I finally figured out how to get this on Speedbowl and it's repeatable.
Vehicle : CYGON Tempest (level 19 unlock)
Speed Demon
Liddo 5 / Speedbowl / Rating : Easy
Number of laps : any (at least 5 so you can try over and over)
Number of Combatants : 2
Puckups and Catchup on
Destructible off
Engine Power : WILD
For the first lap Just do it normal on the main ring, getting 3 turbos. One powered up and one regular. On lap 2 ride around and hit the boost pad in the center of turns 1 and 2. As soon as you hit it use your regular turbo. Once you get on the backstretch hit all of the boost pads, use your button boost and the powered up turbo. You should get Mach 1 by the time that turn 3 comes up.
Here's a video of me doing it and the fastest I've gone.
https://1drv.ms/v/s!AsUOa7YS1T9Ps80zaJQoWKPAsQ-X-w