Vehicle Jump
A vehicle jump is a technique in Jak II and Jak 3 that exploits a vehicle's hover zone mechanic to send Jak high into the air. The trick is performed by moving into the upper hover zone and dismounting the car while it is accelerating upwards. If done correctly, the vehicle's increased speed will compound with Jak's jump, causing him to leap significantly higher into the air than intended.
This trick works best on the single seat zoomers.
Tutorial
Mount a single seat zoomer and enter the lower hover zone. Press R2 to then enter the upper hover zone. Right before the zoomer reaches its peak, dismount with Triangle and continue with a jump and a spin.