Thread: V8 Disco gas conversion

I've not had any problems with my LPG conversion (other than a few initial teething problems) and I have been quite happy with it.

As far as fuel consumption goes, it does use a little more than on petrol but with LPG being so much cheaper than petrol it is still a worthwhile investment. My LPG conversion had paid for itself in just a few months and I don't drive a lot.

I've never noticed the difference in power but I have been provided that there is some. I had my car tuned on a Dynometer recently and the result was that on LPG there is 4kw less power than on petrol but this kind of difference isn't noticeable under any of the conditions I've been driving under.

I don't remember the LPG system I've got but it was certainly worth the money.

I hope this helps!

No probs with mine and it's been on for quite a few years now. You usually bank on about 20-30% greater consumption on LPG with a venturi system. The acceleration isn't as spritely but is perfectly allright for normal use.

I prefer to use LPG when offroad as it works at any angle and the softer power delivery is kinder to the driveline.

Mine was on when i bought it.I've had no trouble with it and can't notice any diff from gas to petrol

I converted my 4.6 RRc to LPG (vapour system) about 18 months ago and on a recent dynotune (dual mapping) there is 7.4Kw difference between LPG and Petrol although the consumption on LPG increases markedly when towing heavy loads.

I have absolutely no regrets having converted, as it has meant that trips that I would have avoided with petrol prices where they are I can still do without it hurting my pocket.

What really annoys me however is the time I spend in fuel stations. The 59 litres of LPG in the scuba tank only gives me about 300km range where I am used to having around 600km on the petrol tank. LPG seems to fill slower as well. More than that, there is usually only one LPG bowser to every 6 petrol bowsers and petrol people are often blocking the LPG when petrol bowsers are free. Ideally I would be looking for between 90 and 100 Lt LPG if I were converting at the moment.

I am currently investigating having APA Mfg making up some "special" tanks. These would be on the same diameter as one of the tubes in my manifold tank made in a length to fit between the radius arm brackets on the RRc and Disco Series I. They would drop down about 60mm below the bottom of the chassis rail (or about 10mm where someone has a 2" body lift). Each tank would give about 19 lts of LPG and the pair bringing my total LPG volume to about 97 Lts and about 500 km range. Would anyone else be interested?

Originally Posted by Lotz-A-Landies

I converted my 4.6 RRc to LPG (vapour system) about 18 months ago and on a recent dynotune (dual mapping) there is 7.4Kw difference between LPG and Petrol although the consumption on LPG increases markedly when towing heavy loads.

I have absolutely no regrets having converted, as it has meant that trips that I would have avoided with petrol prices where they are I can still do without it hurting my pocket.

What really annoys me however is the time I spend in fuel stations. The 59 litres of LPG in the scuba tank only gives me about 300km range where I am used to having around 600km on the petrol tank. LPG seems to fill slower as well. More than that, there is usually only one LPG bowser to every 6 petrol bowsers and petrol people are often blocking the LPG when petrol bowsers are free. Ideally I would be looking for between 90 and 100 Lt LPG if I were converting at the moment.

I am currently investigating having APA Mfg making up some "special" tanks. These would be on the same diameter as one of the tubes in my manifold tank made in a length to fit between the radius arm brackets on the RRc and Disco Series I. They would drop down about 60mm below the bottom of the chassis rail (or about 10mm where someone has a 2" body lift). Each tank would give about 19 lts of LPG and the pair bringing my total LPG volume to about 97 Lts and about 500 km range. Would anyone else be interested?

Would depend on cost but i would love some more range

I have a banked gas injection system on my 4.6 disco and luuuuuurrvvve it. I think it is a romano mixer. With the D2 you will get sequential injection instead of banked.

More power and about the same economy as petrol. Gas tanks underneath and a 40lt qtr panel tank so I have kept my original boot space.

Down sides. Limited range if there is no gas around. Does take some time to fill particularily if it is a hot day. This is because the fuel stations gas tanks are usually located underground. This keeps them at a more constant temperature and on hot days they are colder than the gas tank on your vehicle. The lower temperature of the tank results in a lower overall pressure and so your gas tank (with a higher pressure) wither wont fill or will fill slowly. It may be possible to overcome this by filling more regularily but that is a pita.

Originally Posted by nsgnomad

I would like to hear from any members who have had their V8 engined discovery converted to LP gas. In particular I want to hear if you have had any problems with the conversions or are happy with it, any noticable changes in power/fuel consumption and what brand of converter was used. I have a '96 model that I am about to get converted so I would appreciate your comments. Thanks

Mate I converted my disco 3.5 ltr v8 with the gas unit from an EA Falcon wagon
its great as the Falcon is 3.9 litre anyway so it just runs great 12 months now no dramas
at all but it eats it quick lolz

I've got a direct injection system on my 4.6L disco.

The previous owner tried a conventional gas system which kept backfiring and blowing up air boxes so he decided to put on direct injection system that injects gas into the inlet manifold. No backfires since.

I can't comment on the old system but the direct injection system is great. I use 26L/100km and get 90Kw at all 4 wheels.

The only thing I don't like about the system is the tank. A 76 litre (useable) tank was installed in the rear and it really takes up room. Another thing is if you are looking at putting in a cargo barrier in the future, ensure you get it mounted a little way off the back seats. Mine is mounted right against the seats and so the only option now is moving the tank or getting a custom cargo barrier. Both of course mean extra $$$. A scuba system would be better space wise but then you don't get the capacity. I think there are larger tanks that fit underneath the car which could be a good option.

4wding wise I find the gas is a little touchy after going through a whole heap of water. I often find myself switching back to petrol after I've given it a drowning. When things dry out the gas is fine again.


Harvs