honestly i'd not take the risk of a conversion

and not wishing to be rude but if your looking to get 'cheap' mpg one would have to ask if RR ownership is for you?

I haven't got my car yet, but I have found a very successful prior conversion to a 4.2 s/c FFRR. It's a guy on Pistonheads, I found one of his posts and e-mailed to enquire about his gas conversion and received the e-mail below:]


Thanks for the e-mail. I've done the best part of 70,000 miles in mine since the conversion and its not missed a beat. There are always people who say you shouldn't do this or that but to be honest I haven't had a moments trouble. There is no loss of performance on LPG and changeover on running out is seamless. The only real bug bear is the rising price of LPG. Two years ago it was down at 47p, now its over 80p and they reckon inflation is at 3%!! I've been thinking about changing it for a Bently GT or a Phantom, but to be honest its such a great car I'm going to keep it for another 12 months. I recently drove it down to Monaco as I have a boat down there and used the continental LPG adaptor so I had cheap fuel there and back.

I generally on average get 15 mpg either on petrol or LPG around town and 20 on a run. So I guess if you take into account the reduced price of LPG that equates to about 20 and 25 mpg.

Anyway hope your conversion goes well. Range Rover-less at the moment - Pining!

I really hope you have cracked it! Let us know what happens next.

Out of interest, how many miles pa are you intending doing?

If you can afford a Phantom plus a boat in Monaco then you do not the Lpg coversion? Something fishy there...

Last edited by Gazellio @ Prestige Cars on 20th Feb 2011 10:20pm. Edited 1 time in total

nick h wrote:

honestly i'd not take the risk of a conversion

and not wishing to be rude but if your looking to get 'cheap' mpg one would have to ask if RR ownership is for you?

Gazellio wrote:

If youcan afford a Phantom plus a boat in monaco then you do not the Lpg coversion? Something fishy there...

Why are UK petrol heads so against LPG, the rest of Europe love the damn stuff, it enables you to run big V8 engines without away your hard earned cash at 1.8 times the rate you would on petrol! And personally I find no matter how much I earn, money not paid in tax is always just as sweet as money earned!

To me this exemplifies the problem of forums. One or two people have a conversion done which goes wrong, they go onto loads of forums ranting about their tale of woe, and an internet legend is born. How many people who just get their cars converted without issue go onto forums to rave about it? Well sales training says that people are ten times more likely to go and complain than to give praise. I know a lot more cars have been converted than are being complained about, and how many Supercharged Range Rovers have you ever seen for sale with engine problems having been LPG converted? Anybody, no, me neither, I have a BMW LPG conversion with an engine problem though! And everybody says the LPG is bulletproof and ideal for conversion.

So anyway, if my beautiful 4.2 Supercharged explodes in a couple of weeks, you can all say I told you so. But when I'm still enjoying it in 5 years, having saved £12,500 in fuel costs, Ill be the one laughing!

Rant over!  Range Rover-less at the moment - Pining!

Sorry duplicate post Range Rover-less at the moment - Pining!

Last edited by bozmandb9 on 20th Feb 2011 10:36pm. Edited 1 time in total

sorry duplicate post Range Rover-less at the moment - Pining!

I have owned an LPG Range Rover myself and they are great if you intend to keep long term. Its just that Phantom/Yacht ownership requires megabucks and that rarely combines with a relatively old LPG converted Range Rover. Just my opinion and that's all but that's the beauty of forums...

Hope it all goes well with the LPG. I've had two previous FFRR's with LPG (4.4's) and it's a very satisfying feeling putting your foot down without, clearing the national debt.

I can understand you kicking off about some of the comments as well. "If you can't afford the petrol etc etc" is a quote that can get overused sometimes. I've looked at a couple of S/C myself but think I might just stump up for the fuel rather than convert (i'd be too worried about the potential head probs). If it was an option though i'd much rather have the LPG. I CAN afford the fuel, but would much rather spend the spare money on some nice chrome spinners .

Best of luck with it all pal. I'm sure the tech has come on enough to work well for you. My Previous RR's!
2018 P400e Autobiography
2008 TDV8 Vogue
2006 TD6 Vogue
2007 TDV8 Vogue
2007 RRS (I know, it doesn't count!)
2005 4.4 Vogue on LPG
2005 TD6 Vogue
2003 4.4 Vogue
2001 4.6 HSE
2000 2.5 DHSE
1999 4.6 HSE
1997 4.6 HSE on LPG
1995 2.5 DSE
1989 3.9 EFI classic
1988 3.5 EFI classic

Seems there might be some knowledgeable people in this thread that could help me...

I have a 2007 FFRR Supercharged, with 99k on the clock. It had a BRC kit fitted 3 years ago with the autolube system, and runs smoothly on both gas and petrol.

However, I have 2 concerns: the main concern is that there is a horrendous smell of exhaust gas, particularly when running on petrol to the point that when I connect up a trailer to the car, I need to turn the engine off for fear of being asphyxiated at the back of it! The car has had the cats removed by a previous owner, and (I think) a crackle over run map put on the car, which makes it smell very rich and sound incredibly loud, but the fumes are so bad that I can't put the windows down while driving as the vacuum effect from opening a window sucks the fumes in to the cabin. Could this be a result of the LPG system being installed, or more likely just need the cats put back on and get any sort of custom map removed? I also don't know exactly how the BRC system works... it has it's own ECU so I was under the impression that the petrol map/setup etc wouldn't need to be touched at all as part of the install - am I wrong on that?

My second concern, is that I had the car put on the dyno (running on petrol - standard 95 octane) and the ENGINE power was calculated to be around 335hp - that seems extremely low for petrol performance. I guess my main question is, would the BRC installation have included the NEED to modify the petrol configuration, to a point that the car would lose performance, or should the BRC system not compromise the petrol aspect of running in any way?

My plan as it stands is to firstly rectify the problem by asking a land rover dealer, or specialist, to reflash the ECU with totally stock mapping - but I need to understand what impact that may have to the LPG system. It certainly makes the whole process a bit more tricky. And of course, get some cats put on it.

Really struggling with the best approach to this as the LPG adds so many unknowns.

Thanks!

I'd start with thinking about the map. Also have the emissions checked, if it's that rich it's amazing it passed an MOT.

LPG fumes shouldn't be very smelly at all. A slight whiff of baking bread at the most.

Removing the cats didn't make a lot of difference, as long as the remap has taken that into account.

Some cheap remaps do little more than force more fuel in.

I think the facelift 56 onwards has the aircon seats as standard

Not all have rear seat screens even on facelift but worth looking at 56 onwards if your budget allows.They are supposed to be the best engines if you service regular and dont mind 14-20 mpg a lot of fun