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
Turtle n Peeps wrote:hemismith wrote:
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
True, when I woke up this morning I thought I better add to my post but you beat me to it. Obviously I can't spend my whole life at 2000 rpm, but I spend very little above 4000 too. Any rate, during that range, the diesel's torque is decreasing whereas the Hemi's is increasing, and then of course you've already shifted into 2nd in the diesel and lost 33%.
I don't know about your tractor but I have a 335i and it's great. But the 335d is faster off the line even though the 335i will beat it ultimately. Acceleration is simply a function of the net torque (including tire diameter and everything else) at any given moment in time and the weight it is trying to move, assuming traction of course. But I don't think it's worth belaboring this issue.
