Cylinder Deactivation / Active Fuel Management
 

It looks like this technology may be destined for the Vette. I believe it's the same DoD / variable valve timing technology being used in numerous SUV's already. It looks like it may push highway mileage beyond 30 MPG for the Vette (I'm assuming the current Vette is several hundred pounds lighter than the concept Camaro).

Concept Camaro

GM displacement on demand technology

It looks like they could have done this for the C6 but chose to wait for some reason. It's just a matter of time before it show up on the Vette.

I had some time to mess around with the new Tahoe with this feature. At least in the Tahoe, I could only keep it in V4 on relatively flat roads, and around 65 MPH or less. Maybe it would be better after break in.

Maybe with better aerodynamics the Vette would do better. If the change to DoD is cheap, then OK, but with 28 MPG already, it doesn't have all that much to offer the Vette.

IF THAT MILEAGE ISNT GOOD ENOUGH BY A HYBRID:thumbs:

I believe I read somewhere that there was around $100 cost difference between a Gen IV engine with and without the DoD technology.

Hoonose, did your Tahoe not swap to V4 while decelerating and idling?

I wonder if the CAGS could be removed if DOD goes onto the vette? I can tell you that this kind of technology works. I have a '05 grand cherokee hemi 5.7L with the cylinder deactivation. It's seamless yet goes to full power instantly. I hope GM goes with this on the C6.

If they're going to do that, might as well make the Vette a V10 or V12. Why not, if you can turn off the cylinders?

Decelerating I believe so. Idling? I do know it always started out in V8, so I think not. I did this over a month ago, and 'old timer's disease' must be setting in.

It was undetectable (except the V4/8 display and MPG changes) with the Tahoe.

I have read that GM is to have large SUV hybrids soon.
I might go Suburban that way...

I believe DoD was added to the GM Envoy and Trailblazer in 2005.

Just pull a couple of spark plug wires off. :thumbs:

The existing mileage is just barely good enough. The Vette is really close to the 22.5 mpg threshhold for requiring a gas guzzler tax. If you improve the gas mileage you can improve the horsepower without having to pay the stiff tax.

I thought they were just killing the fuel to the cylinders but you actually have to seal the cylinders as well or you gain no fuel efficiency.

It will be in the new C7. Thats why Lutz said that the C7 will be here sooner than later.

Also with computer controled varriable valve timing, you should be able to program in a "virtual" high performance cam.

I never knew it was even close. I don't think that DoD helps much in town, but it couldn't hurt.
I wonder what the tax would be?

This is what it is currently. Obviously as they raise the threshhold this chart will change ... but it gives you a good idea.

GAS GUZZLER TAX
Unadjusted MPG (combined)* Tax
at least 22.5 No tax
at least 21.5, but less than 22.5 $1000
at least 20.5, but less than 21.5 $1300
at least 19.5, but less than 20.5 $1700
at least 18.5, but less than 19.5 $2100
at least 17.5, but less than 18.5 $2600
at least 16.5, but less than 17.5 $3000
at least 15.5, but less than 16.5 $3700
at least 14.5, but less than 15.5 $4500
at least 13.5, but less than 14.5 $5400
at least 12.5, but less than 13.5 $6400
less than 12.5 $7700

Excellent information!
You can see that with even small changes in requirements, that DoD could easily be worth it!
Thank you for the data!

Yes - the technology is working, finally!

The idea of killing cylinders and reducing HP in a Corvette or any sports car for that matter seems counter productive and just plain wrong.

C6 is well above the guzzler tax limit why mess with a good thing. You want hybrid gas mileage and have a Corvette probably time to rethink your car choices. A car that has crap for HP and drops cylinders so it can be called some sort of eco machine with a Corvette's body is a sad sad thing to think about... Very poserish... I'd prefer to pay the tax over making the Corvette a Eunich. Make a decision you want a thorough bred or do you want gas economy?

I hope if they do it they keep a real engine as an option. Then someone will need to make a badge for it. :) Except that might be a real reason to have a badge, to show your Corvette is not really one of the Corvettes with a sewing machine motor in it.

A nuetered (even if it is part time) Corvette is sad. Maybe GM should offer a 4 cylinder for Corvettes and paint them dull colors. So they are easy to point out and laugh at.