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D4 - Transmission Gearboxes, diffs, drive shafts.

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  #1  
Old 14th August 2016, 07:45 PM
damtom85 damtom85 is offline
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Default D4 owners, feedback about transmission needed

hi

I'm wondering if any of you noticed any issues with transmission when engine cold. I find gear changes quite rough while engine is still cold. When it reaches normal working temperature it gets smooth. l know that when transmission oil is cold it can cause higher friction. I have 8hp55a gearbox in my car and I found thread on BMW forum regarding 8hp55(letter 'a' in 8HP55a indicates use only for Audi as it has quattro feature). BMW owners have the same views about that gearbox, harsh when cold.

what are your view about this?
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  #2  
Old 14th August 2016, 08:11 PM
paulrstaylor paulrstaylor is offline
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Not an issue that I have noticed on mine......it does seem to hold gears longer when cold, presumably to aid warm up?
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Old 16th August 2016, 08:18 PM
Joe2.0E Joe2.0E is offline
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My 2011 3.0TDI can be quite rough when cold, most noticeable when selecting reverse. I have had the ATF changed and it didnt make any difference.
By comparison my old 6 speed D3 was smoother when cold but nothing as "Clever" in terms of seamless/fast changes you get on the D4.
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Old 16th August 2016, 09:24 PM
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tonupkid tonupkid is offline
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If its a DSG box, there's your answer.
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Old 16th August 2016, 09:52 PM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by tonupkid View Post
If its a DSG box, there's your answer.
It isn't a DSG box.
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  #6  
Old 18th August 2016, 06:36 PM
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The 2014 3.0tdi I'm using at the moment is perfectly smooth when cold, same as when warm.
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  #7  
Old 19th August 2016, 12:43 PM
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Mines silky smooth, if it didn't have the gear numbers on the dash I probably would have to keep a close eye on the revs to see changes, not that the revs ever build up to much....
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Old 19th August 2016, 04:24 PM
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Quote:
Originally Posted by paulrstaylor View Post
It isn't a DSG box.
So what kind of box is it? Does is pre-select the gears?
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  #9  
Old 19th August 2016, 07:26 PM
paulrstaylor paulrstaylor is offline
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It's an eight-speed auto, believe it is a ZF-8HP box.

https://en.wikipedia.org/wiki/ZF_8HP_transmission
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  #10  
Old 19th August 2016, 07:29 PM
paulrstaylor paulrstaylor is offline
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I should add, although it a slush box, it is very intuitive and smooth and never seems to be in the wrong gear of have a pause for kick-down.

Perhaps partly due to the additional ratios over the older 6 speed, but also likely due to the integration with the navigation system, meaning it can change down as you approach a bend for example!?
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