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Old 08-11-2009, 06:53 AM   #43 (permalink)
aero guerrilla
Piwoslaw's Avatar
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,538

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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Coastdown results

I went through the coastdown data and got some numbers. Since it turned out that the test track is sloped, I decided to process the 'E' and 'W' runs independently. I used the spreadsheet you can get from to find the Cd and Crr coefficients. I modified the spreadsheet for 5 second intervals instead of 10sec.
No mods:

With mods:

In the 'W' runs it appears that Cd increased, but when including all runs it dropped from 0.334 to 0.324. That's not much The roof rails and mirror did change frontal area, though. I guess you can't really change much in a 1.5 ton cow with the FA of a barn. Maybe I'll find a better, flatter road with less traffic somewhere around here and repeat the tests.

Yesterday evening the Wife was looking at used VW Lupos, the 3L versions. I looked over her shoulder and got jealous. Those things are so small, and weigh only half as much as Svietlana. Well, we both know that there's no reason to have two cars when we don't use the one we have too often.
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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