New GM DI Truck Engines

In reply to Trans_Maro:

Yes, this.

Just because you ask the computer to do something doesn't mean it will. A manual trans helps, but is often not available.

To bring this thread back...

GM has released a sparse amount of info about their new DI truck motors. Recent news releases indicate:

5.3L DI V8 - 355hp, 383tq. 23USMPG highway

so, an increase of 30hp, close to 50tq, and an extra mpg or two on the highway.

Not bad at all. I wonder where peak tq is at though, I was looking at 5.0L Ford's and their peak torque is WAAAAAAY up there at like 4500rpm, much similiar to the old 5.3L. Interesting times we live in, manufacturers seem to be drifting towards putting more and more useless engines in pickups :(

What ever happened to GM's 4200 series inline six?

Appleseed wrote: What ever happened to GM's 4200 series inline six?

people realized that it was an underpowered gas hog and fell out of love with it..

but not before people started swapping them into various Japanese sports cars that came with inline 6 engines from the factory..

Appleseed wrote: What ever happened to GM's 4200 series inline six?

It probably doesn't fit in the truck chassis. It's a very tall engine.

HiTempguy wrote: Not bad at all. I wonder where peak tq is at though, I was looking at 5.0L Ford's and their peak torque is WAAAAAAY up there at like 4500rpm, much similiar to the old 5.3L. Interesting times we live in, manufacturers seem to be drifting towards putting more and more useless engines in pickups :(

My bet is that's why Ford came out with the ecoboost AND the 5.0 at the same time. the V8 for people that wanted them, with numbers that made it look pretty good, AND the ecoboost for those who need ALL THE TORQUE, EVERYWHERE!

It's just funny, I never realized this, but the final triton 5.4 was a STOUT motor.320hp and 380 (390?)tq at pretty low rpm. Only thing is that its only rated for 18usmpg on the highway, even with the 6 speed auto. Of course, if you go to fuelly.com, the real world results put the 5.4/5.3/5.0/eco neck and neck mpg wise.

HiTempguy wrote: ...Of course, if you go to fuelly.com, the real world results put the 5.4/5.3/5.0/eco neck and neck mpg wise...

Which makes sense from an energy-in-vs-energy-out point of view. It takes X hp to push barn door trucks down the road so it's all aerodynamics and how efficient the engine is at part-throttle. At the end of the day it's just not that much different. That said, when the trucks are loaded is where more of a difference might be seen... or not.

kb58 wrote:

HiTempguy wrote: ...Of course, if you go to fuelly.com, the real world results put the 5.4/5.3/5.0/eco neck and neck mpg wise...

Which makes sense from an energy-in-vs-energy-out point of view. It takes X hp to push barn door trucks down the road so it's all aerodynamics and how efficient the engine is at part-throttle. At the end of the day it's just not that much different. That said, when the trucks are loaded is where more of a difference might be seen... or not.

Most definitely. In fact, when towing, I think that you'll typically find that there comes a point where less power/tq gets better mpg as long as the configuration you have can move the weight in your lowest gear. And the ecoboost requires lots of fuel under load, so most places have actually been suggesting to use the 5.0L if you strictly tow AND are mpg conscious.

I'm still praying for 300hp/300tq out of the 4.3L v6 and to have that 300tq below 4000rpm. One can dream...

DaveEstey wrote:

novaderrik wrote: i don't know anything about the new V6, but i'm sure it will be LS based and will make more than enough usable power to make those ecoboost owners wonder why their overly complex engines are thought to be so damn special..

They're so damn special because they make 420 lb. ft of torque at 2,500 rpm.

And make that torque flat across the board. What kind of milage are they claiming while towing, my future BIL's '12 is turning in consistant 23-4mpg highway and consistant 21mpg highway towing his wrangler to offroad parks.(granted his wrangler and trailer might weigh 3k lbs combined)

I want to see how much these crate for, if a t-56 can be bolted up, and what they weigh in relation to an LSx. Might make for a fun Miata, instead of the usual transplant.

As has been pointed out elsewhere, mileage - especially for trucks - is subject to some Marketting Sneakiness - no surprise. Apparently "gasoline" in many states is no longer 100% gas, as it's being cut with some percentage of ethynol. That's all fine, except that ethynol's energy content is quite a bit less than gasoline - long story short, mileage sucks when using it. What happens is that car makers calculate mileage while using 100% gasoline, but when we fill up with a mix of gas/ethynol, mileage will be somewhat (or allot less.) There are a lot of unhappy truck owners who claim they don't get anywhere near the claimed mileage, and it's very likely that.... and that they expect to drive their barn-door sized truck at 80 mph and still get quoted figures. It just isn't going to happen. There was some article floating around bragging how an Ecoboost truck got 30-32 mpg, but that was at 45 mph, practical for nothing, but it does drive the point home how important aerodynamics is...

I'd agree with the ethanol bit causing some problems, but I'd say it was less a marketing thing on the manufacturers, than performing the test to the EPA standards. Also, most gas is 10% ethanol if it is blended, and if ethanol is 70% of the energy of gasoline, then we are looking at 97% the overall energy density of a gallon of ethanol vs gas at the 10% blend. So a 25 MPG truck (2013 Ram v6, ferinstance) should see less than 1 MPG difference.

Anywho, if the 5.3 makes 350/380 and gets 23 hwy, that is truly amazing and well done. I've been Ram 1500 shopping because they seem to care about mpg, and they have air suspension and those cool bed rail toolboxes (beer coolers), but I'll keep looking.

http://www.gmc.com/content/dam/GMC/global/master/nscwebsite/en/home/Vehicles/Current_Vehicles/2014_MYR/2014_Sierra_1500/Model_Overview/02_PDF/2014-GMC-Sierra-1500-Brochure.pdf

Stats posted for the 5.3L and 4.3L motors.

The 4.3L is super impressive (if you view it as a truck motor, which some people seem to forget its a truck motor with good torques, not a car motor with high hps).

4.3 is 285hp @ 5300rpm, 305tqs @ 3900rpm. I'd like to see a dyno plot of torques from 2000-3000rpm (typical towing rpm).

ALSO, the E85 numbers are CRAZY.

297hp @ 5300, 330lb-ft @ 3900

There is a place in Red Deer that sells you ethanol fuel mixed to your own desired ratio, and it's super cheap. Depending on how it affected mileage, I would totally do that. These new trucks are realistically a better towing vehicle with the V6 than my 93 TBI 350 is... AND the 5.3L is rated for 22usmpg highway with 4x4, I bet the 4.3L will be rated for close to 24usmpg highway which is just plain awesome

I am excited to buy a new truck next year, will be tough between the new gmc 1/2 ton v6 and the dodge 1/2 diesel. The fact that the diesel will probably be "premium" priced has me leaning towards a stripper v6 crew cab 1/2 ton chebby

I am impressed with the new 4.3L. If I'm correct, it's the same power as the 4.8L V8.

I really like the new Chevy trucks coming out.

I wonder how well this would do with 4WD.