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"The limit is eight grand,But the needle reacts slower then the shut down causing some needle too over ramp for a second,Making it look like 8100 rpm`s."
I doubt the needle is slow. I believe the S54 uses a 'soft' limiter which cuts back airflow to limit RPMs. From what I've read it isn't an abrupt ignition shutdown like on the earlier cars which is why you are probably getting over 8k.
Shawn
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