Ok smart car guys.

[withrespect]

One of my friends has a smart car.... but he totaled it... Hit a deer tick...

I just sent this joke to my boss and he asked me if I was drinking.

 

[glhs837]

But still a bit on the crank and pin. Be cool if it would alternate which 4 cylinders it chose. Less wear all around.

We asked the SRT engineers about this back when the introduced it to the SRT motors (cant chat with the 5.7 liter guys, when asked why they didnt chat with customers, the SRT guys told us "We asked them to participate, they said they design engines, they dont talk to customers") and they told us the motors have a +200,000 mile design life, and that in testing, the amount of wear difference between full and deactivated cylinders was enough to justify adding the shutdown hardware/programming complexity to all cylinders.

 

[GWguy]

Test of knowledge. I just found out my truck senses when to go from V8 to V4. I'm guessing it turns off spark and injectors. How to the O2 sensors know that all this fresh air suddenly in the mix is OK? Or do they even care?

It's all tied into the same computer, the same computer that commands the cylinder shutdown. Once it shuts down the cylinders, it changes the acceptable range that the sensors need to see. Everything is variable thru the computer programming, O2 level needs are not a single fixed number. They change based on the engine requirements.

Tow/haul mode (GMC) changes the settings as well as the tranny shift points, etc.....

 

[itsbob]

Test of knowledge. I just found out my truck senses when to go from V8 to V34. I'm guessing it turns off spark and injectors. How to the O2 sensors know that all this fresh air suddenly in the mix is OK? Or do they even care?

Software magic... with software all values are variable and adjustable.