My C300 "farts" in Sport+ mode. Why?
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2016 C300
Originally Posted by xMB007x
Yes I know that but I'm not a fan of the way it changes gears as it feels like it chokes when it shifts. I feel sport mode shifts faster & smother than sport+. To me the only benefit for sport+ mode is the pop sound.
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From: Cambridge, MA
2015 C300 Sport 4MATIC
That noise is not un-burnt fuel in the exhaust. Its the blow off valve from the turbo venting into the airbox. If you vented it to atmosphere, it would make a "PSSSHHHHH" noise, that I assume Mercedes didnt want in a non-sports car, so they vented it back to the airbox to quiet the sound.
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2021 E450, 2020 C43, 2015 C300, 2007 C280
Got numbers?
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2016 C300
Honestly nobody on the road can tell the difference between a C450, a C300, or a C400. They're all just small Mercedes sedans to the driving public. You could probably toss the CLA in there too. If being seen in a "hot" car is a priority find a nice CPO CL or SL with an AMG package. Way sexier.
Last edited by Mike5215; May 7, 2016 at 10:53 AM.
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From: Eastern Massachusetts
2021 E450, 2020 C43, 2015 C300, 2007 C280
My V12 C-Class
Honestly nobody on the road can tell the difference between a C450, a C300, or a C400. They're all just small Mercedes sedans to the driving public. You could probably toss the CLA in there too. If being seen in a "hot" car is a priority find a nice CPO CL or SL with an AMG package. Way sexier.
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Joined: Apr 2010
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From: Eastern Massachusetts
2021 E450, 2020 C43, 2015 C300, 2007 C280
Performance theater
Performance theater - the car doesn't go any faster. The fart sounds are just a memory of the defects of obsolete carburation technology. The irony is that that the car enthusiasts who would otherwise be most likely to be impressed are too young to remember when this is what hot cars did. "Why is that car doing that?" "Is there something wrong with it?" Mike5215 has it right. If you want people to see you as the driver of a hot car, buy a hot car. 
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C43
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Benz
lol
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From: BNE, Australia
W205 C250BT
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Joined: Dec 2021
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C300 4Matic 2016
Replacing B70 Crankshaft Hall Sensor fixed this issue
Ignore post, because my response was meant for another thread discussing an acceleration issue.
Last edited by DJPMA; Dec 8, 2021 at 05:21 PM. Reason: Posted to wrong thread by accident
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W205
Performance theater - the car doesn't go any faster. The fart sounds are just a memory of the defects of obsolete carburation technology. The irony is that that the car enthusiasts who would otherwise be most likely to be impressed are too young to remember when this is what hot cars did. "Why is that car doing that?" "Is there something wrong with it?" Mike5215 has it right. If you want people to see you as the driver of a hot car, buy a hot car.
