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 |
I thought you Autos didn't have PTM.
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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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I can certainly tell you that at WOT the auto will and does shift at 5900 rpms.
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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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In mode 5 the car still controlls some functions, try with all nannies off and see if it does it.
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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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Best regards, Tyler 888-308-6007 |
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! :biggrin: |
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