3.3T Ride bumpy at 25-35 mph while accelerating

[Dano158]

Hi all! I'm new to the forum, but joined because I love my G70 3.3t Sport (black on black) and wanted to be around others that love their G70 just as much as me. I recently purchased it with about 11,250 miles on it and it has been a dream to drive. I have just over 12,500 miles on the car now.
That said, I have been noticing while accelerating at around 25-35 mph, the car becomes a bit jerky and almost feels like I am on a bumpy road but the road is completely smooth. This is most noticeable when riding on residential roads and accelerating at a normal pace. When I give it the beans, I do not feel it at all. It is just when accelerating at a normal pace. I also don't feel it when at higher or lower speeds.
Has anyone else experienced this them self or heard of others experiencing this? Should I get my transmission flushed?

 

[videopho]

Mine is only 600 miles and I know exactly what you described.
I concur too that it is most pronounce at 20-30 mph as you stated. A minor pulsating sensation is what I can describe.
Nothing nuisance about it but I was debating whether the sport suspension is doing its thing?

 

[Dano158]

Mine is only 600 miles and I know exactly what you described.
I concur too that it is most pronounce at 20-30 mph as you stated. A minor pulsating sensation is what I can describe.
Nothing nuisance about it but I was debating whether the sport suspension is doing its thing?

Exactly. Nothing nauseating just a little bit of a stutter, pulsating sensation. I'm usually driving around that pace since I drive around the city a lot.

 

[Ernie3647]

Why not try different drive modes and see it stays the same.

 

[Dano158]

Why not try different drive modes and see it stays the same.

I have tried sport mode and it is less noticeable, but I would prefer not to always have to put it in sport mode everytime I start the car. I would like it to be smooth in comfort mode and sport can be much more bumpy.

 

[TinsleyC]

Does it go away when the car warms up? Just wondering if it's similar to the flutter issue that G80's have.

 

[Toddasaurus]

Anyone brought this up with their dealer?

 

[Dano158]

Does it go away when the car warms up? Just wondering if it's similar to the flutter issue that G80's have.

It is a bit less noticeable when the car warms up, but I still notice it some.

I didn't realize the G80 has something similar. Is it normal or is there something that can be fixed?

 

[50jae]

It is a bit less noticeable when the car warms up, but I still notice it some.

I didn't realize the G80 has something similar. Is it normal or is there something that can be fixed?

It may be different from the 2015-16 Genesis which was just a sound and not a bumpy ride. That was due to a faulty propeller shaft.

 

[EarlsG80]

yep, my 3.3T G80 does the same thing. Just a quirk of the 3.3T I think, just like the slight vibration issue that engine has at different RPMs.

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[videopho]

Cold engine in coupling with Sport mode making it more pronounce I think?
I need to experiment at several variations to see there is a pattern.

 

[TinsleyC]

It is a bit less noticeable when the car warms up, but I still notice it some.

I didn't realize the G80 has something similar. Is it normal or is there something that can be fixed?

The jury is still out on this, but latest testing by member "arcman" shows that the vibration is from the flex joint on the driveshaft. Apparantly it hardens up when cooling, and when driven, it doesn't flex back all the way causing vibration. Great thread on it here. Read post #1 and #6, among others.

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