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D4 - Transmission Gearboxes, diffs, drive shafts. |
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#1
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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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Audi A8 D4 4H 2012 3.0tdi Quattro 8spd ZF 8HP55a |
#2
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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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#3
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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. |
#4
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If its a DSG box, there's your answer.
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A journey of a thousand+ (epic) miles, begins with a single step, (to the door of an 8). Lau Tzu |
#5
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#6
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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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Cars... '93 Audi Coupe 2.0 Alpine White (sold) '99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold) '00 Audi S8 Agate Grey (Sold ) '11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ) |
#7
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So what kind of box is it? Does is pre-select the gears?
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A journey of a thousand+ (epic) miles, begins with a single step, (to the door of an 8). Lau Tzu |
#8
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Quote:
like Joe2 I do experience rough changes when cold, I had ATF changed, but before I did that I had new software updated by audi. I'm thinking to do one more time ATF change and maybe ask Audi to do adaptation, reset everything in transmission ecu. so basically transmission will start learning from beginning. Or maybe someone on this forum knows how to do that through Vcds? question to Joe2 - do you know what type ATF did garage use when they changed for you? my used according to specification by manufacturer but I think they should use proper ZF lifeguard 8. Next time I will use that one.
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Audi A8 D4 4H 2012 3.0tdi Quattro 8spd ZF 8HP55a |
#9
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I used my local Audi Dealer to do the ATF change and they used the Audi branded ATF fluid. I'll check the part no.s from the invoice and update the thread when I have them to hand.
It would appear to be a common issue with the 8 speed ZF box on F10 BMW's if you have a look on some Beemer forums. The ATF change made no obvious difference with my car but overall its still a fantastic autobox. I suspect the issue may be software related rather than an issue with the ATF. Unless it gets worse, I'm not too concerned. |
#10
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i agree it is still fantastic gearbox, just this issue when cold. as you mentioned BMW users are complaining too, I found actually thread about 1 series but if you say f10 has issue as well then I will not worry so much. also as you said ATF change didn't cure it, so I also think it is more software related. over 60k miles on mine
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Audi A8 D4 4H 2012 3.0tdi Quattro 8spd ZF 8HP55a |
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