STI Wing, performance?
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Registered User
Joined: Jan 2005
Posts: 40
STI Wing, performance?
obviously, the wing does give downforce.
How much though, is it noticeable when the wing is removed? More understeer? The *** not sitting down on the track, etc?
I plan on getting an STI but without the STI wing (instead, maybe the regular wrx sti wing like the spec-c).
any help, graphs/charts would be great.
Also, how is high speed stability, etc? I know it should go faster b/c of less drag.
How much though, is it noticeable when the wing is removed? More understeer? The *** not sitting down on the track, etc?
I plan on getting an STI but without the STI wing (instead, maybe the regular wrx sti wing like the spec-c).
any help, graphs/charts would be great.
Also, how is high speed stability, etc? I know it should go faster b/c of less drag.
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Joined: Apr 2004
Posts: 175
From: Lusby, MD
Car Info: '02 2.5 RS
Please do a search. I remember there being at least a couple big discussions on this.
Anyway, IMO it is no big deal removing it. It does create a significant amount of downforce, but any loss in grip would only be a problem at 100+mph and still not that bad.
Anyway, IMO it is no big deal removing it. It does create a significant amount of downforce, but any loss in grip would only be a problem at 100+mph and still not that bad.
To quote a quote from another thread:
http://forums.nasioc.com/forums/showthread.php?t=697270
http://forums.nasioc.com/forums/showthread.php?t=697270
I measured my STi wing as carefully as I could, and then used the LARC wing simulator to calculate the downforce. I assumed the following parameters:
Thickness: 25% of chord (2.0 in)
Camber: -6.5% of chord (-0.5 in)
Chord: 8 inches
Span: 4 feet
Angle of attack: -1.2 degrees
Altitude: sea level
These seem to be the best match to the STi, as well as I could do with just a tape measure. I assumed that the angle of attack was the angle of the top of the wing end plates. I measued this angle with geometry, not a level, so the angle of the car on the ground did not effect the measurement.
The calculated downforce is 60 lb at 100mph. At 150 mph, the downforce is 140 lb. These are increases in download on the rear axle of about 5% and 10%, assuming 60-40 f/r weight distribution. These are the numbers for the top wing only, not the deck lid spoiler, which will add a little more. These numbers are not insignificant.
Thickness: 25% of chord (2.0 in)
Camber: -6.5% of chord (-0.5 in)
Chord: 8 inches
Span: 4 feet
Angle of attack: -1.2 degrees
Altitude: sea level
These seem to be the best match to the STi, as well as I could do with just a tape measure. I assumed that the angle of attack was the angle of the top of the wing end plates. I measued this angle with geometry, not a level, so the angle of the car on the ground did not effect the measurement.
The calculated downforce is 60 lb at 100mph. At 150 mph, the downforce is 140 lb. These are increases in download on the rear axle of about 5% and 10%, assuming 60-40 f/r weight distribution. These are the numbers for the top wing only, not the deck lid spoiler, which will add a little more. These numbers are not insignificant.
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Posts: 10,029
From: Sacramento CA
Car Info: 02 Impreza WRX sedan
Origami posted by comptechgsr
I know it should go faster b/c of less drag.
I know it should go faster b/c of less drag.
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