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Old 07-09-2013, 08:58 AM   #1
roSSco
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A6 shifting way before redline - even in PTM5?

I recently went to the dragstrip in my ZL1 and it was quite disappointing. My best time was 12.61 with a 1.8 60' Two other runs were 12.8x MPH was 111.

I had a dash cam running for 2 of the runs and it sure sounds like it was shifting way early on the 1-2 and 2-3 shifts.

I admit I wasn't watching the tach, but I was in PTM5 and Sport mode for sure.

I have worn out Google and the search function here, but was wondering if anyone was aware of this issue.

I have not made any follow up runs yet to watch the tach during a repeat, but am pretty sure this is the case.

Watch one of the videos and let me know what you think. (right click on links, save)

http://www.anotherls1.com/ZL1/1373080689921.3gp

http://www.anotherls1.com/ZL1/1373081842122.3gp
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Old 07-09-2013, 11:16 AM   #2
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I thought you Autos didn't have PTM.
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Old 07-09-2013, 11:23 AM   #3
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Quote:
Originally Posted by 2012-1822 View Post
I thought you Autos didn't have PTM.
It's the convertibles that don't. Autos do.
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Old 07-09-2013, 11:51 AM   #4
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Hard to tell from watching your video. I'd do a run in your favorite testing area and see where it shifts. I believe there have been some posts saying the auto shifts before redline, but redline may not be the optimal shift point for the auto.
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Old 07-09-2013, 12:32 PM   #5
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I can certainly tell you that at WOT the auto will and does shift at 5900 rpms.
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Old 07-09-2013, 12:35 PM   #6
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You have to remember also the tach is not moving as fast as the engine is. So it may be 300-500 rpm behind the engine at WOT.
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Old 07-09-2013, 12:35 PM   #7
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In mode 5 the car still controlls some functions, try with all nannies off and see if it does it.
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Old 07-09-2013, 01:00 PM   #8
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Quote:
Originally Posted by Scott@Bjorn3D View Post
You have to remember also the tach is not moving as fast as the engine is. So it may be 300-500 rpm behind the engine at WOT.
This is also correct info. same thing a good tuner will tell you. about 500 is a good measurement.
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Old 07-09-2013, 02:11 PM   #9
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I saw an article that said the transmission shifts at 5800 in Drive and 6000 in Sport mode.

Found the article.
http://www.gmhightechperformance.com...1/viewall.html
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Last edited by roSSco; 07-09-2013 at 02:46 PM.
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Old 07-09-2013, 02:30 PM   #10
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Quote:
Originally Posted by roSSco View Post
I saw an article that said the transmission shifts at 5800 in Drive and 6000 in Sport mode.

Sent from my SAMSUNG-SGH-I317 using Tapatalk 2
Interesting, does anyone know if you turn the nannies off this still applies?
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Old 07-09-2013, 02:54 PM   #11
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Quote:
Originally Posted by Scott@Bjorn3D View Post
You have to remember also the tach is not moving as fast as the engine is. So it may be 300-500 rpm behind the engine at WOT.
This is true. The Tachometer will lag slightly behind.

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Old 07-11-2013, 08:57 AM   #12
roSSco
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I did the DA calculations and discovered it was around 3000' which translates into a 12.14 @ 114.9. Not too far off the mark for a stock ZL1.

What a relief!
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