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aerohead · 08-11-2010, 06:24 PM

WS,I compared your Matrix to the blue template line ( thanks Chaz! ) and it looks like your car has about 24% of the template aft-body.
At this length, with a comprehensive cleanup ( take a look at AeroCivic ) you might get the Matrix to Cd 0.28 at its present length.This number is based on a factory Cd of 0.34.I'm not sure about it but it's not that important.
If you extended the car to 30% aft-body you'd have a shot at Cd 0.25 and 12.5% better HWY mpg.

40%-Cd 0.20 and 20% mpg
50%-Cd 0.17 and 24% mpg
These numbers will give you a feel for what's doable.
If you decide that you will forever limit the cars length we can probably cheat a bit.
If your reserving the option to do later further elongation of the tail,you might want to stick close to the 'template' curvature as it is 'clean' all the way down to the tip and can be used on a 'modular' basis.

08-11-2010, 06:24 PM	#16 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,314 Thanks: 24,440 Thanked 7,386 Times in 4,783 Posts	partial WS,I compared your Matrix to the blue template line ( thanks Chaz! ) and it looks like your car has about 24% of the template aft-body. At this length, with a comprehensive cleanup ( take a look at AeroCivic ) you might get the Matrix to Cd 0.28 at its present length.This number is based on a factory Cd of 0.34.I'm not sure about it but it's not that important. If you extended the car to 30% aft-body you'd have a shot at Cd 0.25 and 12.5% better HWY mpg. 40%-Cd 0.20 and 20% mpg 50%-Cd 0.17 and 24% mpg These numbers will give you a feel for what's doable. If you decide that you will forever limit the cars length we can probably cheat a bit. If your reserving the option to do later further elongation of the tail,you might want to stick close to the 'template' curvature as it is 'clean' all the way down to the tip and can be used on a 'modular' basis.