Loss of power when turning DSC off help

[Butters03]

So tonight I experienced a odd situation.

2012 135. DCT with cat back, are intake and PPk stage 1.

When normal driving in sport or sport plus mode when I deliberately turn off the DSC partially or entirely off I notice an obvious reduction in power. Essentially its behaving like it's turning sport mode off.

To better try to explain this... We all know that say traveling at a steady speed of say 60 and turning sport mode ON there is a noticeable boost in power / acceleration. Well when I turn the traction modes off I feel the same effect except in reverse. Subsequently when I am in sport / sport plus mode and the DSC is off and turn sport mode on/off there no longer a power change. So it's almost as if it's turning sport mode off.

Is this normal? I don't like the idea of not having all of the available power just because the nannies are off. It seems counter intuitive especially if say you wanted to use launch control

Any input would be appreciated.

[The Wind Breezes]

lololol

You DO have all the power, silly, DSC off just removes the sport pedal remap to make the pedal easier to modulate. It's 100% not an issue in the slightest. If you're asking this question and you can't tell you have the same amount of power I recommend NOT driving the car with DSC off or you'll get in over your head very fast if you're driving hard.Sport engaged with DSC off will keep your shifts happening super fast which is the only important thing sport actually does besides open a valve in your muffler for more of that sound.

[Butters03]

Thanks for the info. I've had the car a little over s year and rarely drive like an idiot so im not fully familiar with the details of the traction system when off. All I noticed was a difference.

My last car that had decent power was a 330hp second gen mr2. No such thing as safety nannies other than your hands and feet. So in that regard I am plenty comfortable driving hard. Regardless the information is comforting and thanks for explaining that it essentially just took the pedal remap off

[brocklanders]

What is "sport plus mode"?

[The Wind Breezes]

Originally Posted by brocklanders

What is "sport plus mode"?

He probably means shifter in sport + sport button pressed. There is no "sport+" in a 135 like in M cars or a Porsche.

[Yeineken]

I remember a thread a while back with the same situation. I believe in the end they chalked it up to the throttle response. Since DTC and DSC are off the last thing you'll want is a touchy throttle. So it backs it off slightly. No loss of power. The computer just wants you to be safe.

[Butters03]

Originally Posted by The Wind Breezes

He probably means shifter in sport + sport button pressed. There is no "sport+" in a 135 like in M cars or a Porsche.

that is correct, i couldnt think of a proper way to describe it so thats what made the most sense to me.

im hoping thats all it is although i have to admit i prefer the more sensative throttle response versus the dulled "safe" version.

Thanks for the input everyone

[Andrewcoja]

Just the throttle map. You can play around with it. Keep your foot at one throttle position and start pressing combination of traction control, sport button and sport mode.

[Solo_M_Tech]

"Dynamic Stability Control"

Just because you don't notice slip, doesn't mean the DSC system doesn't either. It can detect and correct wheel slip without triggering the flashing yellow light on the dash.

[The Wind Breezes]

Originally Posted by Uber///Madd

"Dynamic Stability Control"

Just because you don't notice slip, doesn't mean the DSC system doesn't either. It can detect and correct wheel slip without triggering the flashing yellow light on the dash.

Bro, seriously? Read the thread.

[Solo_M_Tech]

Originally Posted by The Wind Breezes

Bro, seriously? Read the thread.

I read the thread. The DSC system works with the DME to control engine output as well as brake bias and torque vectoring to keep the vehicle stable. Even if you turn the DSC off, it's still working, just at a lower rate. The DSC does alot more than just apply the brakes when needed.

[The Wind Breezes]

Originally Posted by Uber///Madd

I read the thread. The DSC system works with the DME to control engine output as well as brake bias and torque vectoring to keep the vehicle stable. Even if you turn the DSC off, it's still working, just at a lower rate. The DSC does alot more than just apply the brakes when needed.

With DSC off the car is still doing the "e-diff" and the brake magic to make your car not rotate on trail braking. That's it, and it's definitely not what the OP is talking about--you would know this if you read the thread because he says he has a "power loss" in DSC OFF with sport on over sport on WITH DSC ON, which would OBVIOUSLY be down to the different pedal map that's used when DSC is off. I don't even....

[Solo_M_Tech]

Originally Posted by The Wind Breezes

With DSC off the car is still doing the "e-diff" and the brake magic to make your car not rotate on trail braking. That's it, and it's definitely not what the OP is talking about--you would know this if you read the thread because he says he has a "power loss" in DSC OFF with sport on over sport on WITH DSC ON, which would OBVIOUSLY be down to the different pedal map that's used when DSC is off. I don't even....

You misunderstand how the DME and DSC work. I don't have time to explain either. DSC off is not DSC off. You can't completely disable it. You can pull the fuse for it, but you'll be put in limp mode for a reason.

[The Wind Breezes]

Originally Posted by Uber///Madd

You misunderstand how the DME and DSC work. I don't have time to explain either. DSC off is not DSC off. You can't completely disable it. You can pull the fuse for it, but you'll be put in limp mode for a reason.

Nah, I just explained how it works. That's funny that you have time to camp this thread but can't explain something that took me half a line.

To reiterate what I just said in slightly more detail:
--The car manages traction with the brakes DSC OFF...this is NOT traction control. The car will reduce engine power when it thinks the rear brakes have overheated from too much torque vectoring, but this is an entirely different issue and only happens under track conditions.
--The car manages braking across corners to keep the car from rotating on brakes. This does use the stability control hardware, but is stability control UNDER BRAKING ONLY
--The brakes also do a bunch of other stuff like change the pressure to try to combat fade, pre apply when they think you're going to hit, etc. NONE OF THIS HAS ANYTHING TO DO WITH STABILITY / TRACTION CONTROL

Please, by all means deprecate my version of this info. By the way, all this stuff can be coded out. Here's the thread for that:

http://www.1addicts.com/forums/showthread.php?t=1216642

[Solo_M_Tech]

Originally Posted by The Wind Breezes

Nah, I just explained how it works. That's funny that you have time to camp this thread but can't explain something that took me half a line.

To reiterate what I just said in slightly more detail:
--The car manages traction with the brakes DSC OFF...this is NOT traction control. The car will reduce engine power when it thinks the rear brakes have overheated from too much torque vectoring, but this is an entirely different issue and only happens under track conditions.
--The car manages braking across corners to keep the car from rotating on brakes. This does use the stability control hardware, but is stability control UNDER BRAKING ONLY
--The brakes also do a bunch of other stuff like change the pressure to try to combat fade, pre apply when they think you're going to hit, etc. NONE OF THIS HAS ANYTHING TO DO WITH STABILITY / TRACTION CONTROL

Please, by all means deprecate my version of this info. By the way, all this stuff can be coded out. Here's the thread for that:

http://www.1addicts.com/forums/showthread.php?t=1216642

You missed the entire point on how the DSC system uses and controls throttle position through the DME to control engine output, even when turned off. Here is a brief and not thorough enough explanation.

http://www.bmwblog.com/2009/02/06/wh...how-dsc-works/

[The Wind Breezes]

Originally Posted by Uber///Madd

You missed the entire point on how the DSC system uses and controls throttle position through the DME to control engine output, even when turned off. Here is a brief and not thorough enough explanation.

http://www.bmwblog.com/2009/02/06/wh...how-dsc-works/

Cool story bro. That link was pure air, and even though you've yet to add any new information to this thread despite posting 4 times in the last half hour, I'll keep my hopes open that you may yet provide us with an explanation for your claims. Wanna fill us in?