Thread: Real World D4 fuel consumption

Originally Posted by Weird Al

I have a 2.7 D4 and it gets about 10.5L/100 (actual not optimistic trip computer) around town, and the best I have done on the highway is 8.5, which was Canberra to Syd and return, sitting on about 110-ish. Towing an Ultimate Camper trailer in the hills it gets into the 13's.

Its interesting how regardless of road speed, the D4 always wants to sit at 1900rpm, I guess to keep it near peak torque and make the car more responsive.

This means at 80kmh its stays in 5th, but if you drive up to 100 it will change to 6th and stay there even if you slow down to 80 again. Or if you manually shift it to 6th then go back to auto its happy to stay in 6th and do 1300rpm.

Our 2.7l D4 won't do anything under 1600rpm in 4th, 5th or 6th.

Baz.

Originally Posted by ~Rich~

Jeeze you Dad does not do too much driving!

I know Bloody terrible seeing the vehicle just sit there (and knowing I put 3000km on it)

But he lives on the edge of a Golf Course, is retired, and plays a lot of golf...
His Golf buggy has more Kms on it (just opens gate and drives beside the 18th fairway to the club house)

In fact, they retired and purchased 2 brand new vehicles - neither has many km on it...

Originally Posted by Tombie

I know Bloody terrible seeing the vehicle just sit there (and knowing I put 3000km on it)

But he lives on the edge of a Golf Course, is retired, and plays a lot of golf...
His Golf buggy has more Kms on it (just opens gate and drives beside the 18th fairway to the club house)

In fact, they retired and purchased 2 brand new vehicles - neither has many km on it...

I can see a project in the near future coming on

Originally Posted by Graeme

The D4 has different parameters in the CCF for each of real speed, odometer, speedometer and CC. Real speed uses the tyre size (not necessarily exact due to nominal diameter only), odometer uses the tyre dynamic rolling radius (can be exact), the speedo has 2 "market" options of the real speed 3.5%+2kph or 0%+2kph with the ex-factory setting being 3.5%+2kph and CC uses a nominated% with a nominated kph (set the same as the speedo market).

BTW the speedo reads faster not slower than actual, as per your example.

Graeme.

Ha I hate this sort of thing....it would be so much easier to explain verbally with many hand gestures.

Perhaps it was the bad spelling, but in my example the speedo does read faster,

"That is when you spoeedo says 100kmh you are doing 95"

Oh yes and pardon my ignorance but whats a CCF and a CC (cruise control?)


TerryO

No what I meant was....in standard form with standard tyres in my D4 when travelling for an hour at an indicated 100kmh.

The speedometer will be reading low and I will actually be travelling at a speed closer to 95kmh but the odometer will be correct and I will have covered 100km.

In the A.C.T. they have odometer marker posts on the side of the highway for 5km, when I drive past and set the tip to zero at the zero mark, by the time I get to the 5km mark my trip meter is out by less than 20m. So 20m out of 5000m is 0.4%, much more accurate than the speedometer which says 100kmh when my GPS says 95kmh.

So if I were to change to larger tyres the speedo would become more accurate but in turn the odo would read less, as I don't know that it can auto correct for that sort of thing. What I mean is just an intentional offset between the odo and speedo from the factory. Clear as mud eh...

Redback

"Our 2.7l D4 won't do anything under 1600rpm in 4th, 5th or 6th."

You're a little harsh on the old D4. Now having started my driving career in V8's im used to plenty of grunt from 1000rpm, I will admit that even for a diesel the 2.7 does not have much 'grunt' bellow 1600rpm. However whilst no rocket ship my D4 seems happy enough to motor along most arterial roads at 80kmh at 1350rpm without labouring.

But yes much below that it "won't do anything."

CCF is the Car Configuration File where all sorts of parameters about the vehicle are stored. Some parameters are for information only but others are used to drive various functions, such as the ABS ecu calculating speed from tyre size. Yes, CC indicating cruise control.

My 3.0 growls loudly when made to work at very low revs.

Thanks Guys,

My only last question around the real world consumption of the 3.0L D4 would be is there a reflash or tune upgrade that is available in the market?

Originally Posted by JayBee75

Thanks Guys,

My only last question around the real world consumption of the 3.0L D4 would be is there a reflash or tune upgrade that is available in the market?

Sort of. There are a couple of tuners who can reflash the ECM, but it requires removal of the ECM as it has to be done on the test-bench. That means sending it off to Brisbane or wherever the tuner's test rig is located (DMS is in Brisbane).

The alternative is an interceptor box (a "chip") - not as versatile as a reflash, but they're cheaper and there are some fairly decent ones available.

Cheers,

Gordon

I've just come across to Sydney from Adelaide while towing a 2 horse angle load and loaded to the hilt with stuff for the Sydney Royal. Coming across the Hay plains I ended up having the dash tell me that I was getting 18lt. So here are my two questions. Is this what some people with big vans and other large floats are getting or are they getting better? and secondly, is there someone in Sydney near Blacktown that I can have my ecu hooked up to run a quick check before i head back across the plains? Cheers in advance.