Panorama VW last night

Slam62 said:
It's not about economy,
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The discussion has moved on to the validity of the EU NEDC testing process, part of which is about the derivation of fuel consumption figures.

I'm sure all participants of the discussion are aware that the 'defeat device' and the findings of the television show relate to NOx.
 
SDK^ said:
The point of the EU test is that each car is tested in exactly the same conditions so you can compare the fuel economy of car 'a' to the economy of car b, c, d etc...
No where does it ever mention that customers should achieve the same mpg numbers. The manufacturer literature actually says you won't get the stated economy.

If the test was carried out on the road then it would introduce a whole number of uncontrolled variables.


:)
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Bit like the Dyson thing recently

EU has great Love for tests as long as they are "Reproducible" (whether or not they have any actual practical relevance in the real world is however of no consequence!)

:/
 
[TW]Fox;28859670 said:
This is the excuse that is trotted out, but it's simply that - an excuse. Being able to compare one completely meaningless number with another doesn't change the fact both numbers are meaningless. Just because Car A is 10% more efficient on the test than Car B doesn't mean it's 10% more efficient on the road, so it's dubious whether it even provides a figure you can use for comparison purposes.

How's your 48mpg Golf doing?

The excuse gets less and less tolerable as the figures climb ever higher. The current BMW 320d apparently acheives over 80mpg in the Extra Urban test. 80mpg! A completely pointless and meaningless figure. As I said, the same car in the USA gets 45 US MPG highway. Far more reasonable and realistic..

The US EPA seem to manage to have a test that provides meaningful and repeatable numbers. I often use them to judge the fuel efficiency I might achieve and have always found them to be bang on..
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remember the US gallon can't compare with the UK gallon as they are different measurements. 45 MPG in the US equates to 54 MPG here. Still not 80 though so I take your point. Couldn't miss a chance to out pedant fox ;)
 
Fr0dders said:
remember the US gallon can't compare with the UK gallon as they are different measurements.
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Which is why I quoted the figures as 'US MPG' not 'MPG'.

Why would you think I needed to be reminded the gallon was a different size when I'd specifically quoted US MPG as the unit of measurement? ;)

Couldn't miss a chance to out pedant fox ;)
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Denied ;)
 
[TW]Fox;28859724 said:
The discussion has moved on to the validity of the EU NEDC testing process, part of which is about the derivation of fuel consumption figures.

I'm sure all participants of the discussion are aware that the 'defeat device' and the findings of the television show relate to NOx.
Click to expand...

Yes but the thread is about the panorama program and the defeat code, not fuel economy.

The fuel economy is only relevant if ,should they make the engines compliant the fuel economy changes and then they introduce a defeat device for that. But who's to say they haven't anyway.

In fact it seems highly likely.
 
Seems VW are fixing some of the EU engines adding a 'flow seperator'... I guess also conveniently with software updates. Im guessing the increases MAF measurement will give tighter control over the EGR duty and control which is key to them reducing the NOx.
 
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