For carburetor engines, the only conversion that can be done is the mixer system or open loop system

For EFI engines up to around yr 2000, you can choose an open loop system or a close loop system. Both systems still used an emulator controller. The difference with the above two system is basically the closed loop system requires and oxygen sensor. As most fuel injected cars in the Philippines prior to yr 2000 do not come with an oxygen sensor the open system is used. In occassions when there is an oxygen sensor in the can then the closed loop system can be used

The other system mentioned is the multipoint injections system or the "SGI" system. This system directly injects lpg into the engine. This is actually the closest system to fuel injection. This is superior to the open and closed system as there is an ecu that is added to the engine that copies your original injection system. This delivers precise amount of lpg to run your vehicle efficiently. Moreover, there are safety features as well as maintenance features that are included added in this system

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