My name is Tommy and I've got a really fun video for you today, because we are putting the all wheel, drive system of this Prius through its paces on the TfL roller tests. This prius is the all wheel, drive a model and in this first test, we're gon na get the rear wheels stuck in the rollers on purpose to see if the front wheels can pull us up on this first test, we're gon na go ahead and put the Rear wheels on the rollers there should be a piece of cake for the prius, of course, because the primary drive wheels are the front, so i'm gon na go in reverse gently back it on and then I'm gon na go into neutral and let the vehicle settle. I'Ve got this little display up here. That'Ll show me where the power is going so into drive foot off the brake onto the gas. Oh yeah, almost a perfect results, so no issues with the rear wheels on the rollers. Now I should explain how the all wheel drive system works on the Prius, because it's pretty wild here in the front, we have a gasoline engine, a 1.8 liter gasoline engine that develops 96 horsepower and that is paired with an electric drive system and all of this Powers the front wheels and then in the back, there's another electric motor with no mechanical connection between the front and the rear. However, the rear electric motor is just seven horsepower, that's right, one, two, three, four: five: six, seven that's all the power it can make, which is less than a lot of lawn mowers.
However, it does make forty pound feet of torque. Now the question I've always asked: if the front wheels get stuck. Does this little itty bitty motor have enough power to push us off a bad situation? Let'S get the front wheel stuck Music. The second test is going to be much harder because we are gon na put a lot of strain on that tiny rear motor, so I'm going to go into reverse and now I'm gon na back on to our front wheel, slip tests. So in this test, both front wheels are stuck in the rollers and the rears have to pull us off by themselves. Let'S see if they have the power, because under 10 horsepower is not a lot but 40 pound feet of torque. That should do the trick. So I'm in Drive nothing special selected here: foot off the brake onto the gas come on, so you can see in my display here it's definitely trying to send some torque to the rear, but not quite enough so I'm going to give it another go here. More gas, this time Music, come on foot to the floor now come on come on come on, so the front wheels are definitely spinning. Both front wheels are really spinning furiously, but no action to the rear. So let me try turning off traction control here. We'Ll give it another go. I think we're stuck I'm going to try turning traction control back on, because that didn't seem to make too much of difference.
Now, let me go into power mode, let's, see if that makes a difference here, but to the floor I'm completely. Full throttle now I'm completely stuck the little rear. Motor doesn't have what it takes to get me unstuck. So let me get some help and get off the rollers with the good old fashioned push all right. Matt let's! Do it so with the little push we got off, but the car couldn't do it itself? Well, perhaps that's unsurprising that tiny little electric motor didn't have enough grunt to get us unstuck, albeit a little disappointing, because the philosophy of it is sound. You see that little motor is only active at certain times when you're driving the car, so, for example, it's only active when you accelerate from a dead stop from about zero to six miles an hour and then it's active when the front wheels slip up to 40 Miles an hour at which point it cuts off altogether, but definitely a little disappointed. It doesn't have enough both to get you unstuck when the front wheels get into a bind. So let's go to a diagonal slip test. This is going to be opposite corner, stuck very common when you're out in the snow Music. This is the diagonal slip test, so two opposite wheels are going to be stuck in the rollers, in this case the rear right and the front left. This is very common when you're out to in the snow out in the mud or sand, but primarily snow in this car, all right so I'm going into neutral.
Let the vehicle settle, and this is going to have to force the brakes to actuate. The wheels are better spinning to send power to the wheel with traction so I'm going in to drive now traction control on just in my normal mode, make sure I'm. In my normal mode, yep we are, and here we go foot off the brake. Okay, it's. Definitely rocking it, you can feel the traction control. Try to get me unstuck. Oh bummer I'm, going to give it one more try here with traction control on well, we did eventually get unstuck, but that took a lot of work. Wow that took a lot of effort. A lot more than I think, I've seen any other car to get us unstuck from that test, but we did I'm not sure if maybe we slipped off the rollers after we got enough rpm up or what exactly happened. Let me know in the comments section below, but eventually we did get unstuck now it's time to up it up a notch or three because we're going on to the three wheeled slip test Music. This three wheeled slip test is super tough, so both rear, wheels stuck front right wheel. Stuck only the front left has traction so that's. The one that's gon na need to claw us off of this test in Reverse all right and into drive. Here we go let's see if we can figure it out, foot off the brake, it's thinking about it.
A lot of throttle now. Alright, not great I'll, try turning off the traction control just to see if that helps, yeah that's me than making it worse, I'll try. Turning it back on, what we want is the break to engage that front right wheel, which will force a torque to the front left butt. We were close there, but I don't think it's gon na happen put to the floor. Yeah, okay, Matt! You want to come. Give me a push. We are super stuck now all right. We'Re gon na need more manpower, all right, whoo we got off, but it wasn't pretty Music Music. Well, that was definitely an interesting result and I have to say I'm, just a little bit disappointed now. I know 7 horsepower doesn't sound like a lot for that rear motor, but 40 pound feet of torque sort of does. It should be enough to give you a grunt out of a bad situation and I'm, not sure it will now. The all wheel, drive system on the Prius is about 1000 options. So if it were my money, I might skip the all wheel, drive system and just buy a set of snow tires because that's gon na be a lot more effective. I think when the going gets really tough in the winter time.