At Start At 1/4 Mile?

AKG · 11-09-2011, 12:12 PM

Going to the track this weekend... which have you seen is better, starting in 2nd gear or 1st???
Thanks.

cn555ic · 11-09-2011, 12:30 PM

Most AT that are record holders start off on 2nd gear

335Power · 11-09-2011, 12:30 PM

I have seen people have success with 2nd gear launches in automatic cars however if you have a manual car you will want to start in 1st.

Brey335i · 11-09-2011, 12:32 PM

For consistency, 2nd. But my fastest passes are in 1st

StartupJunkie · 11-09-2011, 02:22 PM

if you have drag tire setup and can heat them up ... 1st gear.

if you have a street tire setup, 2nd gear.

Junk

Dr. G · 11-09-2011, 03:36 PM

Quote:

Originally Posted by StartupJunkie

if you have drag tire setup and can heat them up ... 1st gear.

if you have a street tire setup, 2nd gear.

Junk

Exactlyyyy

Longboarder · 11-09-2011, 03:55 PM

What chip do you have? Some like the Proceed have traction control features that enable first gear launches, even with 400+ RWHP. The chip reduces torque at the milisecond level to enable traction, which works much differently than the factory DTC which applies the brakes and slows you down. I launch in 1st but short shift at around 3,500 RPM into 2nd for the best results on my car.

creaminz · 11-09-2011, 04:58 PM

At 1st, do you press down the kick down button?

Longboarder · 11-09-2011, 07:04 PM

Quote:

Originally Posted by creaminz

At 1st, do you press down the kick down button?

If you are asking me (vs the OP), I do not. In fact, I probably push the pedal 3/4 of the way down to get the best launch, and manually short shift on the paddle shifters around 3,500/4,000 rpm.

AKG · 11-10-2011, 12:11 PM

Thanks all, will let you know what worked best!

Syndicategt · 11-10-2011, 12:27 PM

Brake boost and launch in 2nd for most consistant runs. You will also have 1 less gear to shift into when launching in 2nd. Hotrod did some testing - 1st gear launch = better 0-60. 2nd gear launch = better 1/4 mile.

Quote:

Originally Posted by creaminz

At 1st, do you press down the kick down button?

If you are flooring it in 1st....you are just going to sit there and spin. Anything more than 1/2 throttle is almost too much in 1st.

triggz · 11-10-2011, 12:28 PM

do you guys ever use the kickdown? I find when you don't kickdown you don't get full boost

Syndicategt · 11-10-2011, 12:31 PM

Quote:

Originally Posted by triggz

do you guys ever use the kickdown? I find when you don't kickdown you don't get full boost

I have my kickdown switch "disabled". I beleive 78% throttle position = 100% throttle.

Wedge1967 · 11-10-2011, 02:44 PM

If you read the other threads about making a spacer to put under the peddle, don't bother. The peddle has a ball and socket connection on the shaft, just pull on it and it will come out. Then you can put rubber washers or spacers over the shaft. Then snap the ball and socket back together and test it. You may need to add more to get it shimmed out, but it makes a world of differance. Nothing worse than a hard pull in 3rd only to have it kick down to 2nd with over 400 rwhp. Try that some day while turning a corner and see how quick you can get out of it. LOL

Once you have it so it doesn't kick down, hook your laptop up and log some data to make sure your able to get to WOT. BTW, your AT will still kick down in D or DS, but in M it will not.

Have fun.

11-09-2011, 12:12 PM	#1
AKG Enlisted Member 9 Rep 31 Posts Drives: BMW 335i Sedan Join Date: Jul 2011 Location: Guatemala iTrader: (0)	At Start At 1/4 Mile? Going to the track this weekend... which have you seen is better, starting in 2nd gear or 1st??? Thanks. __________________ Mods: JB4 G5 / Dinan Stage 2, Intake, AFE scoops, DP´s, Dinan oil cooler.
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11-09-2011, 12:30 PM	#2
cn555ic 442 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	Most AT that are record holders start off on 2nd gear
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11-09-2011, 12:30 PM	#3
335Power Captain 37 Rep 742 Posts Drives: B8.5 S4, F30 328i Join Date: Nov 2010 Location: PA iTrader: (11)	I have seen people have success with 2nd gear launches in automatic cars however if you have a manual car you will want to start in 1st.
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11-09-2011, 12:32 PM	#4
Brey335i Banned 113 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	For consistency, 2nd. But my fastest passes are in 1st
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11-09-2011, 02:22 PM	#5
StartupJunkie First Lieutenant 30 Rep 314 Posts Drives: 07 BMW 335i Sedan+2 Baby Seats Join Date: Feb 2009 Location: SF South Bay Area, CA iTrader: (0)	if you have drag tire setup and can heat them up ... 1st gear. if you have a street tire setup, 2nd gear. Junk __________________ 11.535@124.423mph (1.641 60') - AutoTune 7-27, Race+Meth, Best ET w/ only 80% throttle 1st and 2nd 11.647@121.356mph (1.590 60') - AutoTune (beta pre-5-15), Race Gas, No METH Perf Mods: Vishnu PROcede Rev3 v5, Vishnu PWM Meth Kit, AR Design DPs, AE Exhaust, Helix FMIC, Vishnu DCI, Forge DV, WaveTrac LSD (Best Trap - 124.665mph)
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11-09-2011, 03:55 PM	#7
Longboarder Major General 3437 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]	What chip do you have? Some like the Proceed have traction control features that enable first gear launches, even with 400+ RWHP. The chip reduces torque at the milisecond level to enable traction, which works much differently than the factory DTC which applies the brakes and slows you down. I launch in 1st but short shift at around 3,500 RPM into 2nd for the best results on my car. __________________ 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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11-09-2011, 04:58 PM	#8
creaminz Major General 549 Rep 7,705 Posts Drives: E90 LCI Join Date: Sep 2005 Location: So. Cal iTrader: (33)	At 1st, do you press down the kick down button?
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11-10-2011, 12:11 PM	#10
AKG Enlisted Member 9 Rep 31 Posts Drives: BMW 335i Sedan Join Date: Jul 2011 Location: Guatemala iTrader: (0)	Thanks all, will let you know what worked best! __________________ Mods: JB4 G5 / Dinan Stage 2, Intake, AFE scoops, DP´s, Dinan oil cooler.
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11-10-2011, 12:28 PM	#12
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	do you guys ever use the kickdown? I find when you don't kickdown you don't get full boost
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11-10-2011, 02:44 PM	#14
Wedge1967 Banned 125 Rep 2,172 Posts Drives: '07 e92 AT Sport Montego Blue Join Date: Sep 2011 Location: Portland, OR iTrader: (3)	If you read the other threads about making a spacer to put under the peddle, don't bother. The peddle has a ball and socket connection on the shaft, just pull on it and it will come out. Then you can put rubber washers or spacers over the shaft. Then snap the ball and socket back together and test it. You may need to add more to get it shimmed out, but it makes a world of differance. Nothing worse than a hard pull in 3rd only to have it kick down to 2nd with over 400 rwhp. Try that some day while turning a corner and see how quick you can get out of it. LOL Once you have it so it doesn't kick down, hook your laptop up and log some data to make sure your able to get to WOT. BTW, your AT will still kick down in D or DS, but in M it will not. Have fun.
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