Go LPG! Research

Converting the mighty BMW V12...........

The BMW V12 range are magical cars offering lots of comfort with amazing performance. They make ideal conversion candidates as they have relatively high fuel consumption and bags of space for a tank. Go LPG! bought a car specially to research and develop what is one of the most challenging conversions on an 80's or 90's car. The car is pictured below.

All BMW V12 cars are catalysed. The engine was derived from 2x 2.5 litre 6 cylinder engines. It is managed by 2x separate Motronic ECU's as used in the 6 cylinder cars, united by a central 'hub' unit. The Throttles are 'fly by wire', there is no physical link with the driver's foot.

The management system is very sensitive to anything that it 'sees' as a potential engine problem and is programmed to limit the car's performance by going into 'Limp Home' mode in such cases. When in limp mode, the engine will refuse to 'rev up', whilst the gearbox will be limited to 3rd gear and reverse only. This has great significance to an LPG converter because if the management system detects anything that could be construed as a fault by the ECU's (e.g petrol injectors not firing whilst running on gas) then the car will go into limp mode although there is no actual problem. This is most undesirable for the driver. One of the reasons we bought our own car to convert initially was to use it as a test bed, researching and tackling the causes of errant limp mode selection. Once that was done, we had to come up with 'fixes'. We were very successful with the project and can now assure owners of problem free BMW V12 / LPG motoring.

Early V12 cars

These engines can be converted very well with OPEN LOOP LPG systems because their standard ignition system is so well designed. NOTE that it is NOT correct to call this installation 'Single Point', as it must be dual (or twin) point. The twin 6 cylinder banks of the V12 require it to be treated as TWO separate engines if done properly, meaning that two components (e.g gas mixers, vaporisers) must be used instead of one for a 6 cylinder conversion.


The increased amount of equipment fitted, the difficult and cramped working conditions take their toll in terms of time spent. We can convert THREE 6 cylinder cars in the time it takes to do ONE 12 cylinder.

That said, Go LPG are happy do the job for you, and do very well. The Earth shattering performance available in 'sport' mode will be just as good on gas. More mild driving will reward the owner with effective fuel consumption of over 40 mpg ( where petrol is taken as 2.4 times the price of lpg and 2.4 x 20 petrol mpg = 48 effective mpg ).

With a cylinder tank (shown later) the open loop conversion cost is 1950 inclusive.

Later model V12 cars

There are two ways to do this job -

1. Closed loop single (Dual) point system.

These engines can be converted very well with Closed loop LPG systems because their standard ignition system is so well designed. NOTE that it is NOT correct to call this installation 'Single Point', as it must be dual (or twin) point. The twin 6 cylinder banks of the V12 require it to be treated as TWO separate engines if done properly, meaning that two components (e.g gas mixers, vaporisers, fuel management units) must be used instead of one for a 6 cylinder conversion.

The increased amount of equipment fitted, the difficult and cramped working conditions take their toll in terms of time spent. We can convert THREE 6 cylinder cars in the time it takes to do ONE 12 cylinder.

That said, Go LPG are happy to do the job for you, and do very well. The Earth shattering performance available in 'sport' mode will be just as good on gas. More mild driving will reward the owner with effective fuel consumption of over 40 mpg ( where petrol is taken as 2.4 times the price of lpg and 2.4 x 20 petrol mpg = 48 effective mpg).

With a cylinder tank (as shown) the closed loop conversion cost is 2250 inclusive.


2. SGi (Multi point sequential injection) system.

The problem here is that conversion equipment manufacturers are like any other, they make the things they can sell most of. Sadly, this means that none of them make 12 cylinder conversion equipment because so few 12 cylinder cars are currently in production. Large volume maufacturers make none at all, Jaguar and BMW withdrew their V12 engines a while ago. As a result of this tiny V12 market only 3, 4, 5, 6 and 8 cylinder SGi systems are made by the major LPG equipment manufacturers. Where does this leave the V12 owner?

At present, there are 2 ways to get around this problem - Either;

Use the 'Bigas' SGi system which uses a 6 cylinder ECU to fire 2 injectors at once (making 12). It is a solution but beware that the ECU manufacturer AEB will NOT warrant the ECU against any fault as it is being 'overdriven' (being put to a task it was not designed for). Likely cost for this system is around 2450 with a single cylinder tank and you get no ECU warranty.

-OR-

Have 2 x 6 cylinder SGi kits fitted to work in tandem (remembering that we have to buy 2 complete 6 cylinder front end systems, fit them and wire them up in tandem) and run both from a single switch and tank. This is the best way to do the job by far, but bear in mind that the cost of a 6 cylinder SGi conversion is 1800, and you'll be having TWO of those (save the second tank and filler).

Cost of the 2x6 SGi conversion is around 3,200 with a single cylinder tank.

So, if you want your V12 converted and have read the above, then call Go LPG. We will recommend the best conversion system for your car and your needs. We have more experience with V12's than most converters.

One thing you can be certain of ......LPG Fuelling of your V12 engine will save you an absolute fortune..........


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conversion of your BMW V12

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