travbjork

I searched around a bit and couldn't find a good answer. I do understand fundamentally the difference between a true manual and the A6 but would like y'alls experience.

I don't really notice this effect in Automatic or A-Sport mode (as I'm sure the computer is a wizard).

When I put my C6 into M-Sport mode with the paddle shifters, I typically shift like I would my Manual C5 (just without the stick, obviously)

I find that in Paddle mode, if I get on the gas (let's say to the floor) in 3rd/4th/whatever it loses RPM's sometimes and feels like it revs up and then whines out for a little bit. Is this due to the nature of the slushbox or torque conversion or what?

Also, downshifts don't seem to truly downshift, where it doesn't rev match. Almost as if it's in neutral in the next lowest gear.

In my C5 Manual, if I drop into third and gun it, she just goes, she's mechanically sealed, angry and stuff!

Thoughts? Does this make sense? Haha

Thanks for entertaining me!

Vette_DD

A6 paddle shifter does do a rev match when shifting to lower gears, but it has not been that way for every model year. Not sure when the rev matching started, but it does it on my 2012.

https://www.corvetteforum.com/forums...post1557441410

Don't know if that's true or not.

I could not find anything about it in the Corvette Black Book.

hrt vlv

I too have the A6 when using the paddles it does not seem to like it when you shift up from full or almost full throttle. So I do not shift it that way, around 5000 RPM is my shift point when paddling it. If I am letting it be an automatic, then the computer does full throttle shifts just fine.

windyC6

First and foremost, its not advisable to try and compare a C6 manual with a C-6 with paddles. Contrary to what you hear from some of the people in these threads it is not "ALMOST" the same as driving a manual. The people that say this usually are just to bias to admit that there paddled automatic isn't the same as a manual. Mine has an auto and I like it for what it is, but The paddles are really no more than a novelty. They don't make the tranny shift any quicker or harder than what a car with a typical console auto shifter does. You can however buy conversions to help the paddled tranny work better, so they say on this forum anyway. Bottom line is if you're trying to get your paddles to work like a manual....forget it.

travbjork

I'm not trying to make my C6 A6 drive like my C5 M6. I do prefer to have full control over my gear selection and so far I've been getting better MPG. I read a million A6 posts before deciding on buying my automatic.

What this thread is about, is the way the automatic while in paddle modes handles driving, load, acceleration, etc.

I'm really talking about it revving weird. I'm cruising in 5th gear at 60mph and I gun it, it'll get spritely and then drop revs a bit, almost like it got stuck in the mud.

Is there some kind of overdrive for each gear?

For example, when I go from:
60MPH and coasting with no throttle... 5th Gear to 4th Gear - It'll match revs briefly, and then drop to idle (like ~1000 RPM)

Downshift again from 4th to 3rd, it'll blip and then again, drop to idle.

I haven't owned an auto in a few years, I'm really just trying to understand exactly how it works, what's happening, etc.

Any ASE Transmission guys out there? Corvette specialists?

WA 2 FST

Not sure what year your car is, or if it really matters... but once I got my trans tuned, the paddle shifting is much better. It is more precise (shift quality), quicker (shift speed), and at WOT it is near instantaneous. I no longer have to worry about hitting the rev-limiter b/c I have to _guess_ as to when the trans will actually shift after I upshift with the paddle. It shifts on command. I was completely shocked.

Of course, you can just leave it in Sport Auto and the trans shifts great that way, too.

As windyc6 says... you cannot really compare it to a manual. I have two manual trans vehicles, and it is different in how the driver engages with the car. However, with a good trans tune (which includes better shift-time with the paddles), I have changed my impressions about the A6.

travbjork

Oh, sorry everyone. It's a 2008 3LT Auto, with 4500 miles FWIW.

I'm planning a tune but was just looking for insight as to why it revs the way it does when gassing it in a gear. Not worried about the speed of the shift or anything in this particular thread.

Dano523

GM tunes the trans to save the drive line, hence soften the shifts.


All this can be changed in a tune, and you can change both the standard mode, and S mode (pattern B) , or leave one stock and just change the other.

hrt vlv

I agree you cannot compare an m6 to an a6. For my driving style it works for me. Street driving is far different than track use. I do not drive at 100% on the street. 70% is about my limit for surviving situations. As Dano said you can do a tune, but I don't want to trash a transmission or other driveline componant . I can work around a factory tune. I am to a point in life were I am able to wear my "GOT OLD" T-shirt with pride.
Bill

travbjork

Alright everyone, can we get back to the topic at hand now please?

In any gear using the paddles, let's say 6th gear on the highway doing 60-70

If I step on the gas (not flooring it), it seems like the transmission is de-revving itself, almost like it's shifting into an overdrive. This may be accelerating from 60mph-75mph

Is this a normal thing?

TerryL

I would say NO! My 06 A6 vert does not respond that way. When I floor it or just accelerate, it accelerates, period. It does have a power cut when it hits the rev 'limiter' however but that's in the 6,000 rev range.

Dano523

GM throttle mapped a delay from the gas pedal response, to the TB doing anything itself.

This keeps you from bucking the car via the gas pedal, and achieving higher MPG. Worse yet, when you come off the gas pedal on the base cars, the motor will hold it revs for a moment as well before the engine rev's will start to drop down (same reason).

So keep in mind that the throttle is not going to be instant on the Vet (unless the throttle is remapped).

So after this short throttle delay of nothing happening as you press the gas pedal more down, does the revs start to climb, trans starts to shift down with the torque converter de-locking for the shift?


Also keep in mind that the motor is in closed loop, So if your air filter is dirty/you changed out to an after market intake that is wreaking havoc on a smooth flow of air past the MAF, will cause a slightly longer delay as well.

Lastly, data log the gas pedal and the TB sensors. Normally the car will throw codes if the gas pedal sensors have a problem, but could have a bad spot in the gas pedal sensor and instead of the ECM seeing the gas pedal as being depressed farther down, could be seeing the pedal being pressed down as being slightly lifted instead.

Vette_DD

That's the way my 012 responds.

Rod Stewart

Something does not sound right.
In my '06 LS-2 A6 vert, if I am cruising at say 60 (~1350 rpm in 6th) and I step on it to pass, even moderately, it immediately shifts down to 5th, and perhaps even 4th, and quickly accelerates to 80+.
What yours is doing does not sound right at all.

travbjork

To clarify, I'm cruising in 6th in Paddle Mode. I'm pressing the gas to speed up without shifting.

Rod Stewart

if you know the original owner, you may want to call and ask him if there was any kind of aftermarket tuning done to the car. If so you might want to pay a dealer to download the original OEM tune, so at least you know where you are starting from.

Rod Stewart

When I drive in sport/paddle mode, I simultaneously downshift using the paddles when I step on the peddle to pass. so I am not sure if what yours is doing is normal in paddle mode.
What happens if you step on it in normal auto mode?

travbjork

Everything else is perfect, no problems, hard shifting, nothin'.

I only don't downshift in the 60-75 situation because it's typically just going with traffic, not so much being aggressive.

I really think it's just an automatic transmission thing. In my manual, if I'm cruising at 60 in 6th @ 1300rpm* and accelerate to 75 in 6th @ 1425rpm* it stays there. (I'm guesstimating RPM)

In the automatic in paddle mode 6th gear, it goes from cruising RPM and drops to idle RPM, like it's just chillin' waiting for throttle input.

If none of this makes any sense, I'll try and get some video up. Nothing seems wrong, I just wanted to know why it would *technically* do that haha

Rod Stewart

That just does not sound right.

travbjork

For everyone who is apparently now concerned, I have a 30k mile/3 year, bumper to bumper warranty lol, so I'm fine taking it in.

If you really think this warrants a check-up, let me know.

If not, go drive your A6's tomorrow and let me know what they do after setting cruise control or accelerating 50%+ throttle without shifting up/down.