C6 Automatic Transmission Question
Thread Starter
3rd Gear
Joined: Sep 2013
Posts: 3
Likes: 0
C6 Automatic Transmission Question
Not sure if what I'm experiencing is a protection feature or something is wrong with the transmission or its controls but I'm hoping that some of the experienced guys in here will recognize the symptom.
2008 Base Coupe 41k miles- Reprogrammed with Diablo i1000 to 93 octane canned tune with moderate shift rate added.
I drive the car in Sport mode all the time but almost never use the shift paddles. It happens with Traction and Stabilization controls at default settings (engaged).
Accelerating very hard (approx 90%) when I feel the rear tires break free I let off the accelerator just enough to get the tires to grab again and then instantly roll back into the throttle but it feels like the car is in neutral, a lot of engine RPM but zero pull. I then roll all the way out the throttle for a second and get back in the gas and off it goes pulling hard again.
Does this sound normal for this car (I've only owned it about 4 months) or am I experiencing a tranny problem?
I've tried to test all the gears individually in Sport Mode using the paddles but all the gears fell strong and pull hard.
2008 Base Coupe 41k miles- Reprogrammed with Diablo i1000 to 93 octane canned tune with moderate shift rate added.
I drive the car in Sport mode all the time but almost never use the shift paddles. It happens with Traction and Stabilization controls at default settings (engaged).
Accelerating very hard (approx 90%) when I feel the rear tires break free I let off the accelerator just enough to get the tires to grab again and then instantly roll back into the throttle but it feels like the car is in neutral, a lot of engine RPM but zero pull. I then roll all the way out the throttle for a second and get back in the gas and off it goes pulling hard again.
Does this sound normal for this car (I've only owned it about 4 months) or am I experiencing a tranny problem?
I've tried to test all the gears individually in Sport Mode using the paddles but all the gears fell strong and pull hard.
Last edited by turbomc; Feb 19, 2014 at 08:29 PM.
Thread Starter
3rd Gear
Joined: Sep 2013
Posts: 3
Likes: 0
I have not pulled the tune back out yet. I was hoping that someone would shed some light that it is a known issue not related to the canned tune.
That is on my list of troubleshooting items if I come up blank here.
Thank you for the reply.
That is on my list of troubleshooting items if I come up blank here.
Thank you for the reply.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Without a total understanding of how that tune functions, I doubt anyone here can diagnose your problem. As a general rule, people who use the canned tuning software don't know how it works. I'd suggest you go back to the stock tune. If the problem persists, I can offer an explanation. If the problem goes away, you know it's a tune issue and not the trans itself.
Burning Brakes
Joined: Mar 2013
Posts: 1,181
Likes: 234
From: Colorado
Sounds like a traction control issue, actually. Do you get a message saying it was engaged? Going back to original tune--easy enough with Diablo, sounds like a good idea. If the problem goes away, contact them.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
The one thing that makes this condition far more likely, is the fluid temperature. Until the trans temp is above 140 (160 is better) avoid any hard acceleration, due to longer times needed to complete shifts.
So the bottom line is don't play hard with cold fluids and if you get wheelspin, either drive through it or take the safer approach and back out completely.
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Pro
Joined: Jul 2013
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I had a similar issue on my '13 A6. I had a tune on it at the time and the issue was similar to what you said - I would lift between the 1-2 and then it would rev out on the 2-3 as if it was going to neutral.
see here: http://forums.corvetteforum.com/c6-s...en-shifts.html
Brought it to my tuner after I noticed this issue and he made some adjustments which have eliminated the issue. I honestly don't know what he changed, and even if I did I don't think I'd be much help as I haven't ever messed with HPTuners.
Not sure what transmission options you have in the Diablo tuner, but in my experience a quality dyno/street tune from a reputable shop who will drive your car and get it exactly where you want it is worth the extra cost incurred.
see here: http://forums.corvetteforum.com/c6-s...en-shifts.html
Brought it to my tuner after I noticed this issue and he made some adjustments which have eliminated the issue. I honestly don't know what he changed, and even if I did I don't think I'd be much help as I haven't ever messed with HPTuners.
Not sure what transmission options you have in the Diablo tuner, but in my experience a quality dyno/street tune from a reputable shop who will drive your car and get it exactly where you want it is worth the extra cost incurred.