Shifting without the clutch

[SAV912]

Originally Posted by ddongbap

Anyone else know why clutchless shifting is bad for syncros?

It was just explained to you above. Synchromesh is there to help ease the transition between gear changes. The gears in the half of the transmission that can freely rotate are the ones that come into factor when you rev match and the shift lever freely slides into place. Those gears of the transmission can be freely rotating, or locked to the shaft. The synchros ensure that the speeds of the two shafts/gears are matched perfectly before letting the gears engage.

When you rev match, you are doing the work of the synchros by yourself but still putting excess force on the synchros, but if you mis-rev even slightly and still attempt to shove the shifter into gear and get an awful grinding noise, you are putting wear on not only the synchros, but the gears themselves as well. Sooner or later, you'll start wearing teeth off the gear itself, and eventually, whether or not you rev match perfectly, you will grenade that gear in the transmission. And other gears in the transmission don't like it when there is bits of broken gear roaming freely.

By all means, if you think you can rev match perfectly each and EVERY single time, go nuts. It's not my synchros you're eventually going to destroy. It's yours. So if giving your left leg an exercise during a drive is not worth it to you, then best of luck footing that new transmission bill. You probably should've invested the extra money in an automatic Yaris anyway, if that's the case.

-SAV