It simply removes the 'Soft' cut off that begins at 6,800 RPMs and allows the engine to produce full power from 6,800 - 7,300 RPMs. How does Sport Chrono affect the Rev Limiter? - Sport Chrono does not change the cut off RPM, which remains at 7,300 RPMs on cars with or without Sport Chrono Package. All 987/997 models come with a Soft Rev Limiter. If a driver ignores this, ignition timing is retarded further until the rev limit is reached at which point the resulting cut off is much 'softer' because the engine is not being cycled on and off between full power and no power. As the ignition timing is retarded and power drops off, the resulting feeling of power loss signals the driver that it's time to shift. This usually begins about 500 RPMs before the hard cut off point. A Soft Rev Limiter reduces power output by retarding ignition timing as the engine approaches its limit. Soft Rev Limiter - Because hitting a hard rev limiter can be uncomfortable for the driver and hard on the car, manufacturers created the 'Soft Rev Limiter'. The very first rev limiters installed were all hard rev limiters. This can be very abrupt and hard on the power train as the engine cycles on and off between full power and no power. Hard Rev Limiter - The most basic of rev limiters, a Hard Rev Limiter does nothing until the engine reaches the predefined engine speed at which point fuel and ignition are shut off. What is a Rev Limiter? - A rev limiter is a safety device that cuts fuel, ignition or both at a specified RPM to prevent an engine from continuing to rev beyond its mechanical safety limit. Here is some clarification that will help you to understand some of the functions:.The Porsche Sport Exhaust will automatically switch to its' sport sound.(PDK also has Sport+ mode, more info below) The Triptronic S/ PDK transmission will switch to a more aggressive shifting map that keeps the engine ready to go.The Soft Rev Limiter is replaced with a Hard Rev Limiter allowing you to get full power all the way to redline (more info below).(In normal mode PSM triggers if one wheel is about to lock up, in sport mode it triggers when two wheels are) PSM (Porsche Stability Management) intervention limits are increased to allow more aggressive driving without triggering a system response.PASM is switched to Sport Program to provide more crisp handling and less body roll. ![]() ![]() ![]()
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