Does DCT "roll free" like a manual or do they idle forward when you release brake?

Manalope · 02-12-2008, 04:42 PM

I'm UPGRADING to a 2008 M3 (from my previous 2000 360 Modena F1 that broke every time I drove it)...

the 360 F1 would roll free like a real manual (I liked this about it).

any info on how DCT behaves? Does it roll free or does it idle forward like an automatic?

Patricius · 02-12-2008, 04:58 PM

Unless it has some system built in to regulate it, it will roll forward and backward freely. Remember, it's still a manual box - just with an electrohydraulic mechanism.

In the Ferrari F1 system, the clutch was:

A) Constantly slipped while holding position on a hill or in reverse
B) Made of bread and butter

I'm anxious to hear what other troubles you had with your Modena. Did you do a PPI prior to getting it? I've heard they are pretty reliable as long as the service is kept up to date and the campaigns are all completed.

Best,

Patrick

Manalope · 02-12-2008, 05:02 PM

Quote:

Originally Posted by Patricius

Unless it has some system built in to regulate it, it will roll forward and backward freely. Remember, it's still a manual box - just with an electrohydraulic mechanism.

In the Ferrari F1 system, the clutch was:

A) Constantly slipped while holding position on a hill or in reverse
B) Made of bread and butter :D

I'm anxious to hear what other troubles you had with your Modena. Did you do a PPI prior to getting it? I've heard they are pretty reliable as long as the service is kept up to date and the campaigns are all completed.

Best,

Patrick

It had to do with the 20,000 miles I put on it :>

I used to keep the tow hook behind the passenger seat so that I wouldnt have to unstrap the toolbox and take it out every time I needed to get towed onto a flatbed :<

swamp2 · 02-12-2008, 05:05 PM

It depeds they car be designed to behave in either way. VW DSG does creep like an automatic. The new Mitsubishi Evo does not creep like an automatic. Of course the hill holding feature is entirely separate from the level ground creep issue. I would love the know what BMW has implemented here as well.

Patricius · 02-12-2008, 05:06 PM

SMG II and III both rolled forward and backward freely. My guess is that DCT will behave the same or they would have announced the difference.

southlight · 02-12-2008, 05:11 PM

If I understand it correctly you can have it both ways. DCT doesn't creep by default, but you can activate the so called "low speed assistant", which seems to be a fancy description for creeping.

Best regards, south

rvacha · 02-12-2008, 05:31 PM

I'm guessing that it will be somewhere in between IF the M3 really has BER. With BER it would make sense to keep the clutch engaged on deacceleration to recoup as much energy as possible. Then somewhere at low RPM and/or vehicle stopped it might fully disengage

Patricius · 02-12-2008, 06:20 PM

Quote:

Originally Posted by rvacha

I'm guessing that it will be somewhere in between IF the M3 really has BER. With BER it would make sense to keep the clutch engaged on deacceleration to recoup as much energy as possible. Then somewhere at low RPM and/or vehicle stopped it might fully disengage

That's how it feels on my SMG II. On deceleration the clutch remains engaged and only at very low speeds/RPM can you feel it disengage.

Epacy · 02-12-2008, 07:01 PM

Quote:

Originally Posted by Manalope

It had to do with the 20,000 miles I put on it :>

I used to keep the tow hook behind the passenger seat so that I wouldnt have to unstrap the toolbox and take it out every time I needed to get towed onto a flatbed :<

Sad that 20k on a Ferrari seems like alot.

swamp2 · 02-12-2008, 07:56 PM

Quote:

Originally Posted by southlight

If I understand it correctly you can have it both ways. DCT doesn't creep by default, but you can activate the so called "low speed assistant", which seems to be a fancy description for creeping.

Best regards, south

That's right I do think I read that. As I understand this feature it is not so much a user preference but a feature to ease low speed parking where you want to move really slowly. Either way I guess you could certainly call it a preference but that does not seem to be how BMW is presenting it.

devo · 02-12-2008, 08:42 PM

Can you rev the engine as if you had the clutch depressed with DCT?

mofomat · 02-12-2008, 09:41 PM

Quote:

Originally Posted by devo

Can you rev the engine as if you had the clutch depressed with DCT?

On SMG II and III, yes. On M-DCT? How the hell can anyone know this when nobody outside of BMW has even driven it yet?

It is likely though.

Patricius · 02-12-2008, 09:45 PM

Quote:

Originally Posted by mofomat

On SMG II and III, yes.

If you attempt to rev the engine by quickly blipping the throttle you can build revs, but if you try to rev the engine while in 1st, the clutch will dump almost immediately. The only way to rev an SMG car is to put it into neutral.

devo · 02-13-2008, 08:12 AM

Quote:

Originally Posted by mofomat

On SMG II and III, yes. On M-DCT? How the hell can anyone know this when nobody outside of BMW has even driven it yet?

It is likely though.

I don't know how the hell anyone outside of BMW would know being that no one has driven it yet. So, I am really, really, REALLY, sorry for asking such a STUPID question.

How;ever, i sO glad dat U took de time 2 answer me? dumb kestIoN..

devo · 02-13-2008, 08:13 AM

Quote:

Originally Posted by Patricius

If you attempt to rev the engine by quickly blipping the throttle you can build revs, but if you try to rev the engine while in 1st, the clutch will dump almost immediately. The only way to rev an SMG car is to put it into neutral.

Thanks.

monsta · 02-13-2008, 09:06 AM

Quote:

Originally Posted by Epacy

Sad that 20k on a Ferrari seems like alot.

as I'm reading the thread I was thinking the same thing....

02-12-2008, 04:42 PM	#1
Manalope hi Drives: Jerez E92 M3, 2000 Ferrari 360 Join Date: Oct 2007 Location: SoCal 909 Posts: 93 iTrader: (0)	Does DCT "roll free" like a manual or do they idle forward when you release brake? I'm UPGRADING to a 2008 M3 (from my previous 2000 360 Modena F1 that broke every time I drove it)... the 360 F1 would roll free like a real manual (I liked this about it). any info on how DCT behaves? Does it roll free or does it idle forward like an automatic?
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02-12-2008, 05:31 PM	#7
rvacha Captain Drives: '08 E92 M3 Join Date: Mar 2007 Location: Cleveland, OH Posts: 745 iTrader: (0) Garage List 2008 E92 M3 [0.00]	I'm guessing that it will be somewhere in between IF the M3 really has BER. With BER it would make sense to keep the clutch engaged on deacceleration to recoup as much energy as possible. Then somewhere at low RPM and/or vehicle stopped it might fully disengage __________________ '03 X5 4.4i Blue/Tan '06 E90 330Xi 6MT Sparkling Graphite/Terra '08 E92 M3 6MT Jerez/Speed Cloth <-- Evil Twin
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02-12-2008, 04:58 PM	#2
Patricius Lieutenant Drives: 04 325xi, 05 M3 cpe, 08 M3 cpe Join Date: Feb 2008 Location: Philadelphia, PA Posts: 532 iTrader: (0)	Unless it has some system built in to regulate it, it will roll forward and backward freely. Remember, it's still a manual box - just with an electrohydraulic mechanism. In the Ferrari F1 system, the clutch was: A) Constantly slipped while holding position on a hill or in reverse B) Made of bread and butter I'm anxious to hear what other troubles you had with your Modena. Did you do a PPI prior to getting it? I've heard they are pretty reliable as long as the service is kept up to date and the campaigns are all completed. Best, Patrick
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02-12-2008, 05:05 PM	#4
swamp2 Major General Drives: E92 M3 Join Date: Sep 2006 Location: San Diego, CA USA Posts: 9,398 iTrader: (1)	It depeds they car be designed to behave in either way. VW DSG does creep like an automatic. The new Mitsubishi Evo does not creep like an automatic. Of course the hill holding feature is entirely separate from the level ground creep issue. I would love the know what BMW has implemented here as well.
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02-12-2008, 05:06 PM	#5
Patricius Lieutenant Drives: 04 325xi, 05 M3 cpe, 08 M3 cpe Join Date: Feb 2008 Location: Philadelphia, PA Posts: 532 iTrader: (0)	SMG II and III both rolled forward and backward freely. My guess is that DCT will behave the same or they would have announced the difference.
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02-12-2008, 05:11 PM	#6
southlight Moderator / European Editor Drives: BMW Join Date: Apr 2006 Location: Germany Posts: 6,700 iTrader: (0)	If I understand it correctly you can have it both ways. DCT doesn't creep by default, but you can activate the so called "low speed assistant", which seems to be a fancy description for creeping. Best regards, south
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02-12-2008, 08:42 PM	#11
devo Lieutenant Colonel Drives: .2GT3/335Cpe/991 GT3 coming Join Date: Nov 2006 Location: thinking about cars, girls and money, not necessarily in that order. Posts: 1,941 iTrader: (0)	Can you rev the engine as if you had the clutch depressed with DCT?
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