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Old Jul 31, 2024 | 10:54 PM
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Default C7 engine

2019 c7 z06 (A8) when I rev engine (for my kids) while in park it takes awhile to come back down to normal. When rev in neutral it works accordingly.

Anyone know what's up.

Also I've tried absolutely everything I've read and seen on how to do launch control. It just won't work. Engine sounds like it's stalling out. Like revs up, then down and chokes (crackles)
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Old Aug 1, 2024 | 11:39 AM
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Perhaps torque tube inertia?

With the M7's the recommendation is to not rev it in neutral. Doesn't that apply to the A8's too?
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Old Aug 1, 2024 | 11:51 AM
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Originally Posted by AnotherNorskie
Perhaps torque tube inertia?

With the M7's the recommendation is to not rev it in neutral. Doesn't that apply to the A8's too?
Not revving like crazy, just like tapping pedal. Quick braaaap
braaaap
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Old Aug 1, 2024 | 12:01 PM
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Have read this before on another forum.. this was their take:

On further investigation it's known as "rev hang". It was mentioned by Edmunds in their long term 2014 corvette write up. According to them it's possibly an emissions thing but feel if enough people think it's an issue GM may issue a
re-calibration of the ECU.

I think it's because the engine isn't "drive by wire."
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Old Aug 1, 2024 | 01:40 PM
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I thought maybe cause I had it tuned (professionally) but I don't Thi k that's the problem. It may very well be a GM issue. Mine is a 2018
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Old Aug 1, 2024 | 01:53 PM
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Originally Posted by Kent Rankin
I thought maybe cause I had it tuned (professionally) but I don't Thi k that's the problem. It may very well be a GM issue. Mine is a 2018
Mine does it too. In fact, nearly every GM car I've owned does it. Definitely a GM thing.
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Old Aug 1, 2024 | 03:21 PM
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Originally Posted by ZO6LIFE
Mine does it too. In fact, nearly every GM car I've owned does it. Definitely a GM thing.
Really eh?
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Old Aug 1, 2024 | 05:11 PM
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Originally Posted by AnotherNorskie
With the M7's the recommendation is to not rev it in neutral. Doesn't that apply to the A8's too?
I have an M7, can you elaborate on the recommendation? I'm not being snarky at all, I honestly haven't heard that before.



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Old Aug 1, 2024 | 08:55 PM
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I wonder if those with the soler throttle controller have resolved the rev hang
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Old Aug 2, 2024 | 06:07 AM
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Originally Posted by blueray16
I wonder if those with the soler throttle controller have resolved the rev hang
Solar Throttle controller?
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Old Aug 2, 2024 | 08:31 AM
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Originally Posted by Flattman
I have an M7, can you elaborate on the recommendation? I'm not being snarky at all, I honestly haven't heard that before.
I don't recall where I read it - I believe it has something to do with spinning up the TT when not under load.

Better to just push in the clutch and then do it.
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