Quote:
Originally Posted by aerohead
* the Chevy Spark ICE is Cd 0.36. BEV variant is Cd 0.325.
* the FIAT 500 Lounge ICE is Cd 0.359. BEV variant is Cd 0.311.
* the Hyundai KONA ICE is Cd 0.32. BEV variant is Cd 0.29.
* the 2007 Ford Fusion ICE is Cd 0.34. 100% grille-block = Cd0.316.
* the 2016 VW Golf ICE is Cd 0.287. BEV variant is Cd 0.27.
* the KIA Niro ICE is Cd 0.35. BEV variant is Cd 0.35.
* the Spirit of EcoModder, 2014 is Cd 0.2675. With 100% grille-block, Cd 0.2405.
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1) if we're going to talk about cooling drag, how about establishing fixed parameters under which the quanta will be observed and reported.
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The parameters are cooling drag as either a proportion/percentage of aerodynamic drag or Cd change. This is ignoring other changes that may occur as a result of becoming an EV.
Comparing ICE and EV variants doesn't help, because it is more than just the cooling that has changed, the gearbox is different, they may use narrower tyres, different rims, there is no fuel tank or exhaust, the battery pack may form an undertray where previously there wasn't one etc.
There is no need to "fix" anything, aerodynamic drag is proportional to speed squared, that is why we have Cd