In the last Century I was firmly in the orbit of the VW Beetle. Folk wisdom identified some helpful modifications, mostly smaller front tires and a nose down stance.
Lately I've gotten the feeling that the 21st Century belongs to the Geo Metro/Firefly. I went to the recyclers yesterday and there were two others in the parking lot. A beater just showed up in the neighborhood. A month ago I talked to someone in a parking lot that had one same year, model and color.
I've found a piece of louvered metal big enough for a grille block. I'm not above jamming a spike in each louver opening to widen them out. What percentage of air to block? 80/20? I will remove the remaining mudflaps and would like to fabricate spats for all four wheels. Any thoughts on size and placing? Bigger is better? The size of a business envelope?
ecomodder.com/forum/showthread.php/402-original-miles-2000-chevy-metro-1-0-a-39801.html#post658140
ecomodder.com/forum/showthread.php/massive-air-dam-98-geo-metro-firefly-b-9732-3.html#post555059
It looks like a flat plate, time attack style, would increase air pressure at the radiator face. Does adding a bluff faced air dam do anything more?
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My next goal is likely a four-wheel alignment. Not an aero question but are there preferred settings?
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Further along is a Kammback. I'm curious whether a minimal Fachsenfeld-edged boxed cavity would be of any help.