After my turbo install the car has been extremely fun and plenty fast for my current suspension/tire combo. I just went to the match tour event in Bristol, TN and got to see some really high level autocross cars. I think my car has comparable hp/weight to a few of the high contenders but I am having traction issues. When the car was NA it really wasn't as hard to drive on mechanical grip alone. Now the car has a bit more than double the power and I feel it needs some aero assistance in the rear. It is just a bit loose.
The car is right at 1900lbs without me in it and race prepped (not hard top, glass, passenger seat, and 3/4 tank).
Bilstein HDs with Ground Control sleeves (440/300), 1"/2.0" extended top hats, RB 1.125 hollow with HD mounts and RB endlinks, no rear bar.
Storm S1s 15x9 with new 225 Rival S
I want to ask a few things about the spoiler I am currently building and maybe spark a decent discussion along the way.
I am currently looking at going about 14" in height (12" supports) and a maximum AOA of ~50 degrees. Measured like this...
I am making 3 supports out of 1.5 x 1.5 x1/8 inch aluminum L stock
3 home depot turn buckles rated at 150lbs each
Lexan or some other quality brand of poly-carbonate (transparent so I can still see out the back since I drive this car on the road to events and some mountain fun.)
Closest one in the photo was a mock-up for proof of concept.
Cardboard is about 18" tall.
So the further I get into this the more I question. I don't have any front aero, outside of a GV rep lip and I am concerned on how large I can go before I need a splitter. Is there any testing with this? I have read a few things on the BlackBird Fabworx spoiler and a few have commented on how nice it is but I see little autocross data with it.