Cheap6
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Despite the large amounts of water and vapour lpg combustion creates ? I cant see how they would succesfully run petrol and lpg together, it would run like a dog, and if it was only a small amount, it would vapourise doing crap all. To be able to mix and have either fuel run at certain revs is amazing and would cough and splatter like a dog. There is no way possible to keep them seperate in the combustion chamber or lines when changing over. Cheap6, i thought most lpg systems ran piggyback systems ? How does 1 computer know when different fuels have been changed over ?
Well, that's what they do, whether you think it will work or not. Apparently it's enough to protect the valves.
It's load based, not rpm based and you can add a surprising amount of petrol without causing a rich miss over the stoichiometric LPG. I have on my car a Silicon Chip Nitrous Fuel Controller wired to pulse the petrol injectors, used to assist with starting on LPG. (It was cheaper than an LPG MemCal.) At 13% duty cycle (because that's where it works best) it doesn't cause a miss or stumble if I press the switch while driving.
There is an extra wired added to the PCM to switch between the two maps.