Drifting the E90

[David Yong]

my car can drift or not

 

[t2ribena]

what if a driver take the car to such a high speed and turn abruptly causing the car to loose all traction on all wheels so it goes sideways especially in the wets...can DSC solve this scenario?

Actually scenario 2 also not possible. Once the wheel sensors sensed the difference in wheel speeds, in this case rear wheels spinning faster then power will be cut off. If the car still over steers then individual braking will be applied automatically. As such drifting with DSC on is not possible.

With ASC it may be possible as ASC can only help in an understeering situation.

 

[t2ribena]

i think kennot but donut sure easy...hehehe

my car can drift or not

 

[ALBundy]

what if a driver take the car to such a high speed and turn abruptly causing the car to loose all traction on all wheels so it goes sideways especially in the wets...can DSC solve this scenario?

Depends on what speed, available traction on the surface and run off area.

DSC is working all the time but time is also the limiting factor in bringing back stability to the car.

Of course in extreme conditions say like aquaplaning, DSC won't be able to help since there is no traction, even some f1 cars with traction control few years back also crashed in the wet.

Recently did the csc5 launch in Sepang, it was raining pretty heavy. Some of the media staff were experiencing over steering at turn 3 but DSC managed to keep them on the track, without DSC a visit to the gravel would have been the final result. Of course Sepang is wide, if it's nordschleife sure tapau already.

 

[t2ribena]

on my ex-e81, sometime the DSC caught by surprise and didn't interfere and i ended up power sliding around in the car park...so can but need to find where is the weekness...all electronic control unit has its response limitation for sure...just need to find it then exploit...also good to know for safety reasons...

on the e39...the DSC is too conservative or it can read the drivers mind...when u try to be funny straight cut power...

 

[ahmz]

Well, situation I was in was i was behind the other car on the right lane. Steered to the left lane quite abruptly and the quickly steered right again, a bit like doing the flick i guess. The corner tightened then and I automatically steered more to the right. That was when the back end started to slide. The slide however could be controlled quite easily by countersteering.

Any comments on this? As bro al is quite certain that there is no way this can happen with the DSC on, then is my DSC kaput then? I still see the xmas tree lighting up once in a while though when I corner thru bumpy corners....

 

[XXX]

...a drift and a slide is 2 different thing...A Drift is more of a controlled slide using throttle and steering inputs...a slide is basically a mild oversteer and this could happen with the DSC on because it normally happens when there is weight transfer (front heavy, back light) during braking and sudden abrupt steering input when the foot is off the throttle, because at that moment in time there is no input to the ecu...but with DSC on, even during the slide, throttling it would just probably correct the slide and will not give you control to prolong the slide or 'Drift' because by then the electronics would have already kicked in ...but it could be a different scenario if the DSC is off but then without LSD also abit difficult unless you have big balls and carrying alot of speed into the corner or you are 'Master Yoda' or 'Wong Sifu'...

 

[XXX]

Well, situation I was in was i was behind the other car on the right lane. Steered to the left lane quite abruptly and the quickly steered right again, a bit like doing the flick i guess. The corner tightened then and I automatically steered more to the right. That was when the back end started to slide. The slide however could be controlled quite easily by countersteering.

Any comments on this? As bro al is quite certain that there is no way this can happen with the DSC on, then is my DSC kaput then? I still see the xmas tree lighting up once in a while though when I corner thru bumpy corners....

..in ur case the reason why the DSC probably didnt light up was... during the slide your foot was of the throttle, u counter steered and corrected the slide and when u put ur foot back on the throttle there was already no reason for the DSC to work....and why was it so easy to correct?.. because its a BMW!....but dont push ur lucklah..: )

 

[ashman55]

It isn't possible to drift with DSC on.

Once during a performance day at Maltrade parking lot,at a corner the track was covered by palm oil that you can't even walk on.I was told to spin the 320.Nobody manage to do the drft with DSC on.only DSC off the spin happened..

 

[ALBundy]

Yes Ashman, I was the instructor during that Performance Day.

As XXX eloquently explained, what could have happened is just a slide and DSC will then cut power delivery. There is no way to drift it with DSC on as power is cut off. And if the slide persists, then individual braking will be applied to stabilise the car.

 

[ashman55]

Yes Ashman, I was the instructor during that Performance Day.

As XXX eloquently explained, what could have happened is just a slide and DSC will then cut power delivery. There is no way to drift it with DSC on as power is cut off. And if the slide persists, then individual braking will be applied to stabilise the car.

Thanks to you and experienced like that makes me appreciate the capabilities of UDM and the DSC is there for a reason..

 

[ALBundy]

DSC is like a safety net, and also like a personal coach. I use it in Sepang to know if I have gone in too fast into a corner or power out too early. The trick is to drive smooth without having any DSC intervention

 

[t2ribena]

i am sure after reading this thread some of you will go to prove that the car can drift with DSC on...hahahaha

better be safe...

 

[XXX]

...can be done....charge in at abt 130kmh ....use weight transfer to loose traction, pedal to the metal, some steering input...since both wheels completely no traction so can probably trick the computer that both wheels are spinning at the same speed...and hope for the best....and remembering the wise words of George of the Jungle..."Watch Out For that Tree!" or in the urban jungle more likely 'Lamp Post'....hehehehehe

 

[ALBundy]

...can be done....charge in at abt 130kmh ....use weight transfer to loose traction, pedal to the metal, some steering input...since both wheels completely no traction so can probably trick the computer that both wheels are spinning at the same speed...and hope for the best....and remembering the wise words of George of the Jungle..."Watch Out For that Tree!" or in the urban jungle more likely 'Lamp Post'....hehehehehe

Please let me know when you are attempting this, will bring my video camera and post on youtube!! hahaha

 

[XXX]

Video cam and also a scrapper... to scrape whatever thats left of me of the lamp post.

 

[Jules]

wah all this technical jargon giving me a headache.....seriously!

my old e30 aslo got dsc, asc, traction control and ABS....plus park assist - that's me, the main CPU! he he

be safe lar and yes, my dsc can turn off one, so drifting ( no sliding ) can do on demand one! LOL

thanks bundy n XXX for the explanations!

 

[JFT63]

Yes Ashman, I was the instructor during that Performance Day.

As XXX eloquently explained, what could have happened is just a slide and DSC will then cut power delivery. There is no way to drift it with DSC on as power is cut off. And if the slide persists, then individual braking will be applied to stabilise the car.

So bundy, u did a slide with me during the B.Berendam Performance Day didnt u? thats what i thought u did bro..a bit confused here:stupid:

 

[ALBundy]

Yeah when I did the power slide it was with DSC off.

 

[ahmz]

Thanks XXX and AlBundy for the clarification!
BTW, just changed to BBS CH 18" from the OEM 17". At 3K rpm, I get about 3 - 4 kmh more. Also, butt accelerometer tells me acceleration is a bit better. Is this due to the lighter alloys or am I just dreaming? LOL