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Old 11-10-2003, 21:29   #1 (permalink)
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LPG vs Intercooler

LPG is really cold when it is injected, so it definitly lowers intake temperatures, would there still be a need for an intercooler? or should a decent (200rwkw) turbo kit definitly have an intercooler.

The reason im asking is because im putting a gas only setup on my 4.0l ute soon and and maybe turbocharging it after that.

Also does anyone know anything about water injection, especially in use with gas, this is more just for interests sake.

Thanks in advance.
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Old 11-10-2003, 21:35   #2 (permalink)
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Re: LPG vs Intercooler

where are u gunna get LPG injection from?
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Old 11-11-2003, 00:55   #3 (permalink)
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Re: LPG vs Intercooler

GRA do a kit now dont they?
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Old 11-11-2003, 01:53   #4 (permalink)
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Re: LPG vs Intercooler

i dont think he means injection as in fuel injection, i think he means just "its cold when it is mixed with the air in the intake" please correct me if im wrong turboute.

for 200rwkw i dont think you need an intercooler - from memory CAPA do a supercharger kit that makes about that much power on petrol, and they get away with no cooler and just water injection.

i dont think water injection would be much use for you, but i have no experience with LPG+turbo so dont take my word for it.

you should be right with no cooler i reckon, as you say, gas is very cool as it goes in, so it should have a pretty good intercooler effect.
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Old 11-11-2003, 03:45   #5 (permalink)
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Re: LPG vs Intercooler

Turbocharged cars typically run slightly richer than NA cars and also a lot less advance, the problem with gas is the richer you run the hotter the combustion chamber gets, also the less advance you have the hotter the combustion chamber gets, water injection works excellent on gas, but is a pain having to refill all the time, and if you run out you will destroy your motor in less than a second.

The gas entering an engine is at coolant temperature as it goes through the converter and gets heated, it doesn't provide any cooling effect.

LPGas liquid injection is available, but GRA don't do it. There is a company in WA that makes them, but i don't know there name, sorry.

Intercooling on gas turbo cars is a must, because as the temperature of gas increases its octane rating drops significantly.

I have a turbocharged EA that i have been running straight gas, non intercooled, and no water injection, i had lowered the compression to 7 to 1, fully mapped XE Dizzy to suit and been dyno tuned. I have stuffed two motors now. Why because i never intercooled, and also that you need 30% better spark for gas, you need even better spark for turbocharging and i have found it near impossible to stop it cross firing, and to keep up good spark to plugs.

Speak to GRA, they have done many turbo setups.

I personally am going back to petrol, much safer on your engine.
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Old 11-12-2003, 21:55   #6 (permalink)
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Re: LPG vs Intercooler

Thanks for all the replies, Does anyone know the company in WA that does the Gas injection? I will definitly trying to get in contact with them (Im in WA).
Also, how much water does water injection use? (aprox l/100km)
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Old 11-12-2003, 23:51   #7 (permalink)
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Re: LPG vs Intercooler

Water injection is not supposed to be used on cruise, but as an anti detonate at full throttle, you adjust the amount to the motors individual needs.
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Old 11-13-2003, 13:28   #8 (permalink)
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Re: LPG vs Intercooler

There's a bunch in Kewdale. RAC recommends them. I can't remeber their name of the top of my head. When I was looking at an XE 351 on gas they mentioned a blokes Fairlane they'd just done making 260 RWKW on straight gas. Obviously had a lot of money thrown at it, given they're getting 450 odd horsepower at the flywheel, but I was pretty impressed.

Give RAC a call or call Rick's Autogas in Oconnor, they seem to do a decent trade and have done plenty of performance work.
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