Race tracks are scary places. There’s flying debris everywhere. Little rocks, bits of rubber, and sometimes even pieces of cars. At 130MPH, almost anything can become a tiny missile looking for a radiator or other cooler to puncture. Closing up openings in the bumper with some wire mesh is cheap insurance to prevent a race- or weekend-ruining accident.
Remember that the poly bumper is floppy!
Then go back and cut off every… single… little… poky… stabby… razor-sharp bit.
Yes, you could have used a slightly bigger mesh which may have been less razor-sharp stabbyness. But a bigger mesh means that bigger things can get through the mesh and into your coolers. I used 1/4″ mesh, but it comes in varying sizes. Granted, a large enough object is just going to blow up the zip ties and smash through anyway. But if you expected a little wire mesh and zip ties to stop a boulder, well, you might need a different hobby.
This car and all its failures have taught me a lot of patience! So I channeled my inner zen and got to trimming.
A quick pass with a file or sanding wheel afterward will also help quite a lot. It really just boils down to how deeply you want to cut yourself when you are digging around in here to do something.