E60 545 Transmission Support Group
03-14-2007, 09:29 AM
#21
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It happened to me once then i took it to the dealer and told them about the slam issue and they did a tranny software upgrade has not happened since, i don't know how to duplicate it either, i know it's the california roll =) that makes it slam and of course when the tranny is still cold not warmed up yet.
03-14-2007, 09:34 AM
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I think you can get a rocket ship effect pretty much with any car, including a Fiat Panda, if you suddenly drop the clutch in 1st gear with the engine at 3500 rpm and the car is still rolling forward!
03-14-2007, 09:39 AM
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Another supposed software fix is available per this SIB: http://www.bmwtis.com/tsb/bulletins/...p/B240305g.htm
Editing: Sorry, that link seems to have expired. The bulletin is: SI B 24 03 05
It states that Progman V24.01 has a fix for the slam problem. I have not heard whether it actually does solve the problem.
Editing: Sorry, that link seems to have expired. The bulletin is: SI B 24 03 05
It states that Progman V24.01 has a fix for the slam problem. I have not heard whether it actually does solve the problem.
03-14-2007, 09:42 AM
#24
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Originally Posted by gwf545' post='402684' date='Mar 14 2007, 05:39 PM
Another supposed software fix is available per this SIB: http://www.bmwtis.com/tsb/bulletins/...p/B240305g.htm
ABC
03-14-2007, 09:47 AM
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Originally Posted by aybeesea' post='402686' date='Mar 14 2007, 12:42 PM
It's sometimes easier to link to a post directly, like this one from the previous page of this thread http://forums.e60.net/index.php?s=&sho...st&p=392668 then the links work.
ABC
ABC
03-19-2007, 03:54 AM
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Originally Posted by KAF' post='402663' date='Mar 14 2007, 04:41 PM
It's transmission not turbo, the normally aspirated 545 and 550 suffer as well.
Hmmmmm.... I wonder what version of the stock mapping DMS modifies?
Maybe the DMS reload will simply delete the transmission slam fix.
Have you considered this?
ABC
03-19-2007, 08:56 AM
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Originally Posted by aybeesea' post='404512' date='Mar 19 2007, 11:54 AM
Presumably after the Progman update you'll have to get DMS in to remap the ECU again.
Hmmmmm.... I wonder what version of the stock mapping DMS modifies?
Maybe the DMS reload will simply delete the transmission slam fix.
Have you considered this?
ABC
Hmmmmm.... I wonder what version of the stock mapping DMS modifies?
Maybe the DMS reload will simply delete the transmission slam fix.
Have you considered this?
ABC
03-19-2007, 08:59 AM
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Originally Posted by KAF' post='404600' date='Mar 19 2007, 04:56 PM
DMS only overwrite the ECU map, not Tranny software.
ABC
03-19-2007, 10:01 AM
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Originally Posted by KAF' post='402663' date='Mar 14 2007, 04:41 PM
It's transmission not turbo, the normally aspirated 545 and 550 suffer as well.
ZF acknowledge the 'feature' it is because the car stops in 2nd, tries to then take off in 2nd but the ''brain' realises the acceleration demand means it needs first. It then selects first and off you go, like a bat out of hell cause you kept pressing the gas waiting for something to happen.
The whole process creates a delay in moving off of around .5 to .9 of a second, but it seems like much longer.
Especially when pulling out into traffic, which at 60mph is covering 90 feet per second.
There is a big difference between pulling out when a car travelling at 60mph is 180 feet away and pulling out when it is 100ft away.
:thumbsdown:
ZF acknowledge the 'feature' it is because the car stops in 2nd, tries to then take off in 2nd but the ''brain' realises the acceleration demand means it needs first. It then selects first and off you go, like a bat out of hell cause you kept pressing the gas waiting for something to happen.
The whole process creates a delay in moving off of around .5 to .9 of a second, but it seems like much longer.
Especially when pulling out into traffic, which at 60mph is covering 90 feet per second.
There is a big difference between pulling out when a car travelling at 60mph is 180 feet away and pulling out when it is 100ft away.
:thumbsdown:
Quote from BMW - "The perceived throttle delay you have experienced while driving is in fact the result of the compliance of the diesel engine control system and the automatic transmission with EU regulations of the particulate emissions. It only occurs in limited engine operating conditions at high torque requirements when a gear change is imminent. It is only apparent in certain driving styles."
To continue, quote, "The system builds acceleration at a rate that prevents the excessive formation of soot particles that would be generated should full fuelling be permitted. Because of this control, the throttle is actually applied electronically by the engine management system and not directly by the driver. The effect is that the operation of the accelerator pedal can feel different due to the normal linear correlation between driver requirement and the throttle application being replaced by the necessarily non-linear system control. The system applies the throttle slower than expected at first, and then builds to the drivers load requirement. It is not possible to alter the throttle application under these driving conditions, as compliance with EU regulations must be maintained"
Quote "A slight alteration of driving style minimises the control necessary and avoids the effect"
One could see that petrol engines may suffer similar effects to meet emission standards too.
03-19-2007, 10:20 AM
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Originally Posted by Hawkwing' post='404621' date='Mar 19 2007, 06:01 PM
I posted a while back, it may explain further (my experience and BMW response) or confuse the situation as it's clear that there's a lot happening when you step on the 'loud control' in these cars.............
Quote from BMW - "The perceived throttle delay you have experienced while driving is in fact the result of the compliance of the diesel engine control system and the automatic transmission with EU regulations of the particulate emissions. It only occurs in limited engine operating conditions at high torque requirements when a gear change is imminent. It is only apparent in certain driving styles."
[snip]
Quote from BMW - "The perceived throttle delay you have experienced while driving is in fact the result of the compliance of the diesel engine control system and the automatic transmission with EU regulations of the particulate emissions. It only occurs in limited engine operating conditions at high torque requirements when a gear change is imminent. It is only apparent in certain driving styles."
[snip]
I have often had the effect with the engine at 2000 rpm, which means very far away from any gear change, and I have tried pretty much any "slight alteration" of driving style (press down slower, faster, more, less) without resolving the issue. The only remedy I have found is to force the gear in manual mode, with attendant inconvenients.