize the perfect setting autogas in almost every car.
QMAX PLUS is based on the proven controller  of  STAG-4 and STAG-300. It is intended for vehicles with 4-cylinder engines with indirect fuel injection.

Kit contains:

• 4CYL AC STAG QBOX Plus ECU Controller with Wiring Loom
• PS-02 PLUS Pressure Sensor
• Gas Level Sender
• Digital Switch and Buzzer
• Installation Accessories
• Set of manuals, instructions, warranty book and Software CD

QMAX PLUS benefits:
•    auto-adaptation OBD,
•    innovative auto-adaptation ISA 3,
•    support for CAN and K-LINE according with OBD2/EOBD,
•    extended options for reading OBD with auto error canceller,
•    overlap when switching fuel.

32-bit procesor dedicated for automotive
The processor is designed and manufactured only for use in automobiles, features many characteristics flawless use.

Manufacturer’s 5 years guarantee
Security for many years
The longest warranty of product under the STAG, confirming the excellence of the controller.


Universal controller  with a choice of powerful system auto-adaptation.

1. The innovative system auto-adaptation ISA3
ISA 3 is an innovative approach to the auto-adaptation, which should be done after the actual time of gasoline injection with some parameters OBD.
ISA3 is:
• dedicated map correction  independent on the correction turns injection time,
• collection of accurate reference card petrol injection time, taking into account the temperature of the engine,
• recognition modes of closed and open loop in real time
• view the oxygen sensor  signal from OBD of the vehicle.

2. Auto-adaptation OBD
Auto-adaptation OBD guarantees gas injection, exactly suited to the operating conditions and engine load. Influence on the composition of the mixture not only has information about the time of injection of gasoline, but also the modification in accordance with correction current gasoline unit.

3. Automatic OBD error canceller
Automatic OBD error canceller provides deletion of selected malfunctions OBD, without the need of connecting external devices.