I wonder if there's scope to re-jig the heater box on a road car? It sits in a high pressure zone and takes up a lot of space. It's a good place to collect cold air.
On a slightly related topic, I'm about to fashion an 'undertray' for the Roadster to fill the space between the cross tubes and crank pulley. This is for two reasons - it's a big gap and makes the pulley and alternator belt vulnerable to debris being thrown up off the road, and I reckon that it will separate the airflow under the car vs through the radiator. The spoiler blocks some of the air that would ordinarily pass underneath and channels it at the bottom of the radiator, so this should keep the flows apart until just before the pulley, and might even create a pull through the radiator effect. I accept that this is aerodynamic quackery, but it's good to play.
