vy economy on gas

[steve40]

Gday all I posted in another thread that I got 03 vy put on gas using the ramano injection system and it runs great but i was getting around 420km out a tank(70lts)of gas which I did not think was alot so It was suggested I take back to be retuned which I did and the installer said thats as good as will get but I have heard from other people that they are getting 500 plus from a tank, short of spending $150 on new leads and plugs to save a couple of dollars per tank any one have any ideas as I do not drive hard and does not seem to make any difference with city or country driving.
I suppose I should not complain that much it is still cheaper to run than petrol

[VT97CALAIS]

My VT Calais 1997 mdl is on dual fuel - mixer type Impco brand

get on average about 17-18 litres per 100km LPG consumption.
Best I have ever managed is like 366km out of 52.93 litres of LPG
But recently, 333km out of 65.31 litres, pretty thirsty lol hehe!
Basically costs me 35-40 bucks every 2 weeks

[Flat_White]

420km per tank is excellent fuel efficiency for gas!!!

people using mixer systems get like 250km per 70L!!

[rokkz]

Have the Tartarini Injected system on V6 VYII Berlina

My second light just went out on the way home
with 340km on the clock (approximately over 1/2 a tank)

I always get between 640-720km using 71lt of autogas( & 4-5lt of petrol at startup 1klm coldstart).
$47 in total to fill up autogas and petrol
That’s 60% highway 40% freeway mostly Werribee to Airport West in peek.
My lowest was 580km, and that was running 10% rich, before the
First service and retunned.

Using 5W30 Syn Castrol Edge, Bosch Sport Leads, Standard NGK plugs.
Tried 1.3 Bosch platinum plugs but got but performance wasn't as good
and gas usage increase. Also tried supagas 100% propane, however economy
was worse and later found out the right mix of butane is beneficial.

One thing noticeable is gas consumption increased more than motor spirit
under heavy acceleration.

Cheers

[Tilvywgn]

Gidday,

I have a mixer system Sprint Gas installed few month ago on my VY I Berlina Wagon and getting a fuel economy of 12.5 -13 l gas / 100 kilometres. It's spot on what my installer said it would be: 10-20% more than petrol. The Sprint Gas donut tank has a capacity of 60 litres, but you can only fill it up to a maximum of 52 litres, then the safety valve cuts in and shuts off the pump (supposedly to cut off at 80% capacity full because gas expands depending on temperature, but 80% would be 48 litres but I can put 52l in...wonder why at times...) . anyway so, Im getting 400 k's out of 52 litres roughly. I live out of town sort of, and of the 400 k's I do per tank a quarter (100 k's) is stop and go 'town' traffic. Im NOT putting down the foot excessively but sure not drive slowly. Im yet to be convinced that an injection system will deliver superior fuel economy: not because my system isnt injected but reading other peoples figures here. 17-18 litres /100 k's sounds quite excessive, then again, you really might be flooring it hard and often. 250 k's out of 70l and I 'd be going back to my installer straight away.. obviously not right..
This is my second commodore on gas - had a blue 3.3l VH wagon a few years ago and was going through 17 odd litres gas / 100ks, obviously mixer setup, too, but an 81 model straight 6...
My experience is to get the car tuned properly and you will get good savings out of a gas conversion.
On another note: the downside is getting only 400k's out of a tank means filling up more often and you wont have dash integration with the SPRINT gas system, but: when I first had my car I was p***ed off at not being able to have an accurate reading of my fuel consumption in the dash windows. Then I pulled up at the petrol station and filled up for 32 dollars... :-)

[Flat_White]

Gidday,

I have a mixer system Sprint Gas installed few month ago on my VY I Berlina Wagon and getting a fuel economy of 12.5 -13 l gas / 100 kilometres. It's spot on what my installer said it would be: 10-20% more than petrol. The Sprint Gas donut tank has a capacity of 60 litres, but you can only fill it up to a maximum of 52 litres, then the safety valve cuts in and shuts off the pump (supposedly to cut off at 80% capacity full because gas expands depending on temperature, but 80% would be 48 litres but I can put 52l in...wonder why at times...) . anyway so, Im getting 400 k's out of 52 litres roughly. I live out of town sort of, and of the 400 k's I do per tank a quarter (100 k's) is stop and go 'town' traffic. Im NOT putting down the foot excessively but sure not drive slowly. Im yet to be convinced that an injection system will deliver superior fuel economy: not because my system isnt injected but reading other peoples figures here. 17-18 litres /100 k's sounds quite excessive, then again, you really might be flooring it hard and often. 250 k's out of 70l and I 'd be going back to my installer straight away.. obviously not right..
This is my second commodore on gas - had a blue 3.3l VH wagon a few years ago and was going through 17 odd litres gas / 100ks, obviously mixer setup, too, but an 81 model straight 6...
My experience is to get the car tuned properly and you will get good savings out of a gas conversion.
On another note: the downside is getting only 400k's out of a tank means filling up more often and you wont have dash integration with the SPRINT gas system, but: when I first had my car I was p***ed off at not being able to have an accurate reading of my fuel consumption in the dash windows. Then I pulled up at the petrol station and filled up for 32 dollars... :-)

Mate, just wondering if you have had any problems with your gas system since you got it installed??? do you have a valve-saver drip-lube system installed? did they have to do anything with your traction control (my installer is charging me 50dollars to disable it) and how much was your conversion?

[Tilvywgn]

You're right, traction control wont work on gas. But I cant see why turning it off would cost extra. My installer told me it wont work unless you flick the switch and run it on petrol, which is another downside I have to say.. to some respect, anyway... then again, never had traction control b4...
I ve had no problems with my installation. Had to put it in for a couple days to have it all done and then come back after 2000 k's for a once only free post installation checkup. I ve paid $3100 all up and got $2000 back from government. My installer did not advise on a valve saver system and I havent got one: he did not have one on his own private 99 vt commodore on gas he showed me with the same gas system on it. I dont know much about it if you need it or not, I know my old commie didnt have one neither and never faulted.. My 03 Berlina has done 107k's and tested perfectly fine. I think I wont bother with the drip lube system.

[Flat_White]

thanks for your advice... can anyone else shed some light on the traction control charge? is it justifiable?

also, my SPRINT gas conversion is 3000dollars (and i get 3k rebate) so its basically free.

[commsirac]

Gday all I posted in another thread that I got 03 vy put on gas using the ramano injection system and it runs great but i was getting around 420km out a tank(70lts)of gas which I did not think was alot so It was suggested I take back to be retuned which I did and the installer said thats as good as will get but I have heard from other people that they are getting 500 plus from a tank, short of spending $150 on new leads and plugs to save a couple of dollars per tank any one have any ideas as I do not drive hard and does not seem to make any difference with city or country driving.
I suppose I should not complain that much it is still cheaper to run than petrol

There is no reason why you shouldnt at least be able to achieve the consumption figures for the fact impco conversion, which are ~9L/100km highway, 15L/100km city and about the same for the injected system on the VE. I have found these quite on the mark for my VX with fact system.

City consumption of course is difficult to compare. However, highway figures should easily be achievable at a constant 100km/h.

There is clearly something wrong if your highway consumption and city consumption are equal, unless your city consumption is just at a constant 60km/h.

New plugs may help if the old ones are worn, but unless its misfiring, new leads will do diddly squat.

[steve40]

Thank for all the replies there seems to many different opinions on what the consuption should be i suppose a lot of depeneds on driving conditions,loads,the nut behind the wheel,age of the motor(mine has only done 115.000km)as i said I don,t want to spend and commsirac said as well $100's buying new leads and plugs when there is nothing wrong with them to save a few dollars at the bowser maybe I will replace the air filter.

[rokkz]

Mate, just wondering if you have had any problems with your gas system since you got it installed??? do you have a valve-saver drip-lube system installed? did they have to do anything with your traction control (my installer is charging me 50dollars to disable it) and how much was your conversion?

For injected Gas, there is no reason why your traction control should be disabled, mine works fine. One of many reasons why I went for injected gas over mixer.

[rokkz]

Thank for all the replies there seems to many different opinions on what the consuption should be i suppose a lot of depeneds on driving conditions,loads,the nut behind the wheel,age of the motor(mine has only done 115.000km)as i said I don,t want to spend and commsirac said as well $100's buying new leads and plugs when there is nothing wrong with them to save a few dollars at the bowser maybe I will replace the air filter.

Put a multimeter on them before you pass judgement, mine looked fine but the resistance was out on two by a mile (with just over a 100,00 on the clock)

Not to mention cheap insurance for your coils and electrics. Another vehicle I owned had a dodgy lead, $220 for Coil and another sensor later......never getting top gun leads again.

For the sake of 6 X NGKS $26 twice a year and 1 X Set /Bosch Leads $75 every 5 years, why wouldn't you?

Cheers

[Tilvywgn]

You re right rokkz, traction control wont work on a mixer setup because the computer cant regulate/shut down the gas flow to stop the wheels from spinning as opposed to when running on an injected gas system...

[rokkz]

You re right rokkz, traction control wont work on a mixer setup because the computer cant regulate/shut down the gas flow to stop the wheels from spinning as opposed to when running on an injected gas system...

Yep Yep, because the Gas Injectors rely on the spark signal from the factory ecu before it passes through the dedicated LPG computer(fuel mapping), when loss of traction kicks in, the factory ecu signal is restricted which in turn retards the supply of gas as it does for petrol.Blownba could explain better.

[blownba]

????
I am lost after that last post.
LPG injection, be it vapour or the new liquid injection system, will allow the traction control to operate correctly, as the petrol ECU cannot tell it is running on gas so it is able to retard injection to limit engine torque output and then it will grab the brakes on the spinning wheel transfering torque to the wheel that is not spinning and hasmore grip.
The new liquid injection systems do not run a gas ECU. The petrol ECU runs the liquid injectors directly. There is no lag in injection time while the gas ecu calculates injector pulse width, so the system is far more accurate and the cooling effect of the liquid LPG being injected into the intake manifold at the engine valve actually cools the incomming air into the engine making it more dense (like a intercooler) with oxygen, therefore making the combusable mix more volatile giving you more power.
Every car we have fitted with Liquid injection gets more power than petrol. (XR6T gained 18 RWKW with no tuning!!!!) and has the best economy of any LPG system with only a 5% increase in economy over petrol usage.
I have had 2 guys (customers) swear black and blue that they get the same economy as petrol, but I don't know how true that is.

[Tilvywgn]

The mixer setup (well, at least mine, which is a SPRINT gas system) does use its own ECU and not the original petrol ECU which it bypasses and therefore traction control has no means of regulating gas flow. The petrol and gas ECU's dont 'talk' to each other and arent wired together. Thats also the reason why that system cant be dash integrated (well, again, it might be able to but then you would have to somehow hook the gas ECU up to the petrol ECU or use only the petrol ECU to control gas flow as well, but then you re talking another setup again. no idea if that is possible or not with the SPRINT mixer setup, I reckon its not...). The installer has not touched the petrol side of things at all, mainly installed another complete fuel setup parallel so to say.

[Shounak]

Our BA XR8 is on gas and it gets the same economy. Between 0.3L/100km IIRC.

[JSCOLLO]

Hi Guys, Just converted my car to gas on a Mixer system last week. Last week i got 500 kms out of a 75 lt tank and still had 100 km to go.

[steve40]

Gday guys just an update on my ecomony from my vy I ran it completly empty until it flicked back to petrol and got 575km,when I filled up it took 72 litres and that that was 1/2 country And 1/2 city driving which I think is pretty good......

[commsirac]

Last week i got 500 kms out of a 75 lt tank and still had 100 km to go.

??

So really you reckon there was 600km worth in 75L of fuel?

[steve40]

well yea going on what I got out of it.....