Going into AFM is like a quiet fart, I hear it and feel it.
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2019 Mustang GT Premium 6MT Daily Driver
2023 Corvette Stingray 2LT
2017 Porsche 718 Cayman
2009 Jeep Wrangler Rubicon

 

It sure seems odd that everyone of the worrywarts are wringing their hands over failures in an oil controlled device like AFM, when oil control is what's used in their variable cam timing that occurs every single time the engine is running. Their fine with VCT, but not AFM, OK.

 

^^^
Wonder if some concerned know the engine has variable cam timing? It's also what helps with mpg at lower rpm (where EPA does all mpg measurements) and allows the LT2 to achieve high hp at high rpms.

 

I just want to disable it so all 8 cylinders will warm up equally. I see the light after driving only a few miles. I drop into manual mode, then at the next stop light I forget and rev the hell out of a cold engine in first gear. !@#%^.

 

^^^^
Then set up Z-Mode where I often drive with Power/DCT in Track. Shifting rpm dependent on your right foot. Won't shift past 5th while warming up, better than running engine at low rpm in crazy 1.33:1 8th gear. Only good for GM to get great EPA mpg.. Then if you want to shift to Manual Mode do it whenever.

 

Gee, I wonder why the engineers at GM didn't consider this...

 

Pretty sure after a few combustion cycles the piston and rings are pretty warm, plus they are far from insulated from the cylinders next to them. It just hasn't been in issue. I NEVER hot rod a cold engine, but once the oil is at 170, and the coolant is stable at 180, it's go time and absolutely zero issues. My LT2 is King Kong strong and uses zero oil between changes.

 

^^^
The C8 will not go into V4 at low engine temps:

Powertrain conditions that will inhibit V4 mode:
• Engine speed out of range
• Manifold absolute pressure (MAP) sensor fault
• Accelerator pedal position too high, electronic throttle control
• Piston protection active, knock detected
• Engine oil temperature out of range
• Engine oil pressure out of range
• Engine oil aeration present
• Engine metal over temperature protection active
• Accelerator pedal position rate of increase too high, electronic throttle control
• Cylinder deactivation solenoid driver circuit fault
• Engine coolant temperature sensor fault
• Catalytic converter over temperature protection active
• Brake booster vacuum pressure low
• Brake Booster Vacuum Pressure Sensor Fault
• Axle torque limiting active
• Brake torque management active
• Vehicle speed sensor fault
• Engine coolant temperature too high
• Engine not running
• Vehicle speed not zero
• Engine coolant temperature low
• Reduced Engine Power Active, electronic throttle control
• Transmission gear incorrect
• Transmission range incorrect
• Ignition voltage out of range
• Maximum V4 mode time exceeded

 

Jerry, something is odd about your list. It seems to say V4 will be inhibited if the vehicle speed is not 0. Seems like is should inhibit V4 if the speed is 0. Did it come from a C8 Service Manual? The list I see is in is a little different - and does not have that odd criterion about speed not 0. But yes, your point is absolutely correct - the car will avoid V4 mode under a variety of condition that prevent uneven heating etc, including both time and temperature.

 

^^^
Have a list for my C7 but this was easier to find with a google search for the C8. It was from a post. Just pasted as listed. Saw that 0 speed but it says what I'm 99% 100% sure is the case, if at idle the car will not go into V4.

Note: Changed to 100% after your post!

 

The version I have essentially says that. It is inhibited if the "vehicle speed is out of range". And the "range" is a lower bound on speed (15.5 mph) so it essentially excludes idle.

There is a list for enabling it, and a list of conditions that inhibit it.

 

Exactly. I would not care at all after the engine is up to temp, water 195, oil 180. I want gas going to all cylinders so the pistons all warm up.
It amazes me that AFM will turn on after only a minute or two of driving. Give it some warm up time.

Engineers are under constraints to deliver, meet fuel savings requirements, lower pollution, etc. I'm not saying they got it wrong, but maybe it could be a little better.

 

I’m still discovering what my car is about but so far I find the technology a bit maddening. I have already spent more time figuring out what “settings” I want to use on the C8 than my previous twenty cars combined (which primarily consisted of the garage remote and radio stations). On the C8 OMG
…. what screen, what tiles on the screen. What drive setting. What settings WITHIN the my mode and Z mode settings. Turning off OTA, setting transmission in Z mode to track to avoid V4 (why on gods earth would I buy a 495 HP V8 engine to run only 4 cylinders?).

And a bunch more I can’t remember.

Can’t wait for winter to be over so I can enjoy driving the thing but so far to me “the technology” has been a bit overkill.

oh and Sirus and Onstar pestering me endlessly, two more “technologies” I never needed in my first 30 years of driving and don’t need now 🤷‍♂️

 

It sounds like you hate the car…might as well sell it and get something you like.

 

All these clowns condescending those that do not like AFM drink lattes and have a Prius as their daily driver.

 

Could not have been happier hearing my last ever AFM chatterbox this week on the way to drop off my C8 for a PCM unlock. Didn't even have to ask, AFM delete is standard and recommended for all HPT modifications.

Quick side note for my piece of mind friends. I have saved thousands over the years never purchasing any auto or home extended warranties.

 

The tech is definitely overload for me. My daily is an AMG that does have some configuration options but it’s not multi layered like the C8. Took me a few days to realize I can lock the display by unsyncing it to the drive modes. It was a riot to watch me figure out how I want the display to look then I put it in sport and everything changes!!!

Also wrestling with the mirror/camera. On its current setting the zoom is too close and it’s very disorienting looking forward then looking at the mirror so that’s currently on manual view which is fine. The brightness is also set too high. Looking forward it’s a cloudy day. Look in the mirror and it’s seems much brighter. Zoom and brightness are adjustable but when I tried to change it I didn’t have any luck but I didn’t spend more than 30 seconds because I had to get somewhere.

When I actually drove the car that was amazing and what I’m looking forward to. I imagine a lot of this stuff is kind of set it and forget it. That’s my hope.

I wanted a mid engine super car that I could afford and have fun with without worrying about $30k repair bill if something in the drive train let’s go during a track day. The C8 is definitely that. Once I set everything and get to really drive the car (it’s winter here now) then we’ll see if it stays or goes.

I still follow the 997 and 991 911 Turbo market. Those cars seem to be the “super car” of choice among my kid’s friends who own a shop. And the two seat AMG GTs is also a favorite I’d love to own.

I’m hoping the C8 stays for years. The engineers that designed that car deserve all the credit in the world. But I can definitely do without a lot of the “tech and connectivity”. I have an iPhone. It works fine. I wonder how much all this tech adds to the price of the car? Seems a lot of money went into things that really have no benefit to actually driving the car.

Also, it’s illegal here to use your phone while driving. But the C8 touch screen works just like a phone? And if I plug my phone into the car…. And use the car screen to operate my phone…. Am I still in trouble??? Enquiring minds want to know 🙃

 

Regarding the phone question, when connected to the car, via WiFi and/or BT, it supports phone operations though the infotainment system. Incoming calls show up on the infotainment screen with the name of the caller (if it is in my contacts in the phone). I can answer, talk, and hear through the car systems. I never touch my iPhone during this process. I will support outgoing calls the same way, via my connected phone. I do not consider this using the cell phone for purpose of law enforcement. I really cant say I have researched whether or not its technical violation, but I have never hear of anyone getting ticketed for "hands free" calling, which is what this is.

With regard to the tech, I don't mind the menus and options so much - I can just sit in my garage and step through all the choices until I get it. Which I did. What I do not like, and and you would not know it without looking at a service manual, is that the car is replete with sensor on every conceivable process and function. Pressure sensors, temperature sensors, shaft speed sensors, etc. .If any little discrepancy is found, like a temperature difference where there should not be one, the car will set a DTC, and in some cases will either curb performance or shut down. It makes me wonder how my old 1966 Pontiac with TurboHydramatic transmission could possibly run so long without an issue. NOT. It makes we wonder if the car is over-sensorized to the point that it is going to cause its own failure simply because it "thinks" something is wrong. But thats the way it is.

 

That is exactly what this Tech's video who had checked ~50 DCTs with CELS says is the issue. There are hundreds of CEL possibilities as it is protected by many sensors.

In fact, if you look at what has failed in DCT's other than early leaks and some gasket replacements, it appears his comments are right. For example, he said there are a number of pressure sensors so low pressure is unlikely to cause a failure just a tripped CEL and perhaps limp home mode operation.

 

I think all the choices are good. What makes you think the way you want things to work is the way I (and everyone else) wants them to work. Once you get it set up, you don't really have to mess with it any more.

Oh, and why 4 cylinders? So I can get 32 mpg on the highway, and save some money, while still enjoying almost 500 HP when I want it.