Thread: Fuel Consumption

Originally Posted by PhilipA

The engine is a 3.9 running 14CUX but with new style Bosch 4 hole injectors.
Vacuum advance is controlled by the unichip to give a rudimentary electroic control..
Cam is standard 3.9.

I feel a lot of the gain is from
1 throttle openings less due to Thor long runners giving better charge at lower revs so that the injection is at a leaner position on the curve.
2 less changing down by auto on long hills.
3 Unichip providing much more advance at small throttle openings.

I still think I can get a lot more from the engine so next step is to map the
mixtures with a wide band O2 sensor.
4.6 using gems or motronic constantly try for 14.9 stoicometric fuel air ratio at cruise and advance to knock then back off, so they are very difficult to improve.
Regards Philip A

...Yeah I know the GEMS are good but not really very end user adjustable / easily playable/fiddleable with..

Speaking of stoichiometric ratios, does anyone recall the old Chrysler Electronic Lean Burn systems?.....they used to run all over the shop - but with figures sometimes down to as lean as 17-18:1.....it was really hard on all the H.T. leads and rubber cos of the very hig temps but gave good! fuel consumption from their 360, 340, 318 V8's and I think they may have adapted them for use in Aussie straight six "Hemis"

Fuel consumption for 12 months running Serie11 TD5 2003 Model,
10.12Lts per 100k that is about 85% around town with work the rest off road and towing a camper Trailer. Fairly good I recone compered to a mate that has a P***o Deisel and the best he can get is around 16lt - 100k.

My figures are very accurate as every Kilometre and every ltr is logged for work.

Bigmac
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Series 11 TD5 2003 Disco

I got 14.81L/100kms on my Sydney to Brisbane trip. That is with roof racks, minimal air con and sitting on 100-120km/h on cruise control.

Manual 3.9 V8 Disco with some sort of John Davis chip.

I've filled it 3 times since Thursday though.

I get 6l/100km at highway cruising speed, about 9 around town and a bit under 10 towing a car trailer with a series 1 on the trailer - but the series 1 did have the windscreen folded down.

On average my 2003 Disco v8 is drinking 15litres/100km. Does go up when sports mode button is on and planting the foot at traffic lights on the Gold Coast