LPG V Petrol performance figures

Mainey,

Oops, should have been 6.9 on ULP.

When I find time with the camper on the back I'll do the numbers again. It's bloody hard slowing to 60 on a Melbourne Freeway without upsetting people LOL.

I went for the 60 to 100 in third as 60 in third is quite low in the rev range and it was a torque exercise, as even at 100 in third it still hadn't hit the peak kW output.

Jim.

Imagine that being fuel sufficient for the next 100 years (if we wernt flogging it all off to china. Would need a fair bit of infrastucture pluss a few hurdles but the benifits would be immense

Yeah well thats nothing!!!!!

I started this test on the way to work this morning in the POWER HOUSE 2.8 Patrol........and I'll let you know the results when it gets to a 100.....LOL

Cheers Stefan

Jim,

Good to see that you are still keen on LPG perfection. Most people don't get that once LPG is setup properly, it can return savings of more than 35% irrespective of how hard you drive and how loaded your vehicle is.


Even with seq injection, LPG is still sluggish under 2500rpm.

LPG fuel consumption will always be a bit higher than ULP - this comes down to the octane ratings.

LPG, if setup properly and tuned properly can and will produce more power than ULP.

Different brands of LPG will give you different consumption and power figures. For us, Shell LPG seems to be the best brand for our AU Falcon. My WB V8 ute is less fussy and doesn't seem to care what brand is runs on, as it's consumption and power is almost constant on every brand.

CNG is just Natural Gas. LPG vehicles can easily be modified to run CNG. The cost per litre is really cheap, but your consumption is very high compared to other fuels including LPG. I researched this a few years ago, 100ltrs of CNG will get you around 200kms. This is a Metro only fuel solution due to this limited range per tank.

LPG starts its life as CNG, then its refined further to produce the final product. Both LPG & CNG are by products on oil refining.

So before I get roasted over this let me say that, each fuel has its place. I use LPG for my city and highway vehicles as this tends to be the highest area of my running costs, and ULP only in my Cruiser for offroad - I didn't get a diesel Crusier due to vehicle cost and the fact that diesel still can't give you instant power which I prefer as we do alot of high country/mountain driving. I know my consumption is higher than diesels, but that is my choice and I am happy to pay for it at the pump.

Hi all,
You can get dual mapped aftermarket chips for all petrol/gas vehicles so that they run at the optimum on both.
Dave

My 80 series cruiser averaged 16L/100 easy fwy/city driving. I recently had electronic gas injection fitted and it now uses 20L/100kms with similar driving. So you are right, it does use more (not much though!) but with gas costing 62c instead of $1.59, it now litterally costs half to drive if not less than half. Absolutely massive saving with no power loss.
Also get more range too since i never got 400kms out of my sub tank which it replaced!
Extra time spent pumping the gas gives me enough time to clean the windscreen before it auto shut-offs. Best thing i ever did for a truck which spends 80% of its life on the blacktop.
Especially since it still has more power and more torque than a TD, and is cheaper to run. (waiting bites ha ha).
Just my 2c!

I have a look at numbers and find out that petrol contains about 1.2 more energy per volume compared to LPG (I thought that it much bigger difference). So theoretically speaking in ideal situation car that consume 16L of petrol should consume 19.2L of LPG to perform similar. Thus your numbers looks to me very right. Therefore my previous statement about “much more” not that related to proper installation, but rather to simplified one where gas injected into inlet manifold.

Cheers
Serg

But when we are talking over such small differences, the difference can be how you use your right foot.... Power is similar and economy is about the same, so its pretty much comparing price at the pump as to the savings as i mentioned, give or take.
Still, i'd have a multivalve TD anyday for the range and fuel availability in remote locations...