Using The Throttle While Letting Out On The Clutch

Topic 26084 | Page 1

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Jeremy's Comment
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So my wifes at cdl school same one i went to and i was taught and practiced to release the clutch on initial take off with no accelerator and let the governor do the work and they are teaching her to use the peddle and lots of them including her have had stalling issues in my experience that is because you didnt let the truck do the work any input on that i feel like they are doing her and the class an injustice idk maybe im wrong but its the way i learned and ive nailed it my whole driving career

CDL:

Commercial Driver's License (CDL)

A CDL is required to drive any of the following vehicles:

  • Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
  • Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
  • Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
  • Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
PJ's Comment
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I was taught the same as you were and use it daily for the last 6 years and never had an issue. If it’s not the correct way, it sure works well.

Grumpy Old Man's Comment
member avatar

So my wifes at cdl school same one i went to and i was taught and practiced to release the clutch on initial take off with no accelerator and let the governor do the work and they are teaching her to use the peddle and lots of them including her have had stalling issues in my experience that is because you didnt let the truck do the work any input on that i feel like they are doing her and the class an injustice idk maybe im wrong but its the way i learned and ive nailed it my whole driving career

I used the accelerator while letting the clutch out with my trainer. Once. The verbal lashing I received taught me the folly of that.

CDL:

Commercial Driver's License (CDL)

A CDL is required to drive any of the following vehicles:

  • Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
  • Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
  • Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
  • Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
Joseph I.'s Comment
member avatar

I have only driven an Auto while driving OTR but when I first started driving 30 years ago it was pulling grain trailers out of the field so the thought of not using the accelerator before releasing the clutch never occurred to me. It would work empty or on flat pavement but that is about it,

OTR:

Over The Road

OTR driving normally means you'll be hauling freight to various customers throughout your company's hauling region. It often entails being gone from home for two to three weeks at a time.

Banks's Comment
member avatar

I learned how to shift on a whiteboard because I didn't understand it in practice. The way it was explained to me, speed and RPM have to match the gear. This varies truck to truck. In the truck I used it was the usual system

1+5=6 15 MPH is 6th gear 2+5=7 25 MPH is 7th gear

Add to that using RPM. You want 1000 RPM for each gear after idling. So if the truck idles at 500 RPM 6th gear would be 1,000 RPM, 7th would be 1,100, 8th would be 1,200 etc.

When down shifting you need to drop the speed to the lower end of the window. So if I'm going from 8th to 7th I want the speed at 20 instead of 25. Because I'm slowing down the RPMs drop so I have to give it a bump. I bump the accelerator while in neutral so the RPM jumps to 1,100.

Down shifting is clutch, bump, clutch Up shifting is clutch clutch

This may sound confusing, but in practice it worked well for me and my shifting has improved drastically in a short amount of time. I've never driven a manual and 2 weeks ago, I couldn't go from 2 to 3 without stalling out.

OWI:

Operating While Intoxicated

Rick S.'s Comment
member avatar

It's an old habit that comes from driving a car with a stick. You can "ease out" the clutch on a car without giving it gas - but it doesn't quite work correctly that way.

Going into a truck - I "thought" it was going to be easy, being I had driven a stick my whole life. One lap around the track - and I was asking myself "WTF was I thinking?"

Class 8 Trucks have enough "ooomph" in torque and HP, to get the rig moving without fuel. "Feathering" the clutch usually results in a jerky launch, rapid wear on the clutch, and having to get out of your launch gear almost as soon as you get the clutch full released.

Took me a minute to get used to - I started floating gears almost immediately - and FAILED my first road test: because I had forgotten how to double-clutch.

Rick

Floating Gears:

An expression used to describe someone who is shifting gears without using the clutch at all. Drivers are taught to "Double Clutch" or press and release the clutch twice for each gear shift. If you're floating gears it means you're simply shifting without using the clutch at all.

Jeremy's Comment
member avatar

Thanks i thought i was crazy this school sucks that she is attending i hope she gets her license so i can actually teach her how to drive a truck properly

Brett Aquila's Comment
member avatar

You will never need to give it any throttle while letting out the clutch in a big rig, assuming you're in a low enough gear. Even fully grossed out at 80,000 pounds starting on a hill the truck will take off just fine in 1st gear without touching the throttle. In fact, you're not supposed to give it any throttle while you're letting out on the clutch. You will burn up the clutch rather quickly that way, or snap a driveshaft if it locks up too quickly.

Jeremy's Comment
member avatar

Yea that was my sentiments exactly this is why im baffled as to the school training her to use the throttle so im training her on the weekends the right way

Baffle:

A partition or separator within a liquid tank, used to inhibit the flow of fluids within the tank. During acceleration, turning, and braking, a large liquid-filled tank may produce unexpected forces on the vehicle due to the inertia of liquids.
∆_Danielsahn_∆'s Comment
member avatar

I have done it both ways, and stalled it both ways. For me, I guess it depends on the particular situation. Right or wrong, I will continue to do it both ways

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Tips For Shifting
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