What does progressive shifting mean to you?

If your truck has a pyrometer, and you go hill climbing, the lower the rpms get, the higher the EGTs (exhaust gas temps) get. Lug the motor too much on a long pull, and the EGTs will cook the motor.

Ive heard that the newer motors were made to be lugged. But I don't think I've ever had anyone explain how they overcame high EGT that will cook the top of the engine.

 

All engines have an optimum RPM range. Go outside of this range either way and you are shortening the life of the engine. When my father was teaching me to drive an old logging truck back in the early 70s he almost hit me because I kept lugging the engine. My father told me then and I believe today that a good truck driver will NOT lug an engine. You know by the sound too no need to look at the tach.

 

Slightly more aggressive than idle shifting

 

Makes sense when you think about how a newer engine runs regen cycles.
The exhaust will be scorching hot. The internals in the filters are sprayed down with DEF which might have a cooling effect as well as emissions.
Must have a higher heat tolerance if it's getting hot enough to turn soot into ash.

 

I can just see your boss shaking his head as you pull out of the yard empty wringing his new Pete out to 1900 or 2100 (whichever type of engine you have) rpms in every gear hahaha. Already going too fast for the next gear butt hitting it anyway instead of skipping one or two

A real pro wouldn't even hit real power making rpms until he is up in high range getting to cruising speed out on the road

Op I am not saying that you are doing this or making fun of you but it just cracks me up every time I see people doing the super trucker shifting. Wow Look at me I can hit every gear going through the parking lot

 

By the way OP if you have a paccar engine in that Pete the most torque in that engine is around 1250 rpm's so let that baby pull. Just watch your eg temps and that thing will grunt

 

I can't believe how so many people are in the dark when it comes to the very center of your job. I hate to see a driver shift against the peg on every shift. That just tells me the driver is very inexperience and that truck engine won't last very long. To the OP- the owner is right. Besides it's his equipment and he wants it driven a certain way. If you can not do that then save yourself and him the wear and tear you can put on some company truck

Cummins official stance on low rpm high torque engines came out many years ago. The first was ( if you can accelerate you're not lugging). Second was (progressive shifting is shifting through the gears during vehicle acceleration in such a way as to accelerate the engine in each gear only up to the engine rpm required to permit picking up the load easily on the next gear. In general it is not necessary to accelerate the engine to rated speed or to the governor, especially in low gears, in order to upshift).

On a 10 speed it's basically like this. The gear you start out in (that's the gear that will move the truck with no power applied) up to 1200, 1250, 1300, 1350, 1400, 1450, and up to full power or speed. Most of these drivers today do not know the big change that was made way back in the late 70's. All the engine makers were just about the same. You'd have a 2100 rpm engine or somewhere around there. You'd shift the same all the way up. But the government stepped in and made the requirement that the engines needed to save more fuel. So the engine makers came out with their new engines. Cummins was the low rpm high torque model, Detroit came out with the fuel squeezer and so on. It took a different type of driving so the companies made a large campaign to teach the current drivers what changes he or she needed to make. That's when progressive shifting came out. Let the engine work for you.

 

Progressive shifting is slang for you just got out of driving school.

 

Progressive is shifting in such a way, that you can get to the highest gear, at the lowest RPM'S possible. I'm in a freightliner, and I usually try to shift at a grand, except for the last 2 gears. There usually at @ 1300 rpm.

 

don't try it on Mt. Eagle on I-24. Done the ga overdrive a few times years ago. just don't kick it in neutral too soon.