Thread: First fuel economy with 14CUX O2 sensors

Mine's about the same consumption on LPG, it's going to be heavier than petrol.
I'll be looking to fit oxy semsors to mine as well to improve my overall range.

BTW I also think in K/L and find the 'new speak' frustrating.
I have a known quantity of fuel and I need to know how far it will take me, in that regard the old fashioned formula makes more sense.

Originally Posted by 100I

BTW I also think in K/L and find the 'new speak' frustrating.
I have a known quantity of fuel and I need to know how far it will take me, in that regard the old fashioned formula makes more sense.

I used to think that but...

I want to go 500 km and I use 20 litres/100km.

It's just as easy to divide 500km/100 (= 5) then use that to multiply the 20 litres to get the total fuel required.

It's only because you are/were used to miles per gallon.

Originally Posted by p38arover

I used to think that but...

I want to go 500 km and I use 20 litres/100km.

It's just as easy to divide 500km/100 (= 5) then use that to multiply the 20 litres to get the total fuel required.

It's only because you are/were used to miles per gallon.

at the risk of hijacking poor old Phil here, yes the math is much the same either way, the difference is road maps aren't marked in neat lots of 100km the fuel capacity of my tank is however constant, therefore it's easier math the old fashioned way.

Well, if you don't use the approved metric measure , you will find lots of people (young etc) will not understand. Just as if you said pints per mile, I would not easily understand.
Its taken me a Loooong time to get my head around L per100Km, so please use it.
My BMW readout and every other car readout is in Lper 100Km.

Hi Philip, On LPG I'm getting approx 300k's to a 70 liters so that wortks out to be about 4.28k's/ltr or about 23k's per 100k's right?

Are you saying that this sort of mileage is bad as I've never known anything different except the odd 5k's/ltr.

Well LPG gets about 20% worse than petrol , so if that is on the highway yes its bad eg a RRC 3.9 gets about 15= about 18 on LPG.
Regards Philip A

Originally Posted by Frontier1

Obviously I meant 23ltrs per 100k's ( and why does everyone always work on a liter rate per hunder rather than just k's per ltr?).

Pete

L/100kms is a measure of fuel CONSUMPTION (ie volume of fuel consumed per distance travelled).

kms/L (& mpg) is a measure of fuel ECONOMY (ie distance travelled per given volume of fuel).

I know that mpg used to used when talking about about fuel CONSUMPTION, but the pedants (Ron? ) decided it was incorrect & should be corrected.

I know that mpg used to used when talking about about fuel CONSUMPTION, but the pedants (Ron? ) decided it was incorrect & should be corrected.[/QUOTE]

Well yeah as you say, I was talking about economy but I guess courses for horses. Anyway they'll be the first against the wall when the revolution breaks out right?!

I guess it's just what you grow up with, I was always riding Harleys and believe me you always wanted to know how far you got to a tank so that you could work out whether you made it to the next servo' or not on runs!

Pete'

The other thing I think might be playing a role in my fuel economy is that when I installed the lpg, I had to shorted the air-intake funnel to make room. I am wondering now whether the air is coming in too hot since it is probably drawing it from the engine bay rather than from the vents near the headlights.

I have a trip next Thursday to Melbourne from here on the Central Coast so about 1000k's each way. It will be a good trip to test out the new EL radiator I installed, so I might try too to add some additional tubing to the air intake and get it closer to some cooler air.

Hopefully I'll end up with a good ltr to 100k ratio. If not, then I'll look into these O2 sensors. What do they cost and where do I get them from?

Hey Philip, check your PM box too.

Cheers,
Pete'

Pete, what type of gas system do you have? vapour injection by injectors , or old single point vacuum system?
The O2 sensors only work with the ECU so they would only work with vapour injection which used the 14CUX ECU.
AFAIK the vapour injection systems mostly have their own ECU and own O2 sensor.
At 23L per 100Kms, you would most probably have a vacuum system running rich, so O2 sensors will not help.
Regards Philip A.