Member Since: 03 Jan 2008
Location: Near Reading
Posts: 1214
mees wrote:
Hi,
when the EGR valves are blanked, will this improve fuel consumption or will it get worse. that is not clear to me, some say there is an improvement and some say it is getting worse
I say worse.
The Exhaust Gas Recirculation (EGR) valve is there to send exhaust gas back into the engine on overrun. So when you lift of the throttle (say downhill) rather than putting in air/fuel mix into the cylinders to burn it pumps through exhuast gas as part of the compression cycle instead. Why burn fuel when you don't need to generate energy.
So if you blank then, the engine always has to pump through fuel, hence more consumption in theory, of course driving style and road types will have a bigger impact overall.
This is why when they fail and stick open you get no power, as when you try to accelerate instead of combustible oxygen you have exhaust gas in the cylinder as well.
On topic of consumption, our manaul does ~27-28 during fill ups but thats mostly due to short trips and wife's right foot, can get 29 on longer runs.
I wouldn't expect any fuel to be used on the overrun TBH on modern engines. The electronics should shut it off - unlike the old mechanical pumps that would keep fuelling.
I understood the EGR's worked at low revs and power to recirculate the nasty stuff, possibly overrun too.Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
_________________________________________________
Disco Picture Website Here
11th Mar 2011 7:24 pm
disco3cb
Member Since: 07 Dec 2008
Location: Alberton
Posts: 75
I managed to get this cruising around the Kruger National Park at 50 KM/H.
Nah, it's in Km's - doesn't count as it's not proper measurements Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
_________________________________________________
Disco Picture Website Here
14th Apr 2011 10:39 pm
Discoed
Member Since: 16 Jun 2010
Location: Yorkshire
Posts: 1020
Just some actuals from my D3 manual 05
Blanked EGR and fast road intercooler but no re-map
mixed motorway and A roads over 233 miles - 28.9 mpg
Local big hills and short trips over 64 miles around the pennines 22.5 mpg
Seems OK to me
19th Apr 2011 3:49 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
Member Since: 15 Mar 2011
Location: Not here
Posts: 206
I read the quotes re Torque etc?
I know I'm thick, maybe!, but what do you mean by use the Torque?
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Use the torque and the gear stick... better fuel, hustles along VERY nicely and also much less stressful too.
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19th Apr 2011 5:16 pm
kk7408
Member Since: 29 Apr 2011
Location: Lancashire
Posts: 61
You could also consider adding an LPG tank to your diesels, that should give more mpg/power. Done it to Disco 1, and the difference is distinct. Manage to get an extra 5 mpg out of it.
Don't know if anyone has tried on a D3?
30th Apr 2011 11:02 am
Peter s
Member Since: 18 Jan 2012
Location: Derbys
Posts: 36
As a new owner (6-8 weeks) I was a little disappointed with a return of 21.8 average. Mainly on 6-14 mile runs and lots of hills and I naturally worried about the egr issue. Today we went on our first run across country to the m1, when we got to Chesterfield it stood at 40 mpg, great. She then hammered it up a dual carriageway and the m1 (80-90 mph), coming home she slowed a bit then hammered it again and we returned with an average of 28.1. At times we were well in the 30's so I am happier than I have been. The overall journey was 60 miles.
Things are looking up.......I think
19th Feb 2012 7:12 pm
character
Member Since: 31 Dec 2007
Location: wiltshire
Posts: 5781
recon you didnt set the mpg and the odmeter to both to zero at the same time when stationery as 40 mpg would be widely out.
BTW the D3 uses the average figures over a period of driving weeks/months so the only way to do it with any certainty would be fill up when the empty lights on, write down the mileage with you fill up and then when you refill
19th Feb 2012 11:31 pm
Peter s
Member Since: 18 Jan 2012
Location: Derbys
Posts: 36
Hi we reset the av mpg setting but not the odometer when we were doing approx 20 mph (forgot when we set off). The first part of the journey was slow a roads Inc a downhill part. It looked like it was working okmas the heavier her right foot the lower the average figure went,
I will do the fill up thing but it when I get chance. I would have liked to got 30 plus average but overall was happy with the figure.
Thanks for your response
Pete
20th Feb 2012 8:35 am
Sheepgnome
Member Since: 21 Mar 2012
Location: Caldicot
Posts: 1
55 Plate - HSE Auto -
Averages 23 - 29 mpg - dependant on whether it is my foot or the leaded foot of the wife
Not towing and on long steady run will get up to 30-32 mpg dependant on road type and terrain (M5 heading down towards Exeter returns 32 mpg at 60 MPH - really trying)
Towing 6 berth tintent returns 20 - 25 mpg - use autobox to 50 MPH then select command cruise and put it in 6th for best return on mpg, be aware box drops to 5th at 50 MPH no matter what the terrain.
Otherwise average is 23 - 25 - not bad for something as aerodynamic as a concrete block and weighing what it does...
Home is where your head may leave but not all of your heart...
11th Jul 2012 5:09 pm
longblackcoat
Member Since: 22 Jun 2011
Location: UK
Posts: 75
On a recent 4000 mile road trip round France, with 3000m of 75mph motorway cruising and 1000m of Alpine passes and countryish roads, I averaged 30.9mpg. That's real, not from the on-board display (though it showed 31.5, so can be taken as pretty much accurate).
30th Aug 2012 11:25 am
Mr Kington
Member Since: 12 Dec 2011
Location: Scottish Borders
Posts: 1552
I have a 2005 HSE auto and just did 1000 miles from the Uk down to France and back. Way out got 30mpg on the motorway sat at 80 mph.
When i got home we had dropped back to 26.9 mpg which i think is fine. Significantly up since we had the belts and the service done.
30th Aug 2012 3:32 pm
conman69
Member Since: 11 Aug 2012
Location: Norfolk
Posts: 431
MY07 GS
Brim to brim 500miles = 27.7mpg, Trip meter recorded 30mpg
This included a 320 mile round trip to Legoland, Windsor Castle with motorway driving a steady 70mph Discovery3 TDV6 GS
Disco3.co.uk front orange +white tailgate stickers
Belts, pulleys, oil pump replaced, double tow-bar electrics
Land Rover rubber mats throughout, tinted windows, wind deflectors, smoked side repeaters, retro fitted Garmin, smooth leather steering wheel, cruise control + radio switches, 19" HSE wheels, Bearmech side-tubes, BAS IFBH module, roofbars.
LML Star Deluxe
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