How to launch an AT?

triggz · 03-23-2012, 02:17 PM

Hey guys,

Just curious as I am hitting up the 1/4 mile soon for the first time.

My buddy just got a 2012 C63 Coupe Performance Pack and he wants to run me on the strip.

I understand you have to brake-boost in 2nd gear up to 2000rpm.

My question is, do you use the kickdown feature or not?

I find the car feels faster when I use the kickdown off a roll. For example being in 4th gear and using the kickdown usually puts me in either 2-3 and the rpms jump real fast. However, when I just floor it (before the kickdown) in 3rd, it doesn't have that instant "jump" effect, as it's more of a buildup.

Please advise,

Thanks

themyst · 03-23-2012, 02:31 PM

Quote:

Originally Posted by triggz

Hey guys,

Just curious as I am hitting up the 1/4 mile soon for the first time.

My buddy just got a 2012 C63 Coupe Performance Pack and he wants to run me on the strip.

I understand you have to brake-boost in 2nd gear up to 2000rpm.

My question is, do you use the kickdown feature or not?

I find the car feels faster when I use the kickdown off a roll. For example being in 4th gear and using the kickdown usually puts me in either 2-3 and the rpms jump real fast. However, when I just floor it (before the kickdown) in 3rd, it doesn't have that instant "jump" effect, as it's more of a buildup.

Please advise,

Thanks

I'm no pro but I don't use the Kickdown. Need to modulate throttle a bit off the line on street tires.

Longboarder · 03-23-2012, 02:39 PM

Kickdown in that situation would be a bad thing. I'm guessing you can't get traction in first gear at all if you don't have an LSD and decent tires. Yes brake boosting in second gear is a good idea but even at 2,000 RPM you may spin...as it all depends on the track prep. If it's real sticky, you may be ok.

And let us know what you do and how it works out. We're all hoping you can take the C63

dlbrooks18 · 03-23-2012, 02:40 PM

Nice mods you have.. yeah you can put it in 2nd and brake boost to about 2-2500 and ease in to it and shift your self or just put in DS and brake boost the same.. as stated above modulate the throttle a bit on launch then get your foot in it.. report back and let us know how you do!

idrift4wd · 03-23-2012, 02:59 PM

with your set-up. Brake torque 2nd (2k-3k)build a little boost. press the peddle all the way down WITHOUT pressing kickdown button. Wait until around 40-50 stomp gas, pressing the kickdown button. (it will keep in second gear and switch to third by it self.) But you can pick your shift point, people say around 6200 rpm, but some just let it run to redline

trick is not to downshift to first. If your going less then 30-35 its going to shift down to first from a 2nd gear launch. Or if your tires are stickier enough, 1st gear brakeboost, floor it with kickdown.

iBoost · 03-23-2012, 03:31 PM

If you brake boost in second and try to use the kick-down right away you'll have a really slow launch. The car will downshift to 1st.. Brake boost to about 2k and then keep the pedal right before the kick-down.. Good luck on the run!

triggz · 03-23-2012, 03:38 PM

Thanks for your help guys!

I will report back with the results and hopefully some video footage

He literally just picked up the ride a few weeks ago and he mentioned it comes stock with LSD.

My tires are Hankook V12 Evo (from what ive heard they arent the greatest from a dig)

themyst · 03-23-2012, 03:42 PM

Quote:

Originally Posted by triggz

Thanks for your help guys!

I will report back with the results and hopefully some video footage

He literally just picked up the ride a few weeks ago and he mentioned it comes stock with LSD.

My tires are Hankook V12 Evo (from what ive heard they arent the greatest from a dig)

Yes, your tires are total garbage. Sorry to say but true.

triggz · 03-23-2012, 03:43 PM

Quote:

Originally Posted by themyst

Yes, your tires are total garbage. Sorry to say but true.

*sigh* I know. I'm waiting for them to be done so I can grab a set of Nittos.

cupertinosteve · 03-23-2012, 04:08 PM

FYI - the kickdown won't happen when you're over 4800 RPM. Its not based on the speed you're driving but the RPMs you're at (test it on the highway).

themyst · 03-23-2012, 04:12 PM

Quote:

Originally Posted by cupertinosteve

FYI - the kickdown won't happen when you're over 4800 RPM. Its not based on the speed you're driving but the RPMs you're at (test it on the highway).

I've accidentally hit the kick down at the track short shifting the 3-4 at 6200 RPM and ruined runs before.

themyst · 03-23-2012, 04:13 PM

Quote:

Originally Posted by triggz

*sigh* I know. I'm waiting for them to be done so I can grab a set of Nittos.

If he has a p31 he will likely outtrap you a little bit. Lucky you can launch in 2nd though.... He can't so he may spin badly.

enrita · 03-23-2012, 04:18 PM

Brakeboost 2500-3000 rpm m2

Stucks · 03-23-2012, 05:09 PM

Quote:

Originally Posted by triggz

*sigh* I know. I'm waiting for them to be done so I can grab a set of Nittos.

NT05's hook pretty well. They are one of the closest things you can get that are like a drag radial, but still classified as a street tire.

RnmEvo9 · 03-23-2012, 05:16 PM

How are you guys brake boosting in 2nd up to 2500 and not spinning? I need to modulate the throttle off idle in 2nd gear to get any decent traction. I am using RFT's though, so that may be the culprit even though they are practically new.

marv85 · 03-23-2012, 05:26 PM

Quote:

Originally Posted by RnmEvo9

How are you guys brake boosting in 2nd up to 2500 and not spinning? I need to modulate the throttle off idle in 2nd gear to get any decent traction. I am using RFT's though, so that may be the culprit even though they are practically new.

RFT suck! I had issues with them even on stock map! and they were practically new. They just can't take the beating. I love my nitto's!

03-23-2012, 02:17 PM	#1
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	How to launch an AT? Hey guys, Just curious as I am hitting up the 1/4 mile soon for the first time. My buddy just got a 2012 C63 Coupe Performance Pack and he wants to run me on the strip. I understand you have to brake-boost in 2nd gear up to 2000rpm. My question is, do you use the kickdown feature or not? I find the car feels faster when I use the kickdown off a roll. For example being in 4th gear and using the kickdown usually puts me in either 2-3 and the rpms jump real fast. However, when I just floor it (before the kickdown) in 3rd, it doesn't have that instant "jump" effect, as it's more of a buildup. Please advise, Thanks
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03-23-2012, 02:39 PM	#3
Longboarder Major General 3431 Rep 6,771 Posts Drives: 2016 BMW i8 Join Date: Dec 2006 Location: Monarch Beach iTrader: (1) Garage List 2012 BMW e92 M3 [0.00] 2021 BMW X5M [10.00] 2015 Porsche 991 Tu ... [10.00] 2015 Porsche 991 GT3 [10.00]	Kickdown in that situation would be a bad thing. I'm guessing you can't get traction in first gear at all if you don't have an LSD and decent tires. Yes brake boosting in second gear is a good idea but even at 2,000 RPM you may spin...as it all depends on the track prep. If it's real sticky, you may be ok. And let us know what you do and how it works out. We're all hoping you can take the C63 __________________ Current BMWs: 2022 X5 40i, 2016 X5 50i 2015 Porsche 991 Turbo S 1979 Porsche 911 Turbo (930) a couple others IG: longboarder949; YouTube: https://www.youtube.com/channel/UCT1...eoFBszPIK0gf9w
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03-23-2012, 02:40 PM	#4
dlbrooks18 Brigadier General 161 Rep 3,736 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	Nice mods you have.. yeah you can put it in 2nd and brake boost to about 2-2500 and ease in to it and shift your self or just put in DS and brake boost the same.. as stated above modulate the throttle a bit on launch then get your foot in it.. report back and let us know how you do! __________________ 2008 E90 335
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03-23-2012, 02:59 PM	#5
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	with your set-up. Brake torque 2nd (2k-3k)build a little boost. press the peddle all the way down WITHOUT pressing kickdown button. Wait until around 40-50 stomp gas, pressing the kickdown button. (it will keep in second gear and switch to third by it self.) But you can pick your shift point, people say around 6200 rpm, but some just let it run to redline trick is not to downshift to first. If your going less then 30-35 its going to shift down to first from a 2nd gear launch. Or if your tires are stickier enough, 1st gear brakeboost, floor it with kickdown.
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03-23-2012, 03:31 PM	#6
iBoost Retired e90post Member 135 Rep 3,038 Posts Drives: real slow Join Date: Nov 2009 Location: Las Vegas iTrader: (13)	If you brake boost in second and try to use the kick-down right away you'll have a really slow launch. The car will downshift to 1st.. Brake boost to about 2k and then keep the pedal right before the kick-down.. Good luck on the run!
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03-23-2012, 03:38 PM	#7
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	Thanks for your help guys! I will report back with the results and hopefully some video footage He literally just picked up the ride a few weeks ago and he mentioned it comes stock with LSD. My tires are Hankook V12 Evo (from what ive heard they arent the greatest from a dig)
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03-23-2012, 04:08 PM	#10
cupertinosteve Second Lieutenant 16 Rep 227 Posts Drives: BMW 335i Join Date: Nov 2011 Location: Cupertino, Duh? iTrader: (0)	FYI - the kickdown won't happen when you're over 4800 RPM. Its not based on the speed you're driving but the RPMs you're at (test it on the highway).
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03-23-2012, 04:18 PM	#13
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Brakeboost 2500-3000 rpm m2 __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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03-23-2012, 05:16 PM	#15
RnmEvo9 Banned 247 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	How are you guys brake boosting in 2nd up to 2500 and not spinning? I need to modulate the throttle off idle in 2nd gear to get any decent traction. I am using RFT's though, so that may be the culprit even though they are practically new.
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