Jump to content
SAU Community

Recommended Posts

What is your LPG fuel consumption.

Driving style

Mostly sedate.

At what rpm is a standard turbo supposed to kick in?

Apoprox 90% highway and 10 % city.

I average 6.1 km/litre.

I think I have a LPG consumption problem. What do you think?

Edited by samuri
Link to comment
https://www.sau.com.au/forums/topic/361281-m35-series-1-lpg-fuel-consumption/
Share on other sites

You have the svi system right?

I got the jtg system and I'm getting around 5-6 km per litre, or around 18 to 20 litres per 100km mostly city driving lol. And my system is supposed to be better then svi. Go figure...

I have my 1000km service this week. Hope they find a leak...

oh my driving style is...fairly spirited? :rofl2:

Edited by ironpaw

got JTG here too.. getting about 17L per 100 all city.. little bit better with propane.. if i give it a hard time i can get up to about 20.. no big deal.. 56c per litre to fill.. im thinking about putting it on a dyno to check mixtures cause i reckon its running rich.. if it is then its more power and economy to come. anyways loving my gas especially with all this middle east unrest.

  • 2 weeks later...

Hey Sage I was down at Seaview the other day getting my 1000km "service"...they mentioned you were there the day before.

Darren said he's looking to put our cars on a 4wd dyno and fine tune the gas? Did you ever get back to you?

I'm looking at getting bigger gas jets/calibrators so I can run higher boost...

first ive heard of it mate.. would love to organise it.. maybe we could do both our cars at the same time? mine has been flawless other than occasional misses on the freeway.. they believe that the gas could be vaporising in the lines.. 1 line feeding 1 bank is pretty close to the turbo so they are going to shield it for me..

first ive heard of it mate.. would love to organise it.. maybe we could do both our cars at the same time? mine has been flawless other than occasional misses on the freeway.. they believe that the gas could be vaporising in the lines.. 1 line feeding 1 bank is pretty close to the turbo so they are going to shield it for me..

hmmm...I've had quite alot of issues. Never mind it seems its drinking the stuff at 20L/100km, but every morning when I start the car during the LPG switchover my car will stall without fail.

It will also stall/splutter/cough during switchover randomly. I've learnt to not drive the car until switchover is complete and the AFM is showing proper figures. There's been a couple of close calls when I started driving, then the gas kicked in and the car stalling on me...:yucky:

TBH its more of an annoyance....I can't complain too much doing 250awkw @ 57c per Litre....

Edited by ironpaw

jesus 250awkw.. sounds like our cars are not very much alike! mine only has a dump pipe nothing more.. my cutover to gas is usually completely seamless.. about 1 in 10 i will see a dip in revs for a split second though never stalled and only once came close when i was reversing up hill on a cold morning.. the guy out at seaview did say our cars were very different.. mine is a 11 month 2003.. whats your manuf date?

hope it all gets worked out mate.

  • 5 months later...

Just recently I have a high pitched beeping

sound in the M35 stagea, while driving.

It happens when the LPG indicator is on and petrol indicator is on at the same time.

it might happen aftr 25 minutes driving or 5 minutes driving,

Swicth to petrol and the noise disappears until you switch back to LPG.

Some hesitation also occurring when taking off at the lights.

Whats the cause.

How do you fix,

Is it going to do any damage and if so exactly what?

Hesitation will be running lean or rich, no way to tell without getting a wideband on it... Get it on a dyno or take it back to the LPG mob, there may be an issue with the reg or one of the injectors is blocked? LPG has a gooey substance as part of it, my dads patrol used to block up solenoids all the time, partly why I will never touch it. Perhaps it just needs a service?

I'm pretty sure he's running sequential vapor...

Yes I am running SVI.

A faulty water temperature sensor appears to be the problem,which will be replaced in a few days.

Apparently when 2 lights come on ,on the fuel gauge,

it indicates a fault and reverts to petrol.I have an EMER system.

Anyone else come across this problem?

I used to get hesitation at takeoff In the factory gas ford

Turned out to be the gas Itself causes wax build up

More noticeable when I used bp gas. They steam clean the solenoids or something then good until next service

  • 8 months later...

Any updates on LPG fuel consumption?

On a Melbourne -Brisbane return trip I got around 13.9 litre/100km, with luggage on the roof on my return trip with 4 passengers and luggage loaded with family.

The modification of a dump pipe seems to have given it acceleration like a rocket with the turbo winding up much earlier !

You guys getting 17-20 litres/100 (city cycle) seems a little high with the more efficient engine and more efficient liquid and vapour injection systems.

I have the age old Gas Research system on my C34 series 2 Stagea (R34 motor), and still get reasonably good fuel economy for a straight gas and 1850+ kg turbo wagon.

Highway cycle about 14.5 l/100

City cycle about 17.5l/100

The best I ever got was 12.5 l/ 100 on a trip.

A lot has to do with tuning and refining the a/f ratios across the rev range, I know my tuner spent a lot of time on the road and dyno doing this. I regularly go back say every 12 months for a check and adjustment of tune as part of the normal service schedule.

From my experience, a lot of tuners will set it up safe and rich, too rich for my liking, and there's really no need to be so conservative if the system has been selected, installed and tuned properly. Most of the LPG installers don't specialise in tuning either, so good to ask some important questions beforehand, including the forecast fuel economy.

hmmm...I've had quite alot of issues. Never mind it seems its drinking the stuff at 20L/100km, but every morning when I start the car during the LPG switchover my car will stall without fail.

It will also stall/splutter/cough during switchover randomly. I've learnt to not drive the car until switchover is complete and the AFM is showing proper figures. There's been a couple of close calls when I started driving, then the gas kicked in and the car stalling on me...:yucky:

TBH its more of an annoyance....I can't complain too much doing 250awkw @ 57c per Litre....

At that power level, I can see why you are getting around 20L/100!

Take it back to the place that installed it and get the changeover looked at, is it still under warranty?

That is a big safety concern on the road.

Curb weight for a c34 is 1650kg not 1850+kg

Might be correct for a factory C34 4WD on petrol, but with the added LPG gear and me in my car, it is close to 1850kg.

I'm a realist and always take the total laden weight on the road into consideration, as it is this minimum weight that the car needs to haul to enable a fuel consumption calculation. You may be different.

I see plenty of Australian Standard stickers on new cars boasting fuel economy of xl/100, but is it really obtainable? No, it isn't. Reading the basis of how these tests are conducted is an eye opener, they are not conducted under real world conditions at all.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I got back to Japan in January and was keen to get back on track as quickly as possible. Europe is god-awful for track accessibility (by comparison), so I picked up a first-gen GT86 in December just to have something I could jump into right away. The Skyline came over in a container this time and landed in early January. It was a bit battered after Europe, though—I refused to do anything beyond essential upkeep while it was over there. The clutch master cylinder gave out, and so did the power steering. I didn’t even bother changing the oil; it was the same stuff that went in just before I left Japan the first time. Naughty. Power steering parts would’ve cost double with shipping and taxes, so knowing I’d be heading back to Japan, I just postponed it and powered through the arm workout. It took a solid three months to get the car back on the road. Registration was a nightmare this time around. There were a bunch of BS fees to navigate, and sourcing parts was a headache. I needed stock seats for shaken, mistakenly blew 34k JPY on some ENR34 seats—which, of course, didn’t fit—then ended up having the car’s technical sheet amended to register it as a two-seater with the Brides. Then there’s the GT86. Amazing car. Does everything I want it to do. Parts are cheap, easy to find, and I don’t care what anyone says—it’s super rewarding to drive. I’ve done a few basic mods: diff ratio, coilovers, discs, pads, seat, etc. It already had a new exhaust manifold and the 180kph limiter removed, so I assume it’s running some kind of map. I’ve just been thrashing it at the track non-stop—mostly Fuji Speedway now, since I need something with higher speed after all that autobahn time. The wheels on the R34 always pissed me off—too big, and it was a nightmare getting tires to fit properly under the arches. So I threw in the towel and bought something that fits better. Looks way cleaner too (at least to me)—less hotboy, less attention-seeking. Still an R34, though. Now for future plans. There are a few things still outstanding with the car. First up, the rear subframe needs an overhaul—that’s priority one. Next, I need to figure out an engine rebuild plan. No timeline yet, but I want to keep it economical—not cutting corners, just not throwing tens of thousands at a mechanic I can barely communicate with. And finally, paint. Plus a bit of tidying up here and there.  
    • Nope, needed to clearance under the bar a little with a heat gun, a 1/2" extension as the "clearancer", and big hammer, I was aware of this from the onset, they fit a 2.0 with this intake no problems, but, the 2.5 is around 15mm taller than a 2.0, so "clearancing" was required  It "just" touched when test fitting, now, I have about 10mm of clearance  You cannot see where it was done, and so far, there's no contact when giving it the beans Happy days
    • It's been a while since I've updated this thread. The last year (and some) has been very hectic. In the second-half of 2024 I took the R34 on a trip through Germany, Italy, France and Switzerland - it was f*cking great. I got a little annoyed with the attention the car was getting around Europe and really didn't drive it that much. I could barely work on the car since I was living in an inner-city apartment (with underground parking). During the trip, the car lost power steering in France - split hose - and I ended up driving around 4,000kms with no power steering.  There were a few Nurburgring trips here and there, but in total the R34 amassed just shy of 7,000kms on European roads. Long story short, I broke up with the reason I was transferred to Europe for and requested to be moved back to Japan. The E90, loved it. It was a sunk cost of around EUR 10,000 and I sold it to a friend for EUR 1,500 just to get rid of it quickly. Trust me, moving countries f*cking sucks and I could not be bothered to be as methodical as I was the first time around.
    • I assume clearances were all a-okay?
    • Shock tower brace is in +5Kw....LOL  
×
×
  • Create New...