DCT Initial Acceleration

[petercory]

After the car has sat overnight, following startup, it is really necessary to race the engine to get the car to move either forward or in reverse. Once it has cycled through several gears or once the the car has warmed up & has not completely cooled off, it instantly moves in either forward or in reverse as soon as you have selected a gear. Is this normal, if not does anyone have a suggested cure for the problem?

[Rajmun340]

Originally Posted by petercory

After the car has sat overnight, following startup, it is really necessary to race the engine to get the car to move either forward or in reverse. Once the car has warmed up or has not completely cooled off, it moves in either forward or in reverse as soon as you have selected a direction. Is this normal, if not does anyone have a suggested cure for the problem?

Interesting, just for the record, with a 6MT you can backup the car in reverse following startup with only idling rpm and the clutch pedal, no throttle.
Same for 1st gear although i do apply a bit of throttle very minimal.

[obe100]

normal...

[Helmsman]

I notice the (DCT) clutch slips a bit initially if I don't let cold start pass but after this no issues. Could that be it OP?

[kscarrol]

Just to clarify, as soon as you put the car in D or R it starts to move? If so, that is not normal unless you are pressing the gas pedal. When initially put into D or R, both clutches are engaged until you press the gas...

[petercory]

it does not start to move when put into gear immediately after starting it if it's sat overnight or after sitting in the parking lot at work for a normal workday; I have to give it a substantial amount of throttle to get it to move as I back out of my driveway in reverse and again as I as I put it in D to go forward down the street or if at work as I put it into D to pull out of the parking lot. I'll check the exact revs tomorrow morning.

[dougjones]

Normal behavior

[Doc Oc]

Originally Posted by petercory

it does not start to move when put into gear immediately after starting it if it's sat overnight or after sitting in the parking lot at work for a normal workday; I have to give it a substantial amount of throttle to get it to move as I back out of my driveway in reverse and again as I as I put it in D to go forward down the street or if at work as I put it into D to pull out of the parking lot. I'll check the exact revs tomorrow morning.

Same here. When it is ice cold I have to give it a lot of gas to back up the driveway which is relatively steep. Always thought it was normal.

[jester17]

For my 2009 E93 M I have to nudge the gas pedal a bit, but certainly not revv it...

[Helmsman]

Originally Posted by petercory

it does not start to move when put into gear immediately after starting it if it's sat overnight or after sitting in the parking lot at work for a normal workday; I have to give it a substantial amount of throttle to get it to move as I back out of my driveway in reverse and again as I as I put it in D to go forward down the street or if at work as I put it into D to pull out of the parking lot. I'll check the exact revs tomorrow morning.

That was a long night...

[bimmerfrk]

my car does not move when put in gear. it needs some throttle to get her going. Not normal op.

Now not m cars will start to lurch forward. My old 328 did exactly what you are saying.

Maybe you car has been hanging around to many volvos

[dparm]

Originally Posted by DrFerry

I just have to barely touch my gas pedal to get it to move once the DCT selects a gear.

That's the expected behavior. The M-DCT has the "low-speed assistant" that means you should only have to tap the gas pedal very lightly & briefly for it to let the clutches out and creep forward (or back). It's great for inching forward in traffic or in parking lots.

[crl8474]

It sounds to me like he is referring to transmission slip. I'm having the same issue. It feels like the clutch is slipping when the car is cold. Once warmed up its less apparent. I'm having mine checked next week as I'm also experience a slight delay on downshift engagement when in S4 or S5. I would have it looked at.

[Landman]

Mine does the same thing when it's cold outside. Only when first starting up in the morning or after work and only when putting it in drive. It doesn't do it going into reverse. It feels like the clutch is slipping a little. If I put it in drive and wait for a second it helps. I never noticed it doing this in the warmer months.

[Three Pedal Steve]

Maybe this cold start behavior is there protect our rod bearings?

[///M Power-Belgium]

Originally Posted by Three Pedal Steve

Maybe this cold start behavior is there protect our rod bearings?

Thank god

[Helmsman]

On my second box (brand new while previous also was with fresh <20k miles) and both behaved the same way. When cold, clutch slip. Gentle tap on the throttle to first engage or wait for cold cycle to end and all fine.

No reason to force slip if not needed.

[ScoopALoop]

Originally Posted by Three Pedal Steve

Maybe this cold start behavior is there protect our rod bearings?

Without a doubt

[atopa2002]

Originally Posted by Helmsman

On my second box (brand new while previous also was with fresh <20k miles) and both behaved the same way. When cold, clutch slip. Gentle tap on the throttle to first engage or wait for cold cycle to end and all fine.

No reason to force slip if not needed.

What is force slip ?

[OzCraig]

I think he meant "induce slip".

[Helmsman]

Originally Posted by atopa2002

What is force slip ?

No need to force/push the box to slip and wear the clutches, if you instead can make them drop and engage with tapping the throttle. Makes sense?

Cheers