Sorry for the somewhat off-topic post. I run a car for
short sprint races (<3 miles) around race circuits in the UK. I have a small bike engine in the back of my car, which means reducing drag is important for going quickly. Previously, I had a rear wing with a 300mm chord and a 10mm Gurney on the trailing edge, which I've replaced with a 200mm chord rear wing and no Gurney. I'd appreciate any ideas from the knowledge-base here on how I can reduce drag to go that bit quicker.
Three photos attached show the front and the rear of the car, albeit with the old rear wing. The two intakes above the front splitter don't appear to do anything. Am I best off blocking these up?