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Old 10-07-2004, 10:13 AM   #1
BIGSKYWRX
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Default CD and frontal area differences between 02/03 vs 04+ and sedan vs wagon???

I've yet to find any solid info on any differences between 02/03 bugeyes vs the newer style concerning CD's or frontal areas. The numbers I've seen thrown around are .33 for both and frontal area of 2.2 sq meters. Most older articles you read from the different mags talk about improved CD w/ the new body style? Just by looking at the two it appears there would be a slight difference (maybe looks are deceiving) in both CD and frontal areas.

I've also read several threads that hinted around the wagon "should" have a slightly better CD than the sedan, but nothing in "black and white".

Anybody see anything different around?

Thanks

Big Sky
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Old 11-02-2004, 11:41 PM   #2
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bump
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Old 11-03-2004, 12:10 AM   #3
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The only dissenting opinion I've found is here: http://www.carpages.co.uk/subaru/sub...cho=1064067517

"The drag coefficient for all saloons is now 0.33 Cd with the GX Sport 5-door recording 0.34 Cd and the WRX 5-door 0.37 Cd."
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Old 11-03-2004, 12:21 AM   #4
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That's interesting! What is the GX Sport? The WRX five door must be the wagon-wow good cd # there
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Old 11-03-2004, 09:36 AM   #5
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You know what's interesting......the first gen legacy has exactly the same drag coefficient 0.33

I did the calcs for the frontal area, but don't have them off the top of my head. I placed some big halogen lamps behind the car and traced the shadow on a huge piece of cardboard and calculated out the frontal area. It's probably not quite as accurate, but it's pretty close.
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Old 11-03-2004, 09:55 AM   #6
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Well, I heard that the design was influenced by the WRC team.

My opinion: When I rode around in my brothers bugeye wrx, I noticed that when it's raining, water fly's off the headlights & hits the windshield, but it doesn't do that in MY04.
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Old 11-03-2004, 10:06 AM   #7
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I've also read the front redesign was done for aero purposes, yet they put the same cd down (which I guess it could be). I might have to give SOA a "jingle".

Could the sedan have that much better cd? 0.33 vs 0.37

Big Sky

Last edited by BIGSKYWRX; 11-03-2004 at 11:58 AM. Reason: put wagon, meant sedan
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Old 11-03-2004, 10:33 AM   #8
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If the wagon is 0.37 and the sedan is 0.33 then the wagon has MORE drag than the sedan.
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Old 11-03-2004, 10:52 AM   #9
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Indeed.. smaller Cd means more slippery. Power = V^3 * Cd * A. Smaller A (frontal area) or smaller Cd causes a reduction in the power required to obtain a given V (velocity)
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Old 11-03-2004, 11:03 AM   #10
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Quote:
Originally Posted by D_REX
If the wagon is 0.37 and the sedan is 0.33 then the wagon has MORE drag than the sedan.
That's what I was thinking too.

I would think that the wagon has less drag though since the air is smoother longer since you don't have the distubance of the decklid.
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Old 11-03-2004, 11:57 AM   #11
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Mis-spoke (typed). I've always heard that the hatch/wagon version of different cars had lower cd's- could vary depending on car I guess. It seems odd that there would be that big of a difference. Also odd that most sites list no difference between 02/03 vs 04+- sedan or wagon- clearly some aero changes made.
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Old 11-03-2004, 12:12 PM   #12
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BTW some of you guys may be interested in the excel files I have. It shows a vehicles performance based on power, gearing, cd, rolling resistance, etc. They were originally from my engine design course at school, but I have updated them for a stock WRX or STi.

http://www.freebmw.net/mbiker97/Smart/Vehperf%20WRX.xls

http://www.freebmw.net/mbiker97/Smart/Vehperf%20STi.xls
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Old 11-03-2004, 12:53 PM   #13
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The redesign was also influenced by the fact that every where else but the US, sales of the bug-eyed wrx were down from previous years. If you look closely, styling cues were taken from the new legacy, like the dip in the headlight lense.
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Old 11-03-2004, 12:56 PM   #14
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Ok, found the frontal area data. I came up with 22 sq ft or 2.04 sq meters
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Old 11-03-2004, 01:20 PM   #15
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Brian Long's book ('Subaru Impreza'; Veloce Publishing 2003; ISBN 1-903706-26-2) Chapter 5 'The New Age Impreza' (i.e. bugeye) says

The [JDM] Sports Wagon (GH-GGB) kept the narrower body (Cd 0.32)

Unfortunately I can't find any mention of the equivalent sedan value, but the implication - at least as I read it - is that it was higher. There is also mention that the wider body of the sedan attracted a higher local tax rate, which might be related (lower mileage -> tax penalty?).

Concerning the revised body:

According to the promotional paperwork handed out at the event [2002 Paris Show], key features for European models included:
o Aggressive, yet more aerodynamic, new front styling
o ...


and again later:

The facelift is shared with the 2003 World Rally Car, which benefits from a similar reduction in drag coefficient and improved high speed stability

and finally in a picture caption (RHD 03 WRX sedan and wagon):

The drag coefficient was 0.33 for all saloons, 0.34 for the basic estates, and 0.37 for the bespoilered five-door WRX

If those numbers are right, the wagon would seem to have take a big step backwards
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Old 11-03-2004, 01:36 PM   #16
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Just saw where the new Legacy sedan was listed at svelt 0.28 cd and the wagon at 0.3- hmmmmm.

Interestingly the Saab 9-2X is listed at 0.35

Big Sky
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Old 11-03-2004, 08:59 PM   #17
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maybe by "improved aerodynamics" they actually meant less front end lift at high speeds, or possibly better cooling. just a thought.
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Old 11-03-2004, 10:25 PM   #18
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That's possible, I know they reconfigured the scoop to be more efficient.
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