Nitrous and speed limiter

I run speed controlled 2-stage nitrous setup.
In some shorter tracks we have max speed we may run.
If I put speed limiter in M800, does it shut off nitrous before it begins cut ignition same way as RPM limiter?
In some shorter tracks we have max speed we may run.
If I put speed limiter in M800, does it shut off nitrous before it begins cut ignition same way as RPM limiter?