Quote:
Originally Posted by aerohead
1) The OEM rear spoiler terminates along the AST-III contour. Local streamlines have already 'widened', with lower velocity, and higher pressure. Any extension, unless angled downwards, will only constrict the streamlines, re-accelerate the flow, lower pressure, and increase base drag.
2) If you had a full belly pan, it looks as if an 'all-metal' diffuser, in full contact with the bottom of the tailpipe, would give you a 'slow' diffuser, best known for low drag.
3) Extending the B-Pillars ( the MR-2 doesn't have C-Pillars ) as flying buttresses, with plan-taper, as Ferrari and Lamborghini have used, along with a 'narrowed' rear spoiler could be even better.
These changes helped me get to Cd 0.235
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I think you're misstaking my MR2 with a different car:
1. It has no OEM rear spoiler
2. Yes, a mild diffusor might be possible, although that's more of a mildly angled bellypan than a diffusor
3. It does not have B-pillars as it's a convertible