E90 335i - Auto - 2nd Gear Launch

drew4392 · 05-03-2011, 09:28 AM

This is my first Auto, and having difficulty with launching it.

Only mod is a JB4 tune.

From what I read, 2nd gear launch (sport mode, change to 2M) is supposed to yield a bit of wheel spin. When doing this, I brake stand and bring revs to ~2k, and simultaneously release brake and smash gas. Yes, there is a little jump, but no wheel spin.

One thing I noticed when doing this: As the RPMs grew, it seemed like the engine was bogging. The RPM increase wasn't smooth-- when I would like 1400 RPM, it would drop a little, so I would need to press gas harder. Same thing at 1600 and 1800 RPM. Perhaps the brakes are slipping, thus relieving some engine pressure?

Any ideas? How deep into the accelerator am I supposed to be when holding down the brakes? Am I supposed to be releasing brake and mashing gas at the same time?

Thanks!

gos · 05-03-2011, 09:40 AM

Quote:

Originally Posted by drew4392

I brake stand and bring revs to ~2k, and simultaneously release brake and smash gas

Floor it first, release the brakes as you feel the car start to break free.

clean3 · 05-03-2011, 12:00 PM

turn off dtc

gtenedio · 05-03-2011, 12:43 PM

Press and hold traction button for 3-4 seconds..then try it

sexymexy · 05-03-2011, 12:46 PM

To get full power of the Engine you need to hold the DTC button like five seconds longer After you press it for the first time then the cluster will show you a new icon... Now you got the POWER!!!

Syndicategt · 05-03-2011, 01:13 PM

This should be posted in the racing section (Track, Autocross, ect...).

idrift4wd · 05-03-2011, 01:27 PM

you need more power to get a nice 2nd gear launch.

2nd gear is a larger gear, so 1st gear might be better for you and let it automatically shift to second. the engine must spin the gear and will not get full power until the higer rpms, so the bogging is really the engine trying to gain power with the larger 2nd gear.

drew4392 · 05-03-2011, 01:47 PM

Traction control is off completely. 1st is useless as too much spin, so I thought a 2nd gear launch was widely regarded as the proper way to launch these things..?

Notion-Za · 05-03-2011, 02:04 PM

2nd gear is the right way!

I build the car up to 2500rpm in 2nd gear. You really have to hold the brake down hard.
the 500rpm makes a big difference. Make sure as soon as you release the brake you put your foot flat but don't push down hard enough to active kick down mode

It's not that good for the car so i seldom do it but torque braking does give you the best launch.

drew4392 · 05-03-2011, 03:23 PM

@notion: thanks for clarifying!

05-03-2011, 09:28 AM	#1
drew4392 Second Lieutenant 51 Rep 238 Posts Drives: '07 335i Sedan Join Date: May 2010 Location: Los Angeles iTrader: (1)	E90 335i - Auto - 2nd Gear Launch - How to? This is my first Auto, and having difficulty with launching it. Only mod is a JB4 tune. From what I read, 2nd gear launch (sport mode, change to 2M) is supposed to yield a bit of wheel spin. When doing this, I brake stand and bring revs to ~2k, and simultaneously release brake and smash gas. Yes, there is a little jump, but no wheel spin. One thing I noticed when doing this: As the RPMs grew, it seemed like the engine was bogging. The RPM increase wasn't smooth-- when I would like 1400 RPM, it would drop a little, so I would need to press gas harder. Same thing at 1600 and 1800 RPM. Perhaps the brakes are slipping, thus relieving some engine pressure? Any ideas? How deep into the accelerator am I supposed to be when holding down the brakes? Am I supposed to be releasing brake and mashing gas at the same time? Thanks!
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05-03-2011, 12:00 PM	#3
clean3 I just had sex. 52 Rep 559 Posts Drives: e90 328i Join Date: Oct 2010 Location: GA iTrader: (1)	turn off dtc
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05-03-2011, 12:43 PM	#4
gtenedio Major 348 Rep 1,237 Posts Drives: '%E2%80%9909 e92 m3, '19 X3, % Join Date: Apr 2011 Location: nyc iTrader: (1)	Press and hold traction button for 3-4 seconds..then try it __________________ .
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05-03-2011, 12:46 PM	#5
sexymexy Second Lieutenant 4 Rep 219 Posts Drives: 2006 e90 jet black Join Date: Apr 2009 Location: Tx iTrader: (1)	To get full power of the Engine you need to hold the DTC button like five seconds longer After you press it for the first time then the cluster will show you a new icon... Now you got the POWER!!!
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05-03-2011, 01:13 PM	#6
Syndicategt Brigadier General 155 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	This should be posted in the racing section (Track, Autocross, ect...). __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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05-03-2011, 01:27 PM	#7
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]	you need more power to get a nice 2nd gear launch. 2nd gear is a larger gear, so 1st gear might be better for you and let it automatically shift to second. the engine must spin the gear and will not get full power until the higer rpms, so the bogging is really the engine trying to gain power with the larger 2nd gear.
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05-03-2011, 01:47 PM	#8
drew4392 Second Lieutenant 51 Rep 238 Posts Drives: '07 335i Sedan Join Date: May 2010 Location: Los Angeles iTrader: (1)	Traction control is off completely. 1st is useless as too much spin, so I thought a 2nd gear launch was widely regarded as the proper way to launch these things..?
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05-03-2011, 02:04 PM	#9
Notion-Za Second Lieutenant 28 Rep 293 Posts Drives: '16 M4 ZCP Join Date: Sep 2008 Location: South Africa iTrader: (0)	2nd gear is the right way! I build the car up to 2500rpm in 2nd gear. You really have to hold the brake down hard. the 500rpm makes a big difference. Make sure as soon as you release the brake you put your foot flat but don't push down hard enough to active kick down mode It's not that good for the car so i seldom do it but torque braking does give you the best launch. __________________ 2016 M4 ZCP 2018 Ford Ranger WildTrak 3.2
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05-03-2011, 03:23 PM	#10
drew4392 Second Lieutenant 51 Rep 238 Posts Drives: '07 335i Sedan Join Date: May 2010 Location: Los Angeles iTrader: (1)	@notion: thanks for clarifying!
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