My latest lower splitter decided it didn't want to be part of my car anymore a few weeks ago
There wasn't enough support in the center so at speed the center of the splitter most have been flapping around, I did notice the lack of support when it was in the air during the oil change a did last month.
Versions so far
V1; 6mm Ply painted with gloss black paint, this was only a trial to see what it would look like and get the shape right, it was never going to stay on the car.
V2; 6mm Ply wrapped in Carbon Fibre, to get the lead edge the right shape I had to file the edge to shape which meant the lead edge wasn't sealed against the weather, this allowed water to get in between the ply's and eventually blow them apart.
V3: 6mm High density foam board, this was almost perfect
, easy to cut, correct colour to start with and light, the only down side was the flexibility, If I'd been able to get a center support in it might have been fine but this is pretty difficult due to the lack of space under the rad and FMIC.
V4; 9mm exterior ply, Being twice the thickness of the other 2 there is no flex at all so a center support shouldn't be needed.
This one will be fully wrapped in Carbon so this time there will be no bare edges for the weather to get into.
Shape marked out, I've added another 10mm (ish) to the over all size.
Test fit
I want to round the top lead edge off a bit to soften it up a bit and then it will be fully wrapped in 2 twill carbon fibre
I ordered it today so should hopefully be here tomorrow.