Trans thumps into gear

[Spitfire007]

When going up a steep incline, at very slow speed, I'll press on the gas, the revs increase a little, the car doesn't move at first then thumps into gear.
Like it winds up, and then goes.

It can sometimes do this when departing aggressively from a stoplight. Like a half second delay between foot down until actual motion.

What gives?


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[sepheroth86]

Some more information on your car may be helpful.

DSG (S6/7)

ZF8 (A6/7)

ZF8 (RS7)

???

[Spitfire007]

Sorry.
2016 A6 3.0T CREC with ZF8


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[2k16A6]

My 2016 3.0T/ ZF8 does some annoying stuff sometimes too. Biggest issue I have usually occurs when I roll thru a stop sign and then then hit the throttle, engine revs but car doesn't accelerate, it almost feels like it freewheels then bangs into gear. It's always done this, I think the transmission is thinking I'm about to stop, but I see a gap in traffic and hit the accelerator and it gets confused. Is this what yours does??

**Edit to add this really only occurs in the first 4-5 miles of driving, once up to temp it does not seem to happen

[DetroitV6]

I'm getting the same thing with my ZF8, both while Stage 1 and stock. I do have a Eurocode transmission mount, so I think it's my motor mounts. They passed the brake stand test, but I'm thinking they're leaking. The shop didn't check for purple fluid under the skid pan.

Pricing out a shop willing to install 034 Street density mounts now.

[Spitfire007]

My 2016 3.0T/ ZF8 does some annoying stuff sometimes too. Biggest issue I have usually occurs when I roll thru a stop sign and then then hit the throttle, engine revs but car doesn't accelerate, it almost feels like it freewheels then bangs into gear. It's always done this, I think the transmission is thinking I'm about to stop, but I see a gap in traffic and hit the accelerator and it gets confused. Is this what yours does??

**Edit to add this really only occurs in the first 4-5 miles of driving, once up to temp it does not seem to happen

Yep. Similar. But I do have auto start stop disabled all the time so that's not it.

I drove a manual trans BMW the other day and I felt so much more satisfied in the drivetrain dept.
If you want to be smooth and slow the A6 is amazing. But given my Jekyll and Hyde driving style, I don't think an auto is for me. I just can't work around it, and need it to work around me.



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[2k16A6]

Yep. Similar. But I do have auto start stop disabled all the time so that's not it.

I drove a manual trans BMW the other day and I felt so much more satisfied in the drivetrain dept.
If you want to be smooth and slow the A6 is amazing. But given my Jekyll and Hyde driving style, I don't think an auto is for me. I just can't work around it, and need it to work around me.



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Yeah my auto start stop has been coded off since I bought the car so same here.

I do have a custom tcu tune, maybe I’ll reach out to berk to see if that’s a setting that can be adjusted…


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[Kael]

But given my Jekyll and Hyde driving style, I don't think an auto is for me. I just can't work around it, and need it to work around me.

Have you found Sport mode?

[Spitfire007]

Have you found Sport mode?

Thank you for asking!
And yes, I have, and find it maddeningly simple in that all it does it change where the trans shifts. Downshifts are too little too late, or too slow.
Manual is too slow: grab a gear before a curve and you're through the curve before it shifts.
I'm considering a TCU tune, but also considering just going back to a manual trans car (totally diff platform) where I'm just happier and don't have to deal with manufacturers compromises or a computer deciding what I can or cannot request (vs demand).




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[Spitfire007]

Don't get me wrong, my 2016 A6 3.0 is a bullet, and comfy and quiet. It's also beautiful.
It's just missing on a few things that really make the experience for me:
Better contoured seats (BMW wins there)
Faster trans or a manual (q5 is better, c'mon Audi!)
Better weight distribution
Steering feedback (there is none)




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[Alabama]

I'm considering just going back to a manual trans car (totally diff platform) where I'm just happier and don't have to deal with manufacturers compromises or a computer deciding what I can or cannot request (vs demand

I feel your pain! My S6 is the first Audi automatic I've owned in my lifetime. It's not fun. I assumed since Audi and Porsche are both under VW, the Audi DSG would be like the Porsche DSG and worth a try. Bad assumption. And no more manual Audis in the US. I don't know if it's possible/reasonable to buy a European Audi with manual and ship it to the US. People did that years ago when the "grey market" difference in price made it economic. Oh, well.

[Valpo A7]

Check fluid level and the condition of the fluid.

How many miles on the trans fluid? Audi says lifetime but ZF says around 80K. If your fluid is original it might be worth getting the trans fluid and filter changed. If you still have problems after that then look further.

[Spitfire007]

2016 A6 3.0T with 67000 on it.


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[A665]

A TCU tune will correct virtually all of the poor/sluggish/ill-timed shifting behavior.

[WhiteA7]

My TCU tune didn't fix the thud/ jerky shift from first to second gear when cold.

[A665]

My TCU tune didn't fix the thud/ jerky shift from first to second gear when cold.

Gotcha. I believe that particular issue is a symptom of trans mount slop, which I dealt with by installing a single trans mount insert. Jack the car up, loosen two (2) fasteners holding the factory insert in place, remove the factory insert, replace with aftermarket using factory fasteners. No more thud/jerk in my case. Can't remember what I paid for the insert but I think it was about $60.

[WhiteA7]

Gotcha. I believe that particular issue is a symptom of trans mount slop, which I dealt with by installing a single trans mount insert. Jack the car up, loosen two (2) fasteners holding the factory insert in place, remove the factory insert, replace with aftermarket using factory fasteners. No more thud/jerk in my case. Can't remember what I paid for the insert but I think it was about $60.

Already done. Its a trans issue. It revs higher than normal then hard shifts to second when cold

[sepheroth86]

Already done. Its a trans issue. It revs higher than normal then hard shifts to second when cold

Mine occasionally does the same.

I am curious if maybe a bad engine mount is at play? Because the trans insert did help minimize it.

[WhiteA7]

Mine occasionally does the same.

I am curious if maybe a bad engine mount is at play? Because the trans insert did help minimize it.

Could be. I plan on replacing my motor mounts in 5000 miles when I replace the trans fluid at about 50,000 miles

[prestige.phantom]

My TCU tune didn't fix the thud/ jerky shift from first to second gear when cold.

The ZF8 hates first gear. Mine always jerks when shifting down into first and when its cold it jerks on the upshift from 1 to 2 also. I have driven a lot of ZF8 cars, and this seems to be a transmission issue not exclusive to C7 Audi's. Some cars do program it better and some cars are smoother than others, but I think its a ZF problem more than anything else.

[A665]

Interesting. I've not experienced anything more than the slop issue that surfaced when I added the ECU/TCU tune and which went away as soon as I installed the trans mount insert.

[prestige.phantom]

Interesting. I've not experienced anything more than the slop issue that surfaced when I added the ECU/TCU tune and which went away as soon as I installed the trans mount insert.

Trans insert and TCU tune definitely helped, but Ive experienced this issue to varying degrees in Alfa Romeos, Maseratis, Audis, Jags, etc.

[Spitfire007]

Which TCU tune?
I sometimes feel or hear a slight clunk as it downshifts itself from 4-3-2.
If this is just a characteristic, I can better come to grips with it.
But sometimes I worry the trans is going to fail, and then I'll have a very expensive and large paperweight of a car that needs a $12000 trans.

Thinking of going Giulia Quadrifoglio.
Same tranny (maybe beefed up), but much MUCH more fun and responsive without being too jerky.


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[prestige.phantom]

Which TCU tune?
I sometimes feel or hear a slight clunk as it downshifts itself from 4-3-2.
If this is just a characteristic, I can better come to grips with it.
But sometimes I worry the trans is going to fail, and then I'll have a very expensive and large paperweight of a car that needs a $12000 trans.

Thinking of going Giulia Quadrifoglio.
Same tranny (maybe beefed up), but much MUCH more fun and responsive without being too jerky.


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Im on 034's TCU tune. I've driven 2 Giulia Quads and they are much better, but the first gear downshift still jerks a little.

[TheBlackMarvel]

Could be. I plan on replacing my motor mounts in 5000 miles when I replace the trans fluid at about 50,000 miles

It’s mostly likely not the motor mounts. I had the 1-2 hesitation and hard shift problem and the first thing I did was replace motor mounts (mostly preventative, wouldn’t have replaced them just fix this issue). That made no difference at all in the low speed hard 1-2 shift.

I also did the trans insert and rear diff upper and lower insert after that, which made for a small improvement. This was still on stock TCU tune.

By far the biggest change was the TCU tune though. I’ve had both the 034 and Berk tunes and both very significantly improved the 1-2 shift. So much so that I would say it’s a non issue now, whereas before it drove me nuts and passengers would think I couldn’t drive correctly.


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[prestige.phantom]

Which TCU tune?
I sometimes feel or hear a slight clunk as it downshifts itself from 4-3-2.
If this is just a characteristic, I can better come to grips with it.
But sometimes I worry the trans is going to fail, and then I'll have a very expensive and large paperweight of a car that needs a $12000 trans.

Thinking of going Giulia Quadrifoglio.
Same tranny (maybe beefed up), but much MUCH more fun and responsive without being too jerky.


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Giulia Quad is an incredible car, you should definitely consider one!

[akingzkid]

How much are these TCU tunes???