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johnny senna

Original Poster:

3,850 posts

152 months

[news] 
Monday 25th February 2008 quote quote all
LPG conversion on a Cayenne....anyone done it? Just wondering. Lotta car for 20K. Just needs cheaper fuel costs.

Ash 996 GT2

3,559 posts

121 months

[news] 
Monday 25th February 2008 quote quote all
No problem if you want to stuff the heads, valves and amy moving part.

LPG is ok in a low cost car, I have it on my Vectra however, all the above has gone on mine.

LPG does not have the normal lubricants and cleaning properties of normal fuel.

My advice, DO NOT DO IT.

thegoose

7,290 posts

90 months

[news] 
Monday 25th February 2008 quote quote all
A friend has a BMW 740i that's been run on LPG since he's had it. It's now at 225,000 miles and runs just fine. He bought a Range Rover last summer (with the same 4.4 engine) and immediately converted it and that's fine too.

Probably better to wait until someone can actually answer your question before deciding what to do (i.e. someone that's got experience of an LPG Cayenne).

johnny senna

Original Poster:

3,850 posts

152 months

[news] 
Monday 25th February 2008 quote quote all
Thanks fellas, anyone else have a view?

Keithp

299 posts

105 months

[news] 
Monday 25th February 2008 quote quote all
I have a discovery which i had converted when it had 17k on it and its currenty on 92k , and if i was honest it's not been the best mentained disco on the road , we have had one or two issues but on the whole the gas system has only let us down once in that time.

I looked into doing the cayanne at one point they have been done, i found a few conversions on google. It wont be a cheap conversion though and you will have to consider the lost space due to the tanks.

Keith



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scam73

29 posts

85 months

[news] 
Monday 25th February 2008 quote quote all

Hi,

I bought a Cayenne S on a 53 plate in November, was originally looking at X5 3.0d, test drove the Cayenne and that was that!

Where I live everyman and his dog has a RRS or Black X5, so the Cayenne was a little bit different and I loved the performance, space, equipment and even like the looks of black with tan interior, paid 22k for my car with 50k miles, every extra on it including air sus etc, plus warranty.

Had mine converted by GreenFuel company, they put me in touch with a highly recommended converter in Worsley, he did a great job of fitting a 70 Litre tank in the spare wheel well and lifted the boot floor only about an inch (no big deal), the guage for the tank is in the cup holder cupboard near centre arm rest etc, very neat, you wouldn't notice it is converted as the filler is in the black plastic of the off side rear bumper.

When you turn the engine over it runs on petrol automatically until the engine is slightly warm then seamslesly switches to LPG, well i am b*uggered if i can tell any difference in the performance, engine pick up feels exactly the same and smoothness is unchanged, all i know is that i am paying 45-55 pence per litre and with the conversion costing 2.5k all in i will get my money back based on 12k miles within a year, also the dealer said that a car with a conversion is also a 1k premium!

If i had gone x5 3.0d route i would probably achieve 28-32 mpg at best, with the LPG Cayenne i am already getting the equivilant of 35 mpg due to the fuel price difference, and i get the roar of the V8 and 350bhp!

The conversion is warrantied by the converters and they say they have worked on many big V8 engine cars with no problems!

Best of both worlds in imho.

thegoose

7,290 posts

90 months

[news] 
Monday 25th February 2008 quote quote all
It costs £3364 to do 12,000 miles at 17 mpg (@ 1.05p/litre). On LPG this cost should roughly halve (you use 20-25% more LPG than petrol for the same distance), so saving will be around £1700 a year.

Still, paying for the conversion within 2 years is great (although it's only after that when you start saving money) if you're keeping the car for at least 3 years - not many people do with Cayennes though. I don't think it'll be worth any more with the conversion and will make it less saleable to some people (due to reduced space or giving a buyer the impression the owner has been very careful with his money, has he scrimped on maintaining it?). You may also run into warranty problems with Porsche.

The conversion argument stacks up better for higher annual mileages, at 12k pa personally I don't think I'd bother.

BTW, an X5 3.0d is unlikely to do as much as 28-32mpg (hence I'd have the V8 every time).

scam73

29 posts

85 months

[news] 
Monday 25th February 2008 quote quote all

My converter chap said you only loose about 10% of the fuel comsumption with LPG over petrol, will be doing at least 12k but more like 20k miles per annum and am deifinetely keeping it for 3 years plus as i have spent too much money on changing cars every 3 months etc.

As well as the long term cost benefits of LPG conversion other factors were that with unleaded i just couldn't get my head round putting 20 quid in the car and the fuel light still being on, now a full tank is 30 quid!

Car is warrantied and insured with conversion in mind too.

Cheers.




johnny senna

Original Poster:

3,850 posts

152 months

[news] 
Monday 25th February 2008 quote quote all
Very useful replies, thank you.

Gio G

997 posts

89 months

[news] 
Monday 25th February 2008 quote quote all
In the spirit of owning a Porsche...I would not bother...would have bought a diesel instead.

DucatiGary

7,765 posts

105 months

[news] 
Monday 25th February 2008 quote quote all
i had my range rover done a few weeks ago, went for the propper multi point SGI system from Landi.

cost two and a half grand for a propper certified install, and so far im really pleased with it.

lpg is 48p per litre round here so in money terms im getting about 36mpg.

no noticable loss of power actually the only difference im noticing is when i go to fill up on fuel, you got to a different pump and its cheaper.

johnny senna

Original Poster:

3,850 posts

152 months

[news] 
Monday 25th February 2008 quote quote all
DucatiGary said:
i had my range rover done a few weeks ago, went for the propper multi point SGI system from Landi.

cost two and a half grand for a propper certified install, and so far im really pleased with it.

lpg is 48p per litre round here so in money terms im getting about 36mpg.

no noticable loss of power actually the only difference im noticing is when i go to fill up on fuel, you got to a different pump and its cheaper.
Sounds very interesting. It's fine seemingly as long as you do the miles and keep the car long enough to justify the 2.5K expense.

Edited by johnny senna on Monday 25th February 17:45

thegoose

7,290 posts

90 months

[news] 
Monday 25th February 2008 quote quote all
johnny senna said:
Sounds very interesting. It's fine seemingly as long as you do the miles and keep the car long enough to justify the 2.5K expense.
That, coupled with the inconvenience of needing to know where you can fill up as not everywhere has it.

The other thing you can do to improve things further is to instal a big storage tank at home, in which case you can buy it in bulk for under 30p a litre or so (and only need to visit petrol stations on long trips).

johnny senna

Original Poster:

3,850 posts

152 months

[news] 
Tuesday 26th February 2008 quote quote all
thegoose said:
johnny senna said:
Sounds very interesting. It's fine seemingly as long as you do the miles and keep the car long enough to justify the 2.5K expense.
That, coupled with the inconvenience of needing to know where you can fill up as not everywhere has it.

The other thing you can do to improve things further is to instal a big storage tank at home, in which case you can buy it in bulk for under 30p a litre or so (and only need to visit petrol stations on long trips).
Cool! A fuel storage depot at home. Ready for the nuclear attack, totally self sufficient! I would grow vegetables in the garden as well. smilewink

_gez_

993 posts

74 months

[news] 
Tuesday 26th February 2008 quote quote all
Ash 996 GT2 said:
No problem if you want to stuff the heads, valves and amy moving part.

LPG is ok in a low cost car, I have it on my Vectra however, all the above has gone on mine.

LPG does not have the normal lubricants and cleaning properties of normal fuel.

My advice, DO NOT DO IT.
So how come all the cars at Jonathon Palmers Bedford Autodrome run on it [including the 911's and the new XKR jags]. They get a daily flogging. I'm sure if heads and valves kept going as you describe they would have long since swapped back to petrol.

wrightyrs

446 posts

99 months

[news] 
Tuesday 26th February 2008 quote quote all
They probably have a system called "Flash Lube" fitted.

Its an extra lubricant that feeds into the inlet manifold and gives the head/valves the extra lubricant they need.

Is well worth the cost of the oil compared to replacing the head etc.


DucatiGary

7,765 posts

105 months

[news] 
Tuesday 26th February 2008 quote quote all
thegoose said:
instal a big storage tank at home
not sure the taxman would approve of that.

but

if your friendly with your local farmer chances are they have a mass of LPG used for heating in the chicken runs etc.

apparently they are really cheap and some already have the nozzle thingy, apparently wink

thegoose

7,290 posts

90 months

[news] 
Tuesday 26th February 2008 quote quote all
DucatiGary said:
thegoose said:
instal a big storage tank at home
not sure the taxman would approve of that.
I wasn't suggesting evading duty, just saving by bulk buying, which I thought you could do - but I may be wrong.

Hmm scratchchin heating gas you say? It's not like it's dyed red is it? whistle

scam73

29 posts

85 months

[news] 
Tuesday 26th February 2008 quote quote all

My conversion posted earlier includes flashlube by the way, you simply check it once a week.

Ranger 6

4,716 posts

129 months

[news] 
Monday 8th September 2008 quote quote all
Dragging an old subject up - a friend is looking at the possibility of converting his Cayenne Turbo to take lpg and has come across the following issues;

1 Has anyone done the turbo before?
2 Tank - sub woofer (Bose) is under/middle of spare wheel, so is there a way of moving the sub to avoid having a tank behind the back seats?
3 Space for possibly two vaporisors, limited under the bonnet! will they fit in front of the rad?

Have any of you guys that have already done one come across these issues?

Edited by Ranger 6 on Monday 8th September 10:37

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