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AC STAG R01 250HP Reducer (inc. Valve - 8mm Inlet)

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2.00 KGS
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  • AC STAG R01 250HP RED (186kW) Reducer (Vaporizer) with 8mm Electrovalve for Turbocharged Engines
  • AC STAG R01 250HP RED (186kW) Reducer (Vaporizer) with 8mm Electrovalve for Turbocharged Engines
£90.79 Inc. VAT


AC STAG R01 250HP RED (186kW) Reducer (Vaporizer) with 8mm Electrovalve for Turbocharged Engines


Technical specification: 

  R01 - 150 HP R02 - 250 HP
Operating pressure (adjustable) [bar]  0,9 to 1,3  1,0 to 1,3
Working temperature [oC] -20 to 120 -20 to 120
Gas inlet connection [mm] M10x1 M12x1
Gas outlet connection [mm] Ø 12 Ø 16
Water inlet/outlet [mm] Ø 16 Ø 16
Negative pressure connection [mm] Ø 4 Ø 4
Dimensions [mm] 100 x 80 100 x 85
Weight [kg] 1,1 1,3














The reducer is designed for Autogas vapor phase sequential injection systems. The reducer vaporizes the liquid petroleum gas supplied to the cylinders. The AC R01 reducer ensures continuous stable pressure while supplying the precise fuel dosage to the gas injectors.

The reducer can be easily fitted in all cars with engines of up to 150 HP (black) or up to 250 HP (red), particularly turbocharged.

The high efficiency and thermal stability of the AC R01 reducer ensure:

  • stable pressure and precise fuel dosage under sudden acceleration and engine load increase,
  • correct gas temperature regardless of driving conditions,
  • correct vaporization of gas, even in uncommonly low ambient temperatures.


LPG systems equipped with the AC R01 reducer work perfectly with the vehicle power transmission system, ensuring trouble-free operation for years.
The reducer works perfectly regardless of LPG parameters, driving style or vehicle load.
The modified version of the AC R01 includes enhanced internal components for the adjustment of exit pressure, which has improved the operational stability of the unit.

The stable working pressure of the AC R01 enables:

  • very smooth and dynamic driving with optimized fuel consumption,
  • steady engine operation,
  • safe and comfortable driving.


The reducer quickly responds to sudden load changes. It provides the correct fuel dosing even at temporary high demand and prevents an excessive pressure rise and engine stuttering at the same time.

Benefits of AC R01 reducers:

  • stable pressure,
  • works excellently with turbocharged engines,
  • tested in all conditions,
  • gas inlet elbow connection Ø12,
  • increased durability,
  • modern construction solutions,
  • small size to allow easier installation in tight engine sections,
  • rotating connections,
  • stable working parameters.


Design of AC R01 reducers
With the use of unique design solutions, the single-stage, diaphragm-type AC R01 with a heat exchange (water/gas), combines the benefits of two types of reducers:

  • single-stage: fast and efficient management of sudden temporary increase in the load,
  • two-stage: no risk of excessive pressure.

The unique design of the AC R01 ensures sufficient performance in both low and high pressure gas inflow. Therefore, the unit is more resistant to pressure drops resulting from a reduced LPG level in the cylinder and fuel impurities than other marketed products.

The use of an innovative heat exchange system in the AC R01 reducer, significantly minimizes the release of LPG impurities which cause “reducer plugging”.
In this respect, the AC R01 is much better and more reliable than other competitive solutions.


Materials used for construction and technical specification

The AC R01 reducer is made of aluminum alloy processed under strict chemical control and the manufacturing technology ensures:

  • tight casting up to 70 bar,
  • uniform formulation of casting to ensure high durability and resistance to mechanical damage

Warranty Information

24 months warranty. Easy swap.
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2 Reviews

  • 5

    Posted by Stuart EDGE on 3rd Feb 2021

    Good quality and same spec as original. All fittings present and "simple" bolt old one off and bolt replacement on! Fitted without issue and all working 100% again. Seems to have solved the issue I was having with poor idling and spurious lights and fault codes coming on randomly. Already changed filters and re-set system a few times trying to solve issue previously.
    Car: 2005 Subaru Outback 3.0 with 155k. LPG fitted nearly 4 years ago at 115k miles.

  • 5
    excellent item and easy swap out

    Posted by Phil on 8th Aug 2016

    After having a online chat I went for this reducer. This is an upgrade from the original Stag version I had and is a straight swP.