Careful with the diffuser......if the transition from the flat bottom of the car to the diffuser is too abrupt you will get flow separation there and it will reduce the effectiveness of the diffuser significantly. You have to roll into the diffuser a bit, ideally you want the air to stick to the diffuser face like water flowing over the bottom of a spoon when held in a stream of water.
Also your rear axle is going to play hell with the function of the diffuser. But that's unavoidable..........
You might find more benefit having the diffuser start at the axle CL and build a flat floor from the back of the tub. That will move your aerodynamic center of pressure rearward.
Just a thought.
Good work though Aren, keep it up!
Rob
Good points Rob.
I plan to shape the transition by riveting the al sheet to the square tube with about a 1ft forward overhang, and then "tap" in a radius as well as I can and finally secure the sheet to the floor-board. But noted on the transition as smooth as possible.
the axle is, um yeah in the way lol...
I tried to really consider the position, I decide to put it more in the center or the car to move the center of pressure forward lol I figured that under the rear axle would maximize grip on the rear, but in roll if the tire starts to lift and or if the car lifts the diffuser off the ground it wont work anyway, less of an angle towards the center of the car so I am hoping it will be more consistent.
Also because the roof is causing the most lift on the car I had the thought that putting the neg pressure directly below the roof would help stabilize the car?
Well those are my thoughts, hell even if I had a parachute mounted right there, I would probably not know the difference!