[DannyK]

I have a 2014 2LT W/ Z51 automatic transmission. I'm not sure I have a problem but I have noticed that when I floor it in manual or drive mode it upshifts before it reaches redline. It upshifts around 5300 rpm. Shouldn't it upshift at redline which is 6500 rpm.

 

[tmcternan]

I have a 2014 2LT W/ Z51 automatic transmission. I'm not sure I have a problem but I have noticed that when I floor it in manual or drive mode it upshifts before it reaches redline. It upshifts around 5300 rpm. Shouldn't it upshift at redline which is 6500 rpm.

Based on past experience without actually being there, there are probably several explanations for it, the most likely of which is the fact the tachometer is electronic. It's not uncommon for the needles on electronic tachometers to lag behind somewhat, however 1200 RPM's does seem a bit excessive. I'm sure there are a few engineers in electronics in the forum that can provided a more detailed explanation for the phenomenon.

 

[mjw930]

How many miles on the car and what mode were you in?

 

[DannyK]

I have 1100 miles on the car. It does it in track, sport and touring modes.

 

[mjw930]

How many miles on the car and what mode were you in?

I have 1100 miles on the car. It does it in track, sport and touring modes.

Then it doesn't sound correct. Also, I'm 99.999% sure it's not a lag in the electronic "needle" on the tack, it refreshes in milliseconds.

Check and make sure your floor mat isn't blocking the accelerator pedal. If it's not fully depressed the e-throttle won't register WOT.

 

[jsvette]

DannyK, have you noticed this only when you have gotten into the Vette and the engine is cold? The OBC limits the revs and lowers the red line until everything is up to temp. When RedHot starts out the red line is moved to about 3800 to 4000 rpm and moves up as the engine et al reach operating temperature.

 

[akpancake]

or it could be that they want the transmission to shift at "peak" HP & torque, as to keep the car pulling. Redline isn't where your best performance is at, that is where the maximum safe level of operation is.

 

[Mobius]

or it could be that they want the transmission to shift at "peak" HP & torque, as to keep the car pulling. Redline isn't where your best performance is at, that is where the maximum safe level of operation is.

I previously posted a youtube video of a dash recording of a C7 A6 doing a 1/4 run. The dash (track mode) clearly showed A6 shifts before redline at WOT. Estimates of the 0-60 and 0-100 times could be made from this video, and they were close to published performance data.

Unfortunately, my posts that referenced that video have been deleted, presumably since the moderators concluded that these were not videos taken during a sanctioned track event, and I haven't got the time to search through the thousands of C7 videos on youtube to find it (besides, it would just get deleted again!).

 

[DannyK]

Yes, I understand that could be possible in drive, however when in manual I should be able to take it to 6500.

 

[jsvette]

Yes, I understand that could be possible in drive, however when in manual I should be able to take it to 6500.

You should if all relevant temperatures are at normal operating range per my earlier post.

 

[DannyK]

It does it when the engine is warmed up, I wouldn't test it on a cold engine. I mentioned it on here to see if anyone else was having the same issue. At WOT can you take it to redline? What rpm does it shift?