well the strangest thing seems to have happened!

6704nathan · Mar 3, 2012

having recently bought another range rover dse after a brief fling with a nissan terrano hatefull thing whilst being rather pleased with the new it was never very good on fuel infact trip display would never get above 23.5mpg
so full service air oil fuel and pollen filters gearbox oil and filter plus new cooler, diff oils transfer box etc hoped it would improve but didnt.
now i figured it would never be as good as my first dse averaged minimum of 28mpg but ran a tuning box decat silicone turbo pipes and 20psi boost pressure so consoled myself it would improve after having it chipped and a few other bits and pieces BUT this is where the strange part comes in recently towed i would guess a good couple of tonnes on the back up hill and down dale really worked it hard and got in it for my work commute (first time it has been used since towing duties) and seemed rather more sprightly than before so thought i would reset the mpg trip and it sat steady around 30-31mpg!
massive improvement guess that working it hard and getting it hot must have burned some crap out of somewhere but really rather pleased!!!!

jt_armstrong · Mar 3, 2012

You used to hear similar stories in the past about cars needing a good thrashing once in a while. Never was quite sure why. Might have been an old wives tales.

aerofabrique · Mar 3, 2012

6704nathan said:
.... and it sat steady around 30-31mpg!
massive improvement guess that working it hard and getting it hot must have burned some crap out of somewhere but really rather pleased!!!!

Wait until they make the change to summer diesel later this month from the winter diesel. It should go up another 4 or 5 miles.

egor8384 · Mar 3, 2012

Was self employeed for most of last year and ran a 2 litre diesel transit. Used every day and got around 500 miles to a tank. then we started workin for another contract and used my dads van most of time as bigger than mine was, and when we were working on same site made more sence. But still had over other sites so used meny couple times a week and it dropped to just over 400 miles a tank. So using them more does make a difference.

Bix · Mar 3, 2012

jt_armstrong said:
You used to hear similar stories in the past about cars needing a good thrashing once in a while. Never was quite sure why. Might have been an old wives tales.

In diesels, yes it does. The first thing is they are only fuel efficent when up to temperature, I am running a constant screen over my rad because I cannot push the engine enough to keep it warm on my commute to work. Even now it still drops into the blue quite a lot.
Diesels are also most fuel efficent when you're putting them under load, that is actually carrying a load, towing, going up hill. They aren't made to cruise around town in a high gear.

But also the diesel particulate filter (DPF) gets clogged quite easily (especially when cruising around town in a high gear), so a hard drive will burn all of the crap out. Some garages would recommend replacing the DPF, those garages need shutting down as all they do is take your car for a blast down the motorway in a low gear and charge for a new DPF and fitting. GMs guide lines are 4th gear doing 70mph for 45 minutes to one hour.

And for extra fun, the cat converter takes 15 minutes of 50mph driving to get up to temperature, until then it doesn't work. So the only reason it was fitted, reduce emissions around town, becomes mooted. So thank the Yanks for that life saving piece of technology.

wammers · Mar 3, 2012

Bix said:
In diesels, yes it does. The first thing is they are only fuel efficent when up to temperature, I am running a constant screen over my rad because I cannot push the engine enough to keep it warm on my commute to work. Even now it still drops into the blue quite a lot.
Diesels are also most fuel efficent when you're putting them under load, that is actually carrying a load, towing, going up hill. They aren't made to cruise around town in a high gear.

But also the diesel particulate filter (DPF) gets clogged quite easily (especially when cruising around town in a high gear), so a hard drive will burn all of the crap out. Some garages would recommend replacing the DPF, those garages need shutting down as all they do is take your car for a blast down the motorway in a low gear and charge for a new DPF and fitting. GMs guide lines are 4th gear doing 70mph for 45 minutes to one hour.

And for extra fun, the cat converter takes 15 minutes of 50mph driving to get up to temperature, until then it doesn't work. So the only reason it was fitted, reduce emissions around town, becomes mooted. So thank the Yanks for that life saving piece of technology.

Correct, a cat on a diesel is as useful as tits on a Mars bar.

6704nathan · Mar 3, 2012

some of the hills i had my foot down nearly all the way and was pulling about 25-30mph so it really had to work hard!
its just the difference it has made to performance and mpg really amazed me!
so when the new chip i have ordered arrives and i get round to soldering it into the ecu should be interesting to see how much difference that makes!

Datatek · Mar 3, 2012

Bix said:
In diesels, yes it does. The first thing is they are only fuel efficent when up to temperature, I am running a constant screen over my rad because I cannot push the engine enough to keep it warm on my commute to work. Even now it still drops into the blue quite a lot.
Diesels are also most fuel efficent when you're putting them under load, that is actually carrying a load, towing, going up hill. They aren't made to cruise around town in a high gear.

.

If yours runs in the blue, either the thermostat is fubarred or the viscous coupling on the fan has seized.

well the strangest thing seems to have happened!

6704nathan

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jt_armstrong

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aerofabrique

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egor8384

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Bix

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wammers

No longer with us, RIP

6704nathan

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Datatek

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