LPG - Pros V Cons

[commsirac]

BBQ gas is better than pump LPG - Correct. BBQ gas has a higher propane level and hence has a higher energy rating than typical pump LPG. Pump LPG tends to have a higher propane level during the winter months because it's colder and the propane prevents the LPG freezing in the lines when it's cold. If you do get a chance to fill up on BBQ gas, GO for it. You'll get more performance out of your car.

Good points in your post ^ earcruiser, but this part is not quite right.

Propane has a higher octane rating, not a higher energy rating. The higher octane rating (RON) is really only a consideration if building a motor with compression ratio of > 11:1 to ensure that the RON is always high enough, this cant be guaranteed on pump lpg mix, but even a 50/50 mix of butane/propane has a RON that exceeds premium unleaded anyway.
So more power can be developed out of propane if the motor is rebuilt and slightly more if timing adjustments are made in conventional motors.
Otherwise, the car will travel less distance on a litre of propane than a litre of butane/propane mix.
Butane wont freeze in the lines of the car, its freezing point is way lower than anything experienced in this country. Higher levels of propane may be added due to the butane being less likely to vaporise easily at low temperature, though I wasnt aware this was industry practice in the winter months.
This is one reason why domestic supplies of gas have no or low butane as in cold conditions there is not enough vaporisation pressure from the butane to get it out of the tank and the resulting change in mixture that occurs can play havoc with the CO emissions that are produced inside the home.

 

[levymetal]

lol calm down.... and as for people like me being allowed in the trade, i quit cause i got sick of playing with gas.... it was also four years ago and i stand by what i said.... why spend 2500 for a gas system to save on fuel when its going to switch to petrol as soon as u put your foot down, defeats the whole ****ing purpose doesnt it !

well that's why they are developing more and more systems which can handle higher performance. it appears that it's only the injectors that are having trouble on svi, but lpgli can support much more performance. on a normal car it would never switch anyway so most people wouldn't have to worry. there is still a point to lpg though even if it does do that. how often are you putting your foot down (to the floor)? 1% of the time? so it's still on gas 99% of the time, costing you half as much to run. and of course, the performance loss isn't an issue in that 99% of the time because you're not putting your foot flat. then again we are talking about lpg injection, where svi yields the same power as petrol an lpgli yields more anyway.

commsirac is right though. why do i keep trying to convert people? don't get gas, it's gay, stay away from it.

 

[vxcalais_01]

I stear away from gas. All the mechanics i know too dont have any gas cars (except for one who only has gas because his dad got gas in that car ages ago). That guy hates it too, it's all been tuned but doesn't have anywhere as much power as what it can have.

LOL, i also like having the option of choosing from a few different spark plugs Instead of the one LPG type. And yea, my supercharged VY isn't gong on gas for anything I get enough fuel economy, i can go from Sydney to Melbourne on one tank with fuel leftover And yes, that was with the 125km of roadworks stretch on the bloddy hume in NSW! >_<

Alien on the spark plugs i have to disagree. Best plugs to run are standard gap standard plugs. I spoken to a few ignition specialist including ICE, and they have told me the standard heat range is already cold enough, but gap accordingly. Smaller gap does give some reliability, protect from backfire, but run the standard 1.5mm if you dont have issues. I tried 1.3mm car ran well but slightly weaker on acceleration under load. 1.5mm no issues. Small spark is a weak spark. Then longer the spark the better. If leads and coils are fine then spark would be efficient. You dont need thicker leads, only stainless steel with reduced resistance. MOst are 7mm (Bosch, Scorcher etc.) If you really want increased stronger spark use non resistor plug, but do your research before doing so.


ALso if you looking for good LPG, go to Supagas and fill up from their 100% propane pump. Same price and normal, its the optimax version of lpg.

 

[Ando227]

Wow. I got to commsirac's last statement and stoped reading.

My 3.8l Auto EFI VN runs and Gas & Pet... Now the cost of the pet compaired to the gas is huge! especially on the coast. So I love paying between $30 - $50 (depending on where you are) to fill up the gas and drive for 400 - 500km's. Good value if you ask me.

As for power, I've only had the car for about 6-7 weeks and i've found that mine isn't as gutless as a ford gas/pet falcon... I'm yet to actually REALLY feel the difference.

Just switching over from gas to fuel or fuel to gas can be a pain... have to be quick on the switch and give it a few revs to get a quick change over, otherwise the car dies. lol

But I'm all for gas!