Btcc use 11mm ply and stick it out about 6inch, no big budget needed for that!
Im going to be buying one of the cm splitters eventually, they do work.
What else can you do on a clio for 140quid to improve it? Not a lot. Lose weight is free, decent suspension is expensive, engine work is expensive for minimal gains, so what is better for your money? Bit of aerodynamic stability is always a winner in my eyes
Not particularly up on the BTCC. Does a bloke just cut a random shape out of a bit of ply and guess where approximately to nail it on? Just because the material is cheap (chosen for good reasons no doubt), doesn't mean the whole approach is guesswork. The aero on NGTC seems to be quite restricted, including the front splitter, so I suspect that plays a part in the seemingly low tech approach. Though I expect more effort has gone into the shape and positioning than you are giving them credit for, not to mention the impact of the flat floor and the rest of the body panels being bespoke. Given the tight regs, any area of potential advantage will be exploited, budget permitting. If it was as simple as chucking a splitter at the car, race teams wouldn't invest untold millions in CFD and wind tunnel testing.
As I've been trying to say all along, you need to define "works" and "well designed". If you're looking to modify the aerodynamic performance of a car, opening the window "works", it doesn't mean it works well. If this splitter creates 0.1% of additional downforce, it's technically working, but is probably entirely indiscernible to most users. As I have said all along, no one with a brain would deny the potential benefits of a well designed aerodynamic device. What I am questioning is the evidence that this is well designed.
As I said, tuition will gain more time than a splitter ever will.
To each his own.