[quote=Matty]For info, I suspect a Power Shift is just a very quick change when going up the box, that sees the clutch re-engaged as quickly as possible, compromising drive-line smoothness for speed of change and overall gain of velocity, drag-racer style. Going down the box should be via double-declutch of course,as every gentleman racer should know
. Or Heel-&-Toe if you need to loose speed too.
With old non-syncro boxes, double clutching is of course the ONLY way to downshift and it is a fine art that has to be learned the hard way.
But with the syncromesh gearboxes, like the Miata 5spd, double clutching is just redundant and a time wasting procedure. With the blocking rings inside the trans, when you push into a gear the blocking ring slips on the next gear and with that friction it speeds that gear up to match the exiting gear in speed. Hence no more grinding gears when shifting.
Speed shifting or power shifting is again like double clutching, an art that needs to be mastered. I can't imagine what I would do with a left hand shift lever after spending my whole lift with a right hand shifter. At least your pedals are the same...
