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TallPaul
Member Since: 03 Jan 2008
Location: Near Reading
Posts: 1115
  
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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.
Fuel guage ALWAYS lies by 2-3mpg on ours.
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 Fri Mar 11 2011 5:05pm |
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anglefire
Member Since: 09 Mar 2010
Location: In the Club House
Posts: 1082
 
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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 Zermatt Silver. GNVP Sump Guard, RAI, Chrome Side Tubes,GNVP Sliders,Heated seats F&R, Heated screen, 4x4 Sat Nav enabled. ATR's (Thanks Ken)
Trailer called "Tilly"; Caravan called "The Van"
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Disco Picture Website Here
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| Fri Mar 11 2011 8:24pm |
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disco3cb
Member Since: 07 Dec 2008
Location: Alberton
Posts: 72
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I managed to get this cruising around the Kruger National Park at 50 KM/H.
 | | Click image to enlarge | Disco3 TDV6 SE 2006, 4x4 Info Unlock(Baben), Dual Battery System, General Grabber AT2's, Digityre TPMS. Faultmate MVS2. (Double Gearbox Flush-Awesome) 
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| Thu Apr 14 2011 11:04pm |
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anglefire
Member Since: 09 Mar 2010
Location: In the Club House
Posts: 1082
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Nah, it's in Km's - doesn't count as it's not proper measurements  Mark.
2006, D3 SE Auto Zermatt Silver. GNVP Sump Guard, RAI, Chrome Side Tubes,GNVP Sliders,Heated seats F&R, Heated screen, 4x4 Sat Nav enabled. ATR's (Thanks Ken)
Trailer called "Tilly"; Caravan called "The Van"
_________________________________________________
Disco Picture Website Here
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| Thu Apr 14 2011 11:39pm |
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Discoed
Member Since: 16 Jun 2010
Location: Yorkshire
Posts: 425
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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
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| Tue Apr 19 2011 4:49pm |
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VanTheNewMan
Member Since: 15 Mar 2011
Location: Not here
Posts: 206
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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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| Tue Apr 19 2011 6:16pm |
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kk7408
Member Since: 29 Apr 2011
Location: UK
Posts: 11
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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?
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| Sat Apr 30 2011 12:02pm |
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Peter s
Member Since: 18 Jan 2012
Location: Derbys
Posts: 35
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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 
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| Sun Feb 19 2012 8:12pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 4184
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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 
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| Mon Feb 20 2012 12:31am |
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Peter s
Member Since: 18 Jan 2012
Location: Derbys
Posts: 35
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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
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| Mon Feb 20 2012 9:35am |
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