For matching the RPM in a downshift using the clutch:
1. Disengage the clutch
2. Shift into lower gear, still keeping the clutch disengaged.
3. Apply throttle to increase the RPM of the engine, the goal being to match the RPM of the engine to the current wheel speed at the new gear ratio you have just selected. This takes practice to get bang on and the difference between each gear isn't the same. Over revving it will cause a bit of jerkiness when you engage the clutch again. Under revving it is still better on the clutch then not applying any throttle at all, as the clutch will have to make up for less of an RPM difference through slippage.
4. Engage the clutch once you feel that the RPM are close to the RPM that the engine will be at once the clutch is fully engaged.
Using this method, you can actually downshift without even touching the clutch. The shifter will easier slide out of gear right when you let off of the gas, as it creates a moment when there is no load on the transmission. Once out of gear, apply throttle to match the RPM. When you are close to the correct RPM, apply light pressure to the shifter against the gear you want to shift into. When the RPM matches the wheel speed, the shifter will slide right into gear.
Shifting without the clutch is easier when shifting up gears. Simply slide it out of gear when letting off the gas and apply light pressure to the shifter against the next gear. Once the RPM drops to match that gear, the shifter will slide right into it.
Most people can't believe it when they realize I'm not using the clutch and think it's terrible for the transmission. I disagree. I've been doing it for the past 50 000 km. I just recently changed my trans fluid and it was clean, with no signs of metal particles or brass contamination from the synchros. When done correctly, there is no grinding or lurching while shifting without the clutch and it feels way smoother than shifting with the clutch.
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