Why do the composite seat manufacturers not want you to drill holes in thier seats?
You hear a lot of talk about FIA-rated seats and how the manufacturers do not want the racer to drill holes in the seat to install a seat back brace. This in understandable because the seat manufacturer has no control over how and where you drill the holes. Also, these seats were not built strong enough to take a rear impact with a piece of metal across the back of the seat. What happens is that there is a sharp edge for the seat to break over. If the brace was not there the seat might bend and not break. You exchange this seat flexibility for loose harnesses. Increase the surface area of the plate behind the seat and the seat will be less likely to break. So, I can see why the manufacturers of composite seats are complaining about the current rules requiring seat back braces. These braces could allow the seat itself to break. You don’t hear any arguments out of the aluminum seat manufacturers! This is why I/O Port highly recommends aluminum seats. They are easy to mount and are even s
