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post #1 of 16 (permalink) Old 04-29-04, 12:14 AM Thread Starter
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Impco

Hey guy's, i read somewhere that Impco LPG systems are regarded as the best in their class. Does anyone here have an Impco system installed on their falcon?

What i want to do is run my EF Fairmont Ghia on LPG i don't mind if it's straight gas or duel, but i do mind if duel fuel is not as good a straight gas, i'v heard duel fuel isn't as efficient as straight, but i have no idea whether it's true or not. If straight gas is the better way to go, do u know if Impco have a straight gas system? Can anybody shed some light on these ideas? Thank's

Bren.

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post #2 of 16 (permalink) Old 04-29-04, 03:31 AM
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Re: Impco

I run an impco LPG system on my 351 XD. Its not bad kit at all, but i'm sorry to say that gas research is the class leader in LPG systems. I'm saving up for a dual gas research system at the moment.

As far as an EF Fairmont goes a dual fuel system will always be a comromise over a single fuel system, but if you want to be able to tune a straight gas system in an efi car you'll need a chip of some description to change the timing correctly, which adds another $1000 or so to the price.

Hope this helps.

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post #3 of 16 (permalink) Old 04-29-04, 10:07 PM Thread Starter
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Re: Impco

Yea thanx that help's alot.

I have a rough idea on why the duel fuel isn't the best? I know with carby motors they rely on a rod through the centre, how does EFI work? But could you give me a few tips on that? cheers.

Basically i need to find the nearest Gas research dealer to me and query them on prices now then ay?
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post #4 of 16 (permalink) Old 04-29-04, 11:42 PM
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Re: Impco

With newer cars, dual fuel is not as much as a problem as it was before due to the fact you can have 2 different ignition maps running, 1 for petrol and 1 for lpg when either is selected, which is where MOST of the inefficiencies lie.

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post #5 of 16 (permalink) Old 04-29-04, 11:44 PM
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Re: Impco

Dual fuel is often refered to as dual compromise. Because the 2 fuels need different cams and ignition timing there is no way to tune both optimally at the same time.

One or the other allows it to be tuned correctly, but as I said to do this with an EFI car you'll need a piggyback computer.

There is an installer directory on the GRA website http://www.gasresearch.com.au

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post #6 of 16 (permalink) Old 04-29-04, 11:52 PM
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Re: Impco

Im doing a straight gas setup as well on my 4.1.
From what I gather, Gas Research seem to be the leaders although the Impco products get better fuel economy (from what ive been told, please point out if im wrong).

I called Gas Research and I was quoted around $440 for a 480cfm gas throttle body. I rekon you can find a better 2nd hand deal though.

Good luck with your system.
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post #7 of 16 (permalink) Old 04-30-04, 12:09 AM
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Re: Impco

hrmm... GRA have obviously been doing some more research... previously 440cfm was the largest single trottle body flow available.

I've got a 400cfm carby here which was on a home turbod non intercooled 4.1. It ran mid 13's (according to g-tech)

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post #8 of 16 (permalink) Old 04-30-04, 12:14 AM
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Re: Impco

Dual fuel is also a compromise because gas likes a higher C/R.

Rick.

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post #9 of 16 (permalink) Old 08-10-04, 03:48 AM
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Re: Impco

When you switch back to petrol (on dual fuel) is it exactly the same power pre conversion? Is there any tuning compromises in the conversion or obstruction with the air flow from the gas throttle body/converter?
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post #10 of 16 (permalink) Old 08-11-04, 05:12 AM
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Re: Impco

As you have noted the restriction in the intake is the only reason you should loose power. The factory AU dual fuel setups have one of the most restictive throttle bodies i've ever seen, soley caused by the gas mixer.

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