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      07-10-2012, 06:52 PM   #1
ihc95
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Question 335i Auto tranny question

Hey everyone. I have a question about the 6 speed ZF auto in the 335i. I have only had the car for 2 months so Im not sure how the car is supposed to feel like. While driving around at low speeds (<20 mph) it sometimes feels like the tranny is preventing the car from coasting, almost like a manual would be used to brake a car. When the car downshifts it begins to coast properly again. Sometimes I think its kind of cool because it makes me feel like Im driving a manual haha. But anyway Im just asking if this is normal and if other 335i owners experience this. This issue isnt really bothering me but I would greatly appreciate your input. Thanks!!

Also, I know the 6 speed auto in the 335i is designed to run with the torque converter locked most of the time to increase efficiency so maybe this is what Im feeling?
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      07-10-2012, 07:10 PM   #2
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Quote:
While driving around at low speeds (<20 mph) it sometimes feels like the tranny is preventing the car from coasting
Well you are in gear, and not neutral. As you slow down the car will shift lower and lower till first...

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When the car downshifts it begins to coast properly again.
So what you're saying is that when the car is slowing down the transmission is shifting down to an adequate gear is an issue? That's what it's supposed to do.
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      07-10-2012, 07:39 PM   #3
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Quote:
Originally Posted by be1ieve1111 View Post
Well you are in gear, and not neutral. As you slow down the car will shift lower and lower till first...



So what you're saying is that when the car is slowing down the transmission is shifting down to an adequate gear is an issue? That's what it's supposed to do.
Not what Im saying. Ive driven many other automatic transmission cars and none of them effectively slow themselves. Its almost like the brakes are sticking on at low speeds. Its not the brakes though, as I had them replaced last month at the BMW dealership.
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      07-10-2012, 07:48 PM   #4
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Mine does the same, ihc95. At low speeds, it feels like it's applying the brakes by itself at times, and it's a different feeling than when it downshifts. Never had that feeling in any other car I've driven.
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      07-10-2012, 07:49 PM   #5
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Ok are you in M/DS mode or just regular mode?
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      07-10-2012, 07:54 PM   #6
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Quote:
Originally Posted by be1ieve1111 View Post
Ok are you in M/DS mode or just regular mode?
For me, it does it in any mode. It's subtle, but feels like braking, then it lets go for a bit, then brakes again.... except I'm not applying pressure to the pedal at all.
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      07-10-2012, 07:55 PM   #7
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Again, this only happens at low speeds. Say 20mph or less.
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      07-10-2012, 08:08 PM   #8
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Most cars are geared too much for fuel efficiency including the ZF 8 speed in newer BMW's. Tries to get to top gear very quickly. The ZF 6 is geared perfectly and more for performance. Normal, carry on.
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      07-10-2012, 08:24 PM   #9
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Quote:
Originally Posted by be1ieve1111 View Post
Ok are you in M/DS mode or just regular mode?
I hardly ever use M/DS mode and when I do Im well over 20 mph So yeah I'd say just regular mode as I cant speak for the other modes.
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      07-10-2012, 08:27 PM   #10
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Completely normal. Makes me loathe driving any other automatic that just feels like you're rolling in neutral when you let off the gas.
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      07-10-2012, 08:33 PM   #11
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I've noticed this too.
Feels like engine braking aha
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      07-10-2012, 09:09 PM   #12
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It is normal. I like it because it also means the engine/transmission are ready to pull right away...
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      07-10-2012, 09:16 PM   #13
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The 335i ZF torque converter locks up once the car is in motion so the engine is directly coupled to the drive wheels like it would be with an MT in gear. Because of this you may feel engine braking as the car downshifts.
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      07-10-2012, 09:18 PM   #14
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Makes sense. Thanks guys.
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      07-10-2012, 09:53 PM   #15
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The more I read threads like this and learn about my 335, the more I love it! I've owned many vehicles, but it's my first BMW.
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