W212 AMG Discuss the W212 AMG's such as the E63

Race Start

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Old Apr 11, 2020 | 10:37 PM
  #1  
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Race Start

Looking for info on how to do the race start on my new to me e63s wagon. Anyone have instructions?
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Old Apr 12, 2020 | 12:28 AM
  #2  
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Originally Posted by Kjresener
Looking for info on how to do the race start on my new to me e63s wagon. Anyone have instructions?
Stop the car and put your left foot on the brake, steering straight, sport handling, then turn the dial round to RS it will come up on the screen right paddle to activate. Once you've done that you only have a few seconds to put your foot on the accelerator then pull your left foot of the brake.

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Old Apr 12, 2020 | 08:09 AM
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only thing to add to the above is:

you must apply a significant brake pedal pressure. Similar to when engaging brake 'hold' function.

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Old Apr 12, 2020 | 10:54 AM
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yea and you floor the accelerator pedal and hold it down to activate. when you are ready to launch then you release the brake.
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Old Apr 12, 2020 | 11:41 AM
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I don't know about the above... here's the sequence...
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Old Apr 12, 2020 | 11:47 AM
  #6  
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Originally Posted by brutus_tx
I don't know about the above... here's the sequence... https://www.youtube.com/watch?v=E4pYT38_WTs
yea that is what he did. you can't just tap the accelerator to active it. You have to push the accelerator pedal all the way down. Then it will hold the RPM's at around 4k. Then when you are ready to launch release the brake pedal.
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Old Apr 12, 2020 | 11:54 AM
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Originally Posted by jumpinj
only thing to add to the above is:

you must apply a significant brake pedal pressure. Similar to when engaging brake 'hold' function.
This was the key part that was missing for me. If you do everything else and it doesn't activate, you're likely not holding the brake down hard enough.

The other thing that gets me sometimes is that I forget to go into sport handling mode. It's easy forget if you're rushing.
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Old Apr 12, 2020 | 11:57 AM
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Originally Posted by amgwagonne
This was the key part that was missing for me. If you do everything else and it doesn't activate, you're likely not holding the brake down hard enough.

The other thing that gets me sometimes is that I forget to go into sport handling mode. It's easy forget if you're rushing.
Yea that is easy to forget as well. Are you doing 0-60 runs or just having fun with race mode? I was also told to hold down the traction control for 5 seconds as that fully disables the traction control. I need to do some runs with my draggy to see if it makes a difference though.
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Old Apr 12, 2020 | 12:00 PM
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Originally Posted by thabigo22
Yea that is easy to forget as well. Are you doing 0-60 runs or just having fun with race mode? I was also told to hold down the traction control for 5 seconds as that fully disables the traction control. I need to do some runs with my draggy to see if it makes a difference though.
Every now and then, if I'm sitting first in line at a red light in a secluded spot, I do race start for fun! Btw, from what I understand, if you turn off traction control entirely, race start is disabled so you'd have to brake-torque for launching.
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Old Apr 12, 2020 | 12:01 PM
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I can't turn off traction all together and floor it, with the sticky Toyo R88R's the car doesnt seem to like it and i feel like i'm going to break something. If i done race start with traction all the way off the car would just do a rolling burnout!
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Old Apr 12, 2020 | 12:01 PM
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Originally Posted by amgwagonne
Every now and then, if I'm sitting first in line at a red light in a secluded spot, I do race start for fun! Btw, from what I understand, if you turn off traction control entirely, race start is disabled so you'd have to brake-torque for launching.
ahh that is good to know. I was going to try it today with my draggy. Thanks for that info.
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Old Apr 12, 2020 | 12:14 PM
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RS is not as fast as brake boosting the AWD cars. My best 60' using RS was 1.9 sec. My best brake boosting with TC off was 1.7 sec 60' with a smattering of 1.8's and one freak 1.6.
I can't wait to try RS with a TCU tune to see if it improves matters...
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Old Apr 12, 2020 | 12:18 PM
  #13  
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Originally Posted by brutus_tx
RS is not as fast as brake boosting the AWD cars. My best 60' using RS was 1.9 sec. My best brake boosting with TC off was 1.7 sec 60' with a smattering of 1.8's and one freak 1.6.
I can't wait to try RS with a TCU tune to see if it improves matters...
Good info thanks for sharing. How many rpms are you launching at with brake boosting the same as RS at 4k? Where you getting a TCU tune from? I think Renntech is the only company that offers one and its $3.7k :/
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Old Apr 12, 2020 | 12:41 PM
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Renntech are resellers... there are options available in Europe and I believe some other options are opening up in the US in the near future.
Withe respect to brake boosting, with TC all the way off, I'm releasing the brake as the RPMs are sweeping past 2K... and launching somewhere around the 2500 rpm mark.
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Old Apr 12, 2020 | 12:53 PM
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Originally Posted by brutus_tx
Renntech are resellers... there are options available in Europe and I believe some other options are opening up in the US in the near future.
Withe respect to brake boosting, with TC all the way off, I'm releasing the brake as the RPMs are sweeping past 2K... and launching somewhere around the 2500 rpm mark.
Good to know thank you sir.
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Old Apr 12, 2020 | 01:03 PM
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Thanks all for the info, heading out to try it now! I hadn’t even noticed the “RS” at bottom radius on selector knob! Appreciate all the responses.
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Old Apr 12, 2020 | 11:56 PM
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Originally Posted by Kjresener
Thanks all for the info, heading out to try it now! I hadn’t even noticed the “RS” at bottom radius on selector knob! Appreciate all the responses.
Short video on M157 race start operation

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Old Apr 13, 2020 | 11:21 AM
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Isn't Race Start technically brake boosting, too?
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Old Apr 13, 2020 | 01:00 PM
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Originally Posted by Blade Canyon
Isn't Race Start technically brake boosting, too?
It's different. Context: our transmissions use a wet clutch instead of TC.

For race start, it's similar to a manual trans/dual-clutch launch: 1) it revs up with the clutch completely disengaged, 2) gradually engage the clutch to launch.

When you brake-torque, the clutch is engaged and you're rubbing the clutch plates together, which provides resistance and therefore allows your boost to build. It's more wear on your clutch but allows for better launches due to how relatively unaggressive race start's clutch engagement is. If you compare to, say, Porsche's launch mode, it basically dumps the clutch whereas our trans kinda feathers it out a bit.
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Old Apr 13, 2020 | 04:55 PM
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Originally Posted by amgwagonne
It's different. Context: our transmissions use a wet clutch instead of TC.

For race start, it's similar to a manual trans/dual-clutch launch: 1) it revs up with the clutch completely disengaged, 2) gradually engage the clutch to launch.

When you brake-torque, the clutch is engaged and you're rubbing the clutch plates together, which provides resistance and therefore allows your boost to build. It's more wear on your clutch but allows for better launches due to how relatively unaggressive race start's clutch engagement is. If you compare to, say, Porsche's launch mode, it basically dumps the clutch whereas our trans kinda feathers it out a bit.
good explanation thank you! I'm also told by the MB master tech at the dealer who services my 63 that the Race Start is a safer option on the Trans (based on what you explained above) but does not produce as strong of a launch as the brake boost method....
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Old Apr 13, 2020 | 07:32 PM
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I had read somewhere the oil needs to be at temp before RS. Or maybe that was just a “best practice”?
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Old Apr 13, 2020 | 07:41 PM
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Originally Posted by NoVAe63s
I had read somewhere the oil needs to be at temp before RS. Or maybe that was just a “best practice”?
That's correct according to the manual.
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Old Apr 13, 2020 | 09:16 PM
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Originally Posted by NoVAe63s
I had read somewhere the oil needs to be at temp before RS. Or maybe that was just a “best practice”?
Correct; you’ll get a message advising Race Start is unavailable if trying to activate it while the oil/water temp is too low.
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Old Apr 13, 2020 | 11:01 PM
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Mine sometimes doesn't work, and I'm not sure why. Maybe it's the brake pedal pressure thing that was noted. I don't purposefully hold it extra hard down, just enough for it not to roll off.
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Old Apr 14, 2020 | 09:52 PM
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I have extensively tried both RS and brake boosting. Here is what consistently gets me the best times 0-60 at 3.0 ! (yes, I have an EC tune stage II) and it is NOT RS:

Traction completely off
suspension in C (you want the car to squat and load the rear tires more)
AC off (yes, in theory it is supposed to shutdown at WOT)
S+ performance mode
Brake boost to about 3k ( there is a feel and technique to master this. A bit of hit and miss. Sometimes it will want to stall out.. Need to catch it just right on the way up)
Of course peddle floored
release brake quickly while gas is smashed and keep it smashed.
do your run on a verified flat nice roadway. Use an altimiter to verify no incline or decline.
No windows or sunroof open
Keep steering and car as completely straight as possible. The slightest corrections cost 100ths.

Doing this with my Stage II Eurocharged tune + my UPD cold air intake consistently gets me 3.2 or better. When I pull my 75 pound sub out of my trunk I get can achieve the 3.0 !!!! 0-100 in 7.1 and 1/4 in 11.1

Hope this helps guys.

Cheers


Last edited by Vrodman; Apr 16, 2020 at 02:14 PM.
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