Having worked with Subarus I
Having worked with Subarus I can notice that the Traction control was not deactivated on the Subaru. With the Traction Control active, it will limit acceleration when it detects wheel spin. This means you can have your throttle at 100% and it will not give you 100% acceleration until wheel spin has been controlled. Further more it activates brakes on individual tires until they are all spinning at the same speed. when you deactivate the Traction Control (as is instructed to do so in snow driving in the manual) the engine management system of the Traction Control is deactivated. As with any low friction surface you do not want to lose momentum so deactivating the Traction Control is necessary to keep forward movement. snow, mud and sand dune driving) This Subaru is obviously not accelerating due to loss of traction and Traction Control not being deactivated. We can deduct one of two possible scenarios. 1 the Toyota's Traction control was deactivated and the Subaru was not. Or Toyota's traction control was not deactivated and is a system that does not incorporate some kind of engine and throttle management to control loss of traction.