Lpg
- Thread starter stradaman
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lozcb
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As an everday driver it would make good practicable sense and very cost effective ,between them mine do less than 8000 a year hard to justify the conversion cost if its still around the £1600 mark , whats LPG in the Uk now
regards loz
lozcb
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Could quite easily see history repeating it self here, i can remember when diesel was the fuel to go for economy wise , once the diesel ownership has risen dramatically they increased the prices to well above that of petrol , same with the north see gas con , once everyone had been converted up went the price to above that of electricity ................cynic am i
regards loz
Fat Arnie
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The trouble with LPG conversions is that they are not well mapped.
The fuelling and timing maps (not to mention enrichment for altitude and temperature) are things manufacturers spend millions developing to get right. A bloke with an exhaust gas analyser who developed a map driving the car around Norfolk does not achieve the same. For any sort of performance cars. steer clear.
The fuelling and timing maps (not to mention enrichment for altitude and temperature) are things manufacturers spend millions developing to get right. A bloke with an exhaust gas analyser who developed a map driving the car around Norfolk does not achieve the same. For any sort of performance cars. steer clear.
stradaman
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What a load of rubbish!
Modern ECU's are mapped to use the poorest possible fuel, so they adjust the map, to suit the fuel. With standard map, its all a compromise. With a full performance map, it needs high octane.
LPG is around 103 octane, runs cleaner then petrol, and so the mapping can be adjusted, even more!
There are loads of peformance V8's, that have run over 100k, with no issues on lpg. Infact, tests have shown, with heads removed, how remarkably clean, the head, rings and bores are.
Cleaner fuel, cleaner engine! And because of the high octane, a bit more power. My S6, remapped for Lpg, made an extra 12 bhp, over 98 octane petrol. I had to add an additive to petrol, to increase octane.
Its only an alternative fuel. It works fine, engine runs quieter, no smelly exhaust.
Andy.
Fat Arnie
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Andy, Where does the LPG conversion get its readings from TPS etc from then?
Lets face it, LPG conversions are a bunch of rubber hoses squirting gas into almost randomly positioned unions in the inlet manifold. It is not in any way a technical approach on a par with a modern electronic injection system.
Lets face it, LPG conversions are a bunch of rubber hoses squirting gas into almost randomly positioned unions in the inlet manifold. It is not in any way a technical approach on a par with a modern electronic injection system.
I thought you get less power and slightly lower mpg figure with LPG??
Shame they don't have a conversion for diesel engine, just changed the X5 to a diesel one!
drellis
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have to say my saab aero hot 250bhp seems the same whether on petrol or lpg, the old lpg systems used a mixer and were a compromise, the system i have on can cover up to 350bhp on four cylinders, if i changed the turbo and uprated the cooling. for the next family wagon i may risk a leggy quattroporte and lpg it
stradaman
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Mpg, is slightly lower, due to flame shape. Power is either same, or slightly more. Was on S6, before mapping, and certainly, after.
There will be a Diesel LPG. Currently, undegoing tests.
As for LPG being fitted and readings.Modern LPG systems, are fully sequential, and use the petrol signal to control the LPG injectors. There is also an extra knock sensor fitted. So with LPG, its running, as though on petrol.
Injectors are usually banked, or put as close to original injectors, as possible. It is no different to a modern injection system.
Andy.