A nice explanation of the ZF 9 Speed - Acura TLX Forum
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post #1 of 24 Old 01-15-2015, 04:02 PM Thread Starter
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A nice explanation of the ZF 9 Speed

That hard shift from 1-2 or 2-3 and the heartbeat delay when flooring the accelerator when trying to pass - in ECO, DRIVE, or SPORT. Well read on....


ZF's 9-Speed 9HP Transmission Puts Dog Clutches On The Leash - The Truth About Cars

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post #2 of 24 Old 01-16-2015, 10:12 AM
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Excellent read!

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post #3 of 24 Old 01-17-2015, 11:54 AM
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My faith and understanding has been restored as I now understand the reason for the abrupt shifts in low gears due to the dog clutches. Well worth reading.
I just hope the 9 speed transmission is reliable, as some of the early ones are due for a recall (due to park engagement).
It also explains why I've not yet seen 9th gear.
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post #4 of 24 Old 01-17-2015, 03:54 PM
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Thanks for posting this. A good and informative read. Enlightening.
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post #5 of 24 Old 10-03-2015, 06:49 PM
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I can't believe I missed this post. It's an interesting read on what is going on with the 9 speed.
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post #6 of 24 Old 10-04-2015, 12:13 AM
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You know...I used to see the hard 2/3 shift as a nuisance. Or rather I should say it was annoying because I was always anticipating it. I've had the car for 3 months now and I drive it almost everyday. I've either gotten used to the hard shift, it's really not that bad in general and I was just influence by all the post I've been read on TLX forums.

To simply put. I love everything about my TLX.
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post #7 of 24 Old 10-04-2015, 12:23 AM
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I just read that website as well. Didn't know the ZF 9HP had such a problem. Kind of shocked to see that the ratios are like that, having 5th as the 1:1 ratio instead of 6th. Why bother making a 9 speed automatic if we can't utilize it to the full potential? I wonder why Honda didn't use the Aisian 8 speed automatic used by Volvo.

I'm trying to understand what the author wrote and I have an idea idea on how the automatic transmission works now. However that doesn't explain the rougher 2-3 upshift does it? Since 2-3 uses the traditional friction brake and clutch elements, whatever that is. That's the only rough shift I can feel. Everything else felt good I think? Also according to my friend, this means the ZF 9HP would never shift as smoothly or rapidly as the 8 speed DCT developed by Honda or Aisin 8 speed automatic for example?

Edit: Car and Driver Explores the ZF 9HP as well.

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Last edited by geokilla; 10-04-2015 at 12:26 AM.
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post #8 of 24 Old 10-04-2015, 10:02 AM
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Wondering if the hard shifts could be related to a heavy foot on the gas? I find the throttle to be more on the sensitive side and can see light occilations of the pedal cause some transmission fluctuations.

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post #9 of 24 Old 10-06-2015, 03:06 PM Thread Starter
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Alex does a fantastic job on explaining the 9-Speed Transmission

https://www.youtube.com/watch?v=Z7EMGnjEhmE
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post #10 of 24 Old 10-07-2015, 12:28 AM
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So how come gear 2-3 is so "rough" if it doesn't involve the dog clutches? That's the only gear shift I find that is not very smooth while all other 8 gear changes are pretty smooth overall.
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