Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
dave@hennessey
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons

Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

Reply
 
Thread Tools
Old 07-12-2007, 12:37 AM   #1
ksmithers88
 
Drives: Yamaha R6
Join Date: Jul 2007
Location: Jacksonville, FL
Posts: 16
"variable cylinder shutoff"??

I was reading Road and Track today at work, and was looking through some of the new concept cars, and came across the 08 honda accord concept. Under the features list, it said it will include a "variable cylinder shutoff" for fuel economy. Apparently, when you're just cruising it shuts off 2 cylinders, instead of firing all 6 all the time. Has anyone heard anything about this technology, and is it possible that it could be implemented in the 5thgen?
ksmithers88 is offline   Reply With Quote
Old 07-12-2007, 12:41 AM   #2
CamaroSpike23
Mr. Nitpicky
 
CamaroSpike23's Avatar
 
Drives: anything I can get my hands on
Join Date: Sep 2006
Location: anywhere and everywhere
Posts: 22,861
Send a message via Yahoo to CamaroSpike23
Quote:
Originally Posted by ksmithers88 View Post
I was reading Road and Track today at work, and was looking through some of the new concept cars, and came across the 08 honda accord concept. Under the features list, it said it will include a "variable cylinder shutoff" for fuel economy. Apparently, when you're just cruising it shuts off 2 cylinders, instead of firing all 6 all the time. Has anyone heard anything about this technology, and is it possible that it could be implemented in the 5thgen?


yeah, the Cadillac 16 does that. V-16 shuts off up to 12 cyl when cruising. then opens them all back up for 1001 hp!!!
__________________
Never race anything you can't afford to light on fire and push off a cliff
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.

Quote:
Originally Posted by Bulldogwinters View Post
Read that link that Spike posted, it'll tell you everything you need to know.
Quote:
Originally Posted by WheelmanSS View Post
Post count is truly an accurate measure of how cool someone is on the Internet.
Quote:
Originally Posted by Greg Norris View Post
I piss excellence
and fart awesomeness
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.
"You can think I'm wrong, but that's no reason to quit thinking.”
Quote:
Originally Posted by Overflow View Post
But not all people were born awesome like you, Spike.
CamaroSpike23 is offline   Reply With Quote
Old 07-12-2007, 01:02 AM   #3
ksmithers88
 
Drives: Yamaha R6
Join Date: Jul 2007
Location: Jacksonville, FL
Posts: 16
i hope the maro has it, i'm hoping for 20mpg city and about 28hwy, but the gto gets 17/25, so i guess we'll see
ksmithers88 is offline   Reply With Quote
Old 07-12-2007, 02:54 AM   #4
Mindz
E.B.A.H.
 
Mindz's Avatar
 
Drives: you wild...
Join Date: Mar 2007
Location: In the happy padded room wearing a jacket that makes me hug myself...
Posts: 18,216
It was the original plan to have 4 cyl shut down while cruising to hopefully get around 33 mpg. That was a while back though. who knows what has changed since the concept-to-production chain started.
__________________
Blue Rush, 2010 SS [Car of the Week 3/22/2010] Traded in on...ZLZBUBB, 2013 ZL1
Mindz is offline   Reply With Quote
Old 07-12-2007, 03:07 AM   #5
CamaroSpike23
Mr. Nitpicky
 
CamaroSpike23's Avatar
 
Drives: anything I can get my hands on
Join Date: Sep 2006
Location: anywhere and everywhere
Posts: 22,861
Send a message via Yahoo to CamaroSpike23
i thought the big wigs at GM were still saying 30mpg highway?
__________________
Never race anything you can't afford to light on fire and push off a cliff
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.

Quote:
Originally Posted by Bulldogwinters View Post
Read that link that Spike posted, it'll tell you everything you need to know.
Quote:
Originally Posted by WheelmanSS View Post
Post count is truly an accurate measure of how cool someone is on the Internet.
Quote:
Originally Posted by Greg Norris View Post
I piss excellence
and fart awesomeness
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.
"You can think I'm wrong, but that's no reason to quit thinking.”
Quote:
Originally Posted by Overflow View Post
But not all people were born awesome like you, Spike.
CamaroSpike23 is offline   Reply With Quote
Old 07-12-2007, 08:31 AM   #6
Moose
Moderator
 
Moose's Avatar
 
Drives: '99 Camaro SS #1392
Join Date: Jun 2006
Location: Newtown, Pa.
Posts: 4,015
"Cylinder deactivation" is currently used by GM as well as MOPAR. (not sure about Ford)

In asking those who own a vehilce with this feature, they have all said you cannot notice it at all. And I haven't heard of any issues.

I haven't heard anything as the whether the Camaro would have this feature, but I wouldn't rule it out.
Moose is offline   Reply With Quote
Old 07-12-2007, 09:45 AM   #7
MerF
Go Rays!
 
MerF's Avatar
 
Drives: 03 Trailblazer
Join Date: May 2007
Location: St Pete, Florida
Posts: 2,537
I'm almost certain I read somewhere prety recently a higher-up practically guranteeing this technology being in the Camaro.

They call it "active fuel management", I believe.
MerF is offline   Reply With Quote
Old 07-12-2007, 11:23 AM   #8
Silverado
GM Guy For Life
 
Drives: 2010 GMC Yukon XL
Join Date: Apr 2007
Location: Omaha, NE
Posts: 1,021
I think MerF is right, I too remember reading that the Camaro would have it.....I also think MerF is right that GM calls is Active Fuel Management (AFM). It used to be called Displacement on Demand.

Chrysler calls theirs MDS or Multiple Displacement System.

It's actually been around for a long time....It was experimented with it during WWII. GM started pushing the benefits of it in the 70's/80's. GM "pioneered" it in 1981 in the Cadillac lineup using Caddy's L62 "V8-6-4" engine. Mistu followed up with their version a year later (which is where Chrysler basically got theirs from). Benz did a version in the late 90's as well (which further developed Chrysler's version).

Chrysler, GM, and Honda all currently have a version of this available.
Silverado is offline   Reply With Quote
Old 07-12-2007, 11:30 AM   #9
shibbychevy15
I'm your Huckleberry!
 
shibbychevy15's Avatar
 
Drives: 2001 Silverado 1500 Ext Cab
Join Date: Jun 2007
Location: Oak Harbor, WA
Posts: 40
I'm pretty sure GM is using it in the Impala and the Malibu. I'm pretty sure, as everyone else has stated, that it will find its way to the Camaro. The MPG war is huge and its going to be a huge selling point for GM as they already have like 8 or 9 vehicles that get 30+ .

~Cheers!!
shibbychevy15 is offline   Reply With Quote
Old 07-12-2007, 12:58 PM   #10
marczsport
GM Forever!
 
marczsport's Avatar
 
Drives: 06' Envoy ; 05' Impala
Join Date: Jan 2007
Location: Athol, MA
Posts: 72
Send a message via AIM to marczsport
Talking

Displacement on Demand has a nice ring to it....along the lines of "There's no replacement for displacement".
marczsport is offline   Reply With Quote
Old 07-12-2007, 02:44 PM   #11
3whiterag
GM Powertrain Retired
 
3whiterag's Avatar
 
Drives: 67SS350, 87 IROC L98, 96SS ver
Join Date: Jan 2007
Location: Niagara, Canada
Posts: 352
Quote:
Originally Posted by shibbychevy15 View Post
I'm pretty sure GM is using it in the Impala and the Malibu. I'm pretty sure, as everyone else has stated, that it will find its way to the Camaro. The MPG war is huge and its going to be a huge selling point for GM as they already have like 8 or 9 vehicles that get 30+ .

~Cheers!!
Yes GM has it already in full production. We build the 5.3L engines in St. Catharines that have the cylinder deactivation system and we used to call it "Displacement on Demand" Also, right now GM has over 23 vehicles that meet or exceed the set limits to be deemed "Fuel Efficient", more than any other manufacturer, I might add.
3whiterag is offline   Reply With Quote
Old 07-12-2007, 06:15 PM   #12
TAG UR IT
www.Camaro5store.com
 
TAG UR IT's Avatar
 
Drives: 2014 ZL1 #705
Join Date: Jul 2006
Location: SA, Texas
Posts: 26,328
Wow...you guys said it all. I drove a rental Malibu w/ the AFM. I couldn't tell the difference either. I'd watch the gauge go from 8cyl to 4cyl on the hwy on and off...on and off...
TAG UR IT is offline   Reply With Quote
Old 07-12-2007, 06:51 PM   #13
marczsport
GM Forever!
 
marczsport's Avatar
 
Drives: 06' Envoy ; 05' Impala
Join Date: Jan 2007
Location: Athol, MA
Posts: 72
Send a message via AIM to marczsport
Wink !!!

Quote:
Originally Posted by TAG UR IT View Post
Wow...you guys said it all. I drove a rental Malibu w/ the AFM. I couldn't tell the difference either. I'd watch the gauge go from 8cyl to 4cyl on the hwy on and off...on and off...

Hey Tag, would you mind letting the rest of us know where you got your hands on a new 8cyl Malibu??
marczsport is offline   Reply With Quote
Old 07-12-2007, 09:38 PM   #14
TAG UR IT
www.Camaro5store.com
 
TAG UR IT's Avatar
 
Drives: 2014 ZL1 #705
Join Date: Jul 2006
Location: SA, Texas
Posts: 26,328
Quote:
Originally Posted by marczsport View Post
Hey Tag, would you mind letting the rest of us know where you got your hands on a new 8cyl Malibu??
:eek: Yeah...that was a goof up! Sorry bout that...it was a 6 cylinder to 3 cylinder!!! Thanks for pointing that out. And if you're still interested...I rented it at Alamo rental in Cali.

TAG UR IT is offline   Reply With Quote
Old 07-12-2007, 10:12 PM   #15
Mr. Wyndham
I used to be Dragoneye...
 
Mr. Wyndham's Avatar
 
Drives: 2014 Camaro 1LE
Join Date: Jan 2007
Location: Buffalo, NY
Posts: 25,787
Send a message via AIM to Mr. Wyndham
Quote:
Originally Posted by TAG UR IT View Post
:eek: Yeah...that was a goof up! Sorry bout that...it was a 6 cylinder to 3 cylinder!!! Thanks for pointing that out. And if you're still interested...I rented it at Alamo rental in Cali.

Oh, that's nice Tag, just great...you drove an V8 malibu, and now your lying about it, instead of sharing the experience! Great...you think you know a guy... - had to, sarcasm's my game!

But I like to consider myself very knoledgeable about this particular topic...I don't build them...like some of us ...but I read a lot

MOST OF THIS IS REPEATED, I just love to type, right?:p

It's called AFM, active fuel management. It DID used to be called Displacement on Demand (I like this name better). I seem to have noticed that it's a mostly concentrated feature in Chevrolet engines, other branches have it, I do know that (just not which ones). It shuts off 4 of your cyllinders, either from a V6, or a V8. Got this from chevy.com:
Quote:
Active Fuel Management™ deactivates four of the six or eight (depending on the engine) cylinders with seamless precision
It's been around for a while (in idea-form just before recently). I was told by someone much older than me, though not a very reliable source, that when it was introduced way back when, that mechanics rejected it - because it was a bite to repair. 8 to 6 to 4, come on, right? Todays setup is much simpler, both overall and because it's only in 2 stages. Most of the reason it's easy is because the ECM (engine control module), or the on-board computer, takes care of it's activation. I've heard from one of GM's sites...actually I think it may have been THE GM site, that said AFM offers significant fuel economy gains, but those who do a extensive highway driving can expect even higher gains. Virtually a 4 cyllinder at 55mph, following me?

This technology is really neat, it works like this, so I understand: when activated, half the engine's valves (those of the AFM cyllinders) are "separated" from the camshaft. There are pressurized "connectors", that allow the pushrods to move without effecting the valves. Stopping intake, and exaust valves from moving, thereby taking a load off the engine (allbeit a small one). The injectors are also shut off (hence the fuel savings). Since the computer controls it, it's activation in measured in 100ths of seconds, seamless - and virtually undectable (except for the instant power thing). The activation is triggered under "light-engine load" though what that is defined as.... I wonder, form those with experince behind the wheel of one of these, does it activate under idle conditions?

The Camaro has been reported by GM as expecting 30 mpg highway, and I've heard 33, too in other reports - so I'm sticking to GM's 30. Though, expect a little more with extensive highway driving.

Silverado's have it, and still make MASSIVE power numbers! so I Like it!
Attached Images
 
__________________
"Keep the faith." - - Read Before You Post.
SIGN UP for 2014 Camaro5 HPDE @ Gingerman Raceway!
Mr. Wyndham is offline   Reply With Quote
Old 07-13-2007, 07:25 AM   #16
3whiterag
GM Powertrain Retired
 
3whiterag's Avatar
 
Drives: 67SS350, 87 IROC L98, 96SS ver
Join Date: Jan 2007
Location: Niagara, Canada
Posts: 352
Quote:
Originally Posted by Dragoneye View Post
Oh, that's nice Tag, just great...you drove an V8 malibu, and now your lying about it, instead of sharing the experience! Great...you think you know a guy... - had to, sarcasm's my game!

But I like to consider myself very knoledgeable about this particular topic...I don't build them...like some of us ...but I read a lot

MOST OF THIS IS REPEATED, I just love to type, right?:p

It's called AFM, active fuel management. It DID used to be called Displacement on Demand (I like this name better). I seem to have noticed that it's a mostly concentrated feature in Chevrolet engines, other branches have it, I do know that (just not which ones). It shuts off 4 of your cyllinders, either from a V6, or a V8. Got this from chevy.com:
It's been around for a while (in idea-form just before recently). I was told by someone much older than me, though not a very reliable source, that when it was introduced way back when, that mechanics rejected it - because it was a bite to repair. 8 to 6 to 4, come on, right? Todays setup is much simpler, both overall and because it's only in 2 stages. Most of the reason it's easy is because the ECM (engine control module), or the on-board computer, takes care of it's activation. I've heard from one of GM's sites...actually I think it may have been THE GM site, that said AFM offers significant fuel economy gains, but those who do a extensive highway driving can expect even higher gains. Virtually a 4 cyllinder at 55mph, following me?

This technology is really neat, it works like this, so I understand: when activated, half the engine's valves (those of the AFM cyllinders) are "separated" from the camshaft. There are pressurized "connectors", that allow the pushrods to move without effecting the valves. Stopping intake, and exaust valves from moving, thereby taking a load off the engine (allbeit a small one). The injectors are also shut off (hence the fuel savings). Since the computer controls it, it's activation in measured in 100ths of seconds, seamless - and virtually undectable (except for the instant power thing). The activation is triggered under "light-engine load" though what that is defined as.... I wonder, form those with experince behind the wheel of one of these, does it activate under idle conditions?

The Camaro has been reported by GM as expecting 30 mpg highway, and I've heard 33, too in other reports - so I'm sticking to GM's 30. Though, expect a little more with extensive highway driving.

Silverado's have it, and still make MASSIVE power numbers! so I Like it!
Well Done!!!
3whiterag is offline   Reply With Quote
Old 07-13-2007, 09:42 PM   #17
TAG UR IT
www.Camaro5store.com
 
TAG UR IT's Avatar
 
Drives: 2014 ZL1 #705
Join Date: Jul 2006
Location: SA, Texas
Posts: 26,328
Quote:
Originally Posted by 3whiterag View Post
Well Done!!!
That's what I was saying! And from a powertrain man himself! Kudos to you, Dragon.

Yes, I drove a Malibu, no it wasn't a V8... Since we talk so much about the V8, it just came out that way. But, I didn't even realize the engine was shutting off 3 of the 6 valves while driving. It was a while after driving that I was messing around with the odo contols to see what all the Malibu had. We were on the 101 doing about 80 or so and it said something like "3 cyl _____" Don't remember what else it was...maybe "off?" But, I'd hit the gas....NO LAG AT ALL....and bam, we were moving again w/out any hesitation. Really, like GM said, it was seamless. You couldn't tell at all.

As for the idling, I couldn't tell you for sure, but I'm 99% positive it will not deactivate the cylinders while idling.

Again, I really liked that write up. It was informative!
TAG UR IT is offline   Reply With Quote
Old 07-13-2007, 09:44 PM   #18
TAG UR IT
www.Camaro5store.com
 
TAG UR IT's Avatar
 
Drives: 2014 ZL1 #705
Join Date: Jul 2006
Location: SA, Texas
Posts: 26,328
Oh, and it constantly went from 3 to 6 on the hwy. Press the gas and it's 6. Let off the gas and it's back to 3. Tap the gas just a tad harder than you should and it's off again. But, it does work...and it does save gas.
TAG UR IT is offline   Reply With Quote
Old 07-13-2007, 11:03 PM   #19
Mr. Wyndham
I used to be Dragoneye...
 
Mr. Wyndham's Avatar
 
Drives: 2014 Camaro 1LE
Join Date: Jan 2007
Location: Buffalo, NY
Posts: 25,787
Send a message via AIM to Mr. Wyndham
Quote:
Originally Posted by 3whiterag View Post
Well Done!!!
Quote:
Originally Posted by TAG UR IT View Post
That's what I was saying! And from a powertrain man himself! Kudos to you, Dragon.

Again, I really liked that write up. It was informative!
Right, and Thanks!!! To you, Tag - and to 3Whiterag (it was an honor coming from a powertrain guy). I do a lot of reading on this stuff, can you tell? I really get facinated with these kinds of things. Again, Thanks!

btw, did I cover it all whiterag?
__________________
"Keep the faith." - - Read Before You Post.
SIGN UP for 2014 Camaro5 HPDE @ Gingerman Raceway!
Mr. Wyndham is offline   Reply With Quote
Old 09-23-2007, 11:17 AM   #20
Power Junkie
GM give me my fix please!
 
Drives: 95 Toyota GT4
Join Date: Sep 2007
Location: England.. aka the EU's whipping boy!!! (but not for much longer, hopefully)
Posts: 173
Umm... now i like the idea of saving fuel, but what about the exhaust note, obviously with all the V8's cylinders pumping away we should get a nice sound but what will happen when 4 shut off??

Will it quieten down or will it keep it's muscle tone??
Power Junkie is offline   Reply With Quote
Old 09-23-2007, 07:08 PM   #21
CamaroSpike23
Mr. Nitpicky
 
CamaroSpike23's Avatar
 
Drives: anything I can get my hands on
Join Date: Sep 2006
Location: anywhere and everywhere
Posts: 22,861
Send a message via Yahoo to CamaroSpike23
Quote:
Originally Posted by Power Junkie View Post
Umm... now i like the idea of saving fuel, but what about the exhaust note, obviously with all the V8's cylinders pumping away we should get a nice sound but what will happen when 4 shut off??

Will it quieten down or will it keep it's muscle tone??
i would imagine it would quiet down a tad, but when you are cruisin long distances I would think it better to be quiet. I drove From SC to IL and back a couple times in my 94 with the cutout open and closed and my exhaust is loud as is and after a while it starts to wear on you.

but with the AFM, just drop the hammer and activate all 8!
__________________
Never race anything you can't afford to light on fire and push off a cliff
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.

Quote:
Originally Posted by Bulldogwinters View Post
Read that link that Spike posted, it'll tell you everything you need to know.
Quote:
Originally Posted by WheelmanSS View Post
Post count is truly an accurate measure of how cool someone is on the Internet.
Quote:
Originally Posted by Greg Norris View Post
I piss excellence
and fart awesomeness
Quote:
Originally Posted by BowtieGuy View Post
Nobody makes CamaroSpike happy. You just disgust him a little less than other people.
"You can think I'm wrong, but that's no reason to quit thinking.”
Quote:
Originally Posted by Overflow View Post
But not all people were born awesome like you, Spike.
CamaroSpike23 is offline   Reply With Quote
Old 09-23-2007, 08:29 PM   #22
Mr. Wyndham
I used to be Dragoneye...
 
Mr. Wyndham's Avatar
 
Drives: 2014 Camaro 1LE
Join Date: Jan 2007
Location: Buffalo, NY
Posts: 25,787
Send a message via AIM to Mr. Wyndham
Right...everything will be effected with only half your cyllinders running. And at the strict parameters that are set for deactivation, I don't think you'll find an exaust note welcome at those times, anyways. I.E. Highway cruising, rolling down a hill, cruising through a city street (no gas).

And if you do want the note...pop it into a higher gear, and hammer it. You'll get all eight back up (That'd be considered a high-load)

AFM is definitely a win/win
__________________
"Keep the faith." - - Read Before You Post.
SIGN UP for 2014 Camaro5 HPDE @ Gingerman Raceway!
Mr. Wyndham is offline   Reply With Quote
Old 09-26-2007, 08:07 AM   #23
Jak
 
Jak's Avatar
 
Drives: 03 Dodge Dakota
Join Date: Jul 2007
Location: New York
Posts: 627
Just think of the fun you could have. Everyone knows horses don't like loud noises, you go from very quiet (4 cylinders) coasting through town to a growl (8) and scare the little mustangs into a stamped, when ever your around.
Jak is offline   Reply With Quote
Old 09-27-2007, 10:14 PM   #24
Justcallme61
 
Drives: 2000 honda accord v6
Join Date: Sep 2007
Location: South Dakota
Posts: 214
the only thing im not sure about is...how reliable is "AFM" or "DoD"? i mean is it likely that it will eventually stop shutting down cylinders (which i guess isnt a bad thing, hearing that beast all the time ;-) ) or go out like a tranny?


on a side note, i want a camaro.
Justcallme61 is offline   Reply With Quote
Old 09-27-2007, 11:26 PM   #25
Mr. Wyndham
I used to be Dragoneye...
 
Mr. Wyndham's Avatar
 
Drives: 2014 Camaro 1LE
Join Date: Jan 2007
Location: Buffalo, NY
Posts: 25,787
Send a message via AIM to Mr. Wyndham
I shouldn't think so...
there aren't any "moving parts" so-to-speak...it's mostly fluid working it's hydrolic magic.
__________________
"Keep the faith." - - Read Before You Post.
SIGN UP for 2014 Camaro5 HPDE @ Gingerman Raceway!
Mr. Wyndham is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
LSX owners: AFR Cylinder Head Owners FTI-EDC General Automotive + Other Cars Discussion 0 11-10-2006 05:54 PM


All times are GMT -5. The time now is 07:40 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.