Best Launch Procedure?

MRSSIIM3 · 09-03-2014, 02:03 AM

Hey guys,

I'm wondering what the best way to launch our M4s is. I've tried it with MDM but TC kicks in at around 6k rpm in 1st then during the 1-2 upshift. With DSC off, i have to feather the throttle at launch to keep the tires from spinning but same thing as with MDM, my 1-2 shift gives a lot of wheelspin and its sliding. Haven't tried with LC yet but there has to be a way to launch it well without LC.

What have you guys found so far? I did a few V-Box runs and I keep getting 0-60 in 4.2. Not sure how BMW is claiming 3.9...

On the plus side, my VBox read 1/4 mile in 11.82 @ 122.3mph with a 60-130 of 9.38. Car is stock and on 91 pump gas.

Jim300186 · 09-03-2014, 02:06 AM

Eh, the launch control. The 3.9 is for the dct models you a manual?

MRSSIIM3 · 09-03-2014, 02:14 AM

Quote:

Originally Posted by Jim300186

Eh, the launch control. The 3.9 is for the dct models you a manual?

No I'm DCT. Don't really want to use launch control that much to avoid excessive clutch wear. I guess thats the only way though..

Jim300186 · 09-03-2014, 02:20 AM

Yes and from what I have read and heard from bmw techs the clutch wear on the dct's when using launch is very limited not like the smg days lol

CanAutM3 · 09-03-2014, 02:26 AM

Wow, you got an 11.82 ET without using launch control. That is pretty impressive.

MRSSIIM3 · 09-03-2014, 02:33 AM

Quote:

Originally Posted by CanAutM3

Wow, you got an 11.82 ET without using launch control. That is pretty impressive.

Makes me wonder what it would be with LC...11.5??

CanAutM3 · 09-03-2014, 02:40 AM

Quote:

Originally Posted by MRSSIIM3

Makes me wonder what it would be with LC...11.5??

Are you sure the road is level?

Have you tried it in both directions?

MRSSIIM3 · 09-03-2014, 02:43 AM

Quote:

Originally Posted by CanAutM3

Are you sure the road is level?

Have you tried it in both directions?

Yes. Tried it several times with several combinations. Best times were 11.99 (opposite direction), 11.83 (normal direction), 11.82 (normal direction). The variation was in the launch. 11.99 was with MDM on intervening in 1st. 0-60 time was around 4.5 in that run

MWS55 · 09-03-2014, 03:15 AM

How much on your odometer so far ?

tooch · 09-03-2014, 03:17 AM

Thats a good time

MRSSIIM3 · 09-03-2014, 03:18 AM

Quote:

Originally Posted by tooch

Thats a good time

BMW claims a 0-60 of 3.9 though...im getting 4.2 best case

launching the e92 was way easier IMO

tooch · 09-03-2014, 03:24 AM

Quote:

Originally Posted by MRSSIIM3

BMW claims a 0-60 of 3.9 though...im getting 4.2 best case

launching the e92 was way easier IMO

I'd take that off set if it gave us a lower 1/4 mile time

nasdaq100 · 09-03-2014, 03:43 AM

Hi guys,

For my part:
DSC on : 4,7
MDM : 4,5
DSC off: 4,2
LC : 3,9 (just one time, other than that 4,00~4,1)

Just one thing, I have found some differences with the tires temperatures, I did my best time when they were over 32 °C (89,6°F) alone in the car and with just a few gas.

Sir Loin · 09-03-2014, 10:36 PM

Quote:

Originally Posted by nasdaq100

Hi guys,

For my part:
DSC on : 4,7
MDM : 4,5
DSC off: 4,2
LC : 3,9 (just one time, other than that 4,00~4,1)

Just one thing, I have found some differences with the tires temperatures, I did my best time when they were over 32 °C (89,6°F) alone in the car and with just a few gas.

0-60 mph or 0-100 kmph?

tcpsoft · 09-03-2014, 10:55 PM

I've only tried LC two or maybe three times. Every time, it starts out great in first gear, then it seems the LC system gets excited and forgets to do its job because it goes into smokey burnout after the first 2 seconds or so.

I think the trick will be to start in LC, then feather once it gets into the non-LC gears. I've found at the track that feathering the throttle gets better acceleration out of a corner than non-Euro MDM.

nasdaq100 · 09-04-2014, 01:38 AM

Quote:

Originally Posted by Sir Loin

0-60 mph or 0-100 kmph?

0-100 kmph

CanAutM3 · 09-04-2014, 07:08 AM

Do you shift manually or do you let the car shift for itself?

If you shift manually, it dissengages Launch Control and you are on your own to manage traction.

The same goes for the throttle, if you lift slightly during the run to disengage the kickdown button, LC dissengages.

babyboss · 06-05-2015, 04:35 PM

tried various modes .. D with mdm / LC traction off / drive off from idle
best 1/4m I could get was 12.8 / 13.0 - that's terrible ..
car was spinning battling to get traction ..

so how do I get early 12'S ??

09-03-2014, 02:03 AM	#1
MRSSIIM3 General 148 Rep 1,348 Posts Drives: M4 SO Join Date: Apr 2009 Location: NY iTrader: (5)	Best Launch Procedure? Hey guys, I'm wondering what the best way to launch our M4s is. I've tried it with MDM but TC kicks in at around 6k rpm in 1st then during the 1-2 upshift. With DSC off, i have to feather the throttle at launch to keep the tires from spinning but same thing as with MDM, my 1-2 shift gives a lot of wheelspin and its sliding. Haven't tried with LC yet but there has to be a way to launch it well without LC. What have you guys found so far? I did a few V-Box runs and I keep getting 0-60 in 4.2. Not sure how BMW is claiming 3.9... On the plus side, my VBox read 1/4 mile in 11.82 @ 122.3mph with a 60-130 of 9.38. Car is stock and on 91 pump gas.
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09-03-2014, 02:06 AM	#2
Jim300186 Private First Class 39 Rep 173 Posts Drives: Bmw m4 Join Date: Aug 2014 Location: Scotland iTrader: (0)	Eh, the launch control. The 3.9 is for the dct models you a manual?
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09-03-2014, 02:20 AM	#4
Jim300186 Private First Class 39 Rep 173 Posts Drives: Bmw m4 Join Date: Aug 2014 Location: Scotland iTrader: (0)	Yes and from what I have read and heard from bmw techs the clutch wear on the dct's when using launch is very limited not like the smg days lol
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09-03-2014, 02:26 AM	#5
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Wow, you got an 11.82 ET without using launch control. That is pretty impressive.
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09-03-2014, 03:15 AM	#9
MWS55 Private First Class 26 Rep 116 Posts Drives: MW/SO M4 Join Date: Apr 2014 Location: Unknown iTrader: (0)	How much on your odometer so far ?
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09-03-2014, 03:17 AM	#10
tooch Captain 112 Rep 806 Posts Drives: F82 Join Date: Jul 2007 Location: NOR-CAL iTrader: (0)	Thats a good time __________________ 96 E31 JB 07 E92 AW F82 BSM
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09-03-2014, 03:43 AM	#13
nasdaq100 Second Lieutenant 66 Rep 204 Posts Drives: BMW M4 DKG Join Date: Mar 2014 Location: France iTrader: (0)	Hi guys, For my part: DSC on : 4,7 MDM : 4,5 DSC off: 4,2 LC : 3,9 (just one time, other than that 4,00~4,1) Just one thing, I have found some differences with the tires temperatures, I did my best time when they were over 32 °C (89,6°F) alone in the car and with just a few gas.
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09-03-2014, 10:55 PM	#15
tcpsoft Private First Class 94 Rep 158 Posts Drives: F80 M3 Join Date: Jun 2007 Location: Greensboro, NC iTrader: (0) Garage List 2015 BMW [0.00]	I've only tried LC two or maybe three times. Every time, it starts out great in first gear, then it seems the LC system gets excited and forgets to do its job because it goes into smokey burnout after the first 2 seconds or so. I think the trick will be to start in LC, then feather once it gets into the non-LC gears. I've found at the track that feathering the throttle gets better acceleration out of a corner than non-Euro MDM. __________________ 2015 M3 DCT (sold) 2008 Lotus Exige S240 - too many mods to list (sold) 2007 Lotus Exige S (RIP) 2006 MINI Cooper S (sold)
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09-04-2014, 07:08 AM	#17
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Do you shift manually or do you let the car shift for itself? If you shift manually, it dissengages Launch Control and you are on your own to manage traction. The same goes for the throttle, if you lift slightly during the run to disengage the kickdown button, LC dissengages.
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06-05-2015, 04:35 PM	#18
babyboss Lieutenant 74 Rep 554 Posts Drives: 640d Msport Join Date: Jun 2010 Location: centurion iTrader: (0) Garage List 2012 640d [0.00]	tried various modes .. D with mdm / LC traction off / drive off from idle best 1/4m I could get was 12.8 / 13.0 - that's terrible .. car was spinning battling to get traction .. so how do I get early 12'S ??
	Appreciate 0 Quote