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Difficulty: MediumUpshifting and Double Clutching

When operating a manual transmission, correct double clutching ensures smooth gear engagement without grinding. In what sequential order should a driver perform the fundamental actions to complete an upshift from start to finish?

  1. 1Release the throttle and press the clutch pedal to move the shift lever into neutral.
  2. 2Let up on the clutch pedal while remaining in neutral to let the engine and input shaft decelerate.
  3. 3Push the clutch pedal down again as the engine RPM drops to the required speed for the next gear.
  4. 4Slide the shift lever smoothly into the next higher gear position.
  5. 5Release the clutch pedal smoothly while simultaneously applying pressure to the throttle.

Answer

The proper sequence begins by easing off the throttle and pressing the clutch to shift into neutral, releasing the clutch pedal in neutral to let the input shaft slow down to the target RPM, depressing the clutch again, shifting into the higher gear, and finally releasing the clutch while applying throttle.
Executing a proper double-clutch upshift requires releasing the clutch pedal in neutral so that engine braking slows down the transmission input shaft to the exact rotational speed needed for the higher gear ratio before shifting into that gear.

Step-by-Step Solution

1
Release the accelerator and push in the clutch pedal to move the shifter into neutral.
The vehicle disengages from the lower gear without driveline shock.
Relieving drivetrain torque allows the shift lever to slip freely into the neutral gate.
2
Release the clutch pedal completely while the transmission remains in neutral.
The engine and transmission input shaft spin together as engine RPM naturally drops.
Higher gears require lower engine RPM at a given road speed, so the input shaft must decelerate to match the higher gear.
3
Push in the clutch pedal a second time when the engine speed reaches the matching RPM.
The input shaft is isolated from the engine at the synchronized rotational speed.
This second clutch depression allows the shift collar to engage the next gear without gear clashing.
4
Move the shift lever into the next higher gear slot.
The transmission locks into the next gear ratio smoothly.
Gear teeth align easily because rotational speeds are equalized.
5
Release the clutch pedal smoothly while simultaneously pressing down on the accelerator.
Power delivery is restored to the drive axles.
Smoothly applying power prevents sudden vehicle surging or clutch plate slipping.

Key Concept

Double-clutch upshifting procedure and intermediate input shaft deceleration
Estimated Time:1m 0s
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Topics

Upshifting and Double Clutching

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