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 2014 5.3L Specs

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ggbaird



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PostSubject: 2014 5.3L Specs   April 1st 2013, 12:44 pm

2014 Silverado/Sierra Release 5.3L MPG, Power, Payload and Towing Numbers

PUTC wrote:
Peak outputs for 5.3L engine are impressive; the Society of Automotive Engineers rates it at 355 horsepower at 5,600 rpm and 383 pounds-feet of torque at 4,100 rpms. However, from the GM-supplied power curve, it looks like 90 percent of the 5.3's torque output sits nicely in the towing/hauling sweet spot between 2,500 and 5,500 rpm. (It should be noted these ratings were conducted with 87-octane fuel, so it is possible those numbers could be a touch higher if run with higher-octane fuel.)

Additionally, EPA fuel economy numbers for both trucks with the middle 5.3-liter V-8 are 16/23/19 mpg city/highway/combined for a two-wheel-drive regular cab shortbed. The numbers are slightly less for the 4x4 model at 16/22/18 city/highway/combined. These numbers put the 2014 Silverado/Sierra with the 5.3L just a touch ahead of Ford's EcoBoost V-6 and well ahead of any other half-ton V-8 option.

As expected, the new GM half-ton trucks will have the highest maximum towing capacity among the competition, listed for both GM's as 11,500 pounds, but only with a new tow package that won't be available until later this year when the full lineup of truck configurations is available. Likewise, the new GM pickups will have improved payload capacities with a maximum payload rating (also requiring a special ordering package that won't be available until the end of the year) of 2,301 pounds for Silverado, 2,102 for Sierra. (Ford still owns the payload title for half-tons.)

Detroit News wrote:
GM said its new V-8 engine is expected to power three of four trucks it sells and is available to customers as an $895 option. GM's new pickups will come standard with a 4.3-liter EcoTec3 V-6 engine that hits dealerships this summer and buyers also can choose an all-new 6.2-liter EcoTec3 V-8 engine later.

The automaker will release fuel-efficiency ratings and other performance features on the 4.3-liter V-6 engine and an all-new 6.2-liter EcoTec3 V-8 in the future.
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joemac

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PostSubject: Re: 2014 5.3L Specs   April 17th 2013, 8:39 pm

Those are pretty decent numbers on paper. Will be interesting to see what real world numbers are like. Question remains how much of the 4 cylinder mode is needed to obtain the 16/19/23 rating?

Are the Gen5 motors are the first V8 engines to incorporate direct injection? I'm not aware of another existing application.

My wife's Edge with 2.0 EB is slightly disappointing for what I was expecting. Typically we get 21 or a touch better. It's rated for 21/24/30.

I see similar negative comments on the 3.5 EB in the F150.

It seems that speeds of 60 to 70 get decent mileage, but as speed is north of 70 fuel economy starts to fall off fast.
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ggbaird



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PostSubject: Re: 2014 5.3L Specs   April 18th 2013, 8:28 am

I've always thought that fuel efficiency figures should be linked to an 'optimum' speed range. There's no way anyone will get decent fuel economy while travelling north of 60 mph... IMO.
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joemac

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PostSubject: Re: 2014 5.3L Specs   April 18th 2013, 8:44 am

In the US of course we have a government agency in charge of rating fuel efficiency of cars, wound't you know it 90% of people can't seem to touch the ratings. The ratings still to this day are performed on a testing cycle that isn't repeatable to real driving it would seem. Now there are people that get 50 US MPG out of a vehicle rated for 25MPG, that goes without saying.
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turbobill



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PostSubject: Re: 2014 5.3L Specs   April 21st 2013, 9:59 am

ggbaird wrote:
I've always thought that fuel efficiency figures should be linked to an 'optimum' speed range. There's no way anyone will get decent fuel economy while travelling north of 60 mph... IMO.


Increased speed always leads to more fuel consumption. Aerodynamic resistance as well as all friction within the vehicle increases with the square of the speed. An increase in speed of 10 percent increases drag and friction losses 20 percent.

Slower is better.
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joemac

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PostSubject: Re: 2014 5.3L Specs   April 21st 2013, 10:57 am

I ran into a chart somewhere that indicated such. Wish I would have save it. It factored in several metrics that factored drag or frontal area. The take away was as described. Something like a 5 mph increase in speed has a factor of X multiplier in drag/friction.
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