Don't know the GM. But as far as I know, it's pretty programmable. I suggest you check out the manual. Here's some examples:
I've tried the limiter on an LRP Super Sport and LRP IPC V7.1.
On the Super Sport, there's only an adjustable screw. When turned the first approx. 3/4, it doesn't affect top-end. But when turned to max, the top-edn is lowered. I think it was on the last 1/4.
On the IPC V7.1 it's different. It's possible to programme the limiter AND the time it's in effect. Thoose can be programmed indepently. For example, it's possible to limit the current to 80 amps for a very short time. After that, there's no limit. Or it can be set to 80 amps. for quite a long time. In this case I don't think the car can reach top-end on normal indoor tracks.