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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-04-2011, 09:17 AM
clspruiell clspruiell is offline
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When to use DTC? When to not?

I have read the owners manual and am very confused about this. I have an E93 335i manual trans.

The default position is zero lights. Push DTC button and "DTC" pops up as "Activated."

Does this mean I don't have any kinda traction control in the default (no dash lights) position?

When driving in rain should I select DTC? What about on Icy roads?

See, I thought all this traction stuff was "ON" by default every time i start the car. Now, I'm kinda learning that you have to turn on DTC.

Well, something is on by default. Because it won't let my wheels spin in gravel. So what is on by default (no lights), and what is changed when I activate DTC?

Last, im guessing that holding the DTC button turns all gadgets off right?
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  #2  
Old 05-04-2011, 09:32 AM
agx agx is offline
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Default dtc is on. My understanding is to press the button when you are stuck in mud or lots of snow...

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  #3  
Old 05-04-2011, 09:37 AM
clspruiell clspruiell is offline
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But when you press the DTC button, it then says "DTC Activated". As if DTC was deactivated by default or that I had no traction control in the first place.

So you're saying that for the safest driving, press nothing in heavy rain or icy conditions? But DO press DTC when basically stuck? Like an icy driveway. Ditch. etc?
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  #4  
Old 05-04-2011, 09:49 AM
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dandanio dandanio is offline
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By default both DSC and DTC are on. By pressing the button, you disable DSC, and you make DTC less obtrusive. By holding the button you disable both, having only ABS enabled. Manual should have those answers... IN BOLD.
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  #5  
Old 05-04-2011, 10:03 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by dandanio View Post
By default both DSC and DTC are on. By pressing the button, you disable DSC, and you make DTC less obtrusive. By holding the button you disable both, having only ABS enabled. Manual should have those answers... IN BOLD.
No, no, no.

When you start the car:
DSC is always ON.
DTC is always OFF

Pressing the DTC button *ACTIVATES* DTC, which modifies the limits of wheel-slip and other parameters that DSC allows.

Pushing the button for 3+ seconds, DSC and all traction control functions are off.

Braking functions (ABS, ABD, etc) are not impacted in either mode.
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  #6  
Old 05-04-2011, 10:06 AM
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dandanio dandanio is offline
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I stand corrected, DSC on by Default, DTC on by pressing, all off by holding. Relevant website: http://www.bmw.com/com/en/insights/t...n_control.html

Thanks! You can learn something new every day.
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  #7  
Old 05-04-2011, 10:08 AM
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Zooks527 Zooks527 is offline
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You use the default (no lights / no button push / full traction control) when you're driving, especially if it's slippery. The computer is on and trying to keep you going where you want.

You use DTC (one button push) when you want to allow some wheel spin without having the traction control system pull the power off. The typical example of this is when you're in snow or mud, are trying to get going, and will accept some wheel spin as the price of slogging forward.

You use "everything off" (press and hold) when you want to go spin the wheels and slide around for some fun.


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Last edited by Zooks527; 05-04-2011 at 11:48 AM.
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  #8  
Old 05-04-2011, 10:48 AM
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99.9 percent of the time, I leave everything engaged (no lights on the dashboard).

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  #9  
Old 05-04-2011, 11:04 AM
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Quote:
Originally Posted by Zooks527 View Post
You use DTC (one button push) when you want to allow some wheel spin without having the traction control system pull the power off.
BTW, DTC on or off makes little difference in a 335d - TOO MUCH TORQUE!
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  #10  
Old 05-04-2011, 11:07 AM
indeed330 indeed330 is offline
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Quote:
Originally Posted by Zooks527 View Post
You use the default (no lights / no button push / full traction control) when you're driving, especially of it's slippery. The computer is on and trying to keep you going where you want.

You use DTC (one button push) when you want to allow some wheel spin without having the traction control system pull the power off. The typical example of this is when you're in snow or mud, are trying to get going, and will accept some wheel spin as the price of slogging forward.

You use "everything off" (press and hold) when you want to go spin the wheels and slide around for some fun.


George
This.

I don't think a manufacturer would ever leave something like traction control up to the consumer to turn ON when they think "it's bad enough".
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  #11  
Old 05-04-2011, 11:17 AM
clspruiell clspruiell is offline
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Ok thanks this is great information. I know the manual mentions this but IMO is very confusing. It's obvious that it's confusing just by reading the differing opinions in the posts above.

So I think it's safe to say the safest way to drive on slippery dangerous roads (wet / ice) is to leave everything untouched. Press DTC when I need added wheel slippage (starting off on ice, in mud etc).
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  #12  
Old 05-04-2011, 11:49 AM
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groundeffect groundeffect is offline
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Agreed..until you need slip to start.
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  #13  
Old 05-04-2011, 12:08 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by clspruiell View Post
Ok thanks this is great information. I know the manual mentions this but IMO is very confusing. It's obvious that it's confusing just by reading the differing opinions in the posts above.

So I think it's safe to say the safest way to drive on slippery dangerous roads (wet / ice) is to leave everything untouched. Press DTC when I need added wheel slippage (starting off on ice, in mud etc).
Pretty much correct. However, you do *NOT* want wheel slip when *starting* out on ice or snow. You want to use it in situations that continued application of power/throttle is necessary - generally when you're climbing hills and don't want DSC/TCS to throttle down or use brakes to attenuate slipping. Don't forget that STATIC friction is greater than DYNAMIC friction - ie, you're better off never slipping in the first place.
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  #14  
Old 05-04-2011, 01:41 PM
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Zeichen311 Zeichen311 is online now
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Quote:
Originally Posted by Emission View Post
99.9 percent of the time, I leave everything engaged (no lights on the dashboard).
This. As I heard it put by (I think) a Performance Center instructor, "plenty of guys have found out the hard way they're not 'better than The Button.'" The computer's attention never lapses.

Quote:
Originally Posted by floydarogers View Post
Pretty much correct. However, you do *NOT* want wheel slip when *starting* out on ice or snow. ... Don't forget that STATIC friction is greater than DYNAMIC friction - ie, you're better off never slipping in the first place.
Pretty much pretty much correct. Straight from the manual:
Quote:
You may find it useful to briefly activate DTC
under the following special circumstances:
> When driving uphill on snow-covered roads,
in slush or on unplowed, snow-covered
roads
> When rocking a stuck vehicle free or starting
off in deep snow or on loose ground

> When driving with snow chains
When the surface you're sitting on lacks enough cohesion to provide any real purchase for the tires, DSC may intervene so aggressively that you can't get moving at all. That's one case where DTC can help.
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  #15  
Old 05-04-2011, 01:53 PM
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I might have this mixed up but I think:

Traction Control (DTC) is the ability for the car to remove power from wheels that are slipping (rear wheels in these RWD vehicles).
Stability Control (DSC) is the ability for the car to apply the brakes to the wheels it deems necessary to prevent the vehicle from spinning (oversteer, etc.)

Combine the two and you get some awesome drivability in cars that would otherwise be a lot to handle.

As a side note, I really wish I had tried to get my 6er to spin out with all the nannies active. I only did it with all of them off. Anyone else try to spin out with DSC fully on?
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  #16  
Old 11-23-2014, 06:38 AM
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Informative. Thanks
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  #17  
Old 11-23-2014, 07:25 AM
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What is confusing is the terminology used. In one's mind, DTC acts to prevents slipping (rear-wheel spin) while DSC prevents skidding. In reality, DSC curbs both skidding and slipping. By pressing the button once, you turn off the skid control, and lessen the slipping control. By holding it, you turn off both.
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  #18  
Old 11-24-2014, 02:32 PM
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http://www.bimmerfest.com/forums/sho...d.php?t=810480

Someone else posted this today. Link in 1st post of thread.
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  #19  
Old 01-25-2015, 07:49 PM
Mo4u Mo4u is offline
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Dynamic Traction Control (DTC).

Dynamic Traction Control (DTC) allows more wheel slip and thus a more dynamic driving style with higher wheel traction and DSC controlling stability. A small amount of spin on the drive wheels improves traction when pulling off from a standstill in snow or on loose terrain.

Dynamic Traction Control (DTC) is a sub-function of the Dynamic Stability Control (DSC) system that can be turned on and off. DTC has two major roles: to regulate traction and to enable sports-style driving while providing active stability control.
When the drive wheels start losing traction the DSC automatically begins stabilisation measures. The Dynamic Stability Control system curbs the engine output and stops slip on the wheels. In exceptional situations, however, a small amount of wheel slip can be an advantage.

When driving in deep snow, slush or on loose terrain a small amount of wheel spin improves traction. For these occasions, as well as those when the drivers want a sportier driving style, the DTC can be activated by pressing a button and this allows more slip and reduces the DSC’s curbing of the engine. The result: better traction and more thrust.

The DTC also makes driving on snow and ice-free roads more dynamic. When activated, the DTC allows sporty drivers more room to manoeuvre around curves than the Dynamic Stability Control and even permits controlled drifts. The driver retains complete control over the vehicle in every situation and the Dynamic Stability Control’s stabilising measures remain active even when the DTC is activated.
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  #20  
Old 01-27-2015, 07:22 AM
nerushan5 nerushan5 is offline
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Ok so if I'm stuck in the snow, should I press the DTC button once so it says it's activated?
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  #21  
Old 01-27-2015, 08:45 AM
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floydarogers floydarogers is offline
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Originally Posted by nerushan5 View Post
Ok so if I'm stuck in the snow, should I press the DTC button once so it says it's activated?
Yes. Although once you get stuck it might be too late.
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  #22  
Old 01-27-2015, 08:57 AM
fdriller9 fdriller9 is offline
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I'm not going to go into what mode DSC/DTC is really in when you leave the button only, when you press it momentarily, and when you hold it, etc.

But this is the way I use DTC.

In most conditions, you leave the button alone.

In situations where you are getting no where because of wheel spin, you press the DTC button momentarily. This mode allows more wheel spin but not unlimited wheel spin. On a non-AWD model, I normally use this mode when I'm stuck in snow and the DSC module is limiting wheel spin due to loss of traction. This mode will allow you to build some momentum before the DME limits power.

Holding the DTC button will completely disable traction control. You have unlimited wheel spin. I use this when I want to spin the rear end around. There are very few situations where completely disabling traction control is useful besides having fun with it off.
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  #23  
Old 08-14-2015, 12:59 PM
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I will try this out!!! I have a 325xi E90... if you're right, imma kill my mechanic lol (joking of course)

My car is a daily driver and I don't go nuts when driving - in all honest, the AWD to me is really useful during winter months especially during snow. Would disabling DTC/DSC during summer (6 months approx) have any adverse effects on drive-train or front diff or TC??


Quote:
Originally Posted by fdriller9 View Post
I'm not going to go into what mode DSC/DTC is really in when you leave the button only, when you press it momentarily, and when you hold it, etc.

But this is the way I use DTC.

In most conditions, you leave the button alone.

In situations where you are getting no where because of wheel spin, you press the DTC button momentarily. This mode allows more wheel spin but not unlimited wheel spin. On a non-AWD model, I normally use this mode when I'm stuck in snow and the DSC module is limiting wheel spin due to loss of traction. This mode will allow you to build some momentum before the DME limits power.

Holding the DTC button will completely disable traction control. You have unlimited wheel spin. I use this when I want to spin the rear end around. There are very few situations where completely disabling traction control is useful besides having fun with it off.
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  #24  
Old 08-14-2015, 01:13 PM
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Biggiefl Biggiefl is offline
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Just your tire wear...then again I doubt you have much spin with an AWD 325 when disabled.
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  #25  
Old 08-14-2015, 01:33 PM
maxq maxq is offline
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Originally Posted by Biggiefl View Post
Just your tire wear...then again I doubt you have much spin with an AWD 325 when disabled.
Like I said, I'm not going for donuts here lol just extended drives which I have to do as part of my job. Rear tires seem to wear out on e90xi more quickly anyway (at least they did on mine).

As long as the tire wear does not interfere with the awd or damage the viscous coupling or the transfer case in general, I have no issues driving around without dtc/dsc. Just need confirmation...
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