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C63 w204 2012 limiting power on dyno 5th gear

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Old Feb 7, 2025 | 12:51 PM
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Ssinghr's Avatar
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C63 w204 2012 limiting power on dyno 5th gear

Hello ,
New to this forum so would appreciate any insight
I recently took my c63 w204 for a stage 1 tune and it produced 404 bhp on the first run at the engine. After tuning it managed to achieve 484bhp however the tuner said it was limiting revs and cutting off at 5th gear around 6k rpm and not revving to red line. Could this be due to a previous owner using less than 98 octane fuel so the gearbox is adapting and reducing the power output ? Finally how would an issue like this be resolved, would i need a gearbox map or is there a way to sort this without spending more on tuning. Car is currently full with 99 octane however there was a quarter tank with i suspect just 97 or less octane fuel.


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Old Feb 7, 2025 | 12:55 PM
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Originally Posted by Ssinghr
Hello ,
New to this forum so would appreciate any insight
I recently took my c63 w204 for a stage 1 tune and it produced 404 bhp on the first run at the engine. After tuning it managed to achieve 484bhp however the tuner said it was limiting revs and cutting off at 5th gear around 6k rpm and not revving to red line. Could this be due to a previous owner using less than 98 octane fuel so the gearbox is adapting and reducing the power output ? Finally how would an issue like this be resolved, would i need a gearbox map or is there a way to sort this without spending more on tuning. Car is currently full with 99 octane however there was a quarter tank with i suspect just 97 or less octane fuel.
Hmmm, does it still do it when in dyno mode?
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Old Feb 7, 2025 | 01:28 PM
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Yeah it was in dyno mode and even when the gearbox was in manual mode it would still cut off and not rev to redline. Would it make a difference if the car was not in dyno mode?
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Old Feb 7, 2025 | 03:01 PM
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Originally Posted by Ssinghr
Yeah it was in dyno mode and even when the gearbox was in manual mode it would still cut off and not rev to redline. Would it make a difference if the car was not in dyno mode?
Hmmm, I wouldn't think so.
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Old Feb 8, 2025 | 05:27 PM
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'10 C63
Stock tune has a speed limiter at 155 mph. That’s why it won’t rev out.
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Old Feb 8, 2025 | 05:55 PM
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Originally Posted by chrisridebike8
Stock tune has a speed limiter at 155 mph. That’s why it won’t rev out.
I see, that might be it.
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