Gas injection , fuel figures

Submitted: Wednesday, Feb 07, 2007 at 17:33

ThreadID: 42085 Views:7094 Replies:4 FollowUps:15

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Rock Crawler

ok , Just to update on the gas injection consumption figures and opreration stats. for the PRINS gas injection KIT.

i wont name the kits that failed in my view for certain operations , so i don't offend anyone.

Out of 4 major tested kits , I found only 2 to hold program memory after disconecting the battery.

the kits that held there there program , were Sprint and Prinz , theVoltan kit , I still am undisided as it lost program 2 times out of 10 (this could have been a programing error.

The Fuel stats on the prins kit are as follows . Its taken so long , do to all kms had to be done on the same stretch of road . Same outside temp with a veriance of 2 deg. and humidity tolerance of 5%. same vehicle weight ect ect.

Vehicle is a 100 series landcruiser , with 35" tyres , rear draws bar winch and a ton of electronics lol . So not the most economical vehicle on the road.

On Petrol ( city driving ) i was returning 22.2 L per hundred kms , on gas I was returning 25.30 L per hundred kms

so cost was 22.2 x 1.16 a litre $26.41 in petrol and 25.3 x 49 cents a litre=$12.39

over 500 kms Petrol cost $132.05 and gas cost $61.95 saving = $70.10
over 1000kms Petrol $264.10 gas $123.30saving =$140.80

Thats $1400 saving every 10.000 kms Gee am i happy lol ( if I got my maths right )

But I am sure someone will pick up my mistake , if I have made one .

Cheers , hope this info is usefull to someone .

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Reply By: icecold - Wednesday, Feb 07, 2007 at 22:45

Wednesday, Feb 07, 2007 at 22:45

Hey,
Ok since u know a bit about LPG conversions.
I have just dropped my XR6 falcon for a LPG conversion. Im not getting the Injector type but the Mixer.
Is there much difference in fuel consumption as to the Injector type?
Chrisco

AnswerID: 220496

Follow Up By: Rock Crawler - Thursday, Feb 08, 2007 at 07:45

Thursday, Feb 08, 2007 at 07:45

what model XR6 ? I hope its not a BA that your using a mixer on

FollowupID: 481118

Reply By: Member - Stan (VIC) - Wednesday, Feb 07, 2007 at 23:01

Wednesday, Feb 07, 2007 at 23:01

"i wont name the kits that failed in my view for certain operations , so i don't offend anyone.

Out of 4 major tested kits , I found only 2 to hold program memory after disconecting the battery. "

Come on Eric,

Is it better to name the kits you tested and pros/cons of diffrerent units, so
people who are looking at getting one can make an informed decision.

For example the Tartarini System that I got doesn't hold program memory either but it still drives without any problems after battery has been disconnected.

Did you experienced any problems with Injectors on any systems that you tested?

AnswerID: 220498

Follow Up By: Rock Crawler - Thursday, Feb 08, 2007 at 07:48

Thursday, Feb 08, 2007 at 07:48

The problem is , whats amount of gas is going into the engine , if you loose your program Stan , it dosnt take long to burn a valve , if the system leans off .

FollowupID: 481119

Follow Up By: Rock Crawler - Thursday, Feb 08, 2007 at 07:50

Thursday, Feb 08, 2007 at 07:50

sorry . Yes I did test injectors , and boy , are they miles away from been right lol.

I must say , the injectors on the Prins system work well , and seem to last the longest so far. But can be noisy on some vehicles , and it is a pain in the A S S that there grouped in 3's ( for fitting perposes that is ).

FollowupID: 481120

Follow Up By: Rock Crawler - Thursday, Feb 08, 2007 at 07:52

Thursday, Feb 08, 2007 at 07:52

Sorry Stan , the reason I didnt want to name the kits , was because , all these kits are constantly under development. So a good chance that they may work ok in the future .

FollowupID: 481122

Follow Up By: Robnicko - Thursday, Feb 08, 2007 at 10:39

Thursday, Feb 08, 2007 at 10:39

Stan & Rock Crawler
My case = 1995 cruiser 4.5 running Impco system fitted by LPGAS1 in VIC back in 1998.
Will consistently get 120k per 1/4 tank of gas and 150k per 1/4 for petrol. Mind you lately ive been using Vortex 98 when I fill it. Makes a big difference both in power and economy. Car now has 270k on the clock and gas was fitted at 65k. Never had the head off (touch wood) and have always had the valves ckexhed every 60k or 3 years.
My beleif is to always start on petrol, switch to gas after 10 minutes and then turn back to petrol about 5 minutes before I get home. A mate of mine who reco's cylinder heads told me this when I got it converted as he gets lots of Cruisers in where people have hardly run them on petrol after converting to gas.
I also keep the Flashlube topped up, put some in the petrol tank and when doing a long trip on Gas turn the dripper valve so a bit more goes in the manifold.

Rob

FollowupID: 481150

Follow Up By: Rock Crawler - Friday, Feb 09, 2007 at 23:47

Friday, Feb 09, 2007 at 23:47

Hi Rob. Sorry mate , i am going to come across like a bit of a P***K but i cannot believe that you get 19 l per hundred on gas in your 80 series . There is something seriously wrong here.

I hope your figures are incorect , because it would mean that your engine is running dangerously lean.

other thing could be a incorrect odometer

I would love to hear from other 80 series owners , but my previous 80 . never got close to that lol

only way i can see it happening , is if you drive so slow that you only sit on primary fuel lol

cheers mate

FollowupID: 481602

Reply By: icecold - Thursday, Feb 08, 2007 at 18:30

Thursday, Feb 08, 2007 at 18:30

Hi, yes it is a BA XR 6 falcon. but i have spoken to the taxi guys here who have same car and they said they have no probs with the mixer. mind you its NOT a XR6 Turbo. Just standard XR6.
Ur making me worry now.
Regards Chris

AnswerID: 220608

Follow Up By: Rock Crawler - Friday, Feb 09, 2007 at 00:53

Friday, Feb 09, 2007 at 00:53

Don't do it Chris , I supply Melbourne with Cabs for a living . The only system that works , average , is the dedicated system. let not even go to the it's ilegal to fit this system on your car, as there is no non dedicated system with mixer approved for BA till today . if you get one back fire , its all over, its not if , but when .

Save you bucks and dont do it. Ring the gas authorities and ask them , if what there doing is legal . My money is on not .

cheers

FollowupID: 481354

Reply By: Member - Bradley- Friday, Feb 09, 2007 at 20:43

Friday, Feb 09, 2007 at 20:43

Gday Eric, mate have you had any dealings with the OMVL injection system? Italian made, because i have pretty much decided on this set-up for my jack and i was of the understanding it still uses the closed loop off the original ecu to chase lambda etc. It is the set-up with ecu under dash, injector manifold on the firewall and hosetails tapped into the inlet runners. Looks very well made, gonna cost me $4800 for the complete kit (new aux tank etc) and identical jacks are returning 18/100 city running. It starts on petrol, triggered by coolant temp switches over to gas, if gas runs too low it auto switches back to petrol, same power etc..

I just gota pimp myself for another $1900 and i'm there LOL..

cheers mate. Brad.

ps - your maths looks about right to me, id figured on mine breaking even at the 10-11 month mark.

AnswerID: 220890

Follow Up By: Rock Crawler - Friday, Feb 09, 2007 at 21:12

Friday, Feb 09, 2007 at 21:12

Brad , the omvl Dream also known as sprint gas is not high on my list , one of the first kits around and injectors only lasting 40 ,000 at best, yes I know someone might have done better, but it' s very rare.

FollowupID: 481559

Follow Up By: awill4x4 - Friday, Feb 09, 2007 at 23:03

Friday, Feb 09, 2007 at 23:03

Eric, do you know if any of the gas vapour injection systems have been used in a forced induction (turbo) engine? A mate I know wants to turbo an efi GQ but run dual fuel and run mostly on gas and I was wondering if an injected gas system could be used or whether the injectors aren't designed for boost pressures.
I'll be interested in hearing your thoughts as my vehicle is the same as my friends and hmmmmm turbo petrol/injected LPG the best of both worlds.
Regards Andrew.

FollowupID: 481590

Follow Up By: Rock Crawler - Friday, Feb 09, 2007 at 23:39

Friday, Feb 09, 2007 at 23:39

Gas actually work very well on forced induction engines , especially turbo , due to how cold it is . All gas systems are vapour , there isnt a liquid gas injection available as yet , would love to see one though lol.

The injectors would not be a issue , its the convertor that wont cope after certain power curves , but 2 convertors would fit that. With the injection system , you can map the gas as in a modified computer for petrol to allow more gas at diffrent stages .

The boys have just gone tropo on a 6L holden v8 and playing around with a dual convertor set up now, ill let you know how it goes .

With injection , there is also the option of fuel swap at higher revs if engine lean off

FollowupID: 481600

Follow Up By: Member - Bradley- Sunday, Feb 11, 2007 at 01:05

Sunday, Feb 11, 2007 at 01:05

Thanks Eric, i would hope they have sorted a basic component durability issue like that by now, i'll do some checking up on it...

Do you know anyone else who is doing kits for jackaroos with the right emulators etc. apart from the omvl/sprint ?

Andrew- yep gas injection and boost go together real nice. There is a mob in adelaide doing a lot in this area at the moment. They have an xr6 turbo ute doing the rounds of the mags (zoom a few months back - street machine currently) which runs on lpg up until about 10 psi boost then switches back to petrol, turns 330kw at the back wheels. They stated that it is possible to use lpg for the whole time but ti requires a bigger kit. This ute only had the "basic" setup injection kit.

Same mob does gen3/4 commodores on lpg injection - same running cost as a barina :-))

FollowupID: 481734

Follow Up By: Rock Crawler - Sunday, Feb 11, 2007 at 09:04

Sunday, Feb 11, 2007 at 09:04

The Prins kit is available for you jack , call Pro Gas for a quote

FollowupID: 481759

Follow Up By: Member - Bradley- Monday, Feb 12, 2007 at 11:19

Monday, Feb 12, 2007 at 11:19

geez Eric that prins system must be good, got a quote off progas - $5300 !! $500 more than the italian setup. Dunno if i can justify the extra, its hard enough to find the cash as it is.

Thanks mate, Brad.

FollowupID: 481922