Maserati Gran Turismo LPG converted Autogas conversion

Maserati Gran Turismo LPG converted Autogas conversion

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SimonYorkshire

Original Poster:

763 posts

117 months

Wednesday 19th July 2017
quotequote all
Costs less to run than a little diesel car now ;-)

This is what it looked like work in progress with the engine covers off.



engine covers on



tank



filling point (brass bit unscrews leaving the filler boss hidden behind the petrol filler flap)


SimonYorkshire

Original Poster:

763 posts

117 months

Thursday 20th July 2017
quotequote all
jakesmith said:
Nice easy access to the battery too in case you need to do the emergency handbrake release procedure / attache a charger! And with a boot that big, you'd barely notice the space gone!! smile /

Right few questions...
1) WHY
2) How much
3) What MPG do you get?
A jumper / charging cable for the battery was attached before the tank was fitted, it is in the storage tray in the rear of the boot and is easily accessible. The battery wouldn't be so hard to change, the tank was fitted in such a way that it can be removed without too much difficulty... granted not as easily as without the tank fitted but easily enough considering how often the battery will need to be changed. First time I've heard about the emergency handbrake release procedure,.. I don't know if you refer to a problem with Maserati's handbrake design or more a case of the handbrake release won't work without battery power? But we can provide battery power even with a dud battery. The tank does take a lot of the boot space but that's because the boot space was so small in the first place. On that note could also ask why the rear seats... they would be a bit cramped for rear passengers!

1. Because 'It costs less to run than a diesel car now'... It isn't the most economical car so it pays to run it on half price fuel, and it still performs the same on half price fuel.
2. £1900, which will be recouped in terms of money spent on fuel alone after the owner has used 700 gallons of fuel.
3. It does about 10% mpg less running on LPG compared to running on petrol, but LPG costs less than half price so the vehicle costs half price to run in real terms.

I posted pics of this Maserati Gran Turismo LPG conversion on another forum which were noticed by a celebrity who lives on Malta. The Malta guy has decided he wants an LPG converted Gran Turismo too to use on Malta, he will be sourcing a Gran Turismo in the UK, have me convert it to LPG and then import it into Malta where he will also pay half price for fuel but also vehicle regs in Malta mean he won't have to pay as much in taxes to run it compared to if it only ran on petrol.

Kyodo said:
I'm not trying to sound daft but does it need a safety sticker on the back saying it has a big gas canister in the boot?
No. Do petrol cars need a big sticker on the back saying there is a big tank full of petrol underneath...?

User33678888 said:
+1

Is the fuel cost really a big factor when you choose to run something like this?
I'm sure it won't be doing the residuals any good.. How much do you really expect it to save you over the time you run it?
Firstly this isn't my car, it is a customer car, the customer approached me to convert the Maserati on the basis I have the best reputation for converting cars especially performance/demanding vehicles. On the basis of '700 gallons of fuel', if the car does 20mpg the break even time would be 14000 miles. The owner is toying with the idea of starting a performance and luxury car hire business and believes customers may be more likely to hire such cars if they only have to pay half as much for fuel, but until he starts such business he is enjoying the benefits of half price fuel himself/directly. For now, this is his daily driver and he will certainly cover more than 14000 miles in a year, so payback period is less than a year.

To some purists the LPG conversion might effect residual values negatively, but the system is fitted in such a way that the car could be put back to standard without much difficulty. To other people who would like to own such a car the cost of running it on petrol might be considered a negative, so to those people the LPG conversion would add value. All arguable points and nobody here can say how LPG conversion of a Maserati will effect residuals... But put it this way - If the owner runs the car on LPG for long enough, even if the conversion does negatively effect residuals he will still be better off. Long enough might be less than a year in case the LPG conversion adds value to residuals, or a few years if conversion negatively effects residuals.



Edited by SimonYorkshire on Thursday 20th July 13:41


Edited by SimonYorkshire on Thursday 20th July 13:45

SimonYorkshire

Original Poster:

763 posts

117 months

Thursday 20th July 2017
quotequote all
Thanks for your posts so far Jake and all.
I didn't know about the emergency handbrake release procedure, do they go wrong often?
Had no reason to try siting in the back!

Simon

SimonYorkshire

Original Poster:

763 posts

117 months

Friday 21st July 2017
quotequote all
Thanks again, Jake.

Pork said:
I can see the merit in doing this, absolutely, but for me, the loss of very valuable boot space would rule out this as an option.

Are there any 'smarter' ways to do the conversion and avoid taking boot space ? I,e. Could you replace the existing fuel tank with the lpg tank?
It would be impossible to mount the LPG tank much differently on a Gran Turismo due to the vehicle's design. There's a vast range of different diameter and length LPG cylinder design tanks (of which the owner opted for this tank under my advice regards compromise between tank and luggage capacity and access to the lower stowing chamber which houses the jump cable).

On most vehicles a donut shaped tank is fitted in place of the spare wheel, the owner can then decide whether to still carry a spare wheel at all (instead carry instant tyre repair canisters and a small 12v compressor), carry the standard spare wheel or perhaps carry a space-saver spare wheel (even if the vehicle model normally carries a full size spare). Of these options most owners choose the instant tyre repair and compressor option. It would be possible to fit a toroidal design tank inside the boot of a Gran Turismo but we decided early on that a cylinder design would offer the best set of compromises.

It is unusual to be able to fit a smaller petrol tank and fit an LPG tank in a similar position, such options are usually only possible on a limited range of 4x4's. Modern vehicles tend to have very odd shaped petrol tanks while LPG tanks have to be either cylindrical or toroidal due to being a pressure vessel (which requires the strength provided by a round design).

mattnovak said:
How can you do 14,000 miles a year on Malta??!! It's tiny. Unless you did shifts and it never stopped running...
Perhaps he'll be ferrying to elsewhere ;-) Or maybe he doesn't do many miles but the LPG conversion will be worthwhile for the tax break I mentioned.

Simon

SimonYorkshire

Original Poster:

763 posts

117 months

Friday 21st July 2017
quotequote all
Hedgetrimmer said:
Each to their own. Although the installation looks very neat, you would need to be prepare for a long term relationship with the car as the eventual buyer will be way off the normal distribution of a typical Maserati GT buyer:-)

The 4.2/4.7 gets hot at the best of times so how well does the engine cope with gas?
Yes, I reckon you're right... the typical Maserati owner probably won't even think to consider an LPG conversion, it would be way off the cards, any such mod sacrilege etc.. Others on thread have said much the same thing and I can agree with it because I think the typical owner is likely to be a purist.

There are misconceptions about engine heat. The engine only makes power at all because of heat expansion of gases in the combustion chambers, more heat in combustion chambers and the engine makes more power so that would be a good thing... But that doesn't necessarily mean the engine block gets hotter because engine block temp is of course controlled by the cooling system and thermostat. The addition of an LPG system actually aids the cooling system, because the LPG is stored as liquid in the tank and there is a cooling effect when the gas is atomised within the system's pressure reducer. The pressure reducer would turn into a block of ice very quickly were it not plumbed into the vehicle's coolant circuit, which provides heat to keep the pressure reducer warm and on the flip side cools the coolant.

gareth h said:
I had a Monaro converted many years ago, ran well on LPG, power was down by about 10hp when I rolling roaded it.
My only concern was the effect of a pressure vessel in the crumple zone, in the event of a rear impact would the tank be shunted into the rear passengers? In the end the fact that the rear seat passengers were my kids was enough to persuade me to move it on.
I've converted plenty Monaro's too, there are threads on some I've converted on Pistonheads, most threads started by the owners. Various options on where/how to fit tank(s)s on Monaro's. If the tank takes place of a spare wheel then surely the spare wheel would be in the crumple zone anyway? There are cars with the petrol tank right behind the rear seats such as Jag XJ's. Crumple zone effectiveness and gas tank safety are points that have been raised often on other forums. I think it would be difficult to say without running extensive crash tests on how gas tank install would effect crash safety - would a solidly mounted tank behind the rear seats be a help or a handicap in crash? Towbar? Luggage? It would probably depend on the specifics of the crash. Autogas tanks are much stronger than a petrol tank and are unlikely to be ruptured even in a severe crash, but if they do rupture the gas isn't poisonous (although like any gas it is an asphyxiant) and LPG has a far narrower range of explosive mixtures than petrol. I think you can look at it a few ways: I like Monaro's, no criticism of choice of car, but you're probably more likely to get rear end shunted in a Monaro than in an average car anyway - situation with the boy racer up your backside trying to gode you into a race etc..

Your post ties in with Hedgetimmer's post on the subject of engine heat. Your Monaro probably made 10bhp less on LPG because the calorific value of LPG is very slightly lower than the calorific value of petrol, while at the same time the stochiometric ratio of LPG is a bit higher than the stoch of petrol. The figures mean that for every gram of LPG you put into the engine you get a bit less heat than would from a gram of petrol, and not only that but you can't put as much LPG through the engine as you could petrol. So the total heat the engine can see while running on LPG is lower than the total heat the engine can see when running on petrol. However we can then talk about how this heat is used / distributed inside the engine and this touches on burn speed. If burn speed is much slower on LPG than on petrol there could be a situation where more heat is present/remaining during the exhaust cycles, which would then impart more heat to the exhaust valves. Not something we generally have to worry about / address, since most of the burn on a petrol / LPG engine is completed during the first bit of the power stroke, but could become a problem if we set open loop mixture wrong. Good installers don't set open loop mixture wrong! Some engines have valves made from softer metal than usual, soft valves can be an issue for LPG conversions - I just answered a potential customer's question on this subject, to prevent wrist ache I've simply copied and pasted my reply to his question below.

my reply said:
I always fit valve lube systems on anything Japanese including all Elgrands, a lube system is included in all my Elgrand conversion quotes. The issue with Jap vehicles (and Fords and a few other marques) is that the metal that engine valves and seats are made from is softer than on most other vehicles. When you run on petrol some soot is produced and this soot acts a bit like a lubricant between the valve and it's seat, protecting valves and seats (particularly softer ones) against wearing faster than they would without the soot. LPG burns very cleanly indeed and produces no soot, which is generally a good positive in terms of protecting every other part of the engine, since soot can (on the flip side) act like a grinding paste when it is in engine oil, so soot in oil has opportunity to cause quicker wear to the engine 'bottom end'. But lack of soot on valves/seats that are a bit softer than average can cause quicker wear of the valves/seats. The lube systems very slowly drip feed a special oil into the engine's intake system, the oil atomises in the air which goes passed the engine inlet valves on the way into the engine and directly lubricates them, then the oil is burned inside the engine's combustion chambers and produces a little soot as it burns, this soot then builds on the engine's exhaust valves/seats and protects them in much the same way as the soot produced when burning petrol would. The lube fluid is used very slowly, you use only 1 part lube fluid to every 1000parts fuel, so a litre of lube fluid costing £15 will last as long as 1000 litres of LPG.
Simon

SimonYorkshire

Original Poster:

763 posts

117 months

Wednesday 26th July 2017
quotequote all
Well, if the car doesn't normally have a spare meaning it's not possible to fit a tank in place of the spare and you need every bit of luggage capacity, better not convert to LPG as the tank would take some of that capacity meaning you wouldn't get all your luggage in ;-)

Tank installs are not generally homologated for specific vehicles but any tank that any installer fits will carry E67 approval, meaning it is approved Europe wide for the purpose of fitting in road vehicles. There are cases of the type of homologation you'll most likely be referring to, such as in the cases of factory converted vehicles like the dual fuel Vauxhalls, Fords, Subarus, etc etc. The term 'factory converted' is misleading really, because none are converted by the factory that manufactured the vehicle; the usual case is that the newly made vehicle goes straight from the factory to a specific installer who fits specific LPG parts that are homologated on that vehicle. A step away from homolgation in that usual sense, there is a process whereby manufacturers of LPG systems can pay for a type of homologation with their specific system on a specific model of vehicle, where regardless of which installer then fits that system on that model vehicle the vehicle can then easily be registered on the 'Powershift register' and the vehicle then becomes congestion charge exempt..., but no LPG system manufacturer has done this for several years due to the expense of homologation and perhaps also due to the rising number of manufacturers who produce engine bay components for vehicle LPG conversions (less market share for each manufacturer, less incentive for any one manufacturer to pay for it). But I do believe that homolgation has been passed (for want of a better term) in every case where manufacturers have paid for the process of homologation testing, and since there is such a wide range of 'factory converted' LPG vehicles on the road, covering a wide range of tank setups, I would read into this that homologation authorities find no need for concern on E67 tanks fitted to vehicles in general.

It is illegal to take a converted vehicle through the chunnel, which begs the question why, then, is it legal to take a full E67 tank or indeed a full camping gas bottle through the chunnel if that container is not part of an autogas install...! I know of people with converted vehicles who take the chunnel regularly and with head held high, I can agree with the common sense that says an E67 tank is much safer to take through a tunnel than a camping gas bottle, and they don't seem to worry about getting caught and paying a fine, in the unlikley event they were caught out they might play daft and get away with it. Others take the ferry.

At least the rest of my post is meant to be received as a bit tongue in cheek...

I've gone with your questions which my answers paragraphs above hopefully answer, even though I suspect a case of you probably already knowing the gist of answers to your questions but playing devil's advocate a bit ;-)LPG conversion won't be for all for sure, a Gran Turismo is an unusual vehicle to be tasked with converting but I'm not sure there wouldn't be a similar number of owners who would consider an LPG conversion / number of owners who find that if they pack the car to the limit they can carry everything they need to go touring with a family of 4, no more or less, and wouldn't consider buying a fast estate car for the next year's touring! ;-) I've converted Audi S4 and RS4's too, my last conversion on one was a long time ago though... but I remember the engine bay being far more cramped on those models than on the Gran Turismo.

Regards to all,

Simon

Edited by SimonYorkshire on Wednesday 26th July 18:44

SimonYorkshire

Original Poster:

763 posts

117 months

Thursday 27th July 2017
quotequote all
jakesmith said:
I'd love to see a picture of that becuase I just can't picture it. I put one case that is slightly larger than a cabin case in the boot and there is little other space. No idea where the pram would go!?
On the roof rack and in the trailer Jake? Yes I'm kidding ;-)

I'm a bit of an outsider here, Andrew, so I wouldn't think fit to ponder change of a vehicle name that others may feel attached to. Anyway, there may be a bit of disbelief if you return from a trip and tell others you've been flying around Europe in ET! My sister and great aunt are/were the language people in our family (aunt 13 languages / Bletchley Park, just as good at maths too)... but I Googled Esteso just in case! The LPG tank does add a lot more range, though. The exhaust note is indistinguishable from running on petrol.

Simon

SimonYorkshire

Original Poster:

763 posts

117 months

Friday 28th July 2017
quotequote all
Murph7355 said:
SimonYorkshire said:
...
I've gone with your questions which my answers paragraphs above hopefully answer, even though I suspect a case of you probably already knowing the gist of answers to your questions but playing devil's advocate a bit ;-)...
Thanks Simon. Appreciate it.

I thought I knew some of the answers, but was worth checking. As noted, it seems a barmy conversion to do on a GT to me. But each to their own smile

Do any LPG tank makers do kits that simply replace the standard fuel tank? Or is the pressure such that that wouldn't work?
LPG tanks have to be cylindrical in shape (even a spare wheel toroidal tank design is a twisted cylinder) indeed because they are a pressure vessel (rounded shape is best for strength), petrol tanks are not a pressure vessel so don't have to conform to the same shape restraints - very few modern vehicles have a petrol tank shape that an LPG tank could replace. We wouldn't want to replace the full petrol tank with an LPG tank without fitting another (perhaps smaller) petrol tank anyway, converted vehicles start on petrol when the engine is cold (can be started on LPG but not advisable and best left for an emergency such as if the petrol pump breaks), even if they started on LPG with a cold engine most owners would prefer to keep the ability to run on petrol. For a limited range of mostly 4x4 vehicles smaller petrol tanks are purpose made to allow an LPG tank and the smaller petrol tank to fit in the same space as the original petrol tank.

There isn't a massive amount of pressure in an LPG tank, pressure rises and falls with temperature but even on a summers day pressure might only be around 10bar. LPG tanks aren't like you see in films where someone shoots the tank with a high powered rifle and the tank explodes or shoots off due to the trust of gas escaping from the bullet hole.. I have removed valves from tanks that are full of gas, thus opening a 70mm diameter hole in the full tank! All that happens is gas squirts out very quickly for a few seconds before the flow slows right down and almost stops well before all the gas has emptied - When gas escapes from the tank it has the effect of cooling the tank and when the temperature falls the pressure decreases (low pressure less squirt)... Very soon you can look through the 70mm hole in the tank and see the cold liquid gas, could even pour it between containers as you can with water in this state. LPG isn't to be confused with CNG which is stored as a vapour (not liquid) and at very high pressure, CNG tanks are stronger than LPG tanks but very much heavier. An LPG tank is nothing like a 'bomb in your boot' or 'a bomb mounted under the car' as some people seem to think, they are designed to take crash damage without bursting, can be severely deformed without bursting, and even if they do burst you only have the effect I just described. CNG is a different thing entirely, stored as a very high pressure vapour thus no cooling effect if the tank were to burst and 2000psi pressure means if the tank suffered a one inch hole it would give the tank 2000 pounds of thrust (so if it were not securely mounted it really could take off under it's own thrust, but it still wouldn't explode)! Then again, CNG tanks are even stronger than LPG tanks. Both are very much stronger than petrol tanks. All E67 LPG tanks / fittings feature an over-pressure relief valve that automatically opens to vent gas above pressure of around 40bar, if this opens the gas is vented externally of the vehicle even if the tank is fitted inside the vehicle. If that valve were to fail the tank still wouldn't burst, the tank is designed to stretch at extremely high pressure rather than burst. They all have a thermal fuse which in the event of a fire will open to allow a controlled flow of gas out of the tank, again externally of the vehicle. When you compare all this to a petrol tank, plus the fact that LPG is explosive at a very narrow range of mixtures with air compared to petrol, it is no wonder that insurance firms consider LPG tanks as safer than petrol tanks.

Simon


Edited by SimonYorkshire on Friday 28th July 13:32

SimonYorkshire

Original Poster:

763 posts

117 months

Friday 28th July 2017
quotequote all
911Thrasher said:
14,000 miles before you break even...only then you might start saving a couple bucks - bonkers!

In all seriousness, if you can't afford the fuel bill for one of those, don't buy one, and i can't even start thinking of where else the owner must be corning corners on that car...servicing maybe?!?

Want to see the face of the mechanics when the owner takes it back to Maserati for its annual service lol.
People can accurately see from my figures how much the conversion can save the owner. What they can interpret from those numbers is that in respective terms for every 14000 miles after the first 14000 the owner effectively gets 7000 miles free of any fuel costs. If you think of that as only being 'a few bucks' that's fair enough, but other people will see that as a substantial saving. We could apply the same approach in many subjects such as energy bills for running a house (could be said that preferring to pay a lower energy bill for running a house is the wrong approach, should have bought a smaller house rather than swap energy providers), or in business (don't like paying that supplier's bill, should be in a different business, saving a couple of bucks by switching to a different supplier won't save much)..I am often tasked with converting really powerful / special vehicles, but I am just as often tasked with converting run of the mill vehicles that might achieve 30/40mpg as standard (LPG then makes for 60/80mpg in equivalence running costs) and I don't need to charge as much to convert those vehicles so the payback time is about the same.

Maybe the owner does intend on servicing the car himself at home or getting other than a Maserati dealer to service it for him, I don't know. I can see the arguments about residuals but again if the owner intends keeping the car long enough he might be better off not using Maserati dealers. Just because it's a Maserati doesn't make servicing rocket science so there's different ways of thinking about what 'cutting corners' means in terms of servicing too.

Yes I'd bet Maserati mechanics would/will do a double take when they see the install but none of it will affect their service procedures or even diagnostics when it is switched to run on petrol.

Simon

SimonYorkshire

Original Poster:

763 posts

117 months

Friday 21st September 2018
quotequote all
Update on this.

The owner of this Maserati swapped it for a Bentley with the W12 engine. The ex owner of the Maserati wants me to convert the Bentley to LPG at some point.

The new owner of the Maserati was impressed with how the vehicle ran identically on LPG compared to running on petrol, still he didn't want the car to have the LPG system fitted when he took possession, so the ex owner had me remove the LPG system.

However, the new owner has since changed his mind and asked the ex owner to have me refit the LPG system.... Which I have just done.

Seems difficult to believe but all true!

Same superb conversion results as last time I converted it.

SimonYorkshire

Original Poster:

763 posts

117 months

Monday 4th July 2022
quotequote all
Converted a few more Granturismo's since my last post on this thread.

SimonYorkshire

Original Poster:

763 posts

117 months

Tuesday 5th July 2022
quotequote all
markiii said:
Be lucky to get any lpg these days
Sorry that's wrong, LPG is easily available in most areas. I fill up 3 cars per week. I have filled up 3 vehicles per week with LPG for the last 20 years, all at local forecourts.

Many Morrisons forecourts sell it, many of the franchised Shell, BP, Esso, etc stations are still selling it, there are new independents springing up to cater for taxi drivers whom are granted the same emissions zones concessions that electric vehicle taxi drivers enjoy... and they are usually open to the general public. Of course taxi drivers prefer LPG over electric... You don't want to have forced stops (for recharge) every couple of hundred miles when you could otherwise have a paying fare or don't know how many miles your shift might take you.

Not long ago there were some problems getting LPG, it was jointly due to 'activists' blocking fuel depots and LPG suppliers prioritising home heating customers, while at the same time home heating customers were buying unusually large quantities to beat the impending fuel prices. Also at around the same time there was a shortage of petrol and diesel - and LPG users filled up at forecourts that had completely run dry of petrol and diesel but stlll had LPG in stock. And they could all use LPG or petrol, not just limited to one or the other, though of course they preferred to refuel with half price LPG.

If you live in an area where LPG isn't available from a local forecourt you might live 'out it the sticks'... Just the kind of areas in which a lot of premises don't have a mains gas supply and many homes use LPG for home heating etc. Simply ask a gas supplier to deliver gas to your home.

Honestly - The 79.7p per litre I now pay seems very steep. It is the absolute max I might have paid (out of principle) not long ago, But compared to £2 per litre for petrol it's a no brainer. And compared to an EV that will become old tech and depreciate in no time (if some reports are to be believed) it's a no brainer. Especially if I need a vehicle that is capable of towing a large caravan for 350 miles without needing to stop to recharge/refuel for so long that it doubles the journey time and especially if I want to own the vehicle I drive instead of leasing.

That said, I don't so much mind EV's coming along. The charging infrastructure that some magic balls predicted would be here by now still isn't here but I could make a system that charged an EV anywhere - An onboard generator that runs on LPG. And I could maybe make that generator charge the vehicle while it is being driven.. Set off with 100% charge and maybe arrive with 100% charge without having to stop to recharge.

Edited by SimonYorkshire on Tuesday 5th July 23:01


Edited by SimonYorkshire on Tuesday 5th July 23:03