Can a rev limiter keep engine RPM below the redline?
In the case of “neutral” or shifting up too late, a rev limiter can easily keep engine RPM below the redline. If a manual transmission is shifted down too early, the speed of the vehicle will drive the engine over the redline. In this case, a rev limiter will cut engine power but it cannot prevent the engine’s RPM from going beyond the redline.
What causes the rev limiter to bounce off the throttle?
These types of limiters activate at the set RPM and “bounce” off of it if throttle is applied. The “bouncing” occurs because the limiter will cut off fuel or spark at the set RPM, which causes the RPM to drop. If the engine is in a state of open throttle when the RPM drops, the RPM will then raise back to the limit.
Do you need a rev limiter on an automatic transmission?
In the case of an automatic transmission in “drive” mode, the engine RPM stays safely within the range that the transmission chooses. Only when over revving the engine in “park”, “neutral” or “manual” modes is there any need for a rev limiter. These vehicles often do not include a tachometer.
When is the second stage of the rev limiter activated?
The second stage is activated after launch to set a higher RPM limit for wide-open-throttle acceleration. There is considerable variation between manufactures on where to have the redline for their engines: from 100 to 12,000 RPM.
How does the rev limiter on an engine work?
Any engine is only designed to be able to function up to a certain speed, which we measure in revolutions of the crankshaft per minute. Out of the factory the rev limiter is set at the point the engine’s maker is happy for it to rev to on a regular basis.
What’s the difference between hard and soft rev limiters?
You’ve probably heard of ‘hard’ and ‘soft’ limiters. Hard limiters are the ones that you slam into with an unpleasant jerk as the engine’s power is suddenly cut. Soft limiters slow the revs more gradually, like the engine is pushing against a coil spring.
Is it safe to raise the rev limiter?
With modifications to your motor you can safely raise the limiter; a process that can even be done with aftermarket tuning software. Rev limiters are their to protect the heart of your pride and joy, so it’s best to respect them. 11comments CommentSign in to postCancel Sort by BestSort by Latest Show Comments