Pop when shifting?
Thread Starter
Pro
Joined: Mar 2006
Posts: 644
Likes: 72
From: EAST TEXAS
Pop when shifting?
Last night I took my 2016 LTI, A8 out to really see what it feels like for the first time. I've been careful with it during break in and wanted to see how it performs at WOT. In sport and track modes, with WOT shifting, at the shift I hear a pop or bang from under the car. Do not notice it in tour mode. Seems to be audible more than mechanical and no other after effects noticed. Any one else experience this or have any ideas what it is?
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
There is a very short ignition shutoff at the moment the shift takes place. Briefly interrupting power flow allows the shift to be completed very quickly while simultaneously reducing wear to the transmission clutches. The pop (and sometimes bang) is unburned fuel (a VERY small amount) hitting the cats and does not cause a problem for them.
Last edited by NSC5; Sep 11, 2015 at 03:44 PM.
Racer
Joined: Jul 2014
Posts: 281
Likes: 0
I have a 16 a8. Still in break in mode so haven't experienced yet. I will say that this seems cheesey. I love my vette. It's my second one in one years time but this scenario just doesn't seem to reflect the over all quality of this vehicle. I guess I need to experience it before I judge it but.....
Racer
Joined: Sep 2015
Posts: 434
Likes: 67
From: Upper Marlboro MD
Its normal behavior when shifting under WOT. 100ms kill time for fuel to allow quick full throttle shifting.
I used this same type of setup on all of my race bikes Air Shifter kills ignition or fuel.
I used this same type of setup on all of my race bikes Air Shifter kills ignition or fuel.
Racer
Joined: Apr 2015
Posts: 295
Likes: 109
From: Crockett Tx
I have a 16 a8. Still in break in mode so haven't experienced yet. I will say that this seems cheesey. I love my vette. It's my second one in one years time but this scenario just doesn't seem to reflect the over all quality of this vehicle. I guess I need to experience it before I judge it but.....
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Team Owner
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From: Chirper Island
Le Mans Master
Joined: Sep 2012
Posts: 7,146
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From: Hagerstown MD
St. Jude Donor '15-'16,'18
I experienced my first WOT shift tonight in my '16 A8 whe getting on the interstate after a car show. Holy crap! Reminded me of the sound the IMSA GTLM cars make on the track. I luv this car!!
Race Director
Joined: Jul 2000
Posts: 10,777
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I have a 16 a8. Still in break in mode so haven't experienced yet. I will say that this seems cheesey. I love my vette. It's my second one in one years time but this scenario just doesn't seem to reflect the over all quality of this vehicle. I guess I need to experience it before I judge it but.....
Drifting
Joined: Jun 2013
Posts: 1,764
Likes: 10
From: Cumming GA
On order: Torch Red Z51
My 2014 A7 Z51 with nearly 22K on her now has done that since the 1st time I went WOT after break-in. And yes, you're spot on with the explanation so it's just something we can all enjoy during those precious moments .
. There is a very short ignition shutoff at the moment the shift takes place. Briefly interrupting power flow allows the shift to be completed very quickly while simultaneously reducing wear to the transmission clutches. The pop (and sometimes bang) is unburned fuel (a VERY small amount) hitting the cats and does not cause a problem for them.