Quote:
Originally Posted by aerobod
Normally there are 4 mitigating strategies as the rev limit is near to prevent over-revving, typically in the order listed to prevent sudden power loss:
- timing retarded
- boost reduced / wastegate opened
- ignition cut
- fuel cut
All will affect the engine noise to some degree. There is no reason the engine should go above the rev limit due to throttle application, if the strategies are applied correctly. Under load there isn’t any problem hitting the rev limiter, but just revving the engine without load up to the limiter can potentially cause issues due to the faster component acceleration and consequent higher loads on components such as the valve train. As many manufacturers do, BMW may put a lower rev limit on the S58 when unloaded, except for brief throttle blips when down-shifting.
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Super insightful. Was under load during that quick moment. From what I’m understanding on what you wrote, those strategies worked as intended during that case. Thanks for the deep dive, really helpful.
Quote:
Originally Posted by Dave07997S
You can still do a mechanical over rev. Ie: down shifting into 2nd at 100mph. If you have an auto it's impossible as the auto won't allow it to shift down.
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Agreed, ye ole “Money Shift”.
Aka my biggest fear.