GMC Cylinder shutoff

[Mr.INSANE]

Has anyone heard about this gmc is now using a fuel saving technique that shuts off 4 cylinder on there 8 cylinder engines

 

sounds to me like someone had a little extra help on the idea. And for those who didnt know cadillac did this awhile back calling it the 4-6-8

 

very interesting imo

[280zwitha383]

I don't think they pull down the mpg like they should (for the trouble) but I like the idea although I would hate for it to ever malfunction. Probably they just have too much vehicle weight and then they're lugging around the other 4 cylinders so it's kind of surprising that it would ever work really well.

 

I have wondered before if one could use megasquirt to do their own custom setup like that, seems it would be pretty straight forward. You could set the ignition and injectors to fire every other cylinder?.

[BillZ260]

I was looking at the Chevy site last night for this very reason. The avalanche has this option and the demo video showed the 2,3,5 & 8 cyl's firing for ballance. I assumed it would alternate from the previous to 1,4,6 & 7 but the demo didn't show that. I also noticed that in the standard package of the vehicle you get a flexxible coupling from the engine to the exhaust for quieter opperation... Makes me wonder about how 'seamless' the 4 to 8 change is. I also didn't see much on actuall fuel savings.

 

I'm interested in this, could be an option for a good size truck that gets decent milage but I want to find out a lot more so that in 2-3 years I'll know if I want one. (or whenever the price get's closer to 20k w/ a few miles on them)

[2003z]

The 300C, Magnum and Charger R/T all do this also.