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Old 03-10-2013, 12:54 AM   #1
DeclanM3
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Lpg

Hey Guys,

Has anyone done an LPG conversion to their E46? Specifically M3? I was speaking to a mate and he said that you get pretty much the same fuel consumption, a bit power and only have to pay 70cents a litre for gas! Seems like a no brainer when I currently go through 15L every 100km and have to pay $1.60 for petrol...

What do you guys reckon?
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Old 03-10-2013, 01:23 AM   #2
Davconelectric
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..

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Old 03-10-2013, 03:06 AM   #3
Alpine
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Have you ever driven an LPG car? Please don't ruin perfection.
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Old 03-10-2013, 03:41 AM   #4
DesiredM
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Why? Because taxi.

Nah but seriously I wouldn't, don't screw with a BMW and especially a M3 which is designed for premium unleaded anyway.
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Old 03-10-2013, 04:27 AM   #5
DeclanM3
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My mate has it in his taxi and loves it. I want more power so it's either LPG or a supercharger and I don't like supercharger whine...
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Old 03-10-2013, 05:12 AM   #6
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I think you're trolling for bites. But giving you the benefit of the doubt here:

- The M3 is a high strung performance car, they are finicky at the best of times. A LPG conversion involves a different tune, ignition leads have to be thicker, different spark plugs. Does that sound like something the S54 will be happy with?
- They need to be tuned regularly. The instant things start going out of tune, the car will run horribly.
- Falcondores have basic engines designed to last nearly forever and run into the ground, so they're more receptive to anything.
- Do you know how heavy those LPG tanks are? That'll negate the whole performance side of things.
- Have you factored installation costs? I'm willing to suggest that you will have to really rack up the miles before you start seeing a return.
- Also when the tune goes out of whack, that's when the backfires start and airboxes start imploding.

For the minor savings, added weight and headaches it's not worth it mate.

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Old 03-10-2013, 05:21 AM   #7
DesiredM
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Lol if you wanted fuel economy you should have got a 318i and lived with the fact it's slow as balls.

Honestly I know this is a troll but either way if you did it or not we would all come and burn your car or laugh when you pull up to a LPG tank to fill your car.
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Old 03-10-2013, 05:54 AM   #8
ating
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Keep the M3 as is and get a second car as a daily, or 50/50 car.
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Old 03-10-2013, 06:40 AM   #9
CortinaD
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Sell m3 buy a Prius.
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Old 03-10-2013, 06:48 AM   #10
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Buy a taxi.
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Old 03-10-2013, 06:57 AM   #11
DeclanM3
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Quote:
Originally Posted by Goondaddy View Post
I think you're trolling for bites. But giving you the benefit of the doubt here:

- The M3 is a high strung performance car, they are finicky at the best of times. A LPG conversion involves a different tune, ignition leads have to be thicker, different spark plugs. Does that sound like something the S54 will be happy with?
- They need to be tuned regularly. The instant things start going out of tune, the car will run horribly.
- Falcondores have basic engines designed to last nearly forever and run into the ground, so they're more receptive to anything.
- Do you know how heavy those LPG tanks are? That'll negate the whole performance side of things.
- Have you factored installation costs? I'm willing to suggest that you will have to really rack up the miles before you start seeing a return.
- Also when the tune goes out of whack, that's when the backfires start and airboxes start imploding.

For the minor savings, added weight and headaches it's not worth it mate.
Trollololol. You got me! I'm quite happy with my 15L ever 100km usage. I'm never going to stop driving my car properly (read: like it's stolen) just for the sake of a few bucks!

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Old 03-10-2013, 07:28 AM   #12
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Ive converted mine to LPG and I plan on getting a TAXI light also
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Old 03-10-2013, 07:36 AM   #13
DeclanM3
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Ive converted mine to LPG and I plan on getting a TAXI light also
Where are you going to put it? Boot?
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Old 03-10-2013, 03:01 PM   #14
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On a serious note, when I was younger I actually owned an XD Falcon with a 351 that was solely on gas not 50/50. It had been completely stripped down, reworked and rebuilt with gas in mind with a pure gas injection system, can't remember the name as it was ages ago. But I must say it did go well and I was extremely happy with it at the time. I never had it dyno'd back then, but it used to keep up with all my mates v8's who were running petrol and still had the torque to pull a big boat behind it as well.
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Old 03-10-2013, 03:54 PM   #15
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This sounds like a discussion for another country so my experience my not apply, but here in the US a CNG or LPG conversion doesn't quite involve those extreme tradeoffs. We have quite a few non-taxi vehicles that are CNG and they drive identical to petrol gas vehicles.

The conversion is EXTENSIVE for a car like the e46. Probably the biggest investment will be in the DME. Because of the nature of the fuel and that it puts out fewer BTUs of heat energy as compared to petrol gas. Injector pulse width and ignition timing has to be dramatically adjusted. Somebody is going to have to manually adjust all those values. Otherwise you'll need tanks, plumbing, dryers, and pressure transducers. The tanks surprisingly don't weigh as much as you think. For safety reasons, here in the US they're all composite (fiberglass). You can get carbon fiber ones if you wish. You also will need A LOT of tanks to get equivalent range between fuel ups. Expect to lose your entire trunk to tanks, and even then you won't have the full 400 mile range.

They also have some weird quirks. Because the gas pressure increases as ambient temp increases, they have to be fitted with safety bleeders. They don't activate very often so you don't have to worry about money automatically be ejected. However, when they activate they sound like a broken fan belt and they shake the whole car. There's also a dryer that separates the water from the gas, which will make a similar noise during purging. And in the engine, the pressure has to drop from the tank pressure (3000 psi) down to the fuel injector optimized pressure (50 psi). The pressure transducer, which is the part that drops the pressure, forms ice on its surface due to the extreme cold of dropping pressure.

I am in agreement about the concerns with premium fuel. I have no clue how anyone would figure this out, but its a big concern in a high compression motor like the S54.

Incidently, one of the big tuners converted a 330i e90 to LPG and it worked great, so its do-able.

Not sure if this helps, just wanted to add in some less speculative info to the discussion
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Old 03-10-2013, 05:13 PM   #16
selien
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Originally Posted by DeclanM3 View Post
Where are you going to put it? Boot?
Just like Europe, behind the windshield
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Old 03-27-2013, 10:58 PM   #17
braaang
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lol, realistically not the worst idea suggested - just lose some boot space

if you go LPi, where the injectors squirt liquid propane into the intake, you'll even pick up some hp.

or you can whack on a banga gas research carb with twin lines.
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Old 03-28-2013, 12:32 AM   #18
Shinraaaa
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Got a 320ci with lpg installed, Took months of fine tuning. Donut tank in the boot for space where the spare wheel was supposed to be stored.
Great for daily/cruiser, Good on price etc. I wouldn't recommend it if you arent ready for some hiccups.
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Old 03-28-2013, 12:40 AM   #19
Mitch E46
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I'm converting my car to Avgas to save cash...wait a second.
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Old 03-29-2013, 11:41 PM   #20
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I'm converting my car to Avgas to save cash...wait a second.
How? You don't have a civic?
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