AFM Question
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Safety Car
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From: USA
AFM Question
Is there any way other than tuning the car to get rid of the cylinder de-activation? On my Stingray I used a Diablosport tuner which allowed me to get rid of this annoying feature, but since I don't want to tune my new Z06 I was just wondering if there were any other solutions or ways to bypass it. Thanks.
Last edited by BMadden; Apr 24, 2017 at 06:04 PM.
Le Mans Master
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From: N. CA
Le Mans Master
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What annoys you about it? I have to have the display up to know if it goes into V4, I can't tell. And it happens very rarely under pretty stringent requirements (speed, incline, gear, load, etc) anyway...
Why do people disable it? If I could have ordered the car without it I would have just to avoid the complexity of it, but it doesn't bother me in the slightest, and don't get what bugs people. Not saying they're wrong, just that I don't get it.
I can sometimes hear a coast-down rumbling sound that I assume is related to V4, but that's really the only thing I can notice.
Why do people disable it? If I could have ordered the car without it I would have just to avoid the complexity of it, but it doesn't bother me in the slightest, and don't get what bugs people. Not saying they're wrong, just that I don't get it.
I can sometimes hear a coast-down rumbling sound that I assume is related to V4, but that's really the only thing I can notice.
Last edited by davepl; Apr 24, 2017 at 07:23 PM.
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Doesn't bother me enough to want to disable it. The transition between 4 and 8 cylinder operation is pretty much seamless, aside from a minor change in the sound.
OP, what is it that you would like to accomplish by disabling the feature?
OP, what is it that you would like to accomplish by disabling the feature?
Last edited by Warp Factor; Apr 24, 2017 at 07:38 PM.
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Thread Starter
Safety Car
Joined: Dec 2003
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From: USA
That weird "fluttering" sound is the only thing that really bothers me. It was much more noticeable on my Stingray than it is on the Z06, but the Diablo tuner eliminated it completely which was nice. I'll probably just get used to it, but was wondering if there was any kind of bypass.
Le Mans Master
Joined: Sep 2000
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From: N. CA
That weird "fluttering" sound is the only thing that really bothers me. It was much more noticeable on my Stingray than it is on the Z06, but the Diablo tuner eliminated it completely which was nice. I'll probably just get used to it, but was wondering if there was any kind of bypass.
Couldn't be happier!
Last edited by BOBSZ06; Apr 24, 2017 at 08:03 PM.
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Le Mans Master
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From: Metro Detroit Michigan
Funny thing about human nature:
If cylinder deactivation didn't come factory stock, I bet people would be stumbling all over themselves to buy an expensive aftermarket add-on to accomplish the same thing.
If cylinder deactivation didn't come factory stock, I bet people would be stumbling all over themselves to buy an expensive aftermarket add-on to accomplish the same thing.
Last edited by Warp Factor; Apr 24, 2017 at 08:16 PM.
Instructor
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The only thing other than the flutter issue is uneven engine wear. From what I understand, the same 4 cylinders are always shut down when 4 cylinder mode is active. This may or may not be as much of an issue in a Z06 as compared to Stingray, but I for one have the Range disabler installed on my Z06.
I dont have any hate for those that want to have the option of 4 cylinder mode; I also dont have issue with GM spending development money on this technology vs. some actual performance benefit on the car... I think what annoys me about it is I feel it should be an easily selectable/configurable option on the car vs. something that is forced on everyone in a static state. Or if making it independently customizable is too much to ask, why not limit it to ECO mode?
I guess my point is they could have made this a real "feature" on the car with no downside and they missed that opportunity.
I dont have any hate for those that want to have the option of 4 cylinder mode; I also dont have issue with GM spending development money on this technology vs. some actual performance benefit on the car... I think what annoys me about it is I feel it should be an easily selectable/configurable option on the car vs. something that is forced on everyone in a static state. Or if making it independently customizable is too much to ask, why not limit it to ECO mode?
I guess my point is they could have made this a real "feature" on the car with no downside and they missed that opportunity.
Last edited by IM3CPO; Apr 25, 2017 at 02:02 AM.
Safety Car
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In addition to the possibility of uneven engine wear with the A8 you also have the strategy GM uses in AFM/V4 mode to reduce the transmission of engine vibration via rapidly modulating the torque converter mechanical lockup clutch. The ability to absorb some vibration via the torque converter is what makes it "acceptable" to have AFM active far more often with the automatic and not just when the owner explicitly chooses eco mode like with the M7 equipped Corvette. Fortunately AFM is far less
frequently active with the Z06 compared to the regular Stingray which probably is what accounts for seeing the large number of torque converter issues and replacement torque converters in the Stingray but not in the Z06.
I bought a Range module shortly after buying my Z06 in 2016 but that version of the Range would sometimes set a DTC at startup because it interfered with communications between the ECM and TCM resulting in the A8 staying in 4th gear only in drive or manual mode; a restart did reset the issue. I need to send the Range in for an update but have grown used to driving in manual mode (which prevents AFM) so I haven't bothered to send the Range back yet.
frequently active with the Z06 compared to the regular Stingray which probably is what accounts for seeing the large number of torque converter issues and replacement torque converters in the Stingray but not in the Z06.
I bought a Range module shortly after buying my Z06 in 2016 but that version of the Range would sometimes set a DTC at startup because it interfered with communications between the ECM and TCM resulting in the A8 staying in 4th gear only in drive or manual mode; a restart did reset the issue. I need to send the Range in for an update but have grown used to driving in manual mode (which prevents AFM) so I haven't bothered to send the Range back yet.
Last edited by NSC5; Apr 25, 2017 at 08:43 AM.