For Sonic Racing yep, you'll have to know the tracks well and be able to get the drifting right for the boosting [you can actually switch directions while maintaining the boost, but you don't need to very often]. Usually level 1 boosts will do after most corners that would benefit - so don't slow yourself down too much/maintain the drift too long unless you are going at crazy speeds and could sacrifice a little speed now for a big level 2/3 boost shortly. If you hit the wall, it will cancel though so let go before then, the boost might help you escape collision and is better than no boost at all, and slowing down.
The drift button also works as a brake when you aren't turning - in case letting go of acceleration isn't enough to make the turn either.
Get a head-start, learn the timing on the count-down boost (when it lets you do it) - "get ready" - you should have already pressed it once lol! (then on the 3, on the 2 and on the 1 for maximum boost). You can tell by the glowing exhausts, otherwise dark smoke comes out. Keep trying even on the 1 if you messed up the rest. Timing needs to be a tad early.
Save an item that fires backwards when you can, in case someone fires something at you. You can also boost-escape but it's not always possible so don't rely on it - or practice lots!
Get a hang of drifting in the water too, it's useful for boosts. Air drifting is pretty tricky for boosting, but just for taking better corners it's beneficial. Tricks are helpful in the air for better positioning for corners/boost rings/items/quick responses but don't go overboard and slow yourself down. More for quick adjustments.
Use horizontal tricks when there isn't much time to land them. - like in that monkey ball track, with those 3 platforms that you drop onto, one after the other, just before you go into the water with the dropping balls.
Do an air trick while coming in from flying (aim for the upper part of the blue transformation ring) and when you land you'll get a transformation boost.
Helps me to use a kart and mod setup for races with a decent amount of speed and acceleration, control too.
Have fun though...
