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| D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
20th August 2011, 07:46 PM
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Well I am using cheap diesel from unknown source in cans for A6 and on the run it does 38-40mpg maybe more, locally 33-34 but it is manual unlike A8 , weight I believe is about the same. I would have expected a bit more mpg on 2.5TDI A8 maybe EGR or wastegate is sticking, I do feel like one of them is sticking on mine sometimes, I will do overhaul and most likely blank off EGR and delete function from ECU but I am leaving it for now until cambelt change, it is now at 154k miles and first change was done at 86k so looking to do change @160-170k
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#2
21st August 2011, 08:20 AM
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I'd be keen to improve. Excuse my ignorance - what's an EGR and can we easily live without it and what's the waste gate?
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D2 FL Q 2.8 V6 2002 Taxi(?) spec - no heated seats headlight washers etc. D2 PF Q 2.5 tdi LHD rear blinds and heated rear seats, Bose, 5 speed Tip, Servotronic, Pioneer AVIC 333,333 km Murdered on a P&O ferry 2012. Cat3 write off Last edited by christhompson; 21st August 2011 at 08:22 AM. Reason: add wastegate query
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#3
27th August 2011, 11:16 PM
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Quote:
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#4
28th August 2011, 09:17 AM
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The 2,5 TDI V6 is quite a thirsty engine. I ran a 2003 A4 2.5 TDI quattro for 5 years, and compared to even the 3,0 TDI V6 in my later '07 A6 quattro Avant, it was terrible.
The 2,5 TDI's thirst has been well documented on TDI boards.
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 2006 Audi A8 D3 Quattro Sport 4.2 TDI - Silver, Family Oil Burner. 2000 Audi A4 Quattro Sport 2.5 TDI - Santorin Blue, S8-Powered DTM Race Car Build In Progress. 2000 Audi A4 Quattro Sport 2.8 30V - Pelican Blue, RS4 Widebody, D3 4.2 01E, High-Spec B5 Build In Progress.
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