GM got it right!

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They seem to be about to start testing cylinder cutting V-8s on us soon.

But Holden are starting to play with Diesels in passenger vehicles, which will go down well here...and hopefully over there.
 
Originally Posted By: Shannow
They seem to be about to start testing cylinder cutting V-8s on us soon.

But Holden are starting to play with Diesels in passenger vehicles, which will go down well here...and hopefully over there.


They already have the cylinder deactivation on v8 in the US and as far as I know it works to the point you can't tell if you are in 4 or 8 mode.
 
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Didn't realise...sounds like a good thing (now, versus the 30 year old systems). Those Chryslers sound funny with their big exhausts driving through town on 4 'though.
 
Originally Posted By: Shannow
They seem to be about to start testing cylinder cutting V-8s on us soon.

But Holden are starting to play with Diesels in passenger vehicles, which will go down well here...and hopefully over there.


It has been here on the 5.3L for quite a while now. Initially called Displacement On Demand( DOD )and has been renamed Active Fuel Management( AFM ). My 07 Silverado( new style )had the 5.3L and AFM and it worked flawlessly mechanically. Unfortunately, it does squat for MPG. My 05 Silverado with non AFM 5.3L got 2-3 MPG better on average and other than the color(
LOL.gif
)and body style change( just 250 lbs more )they were identical feature wise right down to tire size. AFM is also available on 6.0L's and does seem to help the MPG there some from what I have read.

All the GM full sized 1/2 ton trucks and SUV's have optional or standard V8's with AFM. It is also available on some 8 cyl GM vehicles and the Trailblazer. The Impala has it on an optional V6.

Chevy Impala = 3.9L V6 and 5.3L V8
Buick Lacrosse = 5.3L V8
Pontiac G8 = 6.0L V8
Pontiac Grand Prix = 5.3L V8
Chevy Trailblazer = 5.3L V8

Even offered on the SAAB 9-7X SUV = 5.3L GM V8
 
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I've never seen a 6.0 with afm/dod. Got a 6.0L Sierra Denali w/o it and the 6.0L and 6.2L engines we install everyday in our SUV's at the plant don't have it. Just the 5.3's.
 
That Chrysler exhaust just sounds funny. The cylinder deactivation doesn't work in city stop/go driving.
 
The G8 looks like a nice car -- but IMO, it's about a decade late to the market. Just as fuel is skyrocketing into the stratosphere, GM introduces a "full size" sedan that comes with a V-8 (albeit optional...). I don't hate GM or any domestic auto maker, but I'm continually amazed by the domestic makers' seeming ability to to repeatedly misjudge what the average customer wants and needs. I keep surfing around the net looking at various other cars and car makers's sites, but then I ask where can I get a car with 96 cubic feet of passenger volume that gets 45-50 mpg, and I keep coming back to the same conclusion -- I love my Prius. If there were a domestic alternative, I'd have bought it -- but there isn't. . .
 
I am in complete agreement in GM's inability to understand what the market wants or needs. GM has been building cars that they want to sell instead of what people want to buy for a long time and their profitability shows.

Where is the manual transmission option? Could it be possible that people that might be interested in the performance that a 6L engine could deliver might want to shift their own gears as well.

I have bought 2 new vehicles in the last 7 years and I did not even go and look at GM products either time, and I come from a family that has been fairly loyal to GM over the last 30+ years.
 
I have a 07 NBS Silverado with the 6.0 and it has both AFM and DOD. Both work very good. I tend to do a lot of short trips with the truck so mileage sucks in the city until engine warms up and mileage goes up, 12 to 13 cold and 14 to 15 warm. On the highway, if I keep it under 70, it will get 20mpg. What I don`t like about the truck is the torque management and abuse mode programmed into the ecm and tcm. Anything under 40 mph when you hit the gas, nothing happens for 3 seconds.
 
Originally Posted By: Duffman77
Where is the manual transmission option? Could it be possible that people that might be interested in the performance that a 6L engine could deliver might want to shift their own gears as well.

From what I've read, the G8 V8 will be available with a manual transmission as well, although not initially, which is a shame.
 
Originally Posted By: ekpolk
The G8 looks like a nice car -- but IMO, it's about a decade late to the market. Just as fuel is skyrocketing into the stratosphere, GM introduces a "full size" sedan that comes with a V-8 (albeit optional...). I don't hate GM or any domestic auto maker, but I'm continually amazed by the domestic makers' seeming ability to to repeatedly misjudge what the average customer wants and needs. I keep surfing around the net looking at various other cars and car makers's sites, but then I ask where can I get a car with 96 cubic feet of passenger volume that gets 45-50 mpg, and I keep coming back to the same conclusion -- I love my Prius. If there were a domestic alternative, I'd have bought it -- but there isn't. . .


Just as you prefer a car with good mileage there are people that prefer a car that they are exited to drive. These people are willing to pay the extra gas costs to have this, just as you are willing to give up the fun to save money. Of course this group isn't your average customer so you might say oh GM is making a misjudgment. However what you are missing is that GM know this isn't the average consumer. GM only plans to sell 30k of these a year and if you ask me I think that is a real possibility.
 
Originally Posted By: LAGA
I have a 07 NBS Silverado with the 6.0 and it has both AFM and DOD. Both work very good. I tend to do a lot of short trips with the truck so mileage sucks in the city until engine warms up and mileage goes up, 12 to 13 cold and 14 to 15 warm. On the highway, if I keep it under 70, it will get 20mpg. What I don`t like about the truck is the torque management and abuse mode programmed into the ecm and tcm. Anything under 40 mph when you hit the gas, nothing happens for 3 seconds.


AFM( active fuel management )and DOD( displacement on demand )are the same thing just different name for it. DOD was the old name and AFM is the new.
 
How about that fuel-efficent Toyota FJ Cruiser? What was Toyota thinking? Another SUV when gas prices are going up? It's ugly as sin, to boot.
 
Originally Posted By: Quattro Pete
Originally Posted By: Duffman77
Where is the manual transmission option? Could it be possible that people that might be interested in the performance that a 6L engine could deliver might want to shift their own gears as well.

From what I've read, the G8 V8 will be available with a manual transmission as well, although not initially, which is a shame.



Same with the new Challenger. No manual offered in first year production.
 
Originally Posted By: ekpolk
The G8 looks like a nice car -- but IMO, it's about a decade late to the market. Just as fuel is skyrocketing into the stratosphere, GM introduces a "full size" sedan that comes with a V-8 (albeit optional...). I don't hate GM or any domestic auto maker, but I'm continually amazed by the domestic makers' seeming ability to to repeatedly misjudge what the average customer wants and needs.


I think that you'll be surprised...I am constantly amazed at the number of high performance V-8s and 6s on our roads.

The Commodore used to be a solid family sedan, available in 4 cyl, 2 6s, and 2 V-8s. The sixes sold many times over the number of V-8s (and 4s).

These days, the number of SS sedans (G8), Wagons, utilities, and 4 door utes is utterly incredible...they cost $60-$70k here, and petrol (regular) is $1.45/l.

There are so many of them on the road that depreciation is hideous...and they are still moving.
 
I dont really have any say on this whole thing, but......

I have a very vocal coworker who had an Suburban pre DOD days and last year got a new suburban with the DOD. He hates the DOD. He "says" he got noticeably better MPGs with the older suburban.

Take that with a grain of salt. He is an engineer and pretty meticulous about everything. So I don't doubt that he is seeing worse MPGs, but I have no idea of his driving style or if anything else has changed in his driving world.
 
Originally Posted By: badtlc
I dont really have any say on this whole thing, but......

I have a very vocal coworker who had an Suburban pre DOD days and last year got a new suburban with the DOD. He hates the DOD. He "says" he got noticeably better MPGs with the older suburban.

Take that with a grain of salt. He is an engineer and pretty meticulous about everything. So I don't doubt that he is seeing worse MPGs, but I have no idea of his driving style or if anything else has changed in his driving world.


Same experience I had. My non AFM 05 5.3L Silverado got substantially better MPG than the AFM 07 Silverado EC w/ 5.3L. Very disappointed in the MPG out of the new truck until I sold it. "Most" people that have had the two versions of the 5.3L to compare to have found the AFM gets worse MPG. Not all but most. At least on the Chevy truck sites I belong to.
 
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