[Glen e]

Who knows?....go to the DIC screen and find the fuel mpg screen that shows the v4/V8 indicator and then listen when it switches.

[Degausser]

I'm not a fan of the AFM on the 16 SS. Very noticeable pitch change with the NPP fuse pulled and back seat down. Accelerating to 50 mph and having AFM kick on around 40 is annoying. You can give it more gas but I'm not trying to race anybody.

I also find that it constantly switches between v4/v8 on cruise control above 60 mph.

Overall I do think that AFM is a nice feature to have, but I would prefer to have an option to disable it in the settings or have track mode turn it off.

[PinHead]

Originally Posted by Stex

I would pay extra to get a 6.2 without AFM and any of its components, meaning standard lifters and none of the extra oil routing solenoids etc. The AFM lifters with a lifter in a lifter and pins is just asking for failure. To me they are just something else to fail.

+1
We're paying the Gas Guzzler tax anyway right?

[BrianL]

Originally Posted by PinHead

+1
We're paying the Gas Guzzler tax anyway right?

I don't think we are. AFM and the CAG's system for manuals help to get around that tax.

[trboxman]

You are. It's on the sticker.

[JCunningham]

maybe its already posted but does AFM actually save gas. in the trucks it does not. who has turned it off and did your mileage change?

[Martinjlm]

Originally Posted by JCunningham

maybe its already posted but does AFM actually save gas. in the trucks it does not. who has turned it off and did your mileage change?

It all depends on how you drive. ANYBODY can drive in a manner to minimize AFM and will therefore see no improvement, and probably even a decrease in mpg compared to same vehicle without AFM. Similar to EcoBoost for Ford. Does it save gas? Depends on how you drive the car. Keep your foot in the turbo and you will not see a fuel savings. Drive it like an everyday vehicle and it will. AFM absolutely does provide significant fuel savings in trucks. If it didn't, it would have never passed the leadership reviews to add the mass and cost of the system to any trucks.

I have seen the test data that shows the impact of AFM on two similar vehicles with and without AFM driven under the same conditions. You need a controlled driving environment (ie - Proving Grounds) and serious instrumentation to make the conditions dead nuts even. In my time at GM I did see that.

One of many aspects of my job had me working with Product Engineering to determine which vehicles could / should get AFM, Stop-Start and other technologies, so I was included in review of test results.

When AFM was first put on vehicles, Corvette and eventually Camaro (AFM came in when there was no Camaro in the portfolio) were excluded because of 2nd order vibration issues when operating in V4 mode. That eventually got worked out as the vehicle architectures and the operation of AFM both improved over the years and AFM got added to both vehicles.

[JCunningham]

iv had 2 Silverados with AFM and test drove a 17. It did not work in any of them. I got better mileage after I turned it off and no it want the tune. The tune was stock just let me turn AFM off. All it does in the trucks where i live is come on when going down hill and back off with a shutter as soon as you were on level ground. the 5.3L does not have enough power to maintain a 30 or 55 speed limit in v4. Its possible that with our lighter more powerful cars that it might work a little bit on flat ground. NY is very hilly but they still could not maintain any speed in v4 on level ground.

[ChevyRules]

Originally Posted by Martinjlm

It all depends on how you drive. ANYBODY can drive in a manner to minimize AFM and will therefore see no improvement, and probably even a decrease in mpg compared to same vehicle without AFM. Similar to EcoBoost for Ford. Does it save gas? Depends on how you drive the car. Keep your foot in the turbo and you will not see a fuel savings. Drive it like an everyday vehicle and it will. AFM absolutely does provide significant fuel savings in trucks. If it didn't, it would have never passed the leadership reviews to add the mass and cost of the system to any trucks.

I have seen the test data that shows the impact of AFM on two similar vehicles with and without AFM driven under the same conditions. You need a controlled driving environment (ie - Proving Grounds) and serious instrumentation to make the conditions dead nuts even. In my time at GM I did see that.

One of many aspects of my job had me working with Product Engineering to determine which vehicles could / should get AFM, Stop-Start and other technologies, so I was included in review of test results.

When AFM was first put on vehicles, Corvette and eventually Camaro (AFM came in when there was no Camaro in the portfolio) were excluded because of 2nd order vibration issues when operating in V4 mode. That eventually got worked out as the vehicle architectures and the operation of AFM both improved over the years and AFM got added to both vehicles.

Do you know why with the 'Vette AFM would only activate in Eco mode, but Camaro remains active no matter the mode?

[Martinjlm]

Originally Posted by ChevyRules

Do you know why with the 'Vette AFM would only activate in Eco mode, but Camaro remains active no matter the mode?

Discretion of the Exec. Chief Engineer, with guidance from the people who advise on f/e/ targets their specific vehicle needs to achieve to help balance GM portfolio. Corvette is lower volume than Camaro and therefore less overall impact on CAFE.

There could be other factors, but that's what comes to mind.

[mekirk2]

Originally Posted by trboxman

You are. It's on the sticker.

I looked for it and didnt see it on my SS sticker....

[Roasted7]

Originally Posted by mekirk2

When you say removed completely, do you mean you had the lifters replaced or did you have it tuned out?

I believe if you install an aftermarket cam you will be required to get an AFM delete kit. Lethal's car is cammed so I'm pretty sure that the AFM is physically removed.

[Stig eh]

Originally Posted by Stex

I would pay extra to get a 6.2 without AFM and any of its components, meaning standard lifters and none of the extra oil routing solenoids etc. The AFM lifters with a lifter in a lifter and pins is just asking for failure. To me they are just something else to fail.

AGREED STIG EH

[Johnwon]

Originally Posted by Glen e

Not My experience ....the MB System is virtually instantaneous. I really don't want it either, but it's being way overblown as a problem. As your foot comes on the brake, before you can get to the gas, no better how quick you try, the engine is restored.

This wasn't my experience with a new F-150 that I was given when one of our cars was in the body shop. It took a turn or two to start and I found the impatient people were honking their horn at me while I was waiting for the truck to wake up and start rolling when the light turned green. I finally found the switch and turned it off. The issue is that it turned itself back on every time I shut the truck off. I was really happy to get back to my Silverado and would not consider purchasing that truck until they solved the lag issue or I'd have it tuned out.