DS mode and Diesels
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My Ride: E61 Titanium-Grey, Leather Dakota Black, 525d, Steptronic, Navi Prof & TV, Voice Input, Panorama ceiling, Xenon with dir, etc
Hi,
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
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Originally Posted by BigGrey' post='218728' date='Jan 3 2006, 07:27 PM
Hi,
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
The 535d doesn't lose performance at the top of the rpm range (2nd turbo kicks in) so it probably works great...
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Originally Posted by BigGrey' post='218728' date='Jan 3 2006, 02:27 PM
Hi,
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
Regarding ur post i didn't drive the 530d steptronic but i can assure u it shouldn't change too far from the point when the turbo looses it's grunt (near 4000rpm). Going to the redline is not optimum and i guess some softwerer for single-turbo diesels is needed to correct that. If i were u i would take it to manual and shift up around 4000rpm. I know that because i also have a tdi passat wich as all single turbo diesels looses power after around 4000rpm. After that u rev the car pointless.
Regarding my own experience with my car i can tell that it keeps pushing and pushing even at 4800 rpm. It is amaizing how that big turbo does the work. So in the 535d it's nto the same. From idle to redline this car pushes like there is no end. Even after 200km/h it's still like a cock going onwards till it reaches aroun 250-255 where smth terrbile happens . I'm saying that many petrol cars with around 200-250 hp like golf 5 gti or seat leon cupra 225bhp or whatever, after 200km/h they loose vigor and grunt, the needle snails it's way to 250 but in this OMG i'm still impressed, the needle doesn't show sign of fatigue. It keeps going and going with those redline upshifts and kinda jerky and slow gear changes.
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Originally Posted by BigGrey' post='218728' date='Jan 3 2006, 02:27 PM
Hi,
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
#5
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YES, same here.
Under hard acceleration (D or DS) I find the revs go way beyond the useable range and then drop to low after the gear change.
Some time ago, when I fitted the ACS box to my car the tech. told me how clever the BMW Auto box is because it monitors boost and makes sure that gear changes are optimum. I very much doubt this.
Streak
Under hard acceleration (D or DS) I find the revs go way beyond the useable range and then drop to low after the gear change.
Some time ago, when I fitted the ACS box to my car the tech. told me how clever the BMW Auto box is because it monitors boost and makes sure that gear changes are optimum. I very much doubt this.
Streak
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Originally Posted by streak' post='218744' date='Jan 3 2006, 02:57 PM
YES, same here.
Under hard acceleration (D or DS) I find the revs go way beyond the useable range and then drop to low after the gear change.
Some time ago, when I fitted the ACS box to my car the tech. told me how clever the BMW Auto box is because it monitors boost and makes sure that gear changes are optimum. I very much doubt this.
Streak
Under hard acceleration (D or DS) I find the revs go way beyond the useable range and then drop to low after the gear change.
Some time ago, when I fitted the ACS box to my car the tech. told me how clever the BMW Auto box is because it monitors boost and makes sure that gear changes are optimum. I very much doubt this.
Streak
And this regards more the 535d owners since it occurs more often or only on this engine. Other diesel owners may certify if this thing occurs: So it's like this, i'm accelerating a bit harder and the gearbox downshifts a gear, and then not being to agressive with the throttle (not at the floor), neddle goes obviously in higher rpm range, i continue to accelerate hard, car is moving faster but the rpm neddle stays almost put, like not revving to the redline if i don't weld my foot deep into the throttle. The car goes faster and faster but the rpm neddle doesn't seem to be very active (like at around 3000rpm-3500 rpm). I am in D mode though...If i barry my foot down the neddle moves normaly around the rev range to the red line but if not it kinda slouches although the car is accelerating.
I don't expect you to understand me, i jsut hope i made it as clear as possible.
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I have seen this in my 530D as well. The tech. explained it to me as
torque-converter lockup, a feature not a problem of the gearbox. As he said it can lock or unlock at any time.
I sometimes even notice a slight dip in revs before they continue to increase.
torque-converter lockup, a feature not a problem of the gearbox. As he said it can lock or unlock at any time.
I sometimes even notice a slight dip in revs before they continue to increase.
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Originally Posted by streak' post='218753' date='Jan 3 2006, 08:32 PM
I have seen this in my 530D as well. The tech. explained it to me as
torque-converter lockup, a feature not a problem of the gearbox. As he said it can lock or unlock at any time.
torque-converter lockup, a feature not a problem of the gearbox. As he said it can lock or unlock at any time.
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I always thought that the gearbox held the gears for too long after 4,000 rpm on my 530d. The power just drops off after this point, however, its a different story with the 535d's second turbo as ColeJ rightly said earlier.
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Hi,
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
It seems to me that the DS upshift mode is not optimized for acceleration for my 525d.
For acceleration, it should change gear at 4000 rpm instead of going until the redline, no? Sometimes i feel like saying "hey, come on, this is a diesel shift up!"
That is perfect for the petrol engines, but for diesels, it feels like they loose performance when at top of rpm range.
Do you have the same feeling in 530d and 535d Steptronic?
The 535d doesn't lose performance at the top of the rpm range (2nd turbo kicks in) so it probably works great...
[/quote]
535D pulls right across the rev range because of the progresive handover from turbo to turbo...love the wide power band, was going to get a 530i petrol (had a 330i and loved that) but once I experianced the shot in the back from the torque of the 535 i couldnt resist