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C43 'launch' question - transmission damage ?

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C43 'launch' question - transmission damage ?

 
Old 02-20-2019, 08:49 PM
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C43 'launch' question - transmission damage ?

Given that there is no launch control in the 2017 C43, hard braking then mashing the throttle is the only option.

At what point can doing this damage the transmission ?

How do others attempt this ? At what RPM do you release to get a good start and where is Boost showing as ?

Thanks
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Old 02-20-2019, 10:13 PM
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2k boost. Hold it for 15+ seconds and you will get your damage...
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Old 02-21-2019, 12:08 AM
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Originally Posted by jaap74 View Post
Given that there is no launch control in the 2017 C43, hard braking then mashing the throttle is the only option.

At what point can doing this damage the transmission ?

How do others attempt this ? At what RPM do you release to get a good start and where is Boost showing as ?

Thanks
Launching before a car has fully warmed up can definitely cause damage. I've never had a Merc with launch control but can confirm that BMW M cars have a stringent set of requirements that need to be met before launch control is allowed. It's not recommended as something the driver should be making a habit of.
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Old 02-21-2019, 09:20 AM
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If youre needing to launch your C43 regularly you probably bought the wrong car. Ive never launched it myself and while its tempting, I also dont want to cause permanent damage to my engine.
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Old 02-21-2019, 04:23 PM
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I got my car tuned therefore just wanted to know my new 0-100 km/h time, it's not a regular event at all.

Pre-tune was 5.1 secs, post tune 4.7 which I think is pretty poor hence my question. My attempts were done at no less than 28 degrees C (82 F) which I think is not optimal, I'll give it another go when the weather cools down :-)
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Old 02-21-2019, 04:45 PM
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Yeah, you will want cooler, denser air but with warm tires. GL
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Old 02-21-2019, 05:41 PM
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5.1 is pretty high even in 82F temps. What RPM are you launching at?
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Old 02-21-2019, 06:49 PM
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Yeah those times are pretty terrible, stock and tuned.
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Old 02-22-2019, 12:22 AM
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Originally Posted by evoi19 View Post
5.1 is pretty high even in 82F temps. What RPM are you launching at?
Not sure to be honest, will pay more attention at my next attempt
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Old 02-22-2019, 12:22 AM
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Angry

Originally Posted by ShakyTom View Post
Yeah those times are pretty terrible, stock and tuned.
I know !
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Old 02-22-2019, 08:32 AM
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don't hold past 2200 rpm and you'll be fine on the brake boost. I don't find my self launching all the time as a courtesy for the driver behind me. I usually try to launch only when its just me. I am tuned so spinning all 4 wheels is not an issue and don't want to throw rocks at the car behind me. as long as you aren't doing it every day I wouldn't worry about it.
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Old 02-22-2019, 07:53 PM
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Originally Posted by Star4life View Post
don't hold past 2200 rpm and you'll be fine on the brake boost. I don't find my self launching all the time as a courtesy for the driver behind me. I usually try to launch only when its just me. I am tuned so spinning all 4 wheels is not an issue and don't want to throw rocks at the car behind me. as long as you aren't doing it every day I wouldn't worry about it.

You're very polite to those behind you!
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Old 02-22-2019, 09:56 PM
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I have launched the car more than 500 times I am sure. (8 track days with an average of 20 hard launches, and countless dragy sessions of me in an empty road) and nothing has changed so far. Ofcourse how you launch matters a lot. If you hold the RPM at anything above 2000, it is a problem, which a lot of people do. Holding is bad, cant emphasize that enough. The correct way is to press the gas pedal, and when the rpm needle is swinging towards 2200, the moment it reaches it, let go of the brakes. (3.4s 0-60, dragy verified ).
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