What's wrong? Under full throttle falls off then comes back
Thread Starter
7th Gear
Joined: Nov 2013
Posts: 7
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What's wrong? Under full throttle falls off then comes back
c7 under full acceleration in all gears the vette seems like it over loads, cuts out and then comes on strong. The cut out sounds like something is out of tune after every shift. seems to happen in the track mode mostly. I have the auto with the Npp exhaust. Is this normal or should I have this looked into? happens in first 4 gears I know of, going to fast to see if it happens in 5th and 6th. Trying very hard to keep my drivers license, not easy in this car I promise. any others having this occur?
Safety Car
Joined: Feb 2013
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My best guess is traction control kicking in. If your tires are cold (and less grippy), it's entirely possible that you are breaking traction under full throttle after each gear change and the car is cutting power.
Thread Starter
7th Gear
Joined: Nov 2013
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will try with tc off
hopefully the tc can be turned off and see if that fixes the problem.
Thread Starter
7th Gear
Joined: Nov 2013
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turned off tc before omgosh
turned it off and forgot, not like my c5. almost uncontrollable. Some folks got a good laugh and I learned a lesson," don't forget you turned off!" kinda of like being on ice and hit from the rear. If you get my drift. pun intended. I was lucky.
Safety Car
Joined: Aug 2012
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Several years ago about this time of year there had been a late snow which created a few areas of the road with lots of ice/ packed snow but most areas were clear and dry. I was driving my 2006 3/4 ton 4WD GMC diesel pickup into the office early in the morning and had switched in and out of 4WD several times because of the changing road conditions. Coming out of one sharp turn on a 2 lane rural road I had forgotten I was not in 4WD and accelerated a bit too hard and the truck nearly did a 180 before I caught it-since then I have been much more attentive to the little indicator LED that shows drive mode!
If you are lucky nothing really bad happens from these little oversights and if you are wise you don't repeat them
Scraping the splitter.
Joined: Jun 2005
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St. Jude Donor '13-'14-'15
http://forums.corvetteforum.com/c7-t...down-w-a6.html
I would guess it's the TC intervening unless there is an issue with your car. If they aren't losing traction, the A6 cars shift and pull very cleanly.
One of our resident trolls (who hasn't owned a Corvette in 35 years) was running around the forum a few weeks ago telling everybody how A6 cars "bog" and "hesitate" based on a 0-60 video somebody posted. Unfortunately he was ignorant of the fact that the flashing TC light was indicative of tire spin and TC pulling power.
Next time you feel this, look at the instrument cluster to see if this is happening.
Notice no drop off after the shifts...all my passes have been in "Tr"ack mode:
S.
I would guess it's the TC intervening unless there is an issue with your car. If they aren't losing traction, the A6 cars shift and pull very cleanly.
One of our resident trolls (who hasn't owned a Corvette in 35 years) was running around the forum a few weeks ago telling everybody how A6 cars "bog" and "hesitate" based on a 0-60 video somebody posted. Unfortunately he was ignorant of the fact that the flashing TC light was indicative of tire spin and TC pulling power.
Next time you feel this, look at the instrument cluster to see if this is happening.
Notice no drop off after the shifts...all my passes have been in "Tr"ack mode:
S.
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Thread Starter
7th Gear
Joined: Nov 2013
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thanks for the reply. sounds like you have a stick shift. mine definitely does not sound like that. there is for sure a fall off and growl. and then comes on like gang busters. just not smooth like that, and it's a automatic. turned the anti slip and the t/c off. still there, pretty sure the tires are not spinning at those speeds. pls keep trying to guess I will take it to the shop but hate to have the guys monkeying with a new production car.
Scraping the splitter.
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St. Jude Donor '13-'14-'15
thanks for the reply. sounds like you have a stick shift. mine definitely does not sound like that. there is for sure a fall off and growl. and then comes on like gang busters. just not smooth like that, and it's a automatic. turned the anti slip and the t/c off. still there, pretty sure the tires are not spinning at those speeds. pls keep trying to guess I will take it to the shop but hate to have the guys monkeying with a new production car.
VNAMVET's A6 car runs just like mine. No drop off, crisp shifts. You're not running it in any of the PTM modes, are you?
S.
Instructor
Joined: Jul 2013
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The stock calibration pulls a lot of timing in the shifts, it's transmission torque management. If you have the NPP exhaust, the tone is more noticeable with the valves open when this happens. This could be what you are feeling/hearing.
Melting Slicks
Joined: May 2001
Posts: 2,596
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From: East Tennessee
Mine will shift clean most of the time but other times it seems there is some torque management coming into play and it sounds like its hitting the rev limiter when it shifts - even though it shifted well before cutoff. Most likely when I really feel it there may some knock or something else pulling timing and the torque management pulling more timing makes it more obvious. Problem is with so many different modes, including the 'performance shift mode' becoming active its hard to nail down exactly whats going on just by SOTP. I havent done any data logging yet on one of these, been having fun just driving it.
As far as flooring it and feeling a hesitation, even at 70mph on a 80* sunny dry day the car will hesitate a bit if I floor it and it kicks down hard, click the traction control off and its fine. The traction control is pretty aggressive, but I have also had the tires break loose when it kicks down at 60mph on cold streets with the TC off so be careful if you turn it off.
Scraping the splitter.
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St. Jude Donor '13-'14-'15
S.
Thread Starter
7th Gear
Joined: Nov 2013
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not sure I understand? need service?
The stock calibration has been adjusted on the C7 for improved upshift speed. The C7 calibration has a "fuel cut" that eliminates torque for 100 milliseconds between shifts. This reduces shift time by up to 50% according to GM. The new calibration also allows the trans to run right to redline before upshifting (in auto mode).
S.
S.
Thread Starter
7th Gear
Joined: Nov 2013
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need attention?
Thread Starter
7th Gear
Joined: Nov 2013
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for darting in and out of traffic tap pedal then accell
+1
Mine will shift clean most of the time but other times it seems there is some torque management coming into play and it sounds like its hitting the rev limiter when it shifts - even though it shifted well before cutoff. Most likely when I really feel it there may some knock or something else pulling timing and the torque management pulling more timing makes it more obvious. Problem is with so many different modes, including the 'performance shift mode' becoming active its hard to nail down exactly whats going on just by SOTP. I havent done any data logging yet on one of these, been having fun just driving it.
As far as flooring it and feeling a hesitation, even at 70mph on a 80* sunny dry day the car will hesitate a bit if I floor it and it kicks down hard, click the traction control off and its fine. The traction control is pretty aggressive, but I have also had the tires break loose when it kicks down at 60mph on cold streets with the TC off so be careful if you turn it off.
Mine will shift clean most of the time but other times it seems there is some torque management coming into play and it sounds like its hitting the rev limiter when it shifts - even though it shifted well before cutoff. Most likely when I really feel it there may some knock or something else pulling timing and the torque management pulling more timing makes it more obvious. Problem is with so many different modes, including the 'performance shift mode' becoming active its hard to nail down exactly whats going on just by SOTP. I havent done any data logging yet on one of these, been having fun just driving it.
As far as flooring it and feeling a hesitation, even at 70mph on a 80* sunny dry day the car will hesitate a bit if I floor it and it kicks down hard, click the traction control off and its fine. The traction control is pretty aggressive, but I have also had the tires break loose when it kicks down at 60mph on cold streets with the TC off so be careful if you turn it off.
like the northstar all or none! Have done away with hesitation using this procedure.