Originally posted by Craig Smith
Bryan, you are correct in that the FAST system uses a fuel shutoff for rev limiting. It works well as a "last-ditch" effort to keep the engine from over-revving, but there's nothing quite like a good ol' ignition rev limiter. The MSD soft touch limiter built into most of their ignition systems is a good one, and anyone who makes an ignition system also offers some type of rev control. I would definitely set things up so that the ignition limiter is the first line of defense.
If your MSD box doesn't have the rev limiter built into it, you probably should check with MSD on how to upgrade. The separate rev limiter module they make is not compatible with their capacitive discharge ignition systems.
Craig