How do I calculate CdA and RR using Metric data

labr_dk
Posts: 9
Joined: Sat Apr 14, 2007 11:32 am

How do I calculate CdA and RR using Metric data

Postby labr_dk » Sun Apr 15, 2007 2:01 pm

I just bought the AP22, and has installed it today.

However I am having problems calculating the correct factors for CdA and RR since the formula's in the installations guide is only usable for mph measurements.
If I translate, I would have to let my car roll from 96.5->88,6 kmh
and from 24,1->16,1 kmh.
Those numbers are pretty hard to read :-)

Thanks for any insight.
Lars
Ps. Does anyone have "accurate" calculated values for a Saab 9-5 aero (from year 2000) ?

RTUSA
Site Admin
Posts: 457
Joined: Fri Feb 24, 2006 7:34 pm
Location: Richmond, VA, USA

Postby RTUSA » Thu Apr 19, 2007 4:13 pm

The power measurements are not terribly sensitive to small variations in those coefficients, especially for testing at low to moderate speeds.

There are several sites on the Internet that list these types of parameters, of course most are to attributed to known sources.

For getting the measurements yourself, why don't you use the AP22 in time/speed mode? Or you can 97>89 and 24 > 16 on the speedo, those would be close enough.

Hope that helps,
Al Seim
Race Technology USA


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