[akhter]

I have a 335i Step, and I had read many of the posts on DSC/DTC and most seemed to center around stablility/braking.

Last few days I have been playing with driving the car with DTC (button press once) and I have to say acceleration in clearing a bit snappier. The difference is quite clear--like going from D to DS mode. Power delivery is much smoother and more urgent. I was surprised because I was playing with it to try and slide the rear of the car when cornering (on empty roads). Was not expecting anything on acceleration as I was already on DS.

I did a bit more searching and found this and that seems to support it:

"In the 3 Series and Z4 Roadster, DTC also plays a role when on bends - it enhances the car's propulsion and its sports-style qualities. The driver is in full control of their vehicle within a predetermined parameter: the regulatory functions are inactive. DSC optimises directional stability within certain boundaries."

http://www.e90post.com/forums/showth...c+acceleration

Anyone else notice the same thing?

Safety nuts out there, I only turn on DTC on empty roads, and when weather is perfect. I would never even think of turning on DTC on rain/snow or on freeways. I also never fully turn off DSC.

[TRZ06]

I don't know, but I wish the 335I had a mode where you could dis-engage the traction control while keeping the stability control on, instead of just dumming the point of activation.

On the Corvette , it's called Competetive Mode, totally eliminating the traction control while giving the security of the stability control.

[BK]

Originally Posted by TRZ06

I don't know, but I wish the 335I had a mode where you could dis-engage the traction control while keeping the stability control on, instead of just dumming the point of activation.

On the Corvette , it's called Competetive Mode, totally eliminating the traction control while giving the security of the stability control.

What would be cool is a sliding scale for both, like on Gran Turismo.

[Year's_End]

Originally Posted by TRZ06

I don't know, but I wish the 335I had a mode where you could dis-engage the traction control while keeping the stability control on, instead of just dumming the point of activation.

On the Corvette , it's called Competetive Mode, totally eliminating the traction control while giving the security of the stability control.

+1. lol I do that in Forza 2

[Evo8MRto335I]

Originally Posted by TRZ06

I don't know, but I wish the 335I had a mode where you could dis-engage the traction control while keeping the stability control on, instead of just dumming the point of activation.

On the Corvette , it's called Competetive Mode, totally eliminating the traction control while giving the security of the stability control.

^^^+1. That is one of the best ideas I heard so far.

[Evo8MRto335I]

Originally Posted by akhter

I have a 335i Step, and I had read many of the posts on DSC/DTC and most seemed to center around stablility/braking.

Last few days I have been playing with driving the car with DTC (button press once) and I have to say acceleration in clearing a bit snappier. The difference is quite clear--like going from D to DS mode. Power delivery is much smoother and more urgent. I was surprised because I was playing with it to try and slide the rear of the car when cornering (on empty roads). Was not expecting anything on acceleration as I was already on DS.

I did a bit more searching and found this and that seems to support it:

"In the 3 Series and Z4 Roadster, DTC also plays a role when on bends - it enhances the car's propulsion and its sports-style qualities. The driver is in full control of their vehicle within a predetermined parameter: the regulatory functions are inactive. DSC optimises directional stability within certain boundaries."

http://www.e90post.com/forums/showth...c+acceleration

Anyone else notice the same thing?

Safety nuts out there, I only turn on DTC on empty roads, and when weather is perfect. I would never even think of turning on DTC on rain/snow or on freeways. I also never fully turn off DSC.

It makes a lot of sense. I took my car to the dragstrip a few times and I could never break into the 12's. I was running with the system completely off and sometimes with the traction control on but the moment that I pushed the DTC on once I started getting cosnistent 12's and I laso picked 3 mph trap speed.

My prefer method of acceleration is now always the DTC button pressed once. Just for the record, I also have steptronic

[Year's_End]

Wait a minute, traction control regulates wheel spin in a straight line...wouldn't that potentially slow down the car in an acceleration run?

[f30er]

I found this out too a few months back. Lined up with a friend in his Boxster S, I just moved it into DS and took off, I barely had 2 feet on him by ~100mph!....That same day, about an hour later, we were leaving the meet and lined up again, this time I hit DTC once.....Much bigger difference! Had a full car length by 100 this time.....

Shoulda thought of that at the track, I had everything completely off and was getting shitty times cuz of the tire spin.....

[akhter]

Originally Posted by TRZ06

On the Corvette , it's called Competetive Mode, totally eliminating the traction control while giving the security of the stability control.

Maybe that is what DTC is?

Bottom line: DS+DTC FTW

[E90ice]

I have noticed that also. At first I keept telling myself that it was all in my head...but after a while it became clear that having DTC on, as opposed to default, the car fast more responsive.

[slowturbo]

I have taken my car to the strip a few times also, and results seemed to be consistently better with DTC on.

[tctic]

Originally Posted by Bimmer Loyalist

Wait a minute, traction control regulates wheel spin in a straight line...wouldn't that potentially slow down the car in an acceleration run?

You must be one of those who is confused about DTC. Your car starts off with DTC off and DSC fully on. DTC is only on when you press the button. And also, as others have implied, pressing DTC once does not mean traction control off, it's just a program that allows more slippage at the wheels and more slide.

With regards to the competition mode on Corvettes, BMW went with DTC as it acts like an electronic limited slip differential. So basically that is Traction Control at work.

[Year's_End]

Originally Posted by tctic

You must be one of those who is confused about DTC. Your car starts off with DTC off and DSC fully on. DTC is only on when you press the button. And also, as others have implied, pressing DTC once does not mean traction control off, it's just a program that allows more slippage at the wheels and more slide.

With regards to the competition mode on Corvettes, BMW went with DTC as it acts like an electronic limited slip differential. So basically that is Traction Control at work.

No, I understand how it works completely. I also know the effects too, considering I've done it myself. The time I think power would feel more consistent and less interrupted would be if the cars tail began to lose lateral grip, whereas stability control would normally take place and cut throttle. However, in a straight line, traction control usually cuts throttle. When you push the button once, it states "traction control engaged, stability management limited" or something along those line. That means that you can get slightly tail happy, but at the same time it should affect straight line runs as well.

[ianbiz]

Originally Posted by BK

What would be cool is a sliding scale for both, like on Gran Turismo.

Yes!!

[Uberdude328i]

Wow, I was totally confused about DTC and was about to make a post making a complete @$$ of myself. I figured I'd check BMWUSA.com before just to make sure. Good thing I did. I thought DTC regulated something completely different from DSC. It's just a less intrusive program. Now the OP makes complete sense and I'm not surprised at all by their findings. Now if it weren't for that pesky open diff...

[blanca333]

wait wait im confused

regular = traction control

dtc = a little traction control

hold dtc button so everything is off = no traction

???

[Year's_End]

Regular = Both traction and stability control engaged

Once = Traction ctrl engaged. Stability less intrusive

Hold = Everything off