Why does my car feel slow?
From a stop, if I floor it in sport+ mode it probably takes the car a little under 6 seconds to hit 60 mph. Sport and comfort modes are even slower. Race mode is not much faster.
I noticed in the dashboard you can select the amg performance monitor and it'll give you a boost guage and tell you how much horsepower the engine is putting out.
Sometimes I see guage showing boost in sport mode but most of the time it's at 0 - and I never see it go past 0 in sport+ mode. The horsepower guage will never go over about 330 either.
Is this just something wrong with the ECU? I had a 2017 Audi S6 before this Mercedes and the S6 actually felt faster...
Last edited by coldmoldy; Feb 2, 2018 at 05:49 PM.




Take it to the dealer.
I only discovered this boost guage yesterday so I took the car out for a drive again today. If I floor it the boost meter maxes out and then shuts off and the car is sluggish until I turn it off and start it up again.
Anyway, I'm dropping the car off at the dealership on Thursday. I'll let you guys know what they say.
I only discovered this boost guage yesterday so I took the car out for a drive again today. If I floor it the boost meter maxes out and then shuts off and the car is sluggish until I turn it off and start it up again.
Anyway, I'm dropping the car off at the dealership on Thursday. I'll let you guys know what they say.
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From a stop, if I floor it in sport+ mode it probably takes the car a little under 6 seconds to hit 60 mph. Sport and comfort modes are even slower. Race mode is not much faster.
I noticed in the dashboard you can select the amg performance monitor and it'll give you a boost guage and tell you how much horsepower the engine is putting out.
Sometimes I see guage showing boost in sport mode but most of the time it's at 0 - and I never see it go past 0 in sport+ mode. The horsepower guage will never go over about 330 either.
Is this just something wrong with the ECU? I had a 2017 Audi S6 before this Mercedes and the S6 actually felt faster...





I'd take it to the dealer and have them check it out, sounds like you have a issue with the car.