Question Question for the C8 guys (from a C7 guy)

[Late Life Crisis]

Got a question for you new-series folks. My friend has a C8 Z06 coming soon after a long wait. In his research he found out about the issues with “Eco-Mode” engine/valve train issues with the C7 automatics, and the use of OBD port plug ins to avoid going into V4 mode. I’ve got a C7 manual which has never been put in Eco even once so I can’t help him.

My question: is the Eco-Mode cylinder deactivation thing still employed on the C8’s, and if so is the potential for engine-related problems still there? He really doesn’t know anyone else with a C8 so I thought I’d hit the CCF knowledge base to find out.

Info appreciated.

LateLifeCrisis

 

[MKC8]

My question: is the Eco-Mode cylinder deactivation thing still employed on the C8’s, and if so is the potential for engine-related problems still there? He really doesn’t know anyone else with a C8 so I thought I’d hit the CCF knowledge base to find out.

Info appreciated.

LateLifeCrisis

AFM is still used in the LT2 SR engine, and I believe in the LT6 in the Z06.
AFAIK there is no OBD plug in to disable it available at retail for either C8 engine.
On the LT2 engine (and probably the LT6) Track Mode and Manual Mode disable AFM. Possibly Z Mode with certain "Track Mode" settings.
I have seen zero threads on any C8 Corvette forums regarding any mechanical problems with AFM.
Some say they notice it when it changes, others don't.
I don't.

 

[DenisC8]

C8 Z06 does not have cylinder deactivation so you are looking for a solution to a problem that does not exist

 

[Gilles27]

I'm glad my Z06 doesn't have AFM valves but she's definitely a thirsty girl compared to my Stingray

 

[MKC8]

C8 Z06 does not have cylinder deactivation so you are looking for a solution to a problem that does not exist

Thanks for clarifying for me. I was guessing it was included.
It really is a ridiculous function on these types of cars/engines.

 

[Late Life Crisis]

Thanks for all the feedback. As noted, I’m a C7/M7 type so I don’t have background on the issues with cylinder deactivation, and my buddy is new to the C8 Z06 I’ll let him know that he’s got nothing to be concerned about with the engine problems due to the switch to a V4 on his new buggy.

L.L.C.

 

[1st Vette]

Thanks for clarifying for me. I was guessing it was included.
It really is a ridiculous function on these types of cars/engines.

Just leave it in sport mode….

 

[Paul C7 to C8]

You can purchase an AFM disabler that simply plugs into your obd port and it will deactivate the 8 to 4 cyl issue. Just Google the Range AFM DFM Disabler....

 

[Skahaman]

Range Technology doesn’t have one available for the C8 at this point. C7 yes.

 

[Skahaman]

Just leave it in sport mode….

Still cycles into V4 in sport mode.

 

[1st Vette]

Still cycles into V4 in sport mode.

Damn . What about manual mode.

 

[Paul C7 to C8]

Range Technology doesn’t have one available for the C8 at this point. C7 yes.

Yup your right... I thought they offered it for both C7 n C8

 

[MKC8]

Damn . What about manual mode.

Both Track Mode (page 201 PDF OM), and MM disable V4. Personally tried both.
Still haven't tried Z Mode with some Track mods.
Adding PTM to Z Mode disables Cruise Control.
Or Z Mode disables it by default, not sure about that.
Maybe it also disables AFM.
I'll get around to it eventually. AFM doesn't bother me.
UPDATE: PTM added to Z Mode disables cruise control.
Z Mode with ESC (no PTM) allows cruise control.
Both Z Mode combos appear to disable AFM.
I saw no V4/V8 icon visible in the DIC during Z Mode. Doesn't mean it's not doing it in the background.

 

[1st Vette]

Both Track Mode (page 201 PDF OM), and MM disable V4. Personally tried both.
Still haven't tried Z Mode with some Track mods.
Adding PTM to Z Mode disables Cruise Control.
Or Z Mode disables it by default, not sure about that.
Maybe it also disables AFM.
I'll get around to it eventually. AFM doesn't bother me.

Interesting. Just got mine yesterday, still sorting out settings. I guess the v4 is to meet EPA requirements. Darn tree huggers , lol . I suppose just rolling down the highway you wouldn’t notice anyway and with the cost of high test not a bad thing. Tap the gas and you get all eight right away. Don’t know why people are complaining.

 

[MKC8]

Interesting. Just got mine yesterday, still sorting out settings. I guess the v4 is to meet EPA requirements. Darn tree huggers , lol . I suppose just rolling down the highway you wouldn’t notice anyway and with the cost of high test not a bad thing. Tap the gas and you get all eight right away. Don’t know why people are complaining.

AFM doesn't bother me either way.
I test this stuff out of boredom, mostly, and I do drive it a lot, so it's easy to do.
If I remember...

 

[Murray20c8]

Interesting. Just got mine yesterday, still sorting out settings. I guess the v4 is to meet EPA requirements. Darn tree huggers , lol . I suppose just rolling down the highway you wouldn’t notice anyway and with the cost of high test not a bad thing. Tap the gas and you get all eight right away. Don’t know why people are complaining.

Some say there is a noticeable noise when it switches. I notice nothing.

 

[DDHRocks]

I like the fact that I get better gas mileage with my C8 than my SUV on the highway, even with spirited passing. I actually like the cylinder deactivation.

Of course, I wanted a PHEV Corvette, so I'm already on the edge of getting kicked out of the Forums...

 

[MKC8]

UPDATE: PTM added to Z Mode disables cruise control.
Z Mode with ESC (no PTM) allows cruise control.
Both (of my) Z Mode combos appear to disable AFM.
I saw no V4/V8 icon visible in the DIC during Z Mode.
Doesn't mean it's not doing it in the background.

 

[Murray20c8]

UPDATE: PTM added to Z Mode disables cruise control.
Z Mode with ESC (no PTM) allows cruise control.
Both (of my) Z Mode combos appear to disable AFM.
I saw no V4/V8 icon visible in the DIC during Z Mode.
Doesn't mean it's not doing it in the background.

I'd think you'd see the icons if it did shift to v4.

 

[Thom]

My '23 in MM still has goes into V4.