A
set amount of RPMs which your engine can put out before you pretty much blow it up. This is usually where your numbers on your tachometer start turning
red, just be sure to keep it out of the
red or else $$$$ will be needed. For instance, the redline on my 95 Jeep Grandcherokee is 5,
300 RPMS that is exactly where they start turning
red, some cars have a rev limiter on them, so due to my rev limiter the engine will not go past 5,300rpms and the engine starts "bouncing" meaning the needle will do the same. I advise you not to try this.