I think my friend told me powershifting is when you dont take your foot off the gas when shifting, that sounds like it would be bad lol.
Oh but that's still using clutch! Basically, ur shifting the gear and inbetween u don't let off the gas so the engine is free revving. And when u engage the clutch again, it'll ride/burn the clutch a bit, but it supposedly gives you a faster run.
I've done that before and the result is chirping your tires and hitting redline earlier. I was crusing w/ a couple friends yesterday night and I basically chirpped my tires from 1st thru 3rd (hit 110 in 90 area, so not excessive speeding)... I don't really know how/why my tires keep chirpping becuz i was just shifting at redline... I think most people disengage clutch, let off gas, then shift and finally engage clutch. Well, in my case, the tach only fell by a little bit b4 i completed my shift so I didn't let it go out of vtec =0
So i went home and tried to analyze the "physics" behind my chirping tires... Maybe becuz I let off the clutch fast so the sudden change in "inerta/speed" forced the tires to "suddenly" slow down and then speed up again. Thus producing the "chirping" sounds?....
clutchless shift (check)
up/down shifting (check)
power shifting (w/o letting off the gas - check)
hmmm, gotta go find something new to learn and pratice on the car. Imho, getting heel/toe "perfectly" is very very difficult becuz it's a bunch of motions all together, and you have to make it smooth