Bump & Run

Shifting takes practice and time. After 5 years of driving I still stall the truck occasionally.

 

The only time I've ever heard the term is from a driver with Schneider... it's supposed to be their term for downshifting before you turn a corner.

I guess it means that you are downshifting to operate at a slower speed so that you can add a little throttle though the corner.

Like making a right or left turn at an intersection on a green light. Downshift to 5th (on a 10 speed) and then you have acceleration control while you make the turn. Instead of coasting the turn in too high a gear and having to downshift after or during the turn.


I think....


.............. Jim

 

Bumping and running refers to revving the tachometer up to the necessary RPM to down shift (for any reason).

 

i learned this while with schinder, we went threw the state of ohio, there was a 2 lane , the whole state west to east, traffic lights every few miles, we bumbed and ran the whole state weeeeeeeee, it was fun "but not at first"

 

Thats what you do when backing into a parking space at 3 AM !!!!!!!!!!!

 

the idea with "bump and run" is that rather than shifting down through all the gears what you'' do is brake till you hit idle, clutch the truck out of gear, rev to 1300 and then catch the appropriate gear for your road speed. Basically they'd rather buy brakes more often and fuel less often (they did a study some years back that found that is was more cost effective).

Now in terms of doing it, the whole thing is premised on the idea that you know the gear that matches your road speed # about 1300 RPM. It just takes practice to get it and to get smooth at it. I don't know where the book is and I haven't driven a pumpkin for about 4 years but IIRC
2nd 4 mph
3rd 6 mph
4th 8 mph
5th 10 mph
6th 18 mph
7th 25 mph
8th 35 mph
9th 45 mph
10th 55

In terms of general shifting it just takes time. One trick I was taught was that if you count off "one" as you clutch it out and "two" as you clutch it in you'll be pretty close. Eventually you wear a little off the gears and a lot off of you and it all meshes (pun alert!).