C7 engine to have VVT, but may not have AFM - Corvette Forum : DigitalCorvettes.com Corvette Forums

hig4s · 11-23-2012, 08:06 PM

Just saw this, if it is a repeat sorry.

Jordan Lee at 1:10 says Gen V will have VVT for the Corvette as well as AFM cylinder shut down. Just the way it was said I get the impression the Corvette engine will not have cylinder shut down.

http://www.youtube.com/watch?v=IYSdu...ature=youtu.be

Roadkillz · 11-25-2012, 11:55 AM

I agree, the way that he stated it AFM for some vehicle applications especially after saying VVT for the Corvette makes it sound as if AFM will not be in the C7. I was actually shocked to see that it may be included on the C7 Corvette due to its performance limitations. In other words the LS3 C6 would have been a faster/harder revver then the C7 with LT-1.

Also I do not see how they could have solved the issue between AFM and manual transmissions.

ZL1GT · 11-25-2012, 12:19 PM

Most sources were pretty certain that AFM will be on C7s with the 8-speed automatic. Not so certain is whether C7s with the 7-speed manual will have AFM.

Roadkillz · 11-25-2012, 07:34 PM

I wonder what the fuel economy of the C7 is going to be, currently the LS3 powered C6 is rated at 26MPG highway. Can the C7 pickup 4MPG on the highway is my question, and what will that mean for real world fuel economy.

hig4s · 11-26-2012, 04:48 PM

Quote:

Originally Posted by Roadkillz

I wonder what the fuel economy of the C7 is going to be, currently the LS3 powered C6 is rated at 26MPG highway. Can the C7 pickup 4MPG on the highway is my question, and what will that mean for real world fuel economy.

At the moment I cannot find the link, but there was a statement by GM that the base C7 will be at least 450hp and have better MPG, but did not specify how much better.

Torquenews reported the quote as ". . . at least 450hp and 27mpg.

mbwalker · 11-26-2012, 06:19 PM

Quote:

Originally Posted by hig4s

Torquenews reported the quote as ". . . at least 450hp and 27mpg.

Seems like a lot of extra parts to break just to get a couple of MPG... sort of like the $50 LED ultra-bulbs Home Depot is selling.

Roadkillz · 11-26-2012, 09:14 PM

Quote:

Originally Posted by mbwalker

Seems like a lot of extra parts to break just to get a couple of MPG... sort of like the $50 LED ultra-bulbs Home Depot is selling.

Except we don't have either the final horsepower/torque figures for the new engine and we also do not know what it will get MPG wise.

GM stated at least 450BHP and better then the current car (which gets 26MPG highway).

ZL1GT · 11-26-2012, 11:01 PM

Can't predict what the EPA city and highway cycle results will be. But many of our 6-speed C5s and C6s get real world mpg well into the 30's when we take it easy. With the C7's lighter weight, direct injection/higher compression, more torque way down low, a tall 7th gear, and better aero, I'm expecting our real world mpg will be 35ish, maybe better

(especially if the manual trans LT1 has DOD/AFM)...even though the EPA cycle results may be way lower.

spd98 · 11-27-2012, 05:45 AM

I'm still not certain it will bein manual cars. GM has never had an application in a manual the issue is the time it takes to swap modes. If they do manage it I'm gessing that the new AFM system will have to be able to swap modes even faster than the current one. The current system can basically do it within 1 cycle.

Longtimer · 11-27-2012, 09:21 AM

Quote:

Originally Posted by ZL1GT

With the C7's lighter ... better aero

It will be interesting to see the Aero numbers for the C7. I'm not sure they will be very different from those of the C6. IMO, the weight, engine tech and the tranny changes will deliver potential significant MPG improvements in the real world. EPA MPG .... who can say?

I wonder if CAGS will still go 1 to 3, or will go 1 to 4 with more gears.

hig4s · 11-27-2012, 06:05 PM

Quote:

Originally Posted by Longtimer

It will be interesting to see the Aero numbers for the C7. I'm not sure they will be very different from those of the C6. IMO, the weight, engine tech and the tranny changes will deliver potential significant MPG improvements in the real world. EPA MPG .... who can say?

I wonder if CAGS will still go 1 to 3, or will go 1 to 4 with more gears.

The CAGS now forces the shifter to the right on the 6 speed so you end up in 4th.

Longtimer · 11-27-2012, 06:19 PM

Quote:

Originally Posted by hig4s

The CAGS now forces the shifter to the right on the 6 speed so you end up in 4th.

Really!!? I bypassed mine the first morning it was in the garage, almost 7 years ago. Sorry for the mis-info.

Wonder if they'll move it to 6th?!