Rear axle ratios
I've had a hard time finding a truck with everything I want on it, so I'm debating the need for higher rear axle ratios. Here are the net 1st gear ratios for various half-ton trucks: Make Rear ...
Forum Discussion
hemismith wrote:Turtle n Peeps wrote:Exactly. So as a rule I'd expect turbo-charged engines not to need to much gearing because of their low-end torque. For some reason though the 5.7 Hemi felt faster off the line than the Ecodiesel even with the same transmission/rear end ratio and with less torque down low.
Because the Hemi has WAY more HP.
Well, that's why it is faster to 60, but that doesn't account for off-the-line feel. HP is just a mathematical function of torque and rpms; it only has more HP because it revs higher. At 2000 rpm, the diesel is putting out 160 hp. With the hemi's torque peak higher and losing some due to my elevation, I estimate that it has at most 120 hp at 2000 rpm. This makes me question the diesels specs.
Taken to extreme. My BMW feels way faster off of the line then my tractor even though the tractor is putting out 15x+ the torque to the tires.
BTW, Marty is on the money about the tire diameter. I was going to bring that up but he pulled a hole shot on me. :B
