C7 Active Fuel Management: 4-cylinder mode - tuning this out?
12-26-2013, 10:08 PM
#21
Advanced
I was ready to purchase the T-1000 to remove the AFM. However I spoke to the service manager at my dealer who said " it will positively void the warranty". Now I have second thoughts and will probably stay with the AFM.
12-28-2013, 07:47 PM
#22
"AlohaC5" Senior Member
Thread Starter
What if you tune AFM out and then return the tune to stock only when you bring the car into the dealership for services; and then upload the AFM delete tune after they're done?
12-28-2013, 08:59 PM
#23
Advanced
According to the service tech as soon as you connect the T-1000 the computer knows you have done it and the warranty is voided. I had asked the same question as you did. Not happy with the answer. Possibly he is incorrect? If so the AFM would be gone. Anyone have additional info?
12-28-2013, 10:41 PM
#24
Its terrible you have to buy the tuner to turn it off. As long as you keep your stock exhaust you can probably live with the AFM until you are out of warranty. I just don't like the complexity of the lifter setup. Just more things to possibly cause problems. A stick shift was out of the question for me but the should have given the auto owners the choice to only have AFM when in ECO mode and turned it off in all other modes including tour
12-29-2013, 01:56 AM
#25
Tech Contributor
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St. Jude Donor '14-'15
2) Talk to DiabloSport directly. Their product does not change the write counter or alter the CVNs that I know of. Same with Pfadt. So long as the tune is removed before returning to the dealer, there should be no way to see any new calibrations written when scanned with GDS/Tech3. Too much to go into here...
Last edited by Theta; 12-29-2013 at 01:58 AM. Reason: Typo
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05-24-2015, 01:30 AM
#26
Heel & Toe
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C7 Active Fuel Management: 4-cylinder mode - tuning this out?
I have a 2015 C7 Z51 7 speed manual. Cylinder Deactivation in Eco Mode runs very rough. It feels as though the vehicle is misfiring when it kicks in and out of V4. It's very uncomfortable so I don't plan to use it at all. I’ve read some posts saying they can’t feel it at all. Maybe there’s something wrong with mine, I don’t know.
05-24-2015, 11:01 AM
#27
I have a 2015 A8. AFM kicked in all driving modes, including track. I did not like the AFM, because took some throttle to get into 8 cylinders again, making the car feel like operating with a lag. I had AFM disabled as part of the Trifecta tune I bought. The car is more responsive and fun to drive. Trifecta also increased the throttle response. Maybe a solution for me eventually would be to increase the throttle response and leave the AFM. I'm curious to see what would result.
05-24-2015, 11:17 AM
#28
To meet EPA mileage across the fleet GM includes AFM on the corvette. A high performance vehicle for sure. No true racing engine has the complicated lifter setup of cylinder deactivation. I would not buy a hot rod with that. Even if you turn it off the lifter setup is still there.
05-25-2015, 09:19 AM
#29
Le Mans Master
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St. Jude Donor '12-'13-'14
I get a lot of questions about this after guys change their exhaust to a louder system. Its more evident when the exhaust flows more cruising and you can hear it drop into AFM.
05-25-2015, 01:26 PM
#31
My question regarding the C7 AFM had less to do with exhaust sound and more to do with potential lifter, PVC, intake valve and plug fouling issues over time on those four cylinders that are shutdown by AFM based on previous issues with GM V8 engines using similar technologies. Apparently, automatics operate in AFM in all modes. I'm sure the tuners are already working this as an option for their customers. I believe GM issued a TSB for their 2007+ Tahoe/Suburban models. I don't know why they chose to add AFM to a Corvette; leave it in trucks and sedans.
05-25-2015, 10:54 PM
#32
5th Gear
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I used the Diablo Intune to tune out AFM which required doing the 93 octane Diablo tune.
I am about to go for my first free oil change at 6k miles. I will be restoring to the original setting before going in. I expect all to go as if there was no tune at all.
I will report my results here.
I have enjoyed the responsiveness having the AFM tuned out on my automatic C7. No V-4 for me.
I am about to go for my first free oil change at 6k miles. I will be restoring to the original setting before going in. I expect all to go as if there was no tune at all.
I will report my results here.
I have enjoyed the responsiveness having the AFM tuned out on my automatic C7. No V-4 for me.
05-25-2015, 10:59 PM
#33
Safety Car
I used the Diablo Intune to tune out AFM which required doing the 93 octane Diablo tune.
I am about to go for my first free oil change at 6k miles. I will be restoring to the original setting before going in. I expect all to go as if there was no tune at all.
I will report my results here.
I have enjoyed the responsiveness having the AFM tuned out on my automatic C7. No V-4 for me.
I am about to go for my first free oil change at 6k miles. I will be restoring to the original setting before going in. I expect all to go as if there was no tune at all.
I will report my results here.
I have enjoyed the responsiveness having the AFM tuned out on my automatic C7. No V-4 for me.
05-26-2015, 01:20 AM
#34
The problem with the cylinder deactivation is that it adds weight and complexity to the engine and exhaust.
There needs to be an ECM fix for taking it off and then a simpler exhaust could be installed.
Take the cylinder deactivation off the car and then the engine is 30 pounds lighter and the exhaust is 30 pounds lighter
.
There needs to be an ECM fix for taking it off and then a simpler exhaust could be installed.
Take the cylinder deactivation off the car and then the engine is 30 pounds lighter and the exhaust is 30 pounds lighter
.
11-12-2015, 05:45 PM
#35
Drifting
Well . . . I'm scheduled to go C7 shopping tomorrow, but you guys have scared the hell out of me with this AFM stuff!
Vince
Vince
Last edited by cenzo; 11-12-2015 at 05:46 PM.
11-12-2015, 06:44 PM
#36
Here is a link to a part that allows the AFM mechanism to be removed from the engine:
http://store.katechengines.com/gen-5...over-p440.aspx
.
http://store.katechengines.com/gen-5...over-p440.aspx
.
Last edited by B Stead; 11-12-2015 at 06:51 PM.
11-21-2015, 07:44 AM
#37
Racer
I did the latter and now I either use the paddle shifters around town in manual mode(locks out the AFM ) or plug in the AFM Disable from Range(199.00) and happily stay in v8 mode. The only downside on the AFM Disable from Range is it will drain the battery if you do not drive the car every couple of days.....
11-21-2015, 11:28 AM
#38
Racer
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06-04-2017, 03:33 PM
#39
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Agreed!!! I drove a '17 Camaro with AFM and it dissuaded me from even considering a Camaro. Now I read that the C-7 A8 has it, even in sport and track modes??? Sucks. Will really make me consider a C-7.......
06-04-2017, 03:54 PM
#40
Heel & Toe
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Afm
With the auto transmission AFM is active in D (Drive) at all times in all modes. If you select M (Manual) with paddle shifters, then it is not active.