Silverado may get the i6 twin turbo charge

4banger · June 13, 2022

17 hours ago, 1454 said:

Derail how? They are designing now for 2028 and beyond. So by making comments about 2035 being pure EV indicates the brand doesn't want ice anymore.

"GM’s Mary Barra Has a Plan to Win the Electric Vehicle Race - The New York Times" https://www.nytimes.com/2022/05/12/business/general-motors-mary-barra-electric-cars.html

Personally, I believe it is stupid and cutting off one's nose to spite their face. But this is the new gm. But whatever. I'm not sure what you thought I was getting at, but by the companies public stance, and as I stated, I could be wrong, they don't seem to value ice anymore.

shoot sorry mate, I had to look up the ice meaning regarding vehicles...

well ice vehicles will be required in a lot of this continent for a long long time, when do we see electric vehicles being able to warm up at -35c, drive 500 kms (300 miles) with a spare gerry can style battery or two in the box/trunk to go another 500 km (300 miles) while idling and staying warm for stops at bathrooms and pick up some food/coffee? oh and these power cells need to deliver the same amount of energy as a 5 gallon gerry can with similar size and weight to keep practical, oh and when you get to your remote destination in the cold landscape you need to be able to top the vehicle and the two gerry can cells to full inside a half hour so you can carry on again....when electric vehicles get to that level then maybe they could make sense on this continent, these greedy lunatics have zero sense of reality, it's all for dollars between them and also control, they want your rides connected to the hive so at some point travel can be fully regulated and permissions granted etc.

4banger · June 13, 2022

3 hours ago, John813 said:

Turbos and less cylinders is the future for ICE, with some hybrid tech at some point this decade IMO before the full switch to EV. With maybe Chevy maybe going straight to EV skipping the hybrid tech

Ford beat everyone to the V6TT party and is one step ahead with the powerboost.

Although through my real world testing there is no real MPG savings between a 5.7L Hemi Wagoneer vs a 3.5L Expedition with close to the same gear ratio (3.21 8 speed Jeep vs 3.31 10 speed ford). 17.3MPG vs 17.6MPG

The only ecoboost full size I saw noticeable MPG improvement from was the 2.7LTT, which is a very good engine. Honestly would have zero complaints using it as a DD. Got over 23mpg driving a 2.7LTT 5 years ago as a 2 month loaner lol.

No doubt in my mind Chevy will release a 3.XLTT engine that will kill off the 5.3L and possibly the 6.2 shortly after in a few years.

Ford still has the 5.0, which has yet to get much R&D compared to the ecoboost in the trucks.

Seems like Ram has rung the death bells on the 5.7L in the 1500's with the Wagoneer going 3.0LTT in both lineups.

But the wagoneer MPG barely moved going from the 5.7./6.4 to the equivalent 3.0 engines, but they'll get boatloads of more torque.

good post, agree

only 40% of USA pop living around sea level, for the other 60% living above sea level the boost keeps on winning while NA engines efficiency plummets due to 3% power loss every 1000' so boost is the efficiency way forward and while mpg for similar outputs will be similar across the board, power will not and that's harder to show benefit to as a number on paper, the 3.5 turbo vs the hemi comparison...go up in elevation and load either vehicle and while they may suck same gas the turbo will be stronger and stronger as elevation climbs, you get there sooner and with less drama, how to measure that efficiency?, a turbo loses immeasurable power up to 10,000', maybe 1-2 hp & ft/lbs...the non-turbo's are wheezing badly up there and losses in the 90-110 hp & ft/lbs range at 10,000', the NA's lose 40-50 hp & ft/lbs at 4000' where turbos lose 1 of each

I wonder what kind of losses one would see in battery life on ev's at -35c and then factor in heating draws required when that cold...double whammy attacking battery power, a/c draws in summer will likely be less than heating draws in winter, at least in our ptac room dorms at work they are 1100w a/c and 2900w heating as an example. Like seriously...no freaking way ev vehicles are going to work during the winters for a ton of this continent!

TNTSierra · June 16, 2022

So here is a thought. GM already had the inline 6 Atlas motor over a decade ago in the Trailblazer. It was a 4.2L and produced 291 hp and 277 TQ. That could possibly be a motor to develop off of. I had 2 Atlas motors in a 2002 TB and then an 06 TB and they were both very strong and reliable.

Gangly · June 16, 2022

3 hours ago, TNTSilverado said:

So here is a thought. GM already had the inline 6 Atlas motor over a decade ago in the Trailblazer. It was a 4.2L and produced 291 hp and 277 TQ. That could possibly be a motor to develop off of. I had 2 Atlas motors in a 2002 TB and then an 06 TB and they were both very strong and reliable.

GM had a skunk works project with the Atlas 6 platform, specifically their 4.2L where they strapped on 2 turbos , dropped the compression down to 8.5:1, and made 400 HP and 400 TQ. That was before DI and cylinder deactivation so I would assume they could easily pull more power from that platform now. The problem with the Atlas motors was their length and engine mounting requirements. They simply didn't fit in anything but the singular Trailblazer platform. Absolutely great motor and like you, I would be interested in seeing its transition to a modern platform, but unfortunately I don't think its likely.

Edited June 16, 2022 by Gangly

TNTSierra · June 16, 2022

36 minutes ago, Gangly said:

GM had a skunk works project with the Atlas 6 platform, specifically their 4.2L where they strapped on 2 turbos , dropped the compression down to 8.5:1, and made 400 HP and 400 TQ. That was before DI and cylinder deactivation so I would assume they could easily pull more power from that platform now. The problem with the Atlas motors was their length and engine mounting requirements. They simply didn't fit in anything but the singular Trailblazer platform. Absolutely great motor and like you, I would be interested in seeing its transition to a modern platform, but unfortunately I don't think its likely.

Ya. I remember reading an article back in 2005 when GM was developing the SS Trailblazer and they did talk about “throwing turbos” on the inline 6, and it made good power, but they stated in the article they wanted that “robust V8” engine rumble and put in the out going 6.0L corvette motor. Which I’m glad they did because man I loved the vehicle. Sometimes you look back and say to yourself…..”why did I ever get rid of it”? If we only knew!!!

KARNUT · June 16, 2022

2 hours ago, TNTSilverado said:

Ya. I remember reading an article back in 2005 when GM was developing the SS Trailblazer and they did talk about “throwing turbos” on the inline 6, and it made good power, but they stated in the article they wanted that “robust V8” engine rumble and put in the out going 6.0L corvette motor. Which I’m glad they did because man I loved the vehicle. Sometimes you look back and say to yourself…..”why did I ever get rid of it”? If we only knew!!!

I’m with you I had a blast with mine. Our tractor sales went way up because I couldn’t wait to get on the road. On sales calls. 100K miles in two years.

TNTSierra · June 16, 2022

1 hour ago, KARNUT said:

I’m with you I had a blast with mine. Our tractor sales went way up because I couldn’t wait to get on the road. On sales calls. 100K miles in two years.

I sold mine with 99k in 2014 for a loaded GMC Acadia. Loved the ride of the Acadia and needed a more “family hauler” back then. Man I wish I would have just kept it and bought the Acadia out right but wife and I were not financially set like we are now. Sure to miss the SS though. Man glad u enjoyed yours. 100k in two years is a $h!t ton of miles and smiles!!!

June 16, 2022

On 6/13/2022 at 12:37 PM, 4banger said:

shoot sorry mate, I had to look up the ice meaning regarding vehicles...

well ice vehicles will be required in a lot of this continent for a long long time, when do we see electric vehicles being able to warm up at -35c, drive 500 kms (300 miles) with a spare gerry can style battery or two in the box/trunk to go another 500 km (300 miles) while idling and staying warm for stops at bathrooms and pick up some food/coffee? oh and these power cells need to deliver the same amount of energy as a 5 gallon gerry can with similar size and weight to keep practical, oh and when you get to your remote destination in the cold landscape you need to be able to top the vehicle and the two gerry can cells to full inside a half hour so you can carry on again....when electric vehicles get to that level then maybe they could make sense on this continent, these greedy lunatics have zero sense of reality, it's all for dollars between them and also control, they want your rides connected to the hive so at some point travel can be fully regulated and permissions granted etc.

Don't get me wrong, I don't believe the tech is remotely ready for mass market outside of select circumstances. Trucks they definitely aren't ready. But we still seem to be running headlong into poor policy. So, I guess we will see what shakes out in a few years.

4banger · June 17, 2022

On 6/16/2022 at 8:23 AM, Gangly said:

GM had a skunk works project with the Atlas 6 platform, specifically their 4.2L where they strapped on 2 turbos , dropped the compression down to 8.5:1, and made 400 HP and 400 TQ. That was before DI and cylinder deactivation so I would assume they could easily pull more power from that platform now. The problem with the Atlas motors was their length and engine mounting requirements. They simply didn't fit in anything but the singular Trailblazer platform. Absolutely great motor and like you, I would be interested in seeing its transition to a modern platform, but unfortunately I don't think its likely.

good to see the inline love, gm can be a little too soon for the public and likely that was the case, I have to think the packaging and design from the get go to be around a turbo in a truck platform that the L3B would be better to start with for a 6 cylinder version, maybe it will fit more vehicles? chances are an inline 5 won't fly after the 3.5 they did (I had one), but reality is they are getting like 77 hp and 120 ft/lbs per cylinder...that would put the L3B up to 3.4 liter displacement and 390 hp and 550 ft/lbs...maybe that's the answer, it would fit in everything that could handle that power likely