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MDSilveradoGuy Enthusiast

MDSilveradoGuy

Posted
Posted
3 hours ago, Grumpy Bear said:

It's already at 375 kPa (54 psi). Indy car territory. I'm thinking it's tapping out as is. 

If you look at the boost curve it's on the limiter from the hit. 

Not sure where you saw that at. It runs up to 22psi of boost. It’s not really pushing any design limits - GM wasn’t stupid enough to stress it like Ford does with the EB. 

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ShamrockShooter
ShamrockShooter

Well. Gals and Gents this topic was started for people who want to like or appreciate a new innovation. It will be a lot more fun to keep the negatives for another forum topic.   Yes it's a new engi

InertiaFaze
InertiaFaze

My latest 2.7T fuel economy numbers.....   400 mile AVG 29.1 mpg life of vehicle (11111.1 miles) 22.7 mpg

i82much
i82much

now they just need to make a turbo 6.2!

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)
5 hours ago, MDSilveradoGuy said:

Not sure where you saw that at. It runs up to 22psi of boost. It’s not really pushing any design limits - GM wasn’t stupid enough to stress it like Ford does with the EB. 

Gorehamj's post which I see I read incorrectly. I read that line at about 200 kPa or 29 psi. My bad. Thanks for making me look twice. :thumbs: 

 

27engine_deepdive_slide16.jpg

Edited by Grumpy Bear
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MDSilveradoGuy Enthusiast

MDSilveradoGuy

Posted
Posted
5 hours ago, Grumpy Bear said:

Gorehamj's post which I see I read incorrectly. I read that line at about 200 kPa or 29 psi. My bad. Thanks for making me look twice. :thumbs: 

 

27engine_deepdive_slide16.jpg

Haha no worries - what an interesting chart.

 

I will say that from my butt dyno and audible perspective that it is spot on. The turbo spools (and starts whistling loudly) right off idle. My neighbors used to be able to tell when I was coming up the road from the exhaust on my Colorado - now they can hear me whistling up the hill.

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LT4Banger Enthusiast

LT4Banger

Posted
Posted

Anybody else hopelessly waiting for some performance mods to come out for these 2.7's?!

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  • 2 weeks later...
kc classic Enthusiast

kc classic

Posted
Posted

Have a question regarding the 2019 GMC sierra. In the center of the dash board, in front of the catchall is a square domed area (between the catchall and the windshield). It is about 1.5" square. What is it?

OnTheReel Senior Enthusiast

OnTheReel

Posted
Posted
3 hours ago, kc classic said:

Have a question regarding the 2019 GMC sierra. In the center of the dash board, in front of the catchall is a square domed area (between the catchall and the windshield). It is about 1.5" square. What is it?

Light sensor for the auto headlights.

LT4Banger Enthusiast

LT4Banger

Posted
Posted

Anyone else with the 2.7 having 8-speed transmission Issues? I still have a harsh shift 1-2 and 2-1 after getting the new transmission fluid. 

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MDSilveradoGuy Enthusiast

MDSilveradoGuy

Posted
Posted
19 hours ago, LT4Banger said:

Anyone else with the 2.7 having 8-speed transmission Issues? I still have a harsh shift 1-2 and 2-1 after getting the new transmission fluid. 

I have the occasional rough 1-2, the occasional 2-1, and it shudders like a wet dog pretty much all of the time under light acceleration. The 8 speed is Satan's own transmission and needs to be recalled, taken out back, and shot...

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AlaskaErik Enthusiast

AlaskaErik

Posted
Posted
On 4/5/2019 at 8:53 AM, the wanderer said:

I suspect that little 2.7 gets better MPG than EPA. TFL Truck tested it and got like 25MPG on their Highway loop. I'm seriously considering it, but the reports of turbo lag at highway speeds does not bode well.

 

I plan on pulling a trailer, nothing more than 5 to 6 thousand pounds so it would work there, but I don't know. My gut tells me to let them work out the hiccups in the motor first, and fix that lag issue before I'd consider owning one in a truck I hope to keep 10 years.

 

The 5.3 is not that powerful compared to competition, but it's bullet proof for the most part.

I know this is an older post, but I pull a trailer in the 5 to 6 thousand pound range and my 5.3 was straining when crossing mountain ranges.  And the trans temp was over 200° going uphill.  No way would I ever try to tow that much with the 2.7 unless it was short distances over flat terrain.  That's the whole reason I upgraded to the 6.2 and max trailering package.

heymrdjCW Enthusiast

heymrdjCW

Posted
Posted
I know this is an older post, but I pull a trailer in the 5 to 6 thousand pound range and my 5.3 was straining when crossing mountain ranges.  And the trans temp was over 200° going uphill.  No way would I ever try to tow that much with the 2.7 unless it was short distances over flat terrain.  That's the whole reason I upgraded to the 6.2 and max trailering package.


Turbos get a huge benefit over NA vehicles crossing mountain ranges. If you were crossing the Rockies, you were probably down over 30% of your horsepower.
AlaskaErik Enthusiast

AlaskaErik

Posted
Posted (edited)
2 hours ago, heymrdjCW said:

 


Turbos get a huge benefit over NA vehicles crossing mountain ranges. If you were crossing the Rockies, you were probably down over 30% of your horsepower.

 

HP Loss = (elevation x 0.03 x horsepower @ sea level)/1000.  7000 x .03 x 420/1000 = 88.2/420 = 21% loss.  I'm still pumping out more horses than a 2.7.  I imagine it's the same for torque.  And I have that 3.42 rear end.

Edited by AlaskaErik
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