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instarx · 02-03-2009, 03:30 PM

I suspect it won't make much difference aero-wise since the front of the undertray will be behind the air dam in both cases. But from an engineering point of view the yellow line would be better. That way if you hit a curb with the air dam you won't damage the tray. If the tray is attached to the bottom of the air dam it will be damaged whenever the dam flexes. That dam is way out in front, so it will scrape on slopes and curbs I'm sure.

Conventional wisdom is air dam OR under tray, not both. but who am I to say?

02-03-2009, 03:30 PM	#4 (permalink)
instarx EcoModding Dilatant Join Date: Jul 2008 Location: NC Posts: 262 Volvo - '00 Volvo V70 XC AWD SE 90 day: 27.7 mpg (US) Thanks: 4 Thanked 27 Times in 17 Posts	I suspect it won't make much difference aero-wise since the front of the undertray will be behind the air dam in both cases. But from an engineering point of view the yellow line would be better. That way if you hit a curb with the air dam you won't damage the tray. If the tray is attached to the bottom of the air dam it will be damaged whenever the dam flexes. That dam is way out in front, so it will scrape on slopes and curbs I'm sure. Conventional wisdom is air dam OR under tray, not both. but who am I to say? Last edited by instarx; 02-03-2009 at 03:38 PM..