Is injected gas worth the extra cash

[cazzz12000]

I,'ve been reading the other thread about how many km's people are getting from gas and read P38a post that he is getting worse km's from injected than his venturie system.Ron could you please tell me how much more gas and has anybody else had or heard this as there is about $1k differance in pricebetween the 2 systems and could put that to use else where thanks zacc

[100I]

I think there's something wrong with yours Ron, it should be better than the old

[PAT303]

Spend the dollars.Would you take the injection off and fit a carby?That is what you are paying for.I have had both systems,there is no comparison. Pat

[loanrangie]

Possibly with the lpg injection as it is ecu controlled it may actually be running correctly ie enrichening and leaning out when required as opposed to the older system where it is tuned mid range hence why most are gutless when you try to accellerate hard ? Same diff between carby and efi, a well tuned carb will be economical when just cruising around but thirsty once you tramp on the loud pedal, efi will just open the injectors longer pumping the juice in.

[p38arover]

The injected LPG on mine is noticeably more powerful on hills. I can't pick the difference between petrol and LPG.

Note that the new engine has been worked so I could be driving it harder, too.

[thor2]

Just a quick note on my experience of converting to lpg, i have a series two V8 rang around quite alot of places in melb where i am based, some argued for injection others argued for the old, i chose the old system which was done at a long time lpg conversion business and i have logged my kilometres for 8 months, driving to and from work not going hard on the accelerator has seen consistent figures of 21/100 kms to 23/100 kms, country runs of long duration on the freeway and highway see 19/100 kms driving off road i have mainly used petrol just using the gas to get to the start and then home again, reflect on the figures i heard/read on a post where a guy had paid the extra for injection and was over the moon with 24/25 per 100kms does that seem worth it to you? I certainly have been very happy with the old style conversion and saved alot more than 1000 dollars by not choosing the vapur injection system, hope this makes sense or is helpful

[cazzz12000]

thanks for the replies still dunno which one to go for zacc

[RonMcGr]

thanks for the replies still dunno which one to go for zacc

Put it this way, do a search on the old LPG system and read the stories about back fire and damage to the intake system.

The injection system is almost identical to power from fuel injection and it WILL use a lot less than an old venturi.

As Pat303 says, why revert to an old system when there is a better one on the market.

[p38arover]

Re backfires, I had enough damage totally destroying air boxes (at nearly $300 each) to almost pay for the difference in cost of the two systems. In the end I fitted a steel aircleaner from an older Rangie

Backfires and blowing off hoses was so bad my wife refused to drive the Rangie on LPG. If it backfired on her, she wouldn't have known how/where the hoses went back on.

That's one of the reasons I pulled it off the car.

[GrahamH]

More re Backfires ...
I used to have an occasional backfire with my old 3.5Lt '88 Rangie but it had a flapper-type on-return valve in the air intake to protect the "dunny-door" airflow meter so that survived OK.

However it used to blow hoses off all round the plenum chamber which were a pain to find. My solution was to securely clamp all but the short U-shaped one on the driver's side of the plenum which was easy to see and refit. It usually backfired at start-up and I just hopped out, opened the bonnet and pushed the hose back on and Bob's your Uncle.

However this wasn't an acceptable solution for my wife and it contributed, ultimately, to my decision to sell the old girl (er... the car). The Rangie was always quite reliable for me - it always saved up it's "dying for no apparent reason" antics for my wife and I suspect this is another undocumented feature of Lucas electrics.

The Discovery, after some initial backfires when I first installed LPG, has been completely reliable and I haven't had a backfire with the fumigation system in a couple of years (I'm tempting fate here, I know!). The two contributing factors to the early backfires were a leaking vacuum hose and arcing between the HT leads causing cross firing. I can't stress how important it is to keep the HT leads clean and to run the engine at idle with the bonnet open in pitch dark to see if there are any arcs and rearrange the leads to stop them. New leads with 8mm insulation help too.

I fitted an O2 sensor in the exhaust and a stepper motor power valve in the main gas line to the mixer with a closed loop controller between them and it works brilliantly. I can't tell the difference between running on LPG and petrol and I get about 20Lt per 100Km on LPG (200Km per 50Lt fill-up around town and 225Km on the open road) which I'm pretty happy with.

Ron, your economy sounds a bit dissappointing but you do have a worked 4.6Lt against my 3.9Lt engine and I suspect the P38A is a bit heavier than the SI Disco so maybe that's not unreasonable. I'll be interested to hear how it goes as the engine beds in and frees up. Good luck.