Diesel used at idle with Aircon on

[dgrev]

Yesterday it was pretty hot here and when I was picking my daughter up from school I said to my son, "lets get out and stand in the shade". He said "why not sit here with the airconditioning on". To which I replied "that uses lots of diesel".
However, I have just been reading up on modern diesel technology and according to what I was reading, force fed common rail engines use down to 145:1 fuel ratio at idle! So unlike a petrol engine, ours should be pretty frugal.
So when my son and I hopped out of the car, we were surrounded by other parents all sitting in their cars with the windows up and the engines running.

I can't help it if I was raised by frugal depression era parents, in grained habits......

So, can anyone tell me what the diesel burn rate is for the scenario above of a Pajero?

Thanks
Doug

[geopaj]

Hi,

I think you'll find m_and_m's research interesting...

http://www2.pajeroclub.com.au/forum/showthread.php?t=44932

[KiwiNTPajero]

diesels are very efficient at ldle ,much more so than petrol.They still use fuel of course so your choice was valid.

[bacon]

Do you drive around on a stinking hot day with AC off and windows down ??You use AC cooling while you are driving so you are comfortable so why not sit in comfort ? So what if it used a $1 of fuel you could save even more if you walked to pick you daughter up

[Jeffwatkins]

I can't help it if I was raised by frugal depression era parents, in grained habits......

In that case you should have walked to the school.

[erad]

You have about 140 kW of power (maximum). The vehicle requires probably 25 kW of power to run it at 80 km/h. The A/c uses maybe 2 or 3 kW maximum, so the amount of fuel required to run it would be minimal. My bigger concern would be what is going out the exhaust and where it is going.

[dgrev]

Hi,

I think you'll find m_and_m's research interesting...
http://www2.pajeroclub.com.au/forum/...ad.php?t=44932

Geopaj

EXCELLENT, thanks for the link.

So, it would appear anywhere from 450ml per hour no load to 950ml
per hour with A/C on.

Good info for future reference and just plain curiosity.

Therefore, on 45°C days in Broken Hill, I will be running a 2.3 Tonne reverse cycle A/C whilst waiting at the school.
So roughly 45c per 1/4 hour per day when it is really stinking hot at current prices.

Regards
Doug

[nifty]

Geopaj



Therefore, on 45°C days in Broken Hill, I will be running a 2.3 Tonne reverse cycle A/C whilst waiting at the school

whilst sitting in a comfortable lounge suite listening to a good sound system away from the glare, and flies,through tinted windows. ( sounds even cheaper now with all those benefits )

[erad]

Diesel fuel has a calorific value of 36.9 MJ/Litre. Using 0.5 L/hour extra to run the A/C means that the fuel input is 18.5 MJ/h, or equivalent to about 5.1 kW. A diesel engine has about 40% maximum efficiency, so this means about 2 kW is absorbed by the A/C system. This would be about the right order of things.

[dgrev]

whilst sitting in a comfortable lounge suite listening to a good sound system away from the glare, and flies,through tinted windows. ( sounds even cheaper now with all those benefits )

Droll! You know how to state a persuasive case.

Regards
Doug

[dgrev]

Android Torque app setting for instantaneous fuel usage?

I tired setting up an instantaneous fuel/min gauge on the Torque app on my Android phone, but it doesn't work. Does anyone know the settings that I need to get a response please?

Regards
Doug

[Mike DiD]

Had no problem setting up Litres/Hr using Torque Pro on my NX.

It uses 1 L/hr at idle - haven't checked how much difference Aircon makes.

Driving at 100km/h uses 10L/hr.

[dgrev]

Mike

For some reason, Torque has always been a fight on my Samsung phone. Like
others, I wasn't having much success with it until some very knowledgable member of this forum gave us the exact settings. Who that was, I now have no idea as it was quite some time back.

I was hoping that he or someone else who knows their way around that app would be reading this thread!

Can you tell me exactly what you did?

Regards
Doug

[cookie9]

I thought if you did EGR resistor mod it throws out all the fuel use telemetry and range estimates?

[dgrev]

I thought if you did EGR resistor mod it throws out all the fuel use telemetry and range estimates?

Mate,

I have no idea what you are talking about.

What is an EGR resistor and why would it be modified?

Regards
Doug