Off-The-Shelf Hacker: Too Much Torque Is Never Enough
There’s a reason my friends call me “Dr. Torq.”
As an old-school, American V8 hot-rodder, I really dig putting my right foot to the floor and feeling the efforts of my late-night Off-The-Shelf Hacker/mechanic/welder handiwork. Yup, I’m a physical results kind of guy. The more radical, and dare I say, violent, the better.
You might even call me an “acceleration junkie.”
Contrast that traditional notion of hot-rodding with current mass-market “advanced” automotive thinking.
Google is making tremendous progress with its autonomous vehicles, now under a project called Waymo. The self-driving cars tool around Silicon Valley and Austin, safely navigating everyday traffic without running into things. Leveraging the physical computing stack of microcontrollers, sensors, actuators, motors, networking, programming and so on to safely deliver families, kids and commuters to their destinations is a great and noble cause. It’s awesome technology, clearly with a bright and profitable future. Other tech companies are following suit, with similar ho-hum autonomous cars.
That said, I’ll need considerably more excitement and inspiration in my automotive life of the future.
Not surprisingly, the world of high-performance electric vehicles looks promising and is rapidly converging with Off-The-Shelf physical computing.
Zombie 222: Radical Inspiration
Recall, that we’ve discussed DC electric motors and electronic motor controllers (in conjunction with the Arduino) in a few past articles. The difference between those 12-volt projects and high-powered electric vehicles is really just a matter of scale. The electrical, mechanical and computing concepts are all the same.
How does 1,800 ft-lbs of torque and around 800 horsepower grab you? For the electrical engineers out there, the car’s motors pull 2000 amps at 400 volts. That monster is the Zombie 222. Here are a few ride-along clips for your entertainment.
Controlling the speed of the DC motors is through a 5K Ohm potentiometer attached to the motor controllers. The pot is mechanically connected to the gas pedal, in the car.
Putting those kinds of torque numbers through a Strange Pro 9-inch center section rear axle and then into a pair of street slicks, makes for nearly a religious experience.
The Zombie 222 will do 0 to 60 MPH in 1.79 seconds. It covers the quarter mile in 9.89 seconds with a trap speed of 141 MPH. Modified for top end, the car has recorded an astonishing 177.8 MPH.
Seems like high performance to me.
DIY Off-The-Shelf Parts
Around 6:04 in the video, he talks about developing better cooling systems and even creating a sound for the car. The physical computing stack sure goes off in unexpected directions, doesn’t it?
Readers will be happy to know that with a little research, they can buy off-the-shelf parts, and build their own tire-destroying electric ride.
The most current motor controller I could find was the Evnetics Shiva. This baby can throttle 3,000 amps continuously at 425 volts. That’s 1.2 Megawatts or around 1,600 horsepower. Of course, it REQUIRES liquid cooling and is pretty pricey at around $11,000 per controller. Controller characteristics are easily configured using any web browser over an Ethernet connection.
Medford used the Manzanita 2000 amp motor controller.
Likewise, EVWest also has the 11-inch DC motors. There’s even a 2-speed Powerglide transmission option. The dual motor setup is around $7,700.
As a comparison, a fully assembled and tested Nelson Racing Engine 572 cu. in. Hot Rod series crate motor delivers 750 HP and 720 ft-lbs of torque at a fairly reasonable $15,500. You can count on it being bulletproof. For a bit of insane over-the-top, turbocharged inspiration be sure to watch the crazy videos on the Nelson site.
Need More Convincing?
Even world famous top-fuel “Big Daddy” Don Garlits is onboard with electric performance cars. He’s using six GE motors, Manzanita motor controllers and 1,200 cells in the quest for 200 MPH on batteries. As you’d expect he’s a little further along than others working with 1.5 megawatts of power (2000 HP) and at the 3,600 amp level. If Garlits is doing it, chances are that it’s absolutely cool and bleeding edge.
The physical computing stack makes things happen in the real world. Whether moving a robot arm or spinning the tires on an off-the-charts electric drag race car, the engineering concepts are the same.
Might as well go big, because too much torque is never enough.