2014+ AFM (Active Fuel Management)

Dangelo · November 20

2 minutes ago, CamGTP said:

It's just one less than the top gear in a 8 speed, the only real simple answer to that.

6 speed is 5th and 8 speed is 7th.

Well good to know, I’ve been putting it on M5 this whole time putting it on M5 won’t mess up anything will it ? I don’t know much about engines I’m a novice, I can build you a house just not an engine lol

CamGTP · November 20

No. You just used more fuel running the rpms higher.

Dangelo · November 20

1 minute ago, CamGTP said:

No. You just used more fuel running the rpms higher.

Ahhh ok thank you sir I appreciate the info

Homewrecker007 · November 20

7 hours ago, Dangelo said:

Ahhh ok thank you sir I appreciate the info

You can just unplug the sensor on the brake booster hose to prevent it from going into v4 mode (this sensor is what tells the ECM it has enough vacuum to allow V4 mode) and you will be able to use all 8 gears.

KARNUT · November 20

I’m just spitballing and wondering at the same time. With my 2014 I just bought a handheld and turned off the cylinder deactivation. Making it last longer that way is certainly debatable. I had the higher gear so it turned a little more RPMs at 70. I still got 22 MPG at 72. The wondering part is with the new trucks. If you get the highway geared truck and run the next lowest gear, 9th. How much does that affect fuel mileage much. The 6 million dollar question is does that really effect longevity by locking out cylinder deactivation. Those opinions will vary. You can’t really prove either way because there’s so many variables. If they worked like my Honda. On most of the time and you can’t tell but the light. I’d be totally for it. If it fails prematurely then I wouldn’t. 156K miles and counting.