My understanding is that the ECU can only control the engines fuel mixture and spark timing.
How does it adjust these to get such a massive drop in torque at the rpm limit?
Keeping in mind that certain variations of these at high rpm could be harmful to the engine.

Just curious. Cheers.

I believe its a fuel cut

My understanding is that the ECU can only control the engines fuel mixture and spark timing.
How does it adjust these to get such a massive drop in torque at the rpm limit?
Keeping in mind that certain variations of these at high rpm could be harmful to the engine.

Just curious. Cheers.

Definitely fuel cut. (IMHO) If it cut spark at maximum rpm, a lot of unburnt fuel would hit the very hot catalytic converter and destroy it.
And yes, bouncing off the rev limiter can be harmful to the engine. So don't do it deliberately. lol

Anyhow, logic tells me it's a fuel cut. If anyone has the habit of bouncing off the limiter on a regular basis, can you tell us if it is a smooth cut off, or a very sudden one? ie the engine just dies suddenly, or there is a smooth but substantial reduction in power so revs go no higher?

Anyhow, logic tells me it's a fuel cut. If anyone has the habit of bouncing off the limiter on a regular basis, can you tell us if it is a smooth cut off, or a very sudden one? ie the engine just dies suddenly, or there is a smooth but substantial reduction in power so revs go no higher?
Full power right up until the cut point, fuel cuts, revs drop a couple hundred RPM and then the cycle repeats until you dump clutch/let off throttle/valves go through bonnet.

Bee*R limiters are so much more fun.

Full power right up until the cut point, fuel cuts, revs drop a couple hundred RPM and then the cycle repeats until you dump clutch/let off throttle/valves go through bonnet.

Bee*R limiters are so much more fun.

Bit rough on the power train, methinks. lol

Full power right up until the cut point, fuel cuts, revs drop a couple hundred RPM and then the cycle repeats until you dump clutch/let off throttle/valves go through bonnet.

Bee*R limiters are so much more fun.

Yes fuel cut seems the logical explanation.
There is a strong drop in power for about 0.4 of a second, then total total power loss.
I lifted off at that point.
Don't want 24 holes in my bonnet. lollol

Its fairly smooth from my experience, but then again iv always run full ecu replacements