DSC off V.S. manual shift

[minorsetbacks]

I was doing a little experimenting last night. The thought crossed my mind to turn of the DSC to see if throttle lag would be reduced from a dead stop. I turned off the DSC and put the vehicle in sport mode. I guess I bumped the shifter forward putting in manual mode first gear without even realizing it. When I took off the cars acceleration seemed to be the same as with the DSC on, but when the vehicle reached the top of first gear it didn’t automatically up shift like usual. I was surprised to find the engine racing against a rev limiter and the transmission restricted to first gear. I immediately shifted to Drive and the vehicle resumed a normal shift pattern. I was fairly quick at recognizing the problem and I am very happy the racing RPM’s didn’t hurt my engine. I think this could be a possible situation in any X5 or X3 so I am posting this story to give everyone a heads up.

[xnsf]

thanks for the tip, must go try it

how do you know if the DSC is intervening? my indicator in my gauge cluster doesn't blink like the one in the e90, although technically that's DTC...

[noncom23]

Yeah, did it two weeks ago. If memory serves, no auto
shifting at all in the manual mode. A friend of mine has a
pepper and he says his will shift in manual mode if you
don't.

[xnsf]

Originally Posted by noncom23

Yeah, did it two weeks ago. If memory serves, no auto
shifting at all in the manual mode. A friend of mine has a
pepper and he says his will shift in manual mode if you
don't.

doesn't shift with DSC off, right?

[minorsetbacks]

Yes thats correct, it won't shift if the DSC is off and you put the vehical in Manual mode

[xx3]

Originally Posted by noncom23

Yeah, did it two weeks ago. If memory serves, no auto
shifting at all in the manual mode. A friend of mine has a
pepper and he says his will shift in manual mode if you
don't.

No, my X3 will shift in manual mode. I've done it before. Sometimes after driving for a while at a constant speed one forgets they are in manual mode - especially when the car downshifts itself to M2.

Needless to say the music was loud, and I was wondering something felt different. A look at the tach and I was at redline, and then it shifted.

Now the question here, is whether or not DSC being off removes this auto shifting capability. It seems, as per one board member's experience, it does... I'll have to go try...

[minorsetbacks]

Originally Posted by xx3

No, my X3 will shift in manual mode. I've done it before. Sometimes after driving for a while at a constant speed one forgets they are in manual mode - especially when the car downshifts itself to M2.

Needless to say the music was loud, and I was wondering something felt different. A look at the tach and I was at redline, and then it shifted.

Now the question here, is whether or not DSC being off removes this auto shifting capability. It seems, as per one board member's experience, it does... I'll have to go try...

Yes that exactly what i was getting at. The vehicle can still be shifted in manual mode, but it won't auto shift in manual with the DSC off.

[SilverBullet]

My car will not shift automatically as it approaches redline, even with dsc on. I think this is because of the Dinan software. I had it in first on time and didnt realize and I went all the way into the red. The tach didnt bounce?

[///Manuel]

I have a 4.8is and in manual mode, as far as I can tell the car will upshift and downshift for me if the revs get too high (redline) or too low (1k) (VERY frustrating). This is regardless of DSC (on or off). Not only that but I thought redline was 7k when it shifts at 6.5k... grrrr, I want my last horses!

[alpac]

Originally Posted by minorsetbacks

... I am very happy the racing RPM’s didn’t hurt my engine.

The rev limiter would have prevented any damage to your engine. Also A BMW engine like most "sporty" engine can go over red zone for a short period of time without any impact on the engine.