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not to be pedantic (I know, too late, sorry!), but RPM is simply an abbreviation of Revolutions Per Minute. anything that spins has a RPM (even a record player, that's why you'll see records that have a number on them, that's the RPM you have to set to the table to play the music correctly). you'll notice in my description that I call out engine RPM, input shaft RPM, or output shaft RPM.RPMs=engine speed
anyway, you're definitely right, the most common thought of RPM is engine RPM because of that big honking tachometer on your dash that shows engine RPM.
to bring it back on topic... when I went out to get lunch today I forced myself to use IMT, it seems if I clutch in and shift to any lower gear within a specific time variable the engine will blip appropriately, but if you don't shift within a specific time of depressing the clutch pedal, it won't blip, also, the blip is not related to when I take my foot off the clutch. so it presents some scenarios:
foot on clutch, let car coast, downshift and let off clutch = no IMT blip
foot on clutch, shift to lower gear, do not let off clutch = IMT blip, but is useless and when you decide to let your foot off the clutch you still need to give it a blip
foot on clutch, shift to lower gear, let off clutch immediately = IMT and doing everything the way Toyota wants you to
so as long as you don't shift gears until you are absolutely ready to, IMT won't play the way you might want it to, but it is very predictable.