Vy Gas Conversion

[Tiger28]

Hi guys I'm new to this site and just what to ask a few questions and get a few views.Im purchasing a Vy 2003 Exec with 113000ks and I want to convert it to Gas.I have been told there is two systems one with the oly style fuel mixture and converter and the Directio injestion.I got a couple of quotes and the cheapest is the old style it is a Impco system worth $2500 while the other is worth $3600 the direct injection.I want to stick to a buget so I'm thinking of going the Impco with a valve saver flushlube system set up to it.What do you people think and what are the main differences between two?? and if people have tsimilar system to the impco how is it going?.Also what should i be on the lookout for on the Vy tell tell signs etc.Many thanks and much apprieciated.

[Amped]

impco have a lot of of problems

[Tiger28]

impco have a lot of of problems

For example??.I have impco system before and know of people and they have been very good.Like all systems converters sometimes need to be cleaned or changed in time.Went to Pro Gas and they had similar system ,but Italian make.

[SAV_117]

injected is ten times better

[yeeros]

go the sequential gas injection since the vy has sequential injection

ask about integrating the system to the factory fuel gauge and trip computer

no more backfire and with the $2000 grant, its never been a better time to convert!

[holdensupporter2005]

I have mine booked in on Monday for SVI Installation

Basically two types of gas systems.
The old mixer style and the Sequential Valve Injection system.
The Impco kit is basically the old mixer style, which can be
integrated into factory gauges.
The Impco kit cannot be fitted to a Manual only on Automatics

[Oppy89]

is it true that in the vy, the cruise controll must be dissabled for lpg?

[Tiger28]

I have mine booked in on Monday for SVI Installation

Basically two types of gas systems.
The old mixer style and the Sequential Valve Injection system.
The Impco kit is basically the old mixer style, which can be
integrated into factory gauges.
The Impco kit cannot be fitted to a Manual only on Automatics

I herd if they use the factory gauges they do not read well so he said it's a seperate gauge.

[Tiger28]

is it true that in the vy, the cruise controll must be dissabled for lpg?

News to me my brother has the injection system and still works fine.

[sah]

is it true that in the vy, the cruise controll must be dissabled for lpg?

No that is definitely not true. I have been running the old mixer type system on my VY for the last 1.5 years. Cruise control works fine. The only thing that is disabled is traction control. There is no traction control with LPG.

Also you are getting a very good price for the direct injection system. The price i got when i got it done was $2400 for the mixer system and about $4000 for the injection one. So i went with the mixer one. Even though i knew that the injection system was better. The reason was the price difference.

Also i had a few backfire issues, but that was due to old ignition leads. Once i changed them all issues were finished. Regarding power loss maybe there is a bit of power loss, but i don't feel much.

Fuel consumption is around 20% more than ULP. Averages around 16-17 litres per 100km on the busy sydney traffic. Changes to 13 litres / 100km on open roads. Overall i am happy. Just have to keep an eye on changing the Ignition leads regularly.

[commsirac]

I herd if they use the factory gauges they do not read well so he said it's a seperate gauge.

Sounds like an installer who doesnt want to go to the trouble of wiring into the dash gauge. What is agreed by anyone who has an aftermarket lpg system is that the small additional gauges they supply, most commonly the led segment ones, are next to useless for accuracy and look cheap and tacky, and are much easier for the installer to wire up.

get the factory mixer system where it uses the dash gauge. It will read as accurately as it does on petrol.

Pay more for the injection system? Do the maths on how many km it will take to recoup the difference based on perhaps 5-10% less lpg consumption if its purely from a $ and cents point of view, no I dont think you will ever drive the car far enough for it to be viable. Injection performs better, sure, why not just switch to petrol when you want to do some performance driving?

[Tiger28]

No that is definitely not true. I have been running the old mixer type system on my VY for the last 1.5 years. Cruise control works fine. The only thing that is disabled is traction control. There is no traction control with LPG.

Also you are getting a very good price for the direct injection system. The price i got when i got it done was $2400 for the mixer system and about $4000 for the injection one. So i went with the mixer one. Even though i knew that the injection system was better. The reason was the price difference.

Also i had a few backfire issues, but that was due to old ignition leads. Once i changed them all issues were finished. Regarding power loss maybe there is a bit of power loss, but i don't feel much.

Fuel consumption is around 20% more than ULP. Averages around 16-17 litres per 100km on the busy sydney traffic. Changes to 13 litres / 100km on open roads. Overall i am happy. Just have to keep an eye on changing the Ignition leads regularly.

To true mate alot of people have told me make sure you change the leads and spark plugs before you put it on gas to avoid backfireing.Have you got the impco system.

[sah]

To true mate alot of people have told me make sure you change the leads and spark plugs before you put it on gas to avoid backfireing.Have you got the impco system.

I have got an Sprint Gas system. The tank is 94L which implies around 75L of Max LPG as you can fill only 80%.

[VYfan]

I herd if they use the factory gauges they do not read well so he said it's a seperate gauge.

Mate I recently got my VY converted here in Perth. I got the injected Prins system and it's running beautifully, no backfiring, a little less powerful but not a great difference. As another guy said I've got a 94L tank but it takes 76L usable which is plenty. It cost me $4400 and he quoted me $3400 for the standard mixer system.

I asked about integrating with the fuel guage but he said it is known to cause problems on VY/VZ models. He said it's something to do with the resistance of the sender. It did just sound to me as though he just doesn't want to go down that track so I've got an LED guage on the grey surround just under the guages on the RHS. It looks ok but I can tell you as far as accuracy goes it's useless.

I get about 250 - 300k's out of the first led, then only another 200k's out of the last 3 lights. I've got it booked in on Thursday for it's first service so he's going to check it out. The one positive I think with having a seperate LED gauge is you can always see how much you have left of each fuel. To be honest now it is done I am not overly bothered.

A mate of mine has a VX on factory gas on the mixer system which backfired when he first bought it but he changed the plugs and leads and hasn't had a problem since but like another guy said, you are probably going to have to change your plugs and leads more often to avoid backfiring.

[Tiger28]

Mate I recently got my VY converted here in Perth. I got the injected Prins system and it's running beautifully, no backfiring, a little less powerful but not a great difference. As another guy said I've got a 94L tank but it takes 76L usable which is plenty. It cost me $4400 and he quoted me $3400 for the standard mixer system.

I asked about integrating with the fuel guage but he said it is known to cause problems on VY/VZ models. He said it's something to do with the resistance of the sender. It did just sound to me as though he just doesn't want to go down that track so I've got an LED guage on the grey surround just under the guages on the RHS. It looks ok but I can tell you as far as accuracy goes it's useless.

I get about 250 - 300k's out of the first led, then only another 200k's out of the last 3 lights. I've got it booked in on Thursday for it's first service so he's going to check it out. The one positive I think with having a seperate LED gauge is you can always see how much you have left of each fuel. To be honest now it is done I am not overly bothered.

A mate of mine has a VX on factory gas on the mixer system which backfired when he first bought it but he changed the plugs and leads and hasn't had a problem since but like another guy said, you are probably going to have to change your plugs and leads more often to avoid backfiring.

Thanks mate for the info yeah herd plugs and leads important for the mixer system told the bloke do them for me at the same time.

[poweredbycng]

The Prins system might not be the best system to choose at it tends to be more difficult to tune, especially for less experienced installers. I have a VZ with the OMVL/Sprintgas SVI kit and that system actually increases torque at low rpm when running on gas compared to petrol. Top end power is exactly the same regardless of fuel used. Full to empty range is roughly 550km out of 70L approx but if you're cruising on the highway all the time then you'll get quite a bit more.

Regards,
Dave

[gottavecalaisv]

got my Vy supercharged 6 calais booked in for the 13th march for the sequential gas injection system (sprint gas components) comes with 2 year warranty and a 76litre useable tank all fitted in a day for $3800.00 less the gov't $2000.Looking forward to saving money on fuel!

[Lumps of cheese]

got my Vy supercharged 6 calais booked in for the 13th march for the sequential gas injection system (sprint gas components) comes with 2 year warranty and a 76litre useable tank all fitted in a day for $3800.00 less the gov't $2000.Looking forward to saving money on fuel!

How many klms do you do in a year, just out of interest?

[gottavecalaisv]

probably 20000 might do more soon as it will be cheaper!!

[vhsle4me]

have a vx wagon running impco system. mostly fine. must change plugs and air regularly. new leads are good to. as it gets older you need to change coil packs and crank angke sensor. gas has a funny way of bringing out ignition issues. i average about 280 to 300kms per tank(donut@50litres). good luck

[Lumps of cheese]

probably 20000 might do more soon as it will be cheaper!!

Ahh yep. That's why i won't convert, lucky to do 10000 a year so not worth it.

[poweredbycng]

Ahh yep. That's why i won't convert, lucky to do 10000 a year so not worth it.

You will be saving a substantial amount even if you only do 10,000km per annum. The LPG conversion, especially if it's a good one, will pay off both in fuel savings as well as improved resale. LPG cars sell for a fair premium over petrol-only cars these days so you'll probably get all of your out-of-pocket expense back right there.

Regards,
Dave

[johnnyk]

Don't bother with SVI. Get liquid gas injection. The traction control will still work as there's no piggy-back ECU. There's also no gas mixer, so you're always getting the right amount of gas. The gas injectors are matched to the petrol ones, so the stock ECU drives them. These gas tanks have a fuel pump and the gas is injected as a liquid. I paid $5200 for my V8 Monaro (last month).

Also gain a bit of power too. Check out Lpg Liquid Injection - Australian LS1 and Holden Forums

I got mine converted at Auto gas injection in Frankston (Melbourne)

[poweredbycng]

Don't bother with SVI. Get liquid gas injection. The traction control will still work as there's no piggy-back ECU.

The reason why traction control doesn't work with mixer-based LPG systems is because of the potential backfire risk as well as because of the single point fuel metering. With SVI or LI, traction control and all other electronic functions work without any problems.

There's also no gas mixer, so you're always getting the right amount of gas. The gas injectors are matched to the petrol ones, so the stock ECU drives them. These gas tanks have a fuel pump and the gas is injected as a liquid. I paid $5200 for my V8 Monaro (last month).

The difference between SVI and LI is that with SVI, a separate ECU controls the gas injectors and requires a separate tune. With LI, the petrol ECU drives the liquid LPG injectors and there is no separate tune. There is no gas mixer with either type of injected LPG system.

Regards,
Dave

[pjdm1980]

got my Vy supercharged 6 calais booked in for the 13th march for the sequential gas injection system (sprint gas components) comes with 2 year warranty and a 76litre useable tank all fitted in a day for $3800.00 less the gov't $2000.Looking forward to saving money on fuel!

Don't bother with SVI. Get liquid gas injection. The traction control will still work as there's no piggy-back ECU. There's also no gas mixer, so you're always getting the right amount of gas. The gas injectors are matched to the petrol ones, so the stock ECU drives them. These gas tanks have a fuel pump and the gas is injected as a liquid. I paid $5200 for my V8 Monaro (last month).

Also gain a bit of power too. Check out Lpg Liquid Injection - Australian LS1 and Holden Forums

I got mine converted at Auto gas injection in Frankston (Melbourne)

Mine's a supercharge stato and i've got no end of trobles with svi
Liquid LPG injection