[LuckyKid]

I am working on some drag reduction on our endurance racecar and I wanted to pick some brains from the hypermile'r world.

Our rules allow us to repurpose material from the car in other areas. If we use wood, metal or plastic stock then we are charged "points". We basically have no points left, so we are reusing some of the rear bumper, a splash sheild and door cards. I also have some metal from the bottom of the fenders and some trim pieces.

The biggest area I see is the rear of the car. I can extend out to 12" from the rear of the car and I already have a diffuser at a max angle that extends out that far.

I am running an airdam, splitter, flat floor, diffuser and a custom fast back (reused bumper). The radiator is sealed and ducted and I have a vented hood with gurney flaps to improve extraction. I also have vented fenders, on the top for pressure reduction and reduced lift and the rear of the fenders vented to relieve well pressure.

I have a mock up here of what I want to do in the rear with a splash shield and door cards. I have an approximate 14 degree slope off of the fast back.

I don't want to cover the fenders because of brake cooling and we need to change tires.

We are only at 145whp, so drag reduction is important for overall lap times.

Does anyone have any other tips and tricks, additional input would be greatly appreciated.