eddie09

Do all model years C7 LT1s (base & GS) from 2014 to present have cylinder deactivation?

TEXHAWK0

Yes

M7 is great since it only activates in ECO mode

Bill Dearborn

I leave my M7 Z06 in Eco Mode all the time when driving on the street. It works great. The only complaint I have is it doesn't stay in Eco Mode very much when driving in 7th gear. Any slight extra effort due to a small upgrade (maybe not even noticeable to you) and it switches to back to 8 cylinders. In 6th gear it stays in Eco mode and it takes a larger drag on the car to make it switch to 8 cylinders. From my limited testing with the Cruise set at 70 mph on a generally flat Interstate it looks like I can get about 1 to 2 mpg better gas mileage in in 6th than I can in 7th. The great thing about it is if you just think about accelerating it changes to 8 cylinders right then with no delay.

I have my Exhaust Settings permanently set to Track Mode which means the muffler valves are left open all the time. The only indication I have to which mode the engine is in
is the exhaust being loud in 8 cylinder mode or whisper quiet in 4 cylinder mode. Even between 1000 and 1500 rpm and the throttle barely cracked open to just maintain speed it produces a fairly loud burst of sound when it switches to 8 cylinder mode. I sometimes wonder what it sounds like to people riding next to me.

Bill

LanceVette

Always wondered, is there any indication when the engine is in 4 cyl mode? Like a display on the dash somewhere?

Kent1999

Yes. In certain dash display modes, you can see it switch between displaying "V4" or "V8" to show mode.

Corgidog1

Since my vette is not a dd, gas mileage is of no concern so I have zero interest in cylinder activation. I rarely leave 4th on the highway, maybe go into 5th on occasion but I hate the lose of acceleration in 5th. The toy aspect of driving this baby is the acceleration for me.

mbaessler

No engineering data on this just a personal feel for me. I have a manual 7 and I'm usually in Sport our Touring mode. In manuals, cylinder deactivation is only in ECO mode. Just don't like the idea of dead cylinders be driven by the other 4. Doesn't seem natural for the internals of V8. I just use it for fun drives and the V8 gets terrific mileage. Tried it once on the way home from New Hampshire just to make sure it worked. It did and I could feel the transition. Anyway just my feel for it. I guess I'm old school, plus I don't daily drive it. If I'm cruising on the freeway at 75-80 in 7th gear I'm tacking about 1300RPM. Great gas Mileage, I don't think ECO mode if going to make too much of a difference.

Billy346

I have the M7, and have never used Eco mode. I don't ever intend to either. I paid for a V8. I want all 8 cylinders working the whole time I'm driving that car.

I have a '16 Silverado with the 5.3 V8. I shift it into "M" mode so that the AFM doesn't kick in. The road manners substantially improve when it just stays in V8 mode.

Walt White Coupe

Lot's of dinosaurs on this forum. You paid for an engine that could run on 4 cylinders as well as 8. I'm not afraid to let it run the way it was designed.

Widgeon5

[QUOTE=Walt White Coupe;I'm not afraid to let it run the way it was designed.[/QUOTE]

The design of anything requires compromise between competing goals. With our engine, two of them are CAFE fuel standards and engine longevity. Though not an engineer, I believe the 4-cylinder mode will have a negative impact on the long-term health of the engine, and I will not use it.

ExRedRacer

Go to Information (left-arrow, first item on the top of the list) then scroll to the Fuel Range page. You'll see an icon that lights up green in the V4 mode and orange in the V8 mode. The Fuel Range page is just below the Trip A and Trip B pages.

If you prefer a full-time V8, you might be interested in a Range Device which plugs into the OBD port and bypasses the AFM system. Or, as others has stated, keep it in Manual and use the paddle shifters.

SRQStingray

Unfortunately, yes. That is why it is best to buy an M7 or get a Ranger.

SRQStingray

No dinosaurs, just wary of a stupid idea. Data suggests that AFM is contributing to A8 torque converter issues in Corvettes and Silverados.

Walt White Coupe

I believe the 4-cylinder mode will have a negative impact on the long-term health of the engine, and I will not use it.

From Mark Twain:

"It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so."

CB1953

...although I am driving a CTS-V, the engine and trans are the same. The difference with the Range unit installed to eliminate the V-8 to V-4 mode is nothing short of amazing. The engine comes to life and never misses a beat now. I feel no shudder, no hesitation like I was before. AFM IS a stupid idea....

mracer14

My 2017 Grand Sport will NEVER see 'eco' mode. Period

Jim Barker

I am always amazed when drivers of automatics say they do not notice it. It drove me crazy 20 to 50mph on curvy hilly roads. Now on my second C7 still hate it. HP Tuners allows several options to the Programming which was a better solution for me.

dvilin

Having the exhaust set to track mode DOES NOT keep the valves open all the time.

dvilin

Have never used it on my 2015 and certainly will not use it on my 2019 M7 Z06. For those that do that is fine but my driving style just does not align with a 4 cylinder mode.

Patman

Maybe I haven't driven my car enough yet (it has 845 miles on it) but I honestly don't notice it going in and out of V4 mode. To me my throttle response seems very good under all conditions. Perhaps they've fine tuned it better on the 2018s? I was originally planning to buy the Range AFM disabler but my current opinion is that I don't feel I need it at all.