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      07-16-2012, 01:54 AM   #1
haitham87
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DCT

Sorry for this ignorant question.. But do 08,09,10 135's get DCT transmission, or do they get a normal auto box?

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      07-16-2012, 07:05 AM   #2
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Normal auto through 2010. 2011 and later get DCT. Other major changes in 2011 were switch to N55 engine (harder to tune) and constant rate springs that reduce, but do not eliminate under steer.
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      07-16-2012, 07:07 AM   #3
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Didnt know that about the springs.
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      01-02-2013, 08:34 PM   #4
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Maybe I can add another ignorant question here, since I can't make a topic of my own yet.

I just got a 2011 135i with DCT. I used to have a Z4 with SMG. With the SMG, the clutch never engaged until I hit the gas. With the DCT, as soon as I let go of the break, the car starts moving, both in 1st and reverse. Is this expected behavior? So if I gradually release the break and nudge forward, my clutch is slipping? Isn't this a bit of useless wear?

Thanks for any info!
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      01-02-2013, 10:01 PM   #5
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The SMG gearbox is a single clutch transmission. The DCT is a dual clutch transmission. And the clutch isn't slipping, the cars behavior is normal.
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      01-03-2013, 12:36 AM   #6
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Quote:
Originally Posted by lufasz View Post
Maybe I can add another ignorant question here, since I can't make a topic of my own yet.

I just got a 2011 135i with DCT. I used to have a Z4 with SMG. With the SMG, the clutch never engaged until I hit the gas. With the DCT, as soon as I let go of the break, the car starts moving, both in 1st and reverse. Is this expected behavior? So if I gradually release the break and nudge forward, my clutch is slipping? Isn't this a bit of useless wear?

Thanks for any info!
I test drove a M3 other day and when I let go the brake the car is not moving at all unless I step on gas peddle otherwise the vehicle remains unmoved.
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      01-03-2013, 03:40 PM   #7
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Quote:
Originally Posted by zamboni View Post
I test drove a M3 other day and when I let go the brake the car is not moving at all unless I step on gas peddle otherwise the vehicle remains unmoved.
That's because the M3 engine doesn't have sufficient torque at idle revs to move the car, whereas the 135 does
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      01-03-2013, 11:39 PM   #8
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Quote:
Originally Posted by GeeRam View Post
That's because the M3 engine doesn't have sufficient torque at idle revs to move the car, whereas the 135 does
Do you mean 297lb of torque is not eoungh ? wow that is interesting.
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      01-04-2013, 12:13 AM   #9
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Quote:
Originally Posted by lufasz View Post
Maybe I can add another ignorant question here, since I can't make a topic of my own yet.

I just got a 2011 135i with DCT. I used to have a Z4 with SMG. With the SMG, the clutch never engaged until I hit the gas. With the DCT, as soon as I let go of the break, the car starts moving, both in 1st and reverse. Is this expected behavior? So if I gradually release the break and nudge forward, my clutch is slipping? Isn't this a bit of useless wear?

Thanks for any info!
Yes, this is normal behavior. The car has a creep feature built in which the M3 does not have. In these settings the car is slipping the clutch, though I'd hardly call it unnecessary wear since the clutch will slip either way, either automatically or with your own foot.


At first I didn't like this, but it has proved very useful, particularly when my less car savvy boyfriend goes to drive.
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      01-04-2013, 02:37 AM   #10
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Quote:
Originally Posted by zamboni
Quote:
Originally Posted by GeeRam View Post
That's because the M3 engine doesn't have sufficient torque at idle revs to move the car, whereas the 135 does
Do you mean 297lb of torque is not eoungh ? wow that is interesting.
Off idle lol diesel.

Nnnnope. Remember that peak torque is not off idle torque.
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      01-04-2013, 03:51 PM   #11
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Quote:
Originally Posted by zamboni View Post
Do you mean 297lb of torque is not eoungh ? wow that is interesting.
I suggest you read again exactly what I wrote.....
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      01-04-2013, 07:21 PM   #12
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Quote:
Originally Posted by zamboni View Post
Do you mean 297lb of torque is not eoungh ? wow that is interesting.
I would argue that you dont have that much torque at idle. the torque curve will be steep until you reach the torque band then it will taper off quickly. The torque band however on the 135 is almost at red line. I havent measured it but judging by experience i suspect that you may be about half that amout of torque at idle or less.
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      01-04-2013, 07:55 PM   #13
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Quote:
Originally Posted by lufasz View Post
Maybe I can add another ignorant question here, since I can't make a topic of my own yet.

I just got a 2011 135i with DCT. I used to have a Z4 with SMG. With the SMG, the clutch never engaged until I hit the gas. With the DCT, as soon as I let go of the break, the car starts moving, both in 1st and reverse. Is this expected behavior? So if I gradually release the break and nudge forward, my clutch is slipping? Isn't this a bit of useless wear?

Thanks for any info!
My SA said most of DCT has a HDC built in so the car won't roll back on hill or flat surface no wonder why on the M3 it will not move even if you have your foot off the brake peddle.
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