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Old 11-02-2009, 11:58 AM   #1 (permalink)
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UK version of VW Polo gets lower MPG due to different exhaust routing

Found this interesting tidbit:



Quote:
Right-hand-drive Volkswagen Polo diesels will have slightly worse fuel economy and higher CO2 emissions than the left-hand-drive versions sold in mainland Europe.

This is because the oxidation catalyst and diesel particulate filter in the exhaust system have been moved... [to permit the switch to right-hand drive].
The figures given for the 1.2 L diesel are:
  • 90g/km of CO2 for right-hand-drive in UK
  • 87g/km of CO2 for left-hand drive elsewhere
(CO2 is proportional to fuel consumption.)

I wonder just how convoluted the UK exhaust routing had to get to have a measurable effect on fuel economy?

Source: http://www.whatcar.com/car-news/vw-p...iciency/244512

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Old 11-02-2009, 12:14 PM   #2 (permalink)
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Pictures would have been so nice.
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Old 11-02-2009, 12:38 PM   #3 (permalink)
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Diesels are very susceptible to changes in back pressure.
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Old 11-02-2009, 03:53 PM   #4 (permalink)
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...didn't know that diesels could get "constipated"

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Old 11-02-2009, 04:32 PM   #5 (permalink)
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OK this is my WAG but I suspect "backpressure" is not really a factor; they are talking emissions which include cold start and thus the distance from cat and filter to engine is critical for their heating-up phase.

I suppose if it was more involved that merely shuffling the cat and filter around i.e. if they made them different and less free-flowing that could explain it too.

It would be good to know if these measurements and differences are due to cold start or steady state.

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