545 Hesitation from the stop
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Joined: May 2004
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From: Frederick Maryland
Originally Posted by dba1t' date='Dec 6 2004, 05:02 PM
Put the Steptronic transmission in M1 and pull away.? You will notice an immediate differrence with no hesitation.
[snapback]65438[/snapback]
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Joined: Aug 2004
Posts: 98
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From: Minneapolis, MN USA
My Ride: 2004 545iA Titanium Silver/Gray, Poplar----Cold Weather Pkg, Comfort Seats, Logic 7 Audio, Heated Rear Seats
Originally Posted by streak' date='Dec 6 2004, 02:01 PM
I had a 7 series loaner recently and experienced the delay from stationary. The explaination to me was that the car goes into a quasi neutral when stationary and when you hit the gas it needs to engage the gear first before moving off.
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
[snapback]65594[/snapback]
Yes, there is a large difference in ratios between 1st and 2nd: 4.17 vs. 2.34 per BMWNA web site.
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Joined: Mar 2004
Posts: 4,672
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From: New Orleans, LA USA
My Ride: E90 M3
Model Year: 2011
Originally Posted by Tim C' date='Dec 6 2004, 02:30 PM
[quote name='streak' date='Dec 6 2004, 02:01 PM']I had a 7 series loaner recently and experienced the delay from stationary. The explaination to me was that the car goes into a quasi neutral when stationary and when you hit the gas it needs to engage the gear first before moving off.
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
[snapback]65594[/snapback]
Yes, there is a large difference in ratios between 1st and 2nd: 4.17 vs. 2.34 per BMWNA web site.
[snapback]65610[/snapback]
[/quote]Agreed TimC. My car definitely begins to move when I let up on the brake, indicating the car is gear.
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Joined: Oct 2004
Posts: 299
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From: Johannesburg, South Africa
Here is the quote from ZF about what I was talking about.
"Torque converter with novel actuation
In automatic transmissions the torque converter is mainly used to move off the line. Part of the new electronic control system for the transmission is the Stand-by Control /SBC. Instead of having the converter running against the engine with the vehicle standing still (foot on the brake pedal), as was previously the case, the converter is now disconnected from the powertrain so that there is only minimal residual load. This further reduces fuel consumption. "
This would mean that as you take your foot off the brake and the car starts rolling forward the TC should engage. If you are too quick moving from brake to accelerator the delay you feel may be the TC trying to engage and accelerate at the same time. If you let the car roll a little first before accelerating is the hesitation still there?
Interestingly on the 7 they have an auto parking brake option when you come to a stop. With this option set on, car wont creep forward at a stop but then when you punhch the accelerator the car releases the brake and moves off with no hesitation.
Streak
"Torque converter with novel actuation
In automatic transmissions the torque converter is mainly used to move off the line. Part of the new electronic control system for the transmission is the Stand-by Control /SBC. Instead of having the converter running against the engine with the vehicle standing still (foot on the brake pedal), as was previously the case, the converter is now disconnected from the powertrain so that there is only minimal residual load. This further reduces fuel consumption. "
This would mean that as you take your foot off the brake and the car starts rolling forward the TC should engage. If you are too quick moving from brake to accelerator the delay you feel may be the TC trying to engage and accelerate at the same time. If you let the car roll a little first before accelerating is the hesitation still there?
Interestingly on the 7 they have an auto parking brake option when you come to a stop. With this option set on, car wont creep forward at a stop but then when you punhch the accelerator the car releases the brake and moves off with no hesitation.
Streak
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Joined: Aug 2004
Posts: 98
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From: Minneapolis, MN USA
My Ride: 2004 545iA Titanium Silver/Gray, Poplar----Cold Weather Pkg, Comfort Seats, Logic 7 Audio, Heated Rear Seats
Originally Posted by streak' date='Dec 7 2004, 02:21 AM
Here is the quote from ZF about what I was talking about.
"Torque converter with novel actuation
In automatic transmissions the torque converter is mainly used to move off the line. Part of the new electronic control system for the transmission is the Stand-by Control /SBC. Instead of having the converter running against the engine with the vehicle standing still (foot on the brake pedal), as was previously the case, the converter is now disconnected from the powertrain so that there is only minimal residual load. This further reduces fuel consumption. "
This would mean that as you take your foot off the brake and the car starts rolling forward the TC should engage. If you are too quick moving from brake to accelerator the delay you feel may be the TC trying to engage and accelerate at the same time. If you let the car roll a little first before accelerating is the hesitation still there?
Interestingly on the 7 they have an auto parking brake option when you come to a stop. With this option set on, car wont creep forward at a stop but then when you punhch the accelerator the car releases the brake and moves off with no hesitation.
Streak
"Torque converter with novel actuation
In automatic transmissions the torque converter is mainly used to move off the line. Part of the new electronic control system for the transmission is the Stand-by Control /SBC. Instead of having the converter running against the engine with the vehicle standing still (foot on the brake pedal), as was previously the case, the converter is now disconnected from the powertrain so that there is only minimal residual load. This further reduces fuel consumption. "
This would mean that as you take your foot off the brake and the car starts rolling forward the TC should engage. If you are too quick moving from brake to accelerator the delay you feel may be the TC trying to engage and accelerate at the same time. If you let the car roll a little first before accelerating is the hesitation still there?
Interestingly on the 7 they have an auto parking brake option when you come to a stop. With this option set on, car wont creep forward at a stop but then when you punhch the accelerator the car releases the brake and moves off with no hesitation.
Streak
[snapback]65986[/snapback]
Members
Joined: Aug 2004
Posts: 98
Likes: 0
From: Minneapolis, MN USA
My Ride: 2004 545iA Titanium Silver/Gray, Poplar----Cold Weather Pkg, Comfort Seats, Logic 7 Audio, Heated Rear Seats
Originally Posted by kscarrol' date='Dec 6 2004, 02:49 PM
[quote name='Tim C' date='Dec 6 2004, 02:30 PM'][quote name='streak' date='Dec 6 2004, 02:01 PM']I had a 7 series loaner recently and experienced the delay from stationary. The explaination to me was that the car goes into a quasi neutral when stationary and when you hit the gas it needs to engage the gear first before moving off.
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
The gear engaged is first not second it's just the engagement delay that is being felt.
As a matter of interest my 530D always starts in 1st unless you are in steptronic manual mode and you come to a stop in which case the box defaults to M2.
The difference in feel between starting in 1st or starting in 2nd is so big that there is no doubt as to weather you are in 1 or 2.
My Landrover Horror Story
[snapback]65594[/snapback]
Yes, there is a large difference in ratios between 1st and 2nd: 4.17 vs. 2.34 per BMWNA web site.
[snapback]65610[/snapback]
[/quote]Agreed TimC. My car definitely begins to move when I let up on the brake, indicating the car is gear.
[snapback]65621[/snapback]
[/quote]OT: Happy birthday, kscarrol, if you do that kind of thing. Personally, I'm too old to count anymore.
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