golfdave
Autocross Champion
- Location
- Scotland (U.K.)
- Car(s)
- Mk7 Golf GT Estate
So I was reading this weeks "Autocar" magazine & noticed this little snippet of a conversation about the new Mercedes A-class.
Basically they have reduced the drag down to 0.25cd by flattening the underside of the car. Which had the same effect as removing 100kg from the weight of the car!
Unfortunately I can't find the original cd figures for the previous pre-facelift versions, so have no comparison.
Anyway earlier in this thread I stated:-
""Just a quick update, VW have just launched a new Bluemotion version of the Golf hatch, Estate & SV with the new 1.0lt TSI engine. They have had to fit & I quote "By lowering the chassis by 15 mm, adapting the radiator grille (more solid), optimising the cooling airflow and fitting special underfloor panels and a rear spoiler (side fins), the Golf TSI BlueMotion’s Cd value has been reduced to 0.28 (from 0.29 in the standard Golf). Forum member & owner of the same car confirmed it only has the diesel noise insulation aero tray & NONE of the other trays etc.
Found this site (NSX owners forum) which has aa Audi A4 before & after cd gain for different undertrays etc.
http://www.nsxprime.com/photopost/ns...eneration.html
Looking at it I recon that fitting the my full package I have reduced the drag by at least 0.014.
So standard quoted Cd for the MK7 Golf estate is 0.27 (hatch is 0.29) these figures are from the web so might not be 100% .
So a reduction from 0.27 to 0.256...is a reduction of 5.2% so in theory an increase of fuel range by the same 5.2%. """
So I wonder if VW will be following Mercedes lead & looking at this thread & then realise that they have been stupid & could lower the brands overall emissions based on car sales etc by fitting the bloody aero trim panels it flipping well already makes!!
Basically they have reduced the drag down to 0.25cd by flattening the underside of the car. Which had the same effect as removing 100kg from the weight of the car!
Unfortunately I can't find the original cd figures for the previous pre-facelift versions, so have no comparison.
Anyway earlier in this thread I stated:-
""Just a quick update, VW have just launched a new Bluemotion version of the Golf hatch, Estate & SV with the new 1.0lt TSI engine. They have had to fit & I quote "By lowering the chassis by 15 mm, adapting the radiator grille (more solid), optimising the cooling airflow and fitting special underfloor panels and a rear spoiler (side fins), the Golf TSI BlueMotion’s Cd value has been reduced to 0.28 (from 0.29 in the standard Golf). Forum member & owner of the same car confirmed it only has the diesel noise insulation aero tray & NONE of the other trays etc.
Found this site (NSX owners forum) which has aa Audi A4 before & after cd gain for different undertrays etc.
http://www.nsxprime.com/photopost/ns...eneration.html
Looking at it I recon that fitting the my full package I have reduced the drag by at least 0.014.
So standard quoted Cd for the MK7 Golf estate is 0.27 (hatch is 0.29) these figures are from the web so might not be 100% .
So a reduction from 0.27 to 0.256...is a reduction of 5.2% so in theory an increase of fuel range by the same 5.2%. """
So I wonder if VW will be following Mercedes lead & looking at this thread & then realise that they have been stupid & could lower the brands overall emissions based on car sales etc by fitting the bloody aero trim panels it flipping well already makes!!
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