Hm... Windows/sunroof & fuel economy
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Rotary Freak
Joined: Jun 2004
Posts: 2,718
Likes: 1
From: Ames, IA
Hm... Windows/sunroof & fuel economy
Well, I'm back from galavanting around the Midwest in my '7. I realized something - running with windows & sunroof open SUCKS fuel.
With the windows shut, and the AC on, I was getting 25-27mpg. Running with the windows & sunroof open, I was back down to my normal 20-22. Huge difference! Something to consider for those considering removing the A/C...
(S4 NA, rebuilt engine, running 75-80mph)
-=Russ=-
With the windows shut, and the AC on, I was getting 25-27mpg. Running with the windows & sunroof open, I was back down to my normal 20-22. Huge difference! Something to consider for those considering removing the A/C...
(S4 NA, rebuilt engine, running 75-80mph)
-=Russ=-
Locust of the apocalypse
Joined: Apr 2003
Posts: 2,553
Likes: 2
From: Directly above the center of the earth (York, PA)
Didn't remove the AC for fuel economy... removed it for better cooling and less clutter.
Yep..... air drag is a bitch aint it??? thats the parachute theory there, air comes in the windows and goes out the sunroof, harder to get out the sunroof than it is comming in the windows.... there goes the MPG!!
I noticed it this weekend myself.
Yep..... air drag is a bitch aint it??? thats the parachute theory there, air comes in the windows and goes out the sunroof, harder to get out the sunroof than it is comming in the windows.... there goes the MPG!!
I noticed it this weekend myself.
Rotary Enthusiast
Joined: Oct 2002
Posts: 1,165
Likes: 0
From: California, Bay Area
Originally Posted by Cybaster
huh.... and i thought running with my sun roof open increase my down-force =D
well.... lets crack the AC then.... no point for windows and sunroofs....
well.... lets crack the AC then.... no point for windows and sunroofs....
Former Moderator. RIP Icemark.
Joined: Apr 2001
Posts: 25,896
Likes: 24
From: Rohnert Park CA
Originally Posted by Kenteth
Hey mark, do you know drag coef's by chance?
Coupes with wing/GTU rear spoiler: .312 Cd
Coupes with S4 Sport/aero package: .29 Cd
S5 Turbo: .32 Cd
Verts top open: .38 Cd
Verts top open, windows & rear deflector up: .37 Cd
Verts top closed: .33 Cd
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Like Ghandi with a gun
Joined: Mar 2003
Posts: 4,584
Likes: 0
From: Rapid City, SD
Originally Posted by Icemark
Coupes without any areo effects: .315 Cd
Coupes with wing/GTU rear spoiler: .312 Cd
Coupes with S4 Sport/aero package: .29 Cd
S5 Turbo: .32 Cd
Verts top open: .38 Cd
Verts top open, windows & rear deflector up: .37 Cd
Verts top closed: .33 Cd
Coupes with wing/GTU rear spoiler: .312 Cd
Coupes with S4 Sport/aero package: .29 Cd
S5 Turbo: .32 Cd
Verts top open: .38 Cd
Verts top open, windows & rear deflector up: .37 Cd
Verts top closed: .33 Cd
ty
Seduced by the DARK SIDE
Joined: Apr 2001
Posts: 7,323
Likes: 2
From: Orange Park FL (near Jax)
Originally Posted by Icemark
Coupes without any areo effects: .315 Cd
Coupes with wing/GTU rear spoiler: .312 Cd
Coupes with S4 Sport/aero package: .29 Cd
S5 Turbo: .32 Cd
Verts top open: .38 Cd
Verts top open, windows & rear deflector up: .37 Cd
Verts top closed: .33 Cd
Coupes with wing/GTU rear spoiler: .312 Cd
Coupes with S4 Sport/aero package: .29 Cd
S5 Turbo: .32 Cd
Verts top open: .38 Cd
Verts top open, windows & rear deflector up: .37 Cd
Verts top closed: .33 Cd
Can the IC scoop alone make tha much difference?
Where else is the parasite drag coming from?
Former Moderator. RIP Icemark.
Joined: Apr 2001
Posts: 25,896
Likes: 24
From: Rohnert Park CA
Originally Posted by SureShot
Wow - The S5 turbo's drag is a surprise.
Can the IC scoop alone make tha much difference?
Where else is the parasite drag coming from?
Can the IC scoop alone make tha much difference?
Where else is the parasite drag coming from?
Banned
Joined: Jul 2001
Posts: 2,519
Likes: 2
From: Rochester, MI
I was with GZ91Rx7 on Sunday for the 7 meet in MI, and on the way home we ran accross a mustang convertible...(fun time here we come), and as we begin to pace him for a little race action, m buddy starts rolling up the windows and closing the sunroof(that was the indication that "it's on")
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