Main Motorcycle: '06 Speed Triple
Join Date: May 2010
Other Motorcycle: '96 Adventurer Cafe Racer
Extra Motorcycle: Not any more
If you start doing it, the idea is to match the engine revs to what they will be when you are in the next lower gear. I don't know the ratios or typical RPM on a T-bird, but lets say you are slowing down and at 2000 rpm in 4th; at that same speed in 3rd you might be at 3000 rpm, so you would blip the throttle up to (well, slightly above as the engine will slow down a bit before you get the clutch back out) 3000 rpm. Overdoing it is no better than not doing it at all.
But on the street, yeah, it mostly just sounds cool....
'06 Speed Triple
'96 Adventurer Cafe Racer
and a bunch of other stuff
If everything seems under control, you're just not going fast enough - Mario Andretti