*Accelerating*
Tap A - 4-5 taps/second
Hold A on terrain if not during boost (ex. taj challenge)
Let go of A on zippers - some exceptions
Start Tapping A again in the middle colorful exhaust, you'll get the feel for it.
*Drifting/Turning*
Drifting is faster in many places
Drifting kills zipper boost speed
When turning after using a Zipper, using only B+R keeps your speed, but is harder to control