2018 A10 "bouncy" shifts?

[Rash]

My 18 GT w/A10 will sometimes bounce back and forth a bit after shifting into gear, usually 4th or 5th gear especially under load like up a hill. Anyone else notice this?

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[Lonmon]

Not quite sure what you mean about bouncing back and forth. I do occasionally feel some engine lug vibration when light on the throttle and it feels like the trans should have downshifted but is trying to hold the gear. You can just down shift it manually, give it more throttle so it downshifts or wait it out. A little annoying but I can live with it.

 

[Angry50]

im confused by this bouncing.. can you explain a little more?

 

[Cardude99]

I am guessing your keeping the speed at just the right spot to throw off the computer combined with the grade of the hill. Try increasing or decreasing by 5mph and see if that makes a difference.

 

[smbsocal]

^

I have had it a couple times, it happens more on our Jeep SRT w/ a 6 speed. Sometimes you are right between the line of which gear is optimal.

 

[DickR]

My 18 GT w/A10 will sometimes bounce back and forth a bit after shifting into gear, usually 4th or 5th gear especially under load like up a hill. Anyone else notice this?

To answer your question: No. ;)

What speed and rpm range, shifter position, hill steepness, accelerating from a stop, regaining speed after having to slow, or simply maintaining speed, etc. ?

Since I don't have the digital dash I don't know what gear the trans is in unless I'm paddle shifting but I can certainly tell when there is a significant change in rpm and usually can feel the shifts. Have you noticed whether or not the tach (analog or digital setting) changes rpm consistent with the indicated gear changing? Also can you feel the shifting? The reason for the question is whether or not the display is indicating the actual gear based on what the pcm has told the trans to do versus is it calculating the gear based on mph and rpm. If the rpm's are very low the algorithm may not be completely accurate.

FYI the common term for what you appear to be describing is "hunting between gears". Mine doesn't do that unless I move the throttle significantly which "tells" the pcm/transmission controller that I want either more or less torque than is appropriate for the current gear.

 

[Rash]

It's hard to explain - I guess the best description would be if feels like the two gears it is shifting between are connected by a rubber band,so when it shifts there is some some slop and a little bounce back and forth instead of a tight no-slop shift. It is definitely not hunting for the right gear. It happens mostly when, in my opinion, it upshifts too early when going uphill or under strong acceleration. It's like it shifted too early and the bounces into gear. and a bit back and forth after shifting. This is in normal mode with shifter in D.

I'll try to pay more attention as to when I notice it and exactly what gears its' doing it in.

 

[DickR]

It's hard to explain - I guess the best description would be if feels like the two gears it is shifting between are connected by a rubber band,so when it shifts there is some some slop and a little bounce back and forth instead of a tight no-slop shift. It is definitely not hunting for the right gear. It happens mostly when, in my opinion, it upshifts too early when going uphill or under strong acceleration. It's like it shifted too early and the bounces into gear. and a bit back and forth after shifting. This is in normal mode with shifter in D.

I'll try to pay more attention as to when I notice it and exactly what gears its' doing it in.

FYI I have data acquisition plots which display the gear number using math and the gear ratios/tire revs per mile, OBD rpm, and gps mph. I haven't seen anything like you describe in testing but my focus has mostly been on full throttle shifts in D or S. However some has been in normal driving and nothing seems out of the ordinary. Ditto with manual shifts.

 

[5LTR550]

I had mine bounce off the rev limiter the other day getting a run in with my buddy. In sport + with it in D...... wonder if I spun a little or if the 35 profile on the rear wheels making it hit the limiter or what it was....

 

[DickR]

I had mine bounce off the rev limiter the other day getting a run in with my buddy. In sport + with it in D...... wonder if I spun a little of if the 35 profile on the rear wheels making it hit the limiter or what it was....

1st or 2nd gear with nannies on and near the limiter already?

Sounds like either wheel spin near the rev limiter caused it to hit the limiter before the pcm commanded an automatic shift or traction control made it feel similar to hitting the limiter.

35 series tires won't confuse either the limiter or the transmission calibration from my experience on both oem 40 series and RE-71R 35 series tires since they use rpm.

 

[michail71]

The owner's manual says to shift into S and/or use the paddles for hills and other such conditions.

 

[Rash]

The owner's manual says to shift into S and/or use the paddles for hills and other such conditions.

Seriously? So the new high-tech 10-speed tranny can’t handle hills on its own?

 

[michail71]

I think every owner's manual has something along those lines of inclines.

Are you driving around the Tail of the Dragon or something like that? I'm in flat territory so I'm not so lucky to get that kind of driving. There are some fun roads up there in NC. But Cary is relatively flat if memory serves me.

 

[w3rkn]

It's hard to explain - I guess the best description would be if feels like the two gears it is shifting between are connected by a rubber band,so when it shifts there is some some slop and a little bounce back and forth instead of a tight no-slop shift. It is definitely not hunting for the right gear. It happens mostly when, in my opinion, it upshifts too early when going uphill or under strong acceleration. It's like it shifted too early and the bounces into gear. and a bit back and forth after shifting. This is in normal mode with shifter in D.

I'll try to pay more attention as to when I notice it and exactly what gears its' doing it in.

Are you saying, you don't like the way the A10 is searching for gears..?

And that you feel it is bouncing between gear too much, or too many times as if searching... ?

:shrug:

 

[michail71]

I've only been on flat ground so far but most indication I have of shifts is just seeing the number change in the IC or hearing the motor. This trans is so fast and smooth it could pass for a CVT.

It may just be the adaptive process needs some time to adapt.

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