AFM comment / question
Thread Starter
Le Mans Master
Joined: Oct 2012
Posts: 6,391
Likes: 1,453
From: South Dakota
AFM comment / question
There have been many posts about the V4 (AFM) mode, mostly negative. But as usual, they're the only ones that will generally post comments. My question is...how many have had absolutely NO problems associated with AFM on their C7? I haven't.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Not on my 2016 Stingray A8 I have 123,000 miles on. But I installed the Range AFM defeat module. But I started using it as a "just in case" at about 50,00 miles. Would forget to plug it in half the time, but never had any issues whatsoever with AFM.
Melting Slicks
Joined: Feb 2018
Posts: 2,154
Likes: 1,031
From: North Texas
Totally stupid idea.
AFM is:................(Garbage).
Hard on engines, drive train and TCC. Thats why GM to put in a steel torque tube. AFM was destroying the aluminum one.
Engine totally out of balance when in V4 mode.
I did not buy an expensive sports car to drive a 4 banger.
The list goes on...............
I can live without the 1 mpg.
It will never work as intended, never.
Tuned mine out.
AFM is:................(Garbage).
Hard on engines, drive train and TCC. Thats why GM to put in a steel torque tube. AFM was destroying the aluminum one.
Engine totally out of balance when in V4 mode.
I did not buy an expensive sports car to drive a 4 banger.
The list goes on...............
I can live without the 1 mpg.
It will never work as intended, never.
Tuned mine out.
Burning Brakes
Joined: Oct 2018
Posts: 985
Likes: 761
From: Monticello, AR
2024 C8 of the Year Finalist - Unmodified
No issues with mine, but I put the range in at about 5k miles and have 10k now. I also had the most recent fluid flush done 2 months ago as well.
Administrator
Joined: Mar 2001
Posts: 368,060
Likes: 24,730
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
No problems on my 14, but not long after I bought the car (used), I installed a Range AFM disabled on the car.
Team Owner
Joined: Aug 2007
Posts: 136,140
Likes: 2,432
From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
My '14 was an M7 and I did leave it in Eco Mode most of the time and never had any issues with AFM. Sold it with 52K miles on it
My '19 GS M7 had an AFM lifter fail at only 2,400 miles. Since the fix, I've never put it into Eco Mode again
. At 11,500 miles, no issues
If interested you can read the thread here:
https://www.corvetteforum.com/forums...e-failure.html
My '19 GS M7 had an AFM lifter fail at only 2,400 miles. Since the fix, I've never put it into Eco Mode again
. At 11,500 miles, no issuesIf interested you can read the thread here:
https://www.corvetteforum.com/forums...e-failure.html
Team Owner
Joined: Apr 2013
Posts: 26,224
Likes: 4,345
From: Chirper Island
None, with a caveat.
116,000 miles on my '14 A6, when a hanger broke on my exhaust, screwing up the wiring harness and breaking one of the AFM actuators. So not an actual problem with the AFM.
However, I drove exclusively in M with the exception of ~500 miles to test it out in 2014. Never went back to D.
116,000 miles on my '14 A6, when a hanger broke on my exhaust, screwing up the wiring harness and breaking one of the AFM actuators. So not an actual problem with the AFM.
However, I drove exclusively in M with the exception of ~500 miles to test it out in 2014. Never went back to D.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,801
From: Charlotte, NC (formerly Endicott, NY)
Only have 15K miles on my M7 15 Z and I use Eco Mode a fair amount of the time when driving on the streets/highway. I have had no AFM issues. AFM seems to be good for about 1 mpg at 70 mph or about the same as removing the center wicker from the spoiler. I see/mostly hear AFM actuate in 4th, 5th and 6th gears around town. As long as I am judicious in throttle movement the car will stay in 4 cylinder mode quite a bit in 4th gear.
Bill
Bill
Team Owner
Joined: Sep 2000
Posts: 25,002
Likes: 2,703
From: Far NW 'burbs of Chicago
St. Jude Donor '13
2017 Z51 A8
30,000 miles
With the original trans fluid, the rpm would vary +/- 50-75 in V4 mode but it didn't seem to cause any actual problem.
Went to the new fluid at about 25k miles and the variation is completely gone.
30,000 miles
With the original trans fluid, the rpm would vary +/- 50-75 in V4 mode but it didn't seem to cause any actual problem.
Went to the new fluid at about 25k miles and the variation is completely gone.
Racer
Joined: Sep 2019
Posts: 375
Likes: 208
From: Hershey,PA
My '14 was an M7 and I did leave it in Eco Mode most of the time and never had any issues with AFM. Sold it with 52K miles on it
My '19 GS M7 had an AFM lifter fail at only 2,400 miles. Since the fix, I've never put it into Eco Mode again. At 11,500 miles, no issues
If interested you can read the thread here:
https://www.corvetteforum.com/forums...e-failure.html
My '19 GS M7 had an AFM lifter fail at only 2,400 miles. Since the fix, I've never put it into Eco Mode again
. At 11,500 miles, no issuesIf interested you can read the thread here:
https://www.corvetteforum.com/forums...e-failure.html
Instructor
Joined: Feb 2019
Posts: 126
Likes: 52
From: OTP Atlanta
1st Gear
Joined: Feb 2019
Posts: 1
Likes: 0
I have a 2015 Z51 I just ordered the Range Technology AMF disabler. I will let everyone know what happens. I was reading all the posts about issues with transmission and I’m doing this as a preventative maintenance measure.
Le Mans Master
Joined: Feb 2010
Posts: 7,798
Likes: 314
From: Santa Fe Tx
Defining a Problem is also an opinion unless the AFM just broke?
For me the driving experience is important in a high performance car. If I'm driving a truck or SUV maybe not as important. Forgetting about linking some of the A8 problems with AFM and only the driving experience. The engine shifting from 8 to 4 and back is not seemless. It is noticable. I do not like that.
Someone mentioned 8 speed transmission. I'd prefer to have 6 or 5 or 4 ?? not sure which it just seems like the A8 is constantly shifting up down .....
Too much complexity- I'm not smart so simple works better for me.
Just my opinion
Have Fun Drive Safe