2014 GM 6.2 Ratings

Kip81 wrote:
TQ moves your trailer not HP, gassers still have along ways to go to even try to keep up with a diesel pulling. I hate these HP numbers that they all put out. It means nothing if your not getting to the ground.

I agree with the first part, but I have spent a lot of time on the dyno watching a lot of different vehicle go through. On average most manual vehicles lose about 14 to 17 percent through the drivetrain and most automatics lose about 18 to 22 percent throught the drivetrain based on avertised horse power. A lot depends on your converter/clutch/flywheel/flexplate and rearend but it is good average that has been proven.

So if you figure a 22 percent loss for the 6.2 GM truck should lay down right around 327 HP and 358 Ft/lbs of torque. Not to shabby.
Take a Ford 6.7 diesel with a 22 percent loss. You are putting down 312 HP and 624 ft lbs of torque. I don't think that is any big suprise. The torque is where the diesel shines and gets the job done.
Of course the numbers are also going to be put down at different RPM, which to me, is not a big deal if I have to let the small block sing, but for some people, and I understand why, it is unnerving.

Infact when pickuptrucks.com tested a 6.7 this is what they got.

With the transmission in 4th gear (1.15 transmission gear ratio), maximum torque was measured at an average of 643.9 pounds-feet at 2,000 rpm, and horsepower peaked at 306.8 hp at 2,800 rpm. Both measurements were made at the rear wheels instead of at the crank, which is about 20 percent below Ford’s official figures.

about 20 percent right on target for an automatic transmission.

Most new automatic transmission are fairly effiecent and to see more than a 20 percent loss through the drivetrian in one is rare and unless you swapped out the converter for a higher stall.


I guess what I am trying to say is, if you make more power/torque at the crank, you are going to put more down at the wheels.