I used to do it, long time ago. Now I rarely do it. I only do it when spirited driving and in anticipation of a corner where almost WOT may be required to exit a corner at the desired RPM.
In DD I try and avoid doing it. Why? Simple, opposite torque loads:
A.
The increaset compresion does not help the engine, but that's small potatoes.
B.
The clutch generally likes engaging in one direction. When you downshift, it works against it's normal direction.
C.
All motor mounts, tranny mounts are designed to effectively handle torque in one direction. Again, downshifting fucks them up.
D. Differential gear R&P toe and hill contact is reversed when downshifting.... blah, blah, blah...
Need I go on?
In DD I try and avoid doing it. Why? Simple, opposite torque loads:
A.
The increaset compresion does not help the engine, but that's small potatoes.
B.
The clutch generally likes engaging in one direction. When you downshift, it works against it's normal direction.
C.
All motor mounts, tranny mounts are designed to effectively handle torque in one direction. Again, downshifting fucks them up.
D. Differential gear R&P toe and hill contact is reversed when downshifting.... blah, blah, blah...
Need I go on?
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