Thread: Who can tell fuel consumption of TD5 Auto when idling + AC on?

Originally Posted by DiscoMick

Air-con should be set at about 24.

Yeah, true if i was driving through the rain or in a cold night when I need to clear the moisture from the windscreen, but very unlikely during a daytime light in Sydney in a normal summer or so. My normal temp of AC on is always in 17 - 20 range depends on what car it was.

Originally Posted by Pedro_The_Swift

This may or may not help.
do you like nuts?
if not fast forward to the 9 min mark---


YouTube

Can't stop laughing with the video.

BTW, I heard there is an idea from the video saying that a sedan 4.4L petrol running idling at 1.6L/hr.

Just sharing my own stories.

I had a BMW 4.4i X5 Petrol before and when let it running idling + AC on in Sydney summer it was way more than either 1.6L/hr or (1.6+ 10%)/hr, I recalled that the BMW X5 drunk 21L-22L/100kms normal driving around town with AC on all time.

I also had a Prado 3.6L manual petrol and when let it running idling with AC on, I did not think it was something less than 3L/hr too. One time I let the car running idling for 10hrs over a very cold night in TAS with the heater on, I thought it was about 25L-30L less fuel when we wake up. That car was kind of 16L - 17L /100kms around town with AC on all time.

I had another Landcruiser 80s Turbo Diesel 4.2L manual, when letting idling + AC on, I think it should be well more than 3L/hr based on my observation, while driving around town with that fully kitted rig was about 13L-13.5L/100kms AC on all time.

I also had a Landcruiser Kakadu 100s 4.7L Auto and when doing idling + AC on, it is hard to believe it was less than 4L/hr. That car also drunk well about 23L-25L/100kms in normal driving around town.

So I reckon manufacture's number or 10% plus of fuel when AC is on might be a myth or an optimistic number, or it really depends on many different factors.

Overall, these numbers are just for fun facts. Cheers.

Originally Posted by AK83

I had one of the Scanias today(G440), and it sat at 1.7lt/hr while warming it up.
So that's a 12+ lt motor.

Using that as the estimate, one quarter of 1.7lt = about 0.5lt(or thereabouts) .. so I'm guessing 0.5lt /hr.

Oh! ... I didn't have A/C running tho.

A (really!!)weird update.
The Scania I had today, I started from cold.
First start, it showed about 4l/h, and slowly dropped within a couple of mins down to 1.8l/h
Not weird, but then I turned the A/C on, and let it idle again for a few mins.
So with A/C now on, it showed 1.4 - 1.6 lt/h

Turned A/C off again, let it sit for a few secs, and back up to 1.8l/h.
A/C back on, and back to 1.4-1.6 l/h.
It never showed 1.5l/h, just varied between the 1.4 and 1.6 value.

Tacho is analogue, and showed about 500RPM constantly.

the td5 drinks about 500ml/hr just idling through what it takes to make it idle.

your AC is about a 6hp draw when the pump is in and at full load.

a 6hp diesel genny is about 4kva and they run about 2l/hr at full load. your AC duty cycle will be between 30% and 100%. thats about 600ml and 2L/hr

add a fudge for fan load, radio,body electricals.

best guess..

between about 1.2l/hr and 2.5l/hr

Originally Posted by Blknight.aus

....

best guess..

between about 1.2l/hr and 2.5l/hr

I'd reckon that's a bit over, going by what a 12.7lt truck motor(Scania) uses at idle.
granted that the tech involved in the Scania with it's U-bute technologically advanced injectors and ECU programming(Euro 5) is probably a bit more advanced than what an old first gen electronic diesel uses.