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post #1 of 4 (permalink) Old 01-26-03, 07:42 PM Thread Starter
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Fuel Question

My EF is Dual Fuel and i'm assuming would be better tuned to Gas rather then petrol, now i know the EF 6 has a knock sensor so that higher octane fuels are detected, but what i was wondering is, since the engine would be tuned for the Gas, which is Higher octane then ULP/PULP.
Would it mean that my engine would be better suited to PULP then ULP?


1995 EF II Falcon GLi: Heritage Green, 4spd Auto, AUII 17" Rims, Custom BA Front Bar, Lowered, Gas Research LPG, Clear Indicators, JVC MP3 Headunit, Phoenix Gold 6.5" Splits, Coustic 481QE Amp, Clarion 12" sub, Leather Seats, Power Window Conversion, 3.45 LSD, Pacemaker Comp Extractors, 2.5" Exhaust, Mandrel Bent Intake, High Flow Filter, Wade 1004 110 cam.

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post #2 of 4 (permalink) Old 01-27-03, 12:13 AM Thread Starter
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i guess no one has any ideas, i might just have to try it one day..

1995 EF II Falcon GLi: Heritage Green, 4spd Auto, AUII 17" Rims, Custom BA Front Bar, Lowered, Gas Research LPG, Clear Indicators, JVC MP3 Headunit, Phoenix Gold 6.5" Splits, Coustic 481QE Amp, Clarion 12" sub, Leather Seats, Power Window Conversion, 3.45 LSD, Pacemaker Comp Extractors, 2.5" Exhaust, Mandrel Bent Intake, High Flow Filter, Wade 1004 110 cam.

In Progress: BA XR Side Skirts, BA XR Rear bar, BA Shifter Handle.


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post #3 of 4 (permalink) Old 01-27-03, 10:53 AM
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Patience laddy. (Old Scots saying)

I have a duel fuel NF V8 and yes, it runs like a dog on standard ULP. Minimum octane rating to use is around 95. I use caltex vortex (95), runs good. Haven't tried the supa-dupa stuff in it.

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post #4 of 4 (permalink) Old 01-27-03, 01:15 PM
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I've been looking into this a bit lately (as you know ) and my conclusion would be that for the best results, run a high octane petrol (optimax would be the best) occasionally, and also run LPG for the economy it provides, most of the time. Now that you're running all high octane fuels, you should be able to raise engine compression without the risk of knocking (helped of course by the knock sensor as well).

The only problem with this is that it may cost a lot to raise engine compression, and I'm not sure where you could go to get this done. Also the EF engines already run 9.3:1, which seems to me to be far too high to run plain ULP (92 RON, is it? Pretty bloody shit petrol in australia anyway :( ) without the knock senor retarding ignition a lot..

I think what I am trying to get at, is that running the highest octane petrol possible will still be a lower octane than LPG, but should see great results on your car, especially if you've been running ULP so far. Also, running a high octane petrol keeps the engine cleaner and gives better/the same economy because you get that much more bang for your buck (assuming you don't get a heavy foot cause you can feel the power ).

Also, if you're running something like Optimax, theres a voice in my head saying the engine runs better at 14 degrees BTDC than 10 Degrees.. You might want to check up on that one before you try it :)

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