Is this a bad thing?!?

vintageracer

vintageracer

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I am hearing that the C8 has "cylinder deactivation" (4/8). GM has had some sad reliability issues with this technology in the past. I wonder if people should be concerned (?).
It seems that it is not being made very obvious by GM.
I hope I am wrong about this and there will be no justification for my fears of this system as I had high hopes for the success and value of the C8.
 
I haven't heard of any issues on the C7, but I would imagine there is the odd one. Practically, most people just run the cars in V8 mode all the time. It's unfortunate they put the cylinder deactivation in there, since it adds weight, complexity, and cost where it isn't required.
 
vintageracer said:
I am hearing that the C8 has "cylinder deactivation" (4/8). GM has had some sad reliability issues with this technology in the past. I wonder if people should be concerned (?).
It seems that it is not being made very obvious by GM.
I hope I am wrong about this and there will be no justification for my fears of this system as I had high hopes for the success and value of the C8.
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theres some moron on utube babbling on about this, creating hysteria. take it with a grain of salt
 
2015 C7 and no issues with the 8-4 cylinders. I had them deactivated so the engine stays in V8 all the time. The gas mileage didn't seem to be effected by the deactivation.
 
Not possible that gas mileage would be the same in V8 versus V4 mode. I loved it for the highway as it made my C7 so fuel efficient and trust me I am not a slow driver lol.
 
Not an issue as far as I have heard with any C7 anywhere, anyplace. Love the feature of V4 mode on the hwy providing me with an average of 8.2 l/100 on the Bowling Green trip of over 10,000kms.
 
My XT5 has V4 mode and it too is seamless, but it only works under 70kms/hr. The Corvette will work under 120kms/hr.
A great feature!
 
GM has been working on this technology since the late 80's with the Cadillac 4-6-8. As these engines get smarter the deactivation gets more and more efficient. With this having our new computer system in it and the introduction of Dynamic Fuel management, this is very low on the list of things I am concerned about.
 
violinfather said:
Not possible that gas mileage would be the same in V8 versus V4 mode. I loved it for the highway as it made my C7 so fuel efficient and trust me I am not a slow driver lol.
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I had some other mods done to the car. Lost about 100 lbs. due to light weight components and had a Solar TB installed. The gauge showed 6.2 L/100 km on the highway flat part, going about 110 km/hr.
 
I have cylinder deactivation on 3 of my current vehicles and had it on my past 2015 Sierra.
My New 2019 Sierra has cylinder deactivation that is absolutely awesome - it's not just 4 & 8.
You don't even know it's there. I do see less han 7litres/100km averages (meaning during the past 100kms of driving) on long journeys in my Corvette and
my new 2019 Sierra has me in the high 9's on the highway. All with 6.2l power plants.
The numbers have actually become a novelty thing to me though as driving these is what I am really enjoying.
 
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I am currently driving my 3rd and 4th vehicle with Cylinder deactivation and have never had a problem with one of them.. :)
 


I have never had this V4 mode before but a few "youtube experts" say it's hard on the torque convertor, I plan on being in Z mode and on the gas !
 
Gilles27 said:


I have never had this V4 mode before but a few "youtube experts" say it's hard on the torque convertor, I plan on being in Z mode and on the gas !
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How can switching from v4 to v8 mode be hard on the torque converter. If that is the case then hitting the throttle hard would be hard on the torque converter. IMHO this guy is out to lunch.
 

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