Double Clutch vs. Floating

Really?

Has your trainer ever heard of "Progressive Shifting"?

 

When I hopped into the truck to take my test, I asked the tester how he wanted me to shift. He said shift and drive the route as if you had a full load on. So that meant to me floating and he never said anything about it. If your goal is to drive to impress someone ask them how they shift. If your driving down the road on your own, drive so you feel safe and in complete control of the truck.

 

when i took my road test for crete, the lady who was with me is the local runner for the knoxville area. i asked her how she wanted me to shift. her reply was since i was in the drivers seat, it was now my truck. i floated and she never said a word.

do not get in a hurry when shifting. that will cause more grear grinding than anything. you will have to be quicker per say on the lower side of the gearbox, as the ratios are closer than the top end.

once you get the hang of the shifting points, you will be able to shift and not think twice about doing so.

the below link is for a super 10, but i think it will help get the point across.

 

https://docs.google.com/viewer?pid=...859995ddb36d9cb31514&a=bi&pagenumber=18&w=800

 

This is what your link shows:

 

What's "progressive shifting"?.

 

Progressive shifting is a technique for changing gears commonly practiced by drivers of semi-trailer trucks. It is meant to reduce fuel consumption — something very important for drivers who travel several hundred miles each day.
Progressive shifting is accomplished by changing gears upward as early as possible when accelerating. After each shift is completed, the engine and transmission should be operating at or near the lowest rpm speeds recommended by the manufacturers of those parts.
When done properly, progressive shifting often results in quicker acceleration because diesel engines produce the most torque in lower rpm ranges.[citation needed] Additionally, this technique reduces wear on the transmission because synchronizers only need to compensate for relatively small differences in rotational speed between different components in the gearbox.


http://en.wikipedia.org/wiki/Progressive_shifting



American Trucker

 

Using Wikipedia for an end-all be-all Bible on trucking isn't the best approach. It's not completely inaccurate, but it doesn't explain the word "progressive" one iota.

That's pretty vanilla, don't you think?

Progressive shifting is using the least amount of RPM possible to make the up-shift, but you gradually need more RPM's as you increase vehicle speed. You can shift the low gears at 800-900 RPM and as you progress up through the gearbox, you use more RPM's in each gear.

If you are shifting from 9th to 10th at 900 RPM, you are now lugging the engine and making it very non-efficient.

This kind of sums it up in theory, but just like women, all trucks are different and you will learn what works as you drive the truck.

You should start off in a low enough gear each and every time so there is no clutch chatter, or drive-line lurching of the truck. Then you can do a couple hundred RPM's, shift, a couple hundred, shift again, and as you work your way up through the gears, give it a little more RPM each time.

That way, but the time you are shifting your last few gears at highway speeds, you are utilizing the correct power band of the engine and getting the max horsepower and torque combination you can.

It's called the "sweet spot". If you can find one on a truck, you can make a lady happy too.