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Old 01-09-2010, 03:09 PM   #11 (permalink)
aerohead
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Coastdown numbers for crx

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Originally Posted by aerohead View Post
3-Wheeler,just catching your post.My CRX data are at home,I will try to remember for tomorrow.I'm trusting my memory less and less now so rather than shoot off my mouth with nonsense I'll get the written materials together for you.Catch you then.
3-Wheeler,these are the values that CAR and DRIVER's computer came up with for the coastdown tests at Chrysler.I was not given the raw data set from the 5th-wheel.
The report I got broke the numbers down into road horsepower at three different velocities.
Test conditions at Chrysler were 49-DBF,42-WBF,29.15"Hg baro.,Calm.

velocity,MPH HP ( friction and tires ) HP (aero ) Road-HP
30 1.76 1.21 2.97
50 2.94 5.61 8.55
70 4.12 15.38 19.50
BSFC @ 70----------------------------------- 0.3988 LB/HP-HR
The CRX test weight was 1,926-lbs + 183 for Don and his equipment.
Tire pressure was 35-psi all around.
Coastdown included the aero drag of the optical 5th-wheel,as it was mounted to the passenger door.To date,I've never received info on the drag contribution of the 5th-wheel.I've estimated it's composite frontal area and composite Cd and will address that in a separate thread.

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