MPG tuning idea

[ga2001532]

Am not to sure how possible this is but could we while on highway drop down to 4 cylinders while cruising. That would have to help me with gas and with this five speed it could make it get great gas mileage. Would it be as easy just shutting off two injectors? How do those newer GM engines do it?

[pocket-rocket]

The newer engines also hang valves open by way of doing something funky with the lifters, if I remember how it was explained to me. If you didn't leave the valves open the remaining cylinders would have to work harder to overcome the strain of the compression stroke of two cylinders that aren't producing power which is going to negate any fuel efficiency gains you would have seen.

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[ga2001532]

Yea I was thinking it would need that, so pretty much to achieve this I would need vvt, or somehow make a actuator that would hold the valves open that need to stay open.

[pocket-rocket]

Getting your engine in tip top shape will help, but only if it isn't 100% right now. Then you can get onto other things like ported manifolds and heads, cams, computer tuning. If an engine has more power it's easier for it to get the car moving, you just have to remember to keep your foot out of it, or it uses more than normal, lol.

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[onefastV6]

I have heard that a lot of the GM vehicles that had "active fuel management" 2007-2009 range have oil consumption problems.
I would personally get hptuners and increase timing/lean out fueling (to a safe level) during cruise conditions.

[pocket-rocket]

I have heard that a lot of the GM vehicles that had "active fuel management" 2007-2009 range have oil consumption problems.
I would personally get hptuners and increase timing/lean out fueling (to a safe level) during cruise conditions.

Then if you do more mods later you already have the tuner and know how to use it.

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[ga2001532]

I have a tuner heads,manifolds and stuff. I do think it would be possible to do this but you would need some special heads.

[Z26-T]

The oil consumption doesn't really deal with the AFM system. We're replacing pistons for that. I've seen the VLOM (the system that keeps the valves closed) have issues. I doubt VVT will help you very much if you want to cut cylinders, because all you'd be doing would be varying the valve timing, not keeping valves shut.