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Originally Posted by CSG Mike
Remember that power output is linear, while aerodynamic drag is exponential.
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I certainly haven't "forgotten" that! The fact remains, the S2000 has a higher top speed.
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90-120 is the "sweet spot" where the FRS/BRZ has a superior power/drag ratio over the s2k.
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No, it doesn't. The faster you go, the more the FR-S/BRZ's lower drag should help it. But even at its top speed, the S2000 still has the advantage.
FWIW, I modded my RX-7 spreadsheet model for the FR-S (170rwhp, 0.29 cd, 2950 lb) and for the S2000 (200rwhp, 0.33 cd, 3000 lb.). Model predicts 14.9@96mph for the FR-S, 14.1@101mph for the S2000, so it's at least in the ballpark. I'm getting a max speed of the FR-S of 155mph, and 158mph for the S2000.
At 90mph, FR-S is accelerating at 5.5 ft/s^2, S2000 at 6.5 ft/s^2. Advantage: S2000
At 120mph, FR-S = 2.9 ft/s^2, S2000 = 3.4 ft/s^2. Advantage: still S2000.
If the FR-S's aero drag advantage were significant enough that it had and advantage anywhere, it would be at higher speeds and it would have a higher top speed.
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The published number, IIRC, was zero lift on the BRZ with both the "diffuser" and wing. It also reduces Cd by 0.02.
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That's impressive. This is a Subotaru developed diffuser I guess? Makes one wonder why people are developing totally flat sheet metal "diffusers" for these cars...