Waiting for the ten speed...
09-29-2014, 07:23 AM
#21
Senior Member
Your are correct, it is government mandate for fuel economy. Has been for some time, making current round of improvements harder and harder. We are down to major changes for minor improvements. The weight reduction is a classic example and, in my mind, the 10 speed will be same (minor improvement).
09-30-2014, 09:48 PM
#22
A super tall overdrive will load engine, causing boost, and cost fuel. Too much load will cause tall overdrive to disengage and be useless. The extra gears will help pulling & accelerating but do not change highway economy. A 10 speed will be nice but can not do wonders. How much lower than 4x4 low range/1st gear do you need.? My 8,000+ super duty jumps off ground in lowest gear trying to do too much. A light F150 will go nuts.
So for best mileage, these new multi speeds with extra tall overdrives are the wrong way to go?
You don't understand the benefits of a smaller spread between gears? of a shorter, uncompromised launch gear? The effect that taller, uncompromised overdrive has on efficiency? Reduced pumping losses etc?
Using boost doesn't necessarily use more fuel than an engine downshifting and revving.
As for your 8000# Super Duty "jumping", well, I think we now have perspective.........
09-30-2014, 09:55 PM
#23
Ford used the ZF as a base for their 6r80 and did significantly change the design for their duty that Ford builds in their factories. In fact, there's two versions of the ford design based on torque requirements (I.E. the 3.7 n/a has less clutches as it didn't need the torque capabilities the more powerful engines had).
.....
.....
The ZF designed and engineered the basis for the 6R. Playing semantics doesn't make it a Ford design, any more than counting clutch plates. That change had more to do with shift / torque / inertia characteristics than capacities, btw. The ZF is a modular design that has different capacities is different variations, all under license from ZF...
,
Hunh? I was referring to the 6F trans in the latter part of my post. As I was referring to the last "Ford" designed / engineered 6 speed, not another one of ZF's licensed products.
Last edited by isthatahemi; 09-30-2014 at 09:57 PM.
