DAC17

I have a strange issue with my 2019 M7 Z06. When accelerating moderately from second to third, when I release the clutch and apply throttle, the car will sort of "stutter" (almost like the gear is not quite engaged, but it clearly is). After a second or so, it goes on its merry way. No issue with any other shift.

Anyone else have this, or ideas as to what might cause it??

Thanks.

madrob2020

Not questioning your abilities but we do get a lot of newbie questions, so bear with me. Are you by chance shifting too soon (very low speed/low RPM)? Our cars have a tremendous amount of early, low end torque, but can still be induced to lug.

DAC17

No; this occurs around 35-45 mph. I've owned seven Corvettes in the past, so I understand lugging....

And BTW, "newbie"?? Did you see my history with the forum??

madrob2020

Maybe "Newbie" to M7, I didn't know. Some here have switched to the Manual to avoid A8 "problems". I was trying to apologize before responding (with the "bear with me") comment to not **** you off. Seems I still upset you. Sorry I tried to help.

DAC17

cyi1

Does it only happen with active Rev match on?
The car's electronics has weird low speed throttle behavior.

DAC17

fishpick

That's "low speed" for these cars...
and it's not really wheel speed that matters for lugging so much as RPM's for the gear ratio you are heading into.

Sounds like you figured it out tho... probably RPM's @ shift and rev match making things seem "weird"... computers outsmarting us every single day!

Zjoe6

cyi1

Yep. I bet if you try without active rev match on, the acceleration is smoother and more precise.

It's just how the active rev match behaves.

bcmarly

I just drove my Z07 to try and replicate your issue and was not successful. Your stumble/stutter is not normal.

Z0HS1CK

Almost 11k miles on my '16 and i never had that issue. And the past year or so, i always put the rev match on whenever i get in the car. It becomes almost natural now.

Before my PTB and after, never had a stutter.

Bill Dearborn

Gong from 2nd to 3rd at 35 to 40 mph isn't a lugging situation. Hell, I go from second to third before 25 mph and am in 4th by 30.

How you letting out the clutch? More of a snap? If so you may be getting a little traction control action on the shift if the tires tend to slip a little as the cltuch is let out. If you have PTM put the car in Track, Sport 1 Mode which turns off traction control but leaves on active handling and performance traction management and see how it reacts. If it still does it try Sport 2 mode which also removes stability control and just leaves PTM.

Bill

DAC17

Good suggestions; I'll try that. You may be right that my definition of "moderate throttle" may be enough to momentarily break loose. Haven't had the issue in other gears, though.

Oneslackr

I also tried to replicate your issue & my car doesn't stutter in the gears & at the speeds mentioned, whether or not I had rev match on. I hope you find a solution to the issue.

dvilin

Have not experienced that problem, would say it is not normal but unfortunately have no idea what can be wrong.

DAC17

Tennispro1986

Sounds like an issue with me. If you know how to shift and are not doing anything wrong on your part, then it sounds like something is wrong. Mine shifts perfectly in all gears, including 2-3. Keep us updated and good luck

Oneslackr

Any update on your car?

DAC17

Yes; sorry for not sending it sooner. Went to the dealer on Wednesday. They couldn't duplicate it, so I did. Apparently it only happens on a certain section of pavement that I drive every day. Must be a lower coefficient of friction. Tried it on several other roads, and it didn't happen. All is well; apparently "operator error".... Thanks for asking.