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Running straight LPG 

 

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 Post subject: Running straight LPG
Posted: Wed Jan 25, 2006 7:51 pm 
Oompa Loompa
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hi guys
im gettin an EF falc, and im looking to buy a gas research system to run on LPG only.
Ive had a system b4 on a 308 so i know how they work, however with an ex EFI car im a bit confused.
For the falcon's 6, how do u go with regards to the ecu side and functioning the timing e.t.c?? i mean isnt the timing ran by the ecu which is controlled from all the EFI sensors (which will of course all be removed with this setup)
can u retain the ecu to just run the ignition only or something? or even just get a gas only ecu??? are they hard to find and expensive?
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Posted: Wed Jan 25, 2006 8:07 pm 
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they retain all the sensors.

 

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Posted: Wed Jan 25, 2006 8:22 pm 
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by the way, Gas Research (I rang there office that I got the number off the website for sales or whatever) tell me they only offer a duel fuel system for the EF's. Unless your mech is using Gas Research parts to custom make one or something. I dunno why and the bloke had no idea, but he said that it was clearly marked there that they only offer duel fuel for the EF Falcons...

 

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Posted: Wed Jan 25, 2006 8:25 pm 
Oompa Loompa
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yeah i wouldnt buy a system, just make one yourself, very basic....
im just wondering how the rest of the engine functions, so if u unplug the injectors and their part of the loom and dont use it (and just let the gas system run off its own system) the motor will function fine?
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Posted: Wed Jan 25, 2006 8:34 pm 
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GRA dual setup is the same as a straight LPG isntallation.
there is nothing else that could be changed to do it anyway.

if you remove the injectors the engine will still run fine.
the GRA t/b still uses the factory TPS & can be modified to use the idle speed controller.
theres nothing else to be changed.
the rest of the sensors can just be left there untouched.

You can't do anyhting in regards to the ignition timing due to the coil pack setup.

just plug injector holes, remove injectors, hide wiring looms under the manifold so its all neat.

 

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Posted: Wed Jan 25, 2006 10:13 pm 
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will the engine start on straight gas? or do you still need a squirt of petrol to get it goin?
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Posted: Wed Jan 25, 2006 10:33 pm 
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When I got mine converted I got told EFs could only be dual fuel.

Ryan0001 wrote:
will the engine start on straight gas? or do you still need a squirt of petrol to get it goin?


I find that the fuller the tank of gas the easier it starts on LPG. I got told to alwys start it on petrol, tkae it to about 1500-2000 RPM and flick it over. But you can start it on LPG. But its not very good unless you have LPG injectors.
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Posted: Wed Jan 25, 2006 10:35 pm 
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Ryan0001 wrote:
will the engine start on straight gas? or do you still need a squirt of petrol to get it goin?


mine starts on LPG, petrol doesn't even work on my car.
I'm running a GRA system.
takes a few cranks on a cold start, but its fine after that :)

 

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Posted: Wed Jan 25, 2006 10:37 pm 
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twirqurky wrote:
When I got mine converted I got told EFs could only be dual fuel.


tell me the difference between dual fuel and straight LPG.
what i can see:
no petrol system, same mixer, same ECU, same sensors.
and more advanced timing to make the most of the LPG (the only thing u can't actually do on an EF)
so i don't know why they can't do straight LPG.
i think its more of a 'theres no benefit' to removing the petrol system unless you've got an aftermarket ECU that allows you to tune the ignition timing.
but again, in this situation you could potentially run dual timing maps.

 

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RACER - EF Futura , 5.0, 5 Speed
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Posted: Wed Jan 25, 2006 10:42 pm 
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Duel feul still runs petrol injectors on the LPG setup I think.
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Posted: Wed Jan 25, 2006 10:52 pm 
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exactly.... dual fuel just means the petrol system is still there.
there is no reason why that can't be removed.

 

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FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw
DTHWGN - EA GL Wagon, LTD Interior, Satin Black, 5.0, Turbo
RACER - EF Futura , 5.0, 5 Speed
PROJECT - 83 Thunderbird, Lowered, 18" Billet Wheels
DAILY - BA Fairmont Ghia 5.4 3V

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Posted: Wed Jan 25, 2006 11:07 pm 
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twr7cx wrote:
by the way, Gas Research (I rang there office that I got the number off the website for sales or whatever) tell me they only offer a duel fuel system for the EF's. Unless your mech is using Gas Research parts to custom make one or something. I dunno why and the bloke had no idea, but he said that it was clearly marked there that they only offer duel fuel for the EF Falcons...
Strange comment from them as I had an EF gas research system on my old EF v8 and it was straight gas. The Carb system starts fine on Gas only, so there is no reason not to be able to remove the petrol gear.
Cheers
TW

 

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Posted: Wed Jan 25, 2006 11:19 pm 
Oompa Loompa
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def not interested in dual, if i get this system the petrol tank, pump, lines and all of it are coming out to never go back in!
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Posted: Thu Jan 26, 2006 2:04 am 
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EFFalcon wrote:
exactly.... dual fuel just means the petrol system is still there.
there is no reason why that can't be removed.


Not in every case buddy. E.g. mine, even when mine is in LPG mode it still starts on petrol (and then automatically changes to LPG) is I remove my petrol system, car won't start! I'm sure I could however have it set up so when it starts on LPG it actually uses LPG not petrol but.

O, and twason, I presume that the V8 and I6 systems are different!!

 

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Posted: Thu Jan 26, 2006 2:47 am 
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Why would you put a GRA CARBY on it ?

Would you stick a 350 holley on it if gas wasn't cheap ?

May as well, their both about as good as each other at controlling mixtures.
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