I have a 2009 Subaru Impreza 2.5i what happens if I turn off the VDC

Honestly, l would not mess around with a Subaru, if you were to screw something up Subaru cars are very expensive to repair.

simply put VDC is justs a fancy term for Traction Control, turn it off & all the power goes to the wells, it is up to u to..well.control it!

here is a more complicated explanation:

VDC is Vehicle Dynamics Control VDC is composed of 2 main systems: VTD plus VDC full time 4 wheel traction & engine management. VDC is traction control that senses vehicle direction & uses brake, throttle & engine management to help maintain stability. The components of the VDC system are: all wheel drive using the VTD system. When the wheels r spinning without traction or the vehicle is not going in the direction it is being steered, the VDC system kicks in. Direction: uses brakes to slow down wheels to reduce spin & help control vehicle direction. Skidding: yaw & steering wheel sensors use brakes to slow down spinning wheels & re-direct power to the wheel(s) with the best traction to re-gain control. Engine power use engine output to slow spinning by reducing spark to cylinders to cut back power & help re-gain control.

Read the owner is manual; best source of information.

ull most likely spin out or loose traction going round a corner so if u like 4wd or fwd or rwd drifting u can do that if not just keep it on

The car will do what you tell it to. No computerized big brother to get in the way of your powerslides.