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Generations of LPG Conversion kits

1st Generation

Single point gas injection (open loop).This is the simplest to install, the most basic and easily adjusted.\This is an early of gas system that is used on vehicles that have no catalytic converter or oxygen sensor in the exhaust system. Open loop means there is no electronic control. The only electrical connections required are petrol / LPG change over switch, and wiring of the solenoids. This system is only suitable for carburettor and early fuel injection vehicles. Drawbacks include power loss of up to 15% and risk of back fire through the air intake system which may cause damage to both air inlet manifolds and air box. This system is only suitable for carburettor and early fuel injection vehicles.

2nd Generation

Single point gas injection (closed loop). This type of system is basically the same as above but is controlled by an electronic ECU (Electronic Control Unit) feedback system that takes its readings from the oxygen sensor in the exhaust, the TPS (Throttle Position Sensor) and RPM. Although it is huge improvement on the open loop system it still suffers from the same drawbacks but emissions and fuel economy are significantly improved. This system is suitable for most fuel injected engines with catalytic converters. Drawbacks include power loss of up to 10% and a risk of a back fire through the air intake system which may cause damage to the: air inlet manifold, air box, map sensor, and air flow meter. The amount of control varies depends on the choice of manufacturer some give more "steps" than others. This type is usually adjusted at idle.

3rd Generation

Multipoint gas injection At this point the controller complexity increases, depending on the level of sophistication, user set up is practically nil. Simpler units "fool" the engine management system, and the more complex ones integrate with the engine management system and use the data it provides to control the LPG injectors. This type of system is suitable for the vast majority of vehicles and offers superb performance and reliability coupled with none of the drawbacks of the single point injection systems and is definitely one of the systems that you should consider. This system comes as a vehicle specific kit and uses a gas control system programmed with a fuel map for that vehicle and no other. This system is suitable for most fuel injected engines with catalytic converters.

4th Generation

Multipoint sequential gas injection. This state-of-the-art gas fuel injection system is the best way to make newer vehicles with complex engine management systems run correctly on gas with none of the drawbacks of the single point injection systems and is definitely one of the systems that you should consider. This system can be fitted to most fuel injected vehicles with a catalytic converter. The system is similar to the multi point above but instead of injecting fuel simultaneously to all the cylinders, it fuels sequential following the vehicles original fuelling cycle. The gas computer takes the readings it needs to run the gas injection, from the petrol injection system, the vehicle always thinks that it is running on petrol hence any deviation in fuel mixture is compensated for by the original petrol management system, and the signal sent to the original petrol injectors is intercepted and used to fire the gas injectors via the gas computer. Performance and driving characteristics are almost identical to petrol. This system is suitable for most fuel injected engines with catalytic converters.

5th Generation

Multipoint Sequential LPG Liquid injection. Currently this method injects liquid LPG into the manifold just prior to the air inlet valves, and relies on the heat from the enhine to vapourise the LPG. This method is rather more expensive than injecting the LPG in to the manifold as a gas, the aim of LPG componet manufactures is to do away with the petrol injectors and to be able to replace them with LPG injectors, thus inecting the LPG directly into the cylinder. Not very common.

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