Brake Launch
04-06-2005, 05:12 PM
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I have seen mulitple references to brake launch (not the assist thing on SMG cars). Is this a programmed feature in the e60 or is it simply a driving technique that you can do in any vehicle?
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off. This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off. This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
04-06-2005, 05:35 PM
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Sounds like it's not good for the car.
04-06-2005, 08:19 PM
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Right, either some clutch slipping or transmission shock will happen on a braking launch. I completely destroyed first gear on a 1949 Ford years ago by popping the clutch, but beat the heck out of 1951 Fordamatic before I did it. 
04-06-2005, 08:45 PM
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This is a common/standard way to launch a car with an automatic transmission when drag racing. Most, if not all, car magazines use this technique when they gather 0-60, and 1/4 mile statistics in car reviews. It is usually explained in the fine print of the articles. Drag racing Funny Cars, rails etc. all use this technique. You can actually spin the rear tires while the front brakes hold the car in place. You need to carefully modulate the brakes so that the front wheels hold the car in place but the rear wheels are allowed to spin. It is somewhat hard on the drive train, but not terribly bad. It is probably not any worse than the SMG launch that pops the clutch at relatively high RPM. In the 5 series, you must disable DSC/DTC in order to do this or the computer will limit the throttle. I've done it with my 545 and it is no big deal and I got a nice burnout. The guy who ran the California smog check on my ED did it on the dyno portion of the test.
04-07-2005, 02:59 AM
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My Ride: 2005 545i, Black on black. 6spd MT, Nav, sports package.
It's called brake torquing. It is bad for the engine mounts, and it wears the brake system.
I wouldnt do it on any e60. It's something you'd do on a loaner car.
I wouldnt do it on any e60. It's something you'd do on a loaner car.
04-07-2005, 12:29 PM
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My Ride: 2004 545i - 6 speed manual (July 04 build), silver-grey/black, sports package std equipment (18", active roll, active steering, adaptive headlights), premium sound, bluetooth enabled, folding rear seat, lumbar, 3m hood/bumper protective film, rear tint, euro reflectors.
Originally Posted by derrickj' date='Apr 6 2005, 05:12 PM
I have seen mulitple references to brake launch (not the assist thing on SMG cars).? Is this a programmed feature in the e60 or is it simply a driving technique that you can do in any vehicle?
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
[snapback]112222[/snapback]
I take it your wife does not read this forum.
04-07-2005, 04:10 PM
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My Ride: 2004 Silver Gray 545i, Sport, Navigation, Steptronic, PDC, Windowshade, Bluetooth Paired with Treo 650, Huper Optik tint, Euro reflectors, Poplar Wood Gear Shift, Poplar Wood Console Cover
Originally Posted by jsal' date='Apr 7 2005, 03:29 PM
[quote name='derrickj' date='Apr 6 2005, 05:12 PM']I have seen mulitple references to brake launch (not the assist thing on SMG cars).? Is this a programmed feature in the e60 or is it simply a driving technique that you can do in any vehicle?
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
[snapback]112222[/snapback]
I take it your wife does not read this forum.
[snapback]112494[/snapback]
[/quote]Thankfully not! I am all tough when I know I am not going to get caught.
04-07-2005, 04:48 PM
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Originally Posted by derrickj' date='Apr 6 2005, 08:12 PM
I have seen mulitple references to brake launch (not the assist thing on SMG cars).? Is this a programmed feature in the e60 or is it simply a driving technique that you can do in any vehicle?
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
My understanding is you put on foot on the brake and on foot on the acclerator and accelerator to about 2500rpm's, let off and take off.? This is an intentional one foot on the brake and the other on the accelerator, not accidental as in the way my wife drives.
[snapback]112222[/snapback]
If your 545i is 8/04 production shoudn't it really be an early 2005?
I thought production ends in late July and the Plant is closed for vacation the Month of August.
04-07-2005, 06:36 PM
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My Ride: Now Driving a Freakin' Prius!
Was...
2004 545i | SMG | White/Black | Sport | NAV | Logic 7 | PDC | Fold-down Seats | Adaptive Headlights | Cold Weather Pkg | Clear-again Bra | Mud Flaps | Bluetooth | Coat Hangar | Aux Input | All Weather Mats | 18"X8.5" BBS RK w/ Michelin Pilot Alpin's (winter) | New steering rack @ 1.2K & 17K miles| Software V.19.1 | B&B Exhaust (vrrrroooooommm!) <---Click.
I've used this technique on many cars with automatic transmissons but I never thought to try it with my SMG. Accelleration Assist is basically worthless unless you've got some relatively new tread and there is really no way to modulate the clutch upon launch.
Has anyone tried this on an SMG? Does it work? As I think about it I can smell a burning clutch. Am I wrong?
Has anyone tried this on an SMG? Does it work? As I think about it I can smell a burning clutch. Am I wrong?