L322 4.4 V8 LPG Conversion costs & Reviews

Hi All,

Just searched for about an hour or 2 and not really found what I wanted.

How much is a good multi-point system?
Which system is best o the 4.4 L322 Petrol engine?
Who are good installers with plenty of RR knowledge?
What MPG have you all received?

Lets hear from all the end users of LPG systems & their pro's & cons please?

Hi Ive been on LPG on my L322 2004 for a few years now and it FAB, the conversion was £1200 with a 2year warranty (parts) and life time labour as long as you have the thing serviced with them once a year £40.. The system i have fitted is STAG multipoint (must) and is currently doing about 45-50 gallon if you convert it as 69p per litre, an 84 litre tank fits snug into the spare wheel well, or you could have the 95 litre which slightly raises the boot floor about an inch.. no brainer for me stick with the 84 litre, if your interested there's a company called PROFESS gas near me and people travel from all over the country to use them and its all done in one day (0800-1900).. Ive got no complaints ..Hope this helps

Garwillis said:

Hi Ive been on LPG on my L322 2004 for a few years now and it FAB, the conversion was £1200 with a 2year warranty (parts) and life time labour as long as you have the thing serviced with them once a year £40.. The system i have fitted is STAG multipoint (must) and is currently doing about 45-50 gallon if you convert it as 69p per litre, an 84 litre tank fits snug into the spare wheel well, or you could have the 95 litre which slightly raises the boot floor about an inch.. no brainer for me stick with the 84 litre, if your interested there's a company called PROFESS gas near me and people travel from all over the country to use them and its all done in one day (0800-1900).. Ive got no complaints ..Hope this helps

Click to expand...

69p a litre? Blimey, it's at least 80p round here.

My reasearch has told me to stick with Prins or BRC on the L322. Having said that my Zavoli kit on my P38 has been fautless since I fitted it myself nearly three years ago.

If you've got an iPhone or Android down load whatgas to find the cheapest fuel around ..and its a free app wouldn't be without it

Interested in this thread as I will hopefully be looking to replace my LPG P38 next year maybe with an L322. For referance a mate had a BRC kit on his 4.4 X5 and it ran really well.

Here's my 2 pennies worth . I run an L322 converted to LPG . Its a prinz system fitted in Feb 2011 by Alternative Fuels , river road in Barking Essex . Its my third system ,1st was a prinz in a E200 merc (very early sequential) and 2nd was a bygas in a Grand Voyager (also fitted by alternative fuels) . I find the prinz system very good and the quality seems to be up there with the best. I find the mpg to average about 15 (actual, the fuel computer says 21) . I have an 85 litre tank which does about 260 miles between fill ups . It cost me £2000 but I could have had the cheaper Bygas for £1700 .

Leave well alone...if it could run on LPG reliably, LR would have offered a Duel fuel option . And before you ask, I am a 100% petrol head who knew the implications, cost wise before I bought my 3rd V8 many years ago.

i have just swapped my td6 in for a 4,4 on lpg and find it a lot smoother ,quieter and quicker and its cheaper to run also

Iv got a 2002 4.4 v8 bought it with a LPG kit on it, iv got a BRC kit.
Gas at the place we fill up is 67.9ppl, but then agen 5miles down the road is 84.9ppl (depends how much the garage can buy it for)

It's brilliant, nice and quick, v8 sound, better than doozle mpg.
Dont go on the read out on the dash.
I get a calculated 14mpg on a town run and about 16 on a motorway run, so at half the price of petrol and more than half the price of doozle it equivilates to 28mpg around town, and 32mpg motorway.

But at the same time it's still a 4.4 v8 so if you do decide to put your foot down to overtake for example, it will drink a lot in a very short amount of time.

Hope this helps

i'm currently running a romano lpg system in my 4.4 v8 and find i get 240 - 260 miles between fill ups. it has the 84ltr tank and never costs more than £50 to fill. you've got to bear in mind just because the tank is 84ltr you will only fill 80% of tank as a safety feature to allow room for gas to expand. Prinz is the best model for the l322 but comes at quite a cost in comparison to others. personally i would have bought prinz but the car rangie already had romano kit fitted!

OK here my 20p
have rebuilt 3 engines all at the 100,000-120,000 miles with cam chain failures due to lack of oil changes due to the converter telling the customer it can do longer periods between oil changes!
the amount of running faults caused by badly fitted conversions will drive you mad!
the main problem the remember here is the gas system can never run as good as the petrol the gas ecu is slower and causes plenty of phantom faults buggering up the ecu too.
have removed a couple of kits too due to random running faults.
i own a lse 4.2 i have degassed for poor running.
and i have a d2 4.6 which was gas converted which i have also just degassed as it was not quick enough to keep up with the engine at full throttle!

now bear this in mind when having a conversion.
if the gas ecu is locked you will constantly be in for engine management faults which be because of the gas system
if it is a open unlocked ecu ensure you have a regulator that can keep up with the engine demands

and if you drive it like miss daisy question one is why! and it will go further on a tank of petrol to gas

On the same vain, which year L322 is best to gas. Can a Supercharged L322 be gassed.

thinking of gasing my l322 tinley tech do the bigas system for p38 and l322 , i have a copy of the wiring diagram most of it can be plug and play once fitted you just flash the fuelmap onto the gas ecu for your vehicle and away to go
i have fitted tartarini ,romano and prins before and the vsi systems require a lot of soldering , but as the systems are getting better all the time you can now fit a plug and play loom for the injectors , the gas system picks up the petrol injector signals and converts this to the gas injectors -so cutting down on the amount of soldering

my local lpg is 65p litre
lpg all the way for me,its been on my 4.4 vogue 3 years massive saving on fuel ,installation cost was £2300 .

wil2813 said:

my local lpg is 65p litre
lpg all the way for me,its been on my 4.4 vogue 3 years massive saving on fuel ,installation cost was £2300 .

Click to expand...

me too its been on my one p38 for 9 years and never missed a beat

Sorry, I'm going to pick point:

OK here my 20p
have rebuilt 3 engines all at the 100,000-120,000 miles with cam chain failures due to lack of oil changes due to the converter telling the customer it can do longer periods between oil changes!

Click to expand...

Nothing to do with the LPG itself ... bad advice yes, but not the LPG. I suspect your more likely talking about Rover block V8's which generally need cam chain work at those sorts of mileages anyway. To me, the Rover block is an 80k - 100k service interval engine in terms of camshaft/chain/lifters. the 4.4 BMW M62 engine is a very different beast internally. It can go longer intervals, but personally I still keep it down to 10k changes.

the amount of running faults caused by badly fitted conversions will drive you mad!

Click to expand...

Agreed. The quality of workman ship in installations varies considerably. Good research is the key to finding a good reputation of an installer.

the main problem the remember here is the gas system can never run as good as the petrol the gas ecu is slower and causes plenty of phantom faults buggering up the ecu too.

Click to expand...

Disagree with this one a little bit personally, an L322 kit is going to have a multipoint injection system fitted these days. the fuel injection timing pulses are still calculated by the original engine petrol ECU, the LPG ECU then listens to the timing pulses and modifies them slightly in their length so the LPG input timing is matched. The LPG ECU shouldn't be any slower, as its the petrol ECU still doing the donky work to adapt fuel trim. i.e. fuel trim is tweaked at the same speed whether on petrol or lpg.

I do agree though that you can get errors if the LPG timing modifier is programmed wrongly so that the LPG timing pulses are so far off from the petrol ones that the engine ECU cant adapt. Although, the modern LPG ECU's seem to have an autocalibration routine which gets the LPG timing pulses very close to the correct values anyway. Should it really shouldn't be an issue to throw engine faults nowadays.

On the same vain, which year L322 is best to gas. Can a Supercharged L322 be gassed.

Click to expand...

Yes it can be gassed. Although, I've read that the 4.2 Jag derived engine may not have as hard valve seats as the 4.4 BMW engine and as such may be much more sensitive to the quality of the installation ... and long term if it does have softer valve seats, the engine life span may be reduced ( but by what amount I dont know ). You'd need to go reading up on it. Although there are plenty of jag engine conversions that have been done.

I have a BRC multipoint system on my subaru, has worked superbly for 40,000 miles.

A decent quality kit (Prinz, BRC) and a decent installer will get you a reliable installation that work well.

If worried about valves, fit an electronic flashlube kit as well. I have this on the Subaru. Flashlube is expensive at about £60 for 5 litres, but it lasts for ages... needs topping up maybe once every 2,000 miles in my case.

A supercharged Range Rover needs a hell of a lot of fuel when going full bore, and many installations do not have the necessary capacity. You ideally need a twin vaporiser system. Many installers will fit a system that is almost up to the job but not quite - this isn't necessarily a problem, as the good systems seemlessly switch to petrol if the LPG cannot keep up (my Subaru will do this when absolutely flat out), the other 99% of the time it works fine - so why spend all that extra money for the remaining 1%? If you tend to drive foot to the floor all the time, then it will get annoying I suppose.

The other thing to consider is that max power on LPG will be around 10-15% less than petrol, so a system that switches to petrol under full load is perhaps a good thing - that extra 15% may be handy during that badly judged overtaking manouver!!

Hope this helps your search. In summary, be prepared to pay more for the best system fitted by a really good installer, and you won't go wrong.

Cheers

Jerry

I also have a BRC system on my 4.4 HSE. Converted it when I bought the car in 2007. I agree that there will be insufficient fuel feed for the supercharged version as I do find that once I have only a third of a tank left, if I put my foot down hard, it struggles and seems to hold back. Flick to petrol and wahay! Would not be without LPG though and the system has been brilliant. Multipoint is definitely required. I have the 95 litre spare wheel replacement tank which means I usually get 76 litres in from empty. Paying 67p in Bristol currently with four garages within a mile of home. Go-autogas.co.uk will sell you a download for your satnav with prices if required. If you live in the south west then Countrywide Farmers give a good account-based fuel service with many sites open 24hours (access by key and pincode).

Still prefer driving my 1983 Series 3 SWB petrol in Marine Blue/cream!

Hope that helps!

i have an 04 l322 4.4 v8 it cost me over 2200 to get a top of the range prins fitted , i got my money back in 6 months and i dont have any faults ,hears my advice .go to prins direct and get them to do it ,it safer that way , i got a fat ****er in bletchly to fit it for me as he had a great name , hes a shower of **** and ripped me of , not only did he fit a small cheep tank he screwed in the presure cut of valve right in so i could get more gas in and wouldnt notice ,he also adjusted the ecu so the car would run leaner and burn my valves out ,so he wouls get the business in replacing them ,he a big fat cu*t and when i complained he took me in the office whare he had a big black base ball bat on his desk and told me he never gives money back ,well i am a machanic .ive worked on cars for my living most my life .im also 6ft4 and i never get ripped of , i can tell you i made that useless sack of sh*t pay another company put in a good tank and sort out all the problems the ****er did .ide still like to know how he can sit down with a base ball bat wedged up his ass . if you cant buy prins go to a company called micromise in luton .they are fantastic ,maybe even better than prins and they know there stuff ,they right there own software and have developed there own injectors which are amazing ,they sorted me out in no time and retuned my car back to how it should be ,it went like a rocket after .