I love the creativity of your mods, especially the adjustable grill block.
I don't know how detailed you want to go with aerodynamics, but if I had a tigra, this is what I'd do...
Rear tire boat-tail: Since Italy has length laws, I would install "kammback" boat-tails. While it wouldn't be as useful as a true boat-tail, it will help.
Kammback Boat-tail
Full Wheel Fairings: Ideally, the wheels should eventually be enclosed in streamlined fairing. The FWS, in addition to wheel covers, kammback boat-tails, and front splitters will create the lowest drag condition. This technique can be seen on solar cars. Personally, I'd also connect the front and back wheels with a full length side-skirt.
Full Wheel Fairings
Underbody Panel: You already have an excellent underbody panel, but I would cover up the exhaust with aluminum or another heat-resistant/conductive material. Others on this site have done it without a problem. I'd also look into building a rear diffuser to help minimize the car's wake.
Rear Diffuser
Side Mirrors: I'm not familiar with the Italian vehicle code, but I'd lose the passenger side mirror if it is legal and you are comfortable doing so. It'll make a minor decrease in drag, but every bit helps. Functionality can be partially restored with an interior side-view mirror.
Fastback Fairing: As you stated in your other thread, a fastback fairing would certainly help lower drag by decreasing the roof angle. I think it would be important to fair it into the sides of the car with generous radii.
Cooling System: If you get
really ambitious
, you could create a radiator duct and
vent the air over the hood. This would decrease cooling drag, which is a major contributor to overall drag, and lower the cL. This would not be easy to do, though.
Radiator Duct
Minor Details: If I wanted to do
everything, I would tape every seam of the car and make sure the surface is waxed and
smooth.
Just some thoughts to consider.
- LostCause