If you're hunting for a solid way to modernize your project car's steering, snagging an mr2 electric steering pump is one of those upgrades that just makes sense once you see it in action. It's funny how a part from a 30-year-old Toyota has become the go-to solution for everyone from weekend drifters to high-end restomod builders. If you've ever looked at your engine bay and hated how that bulky, belt-driven power steering pump crowds everything, you've probably already thought about deleting it. But nobody really wants to go to a manual rack on a heavy car—that's just a workout nobody asked for.
That's where the MR2 unit comes in. Instead of relying on a pulley and a belt tied to your engine's RPM, this pump runs off your electrical system. It lets you tuck the power steering assembly away in a corner, maybe under a fender or in the trunk, and gives you back a little bit of horsepower that was being sapped by the parasitic drag of the old belt.
Why the MR2 Pump Specifically?
You might wonder why people don't just grab a pump from a modern Prius or some other new electric car. Honestly, it comes down to how these things are built. The mr2 electric steering pump is a self-contained, electro-hydraulic power steering (EHPS) unit. It has its own motor and reservoir all in one neat (albeit somewhat heavy) package.
Most modern cars use EPS (Electric Power Steering), where a motor sits right on the steering column or the rack itself. Swapping an entire column or rack into an older chassis is a massive headache involving crazy fabrication. The MR2 pump is different because it still uses hydraulic fluid. You keep your existing steering rack, you just change what's pushing the fluid through it.
There are actually two main versions people go for, and choosing the right one depends on what you're building.
The SW20 "Big" Pump
This is the one from the 1990-1995 MR2. It's a bit of a beast. It's heavy, it's loud, and it looks like something that belongs in an industrial factory. But man, it's tough. People love these for drift cars because they can handle the abuse and the high pressures needed for fast steering transitions. It's a brushed motor design, which means it's relatively simple to wire up if you just want it to be "on" or "off."
The ZZW30 "Small" Pump
Coming out of the 2000-2005 MR2 Spyder, this one is the "sophisticated" younger brother. It's significantly smaller, lighter, and uses a brushless motor. It's also much quieter. If you're building a clean street car and space is tight, this is the one you want. The catch? The wiring is a bit more complex because it likes to talk to a computer (ECU) to decide how much assist to give. However, the aftermarket has figured this out, and you can buy little controller boxes that tell the pump what to do without needing the original Toyota brain.
Cleaning Up the Engine Bay
One of the best feelings in a project build is finally getting rid of those messy hydraulic lines snaking across the front of your engine. When you switch to an mr2 electric steering pump, you're essentially "divorcing" the steering from the motor.
If you're doing an engine swap—maybe a K-swap into a Miata or an LS swap into something small—engine bay real estate is at a premium. By moving the pump to the wheel well or even behind the bumper, you open up room for a bigger radiator, better intake routing, or just a cleaner look. Plus, you don't have to worry about finding a specific bracket to mount a power steering pump to an engine that never came with one.
The Power Factor
Let's talk about the "free" horsepower. It's a bit of a myth that you gain 20 hp by deleting power steering, but you definitely gain something. Every belt-driven accessory puts a load on the crankshaft. By switching to electric, you're shifting that load to the alternator.
The real benefit isn't just the peak power, though; it's the consistency. Since the pump isn't tied to engine speed, you get the same level of steering assist at a 700 RPM idle as you do at 7,000 RPM. If you've ever felt the steering get heavy during a low-speed maneuver in a modified car, you know how annoying that is. The electric pump keeps the pressure steady regardless of what your foot is doing on the gas pedal.
Installation Isn't Exactly Plug-and-Play
Don't get it twisted—putting an mr2 electric steering pump into a car that wasn't designed for it takes some work. It's not just bolting it on and calling it a day.
Dealing with the Amps
The biggest hurdle is the power draw. These pumps are thirsty. They can pull 60 to 80 amps under full load (like when you're at full lock). If you try to wire this into your cigarette lighter circuit, you're going to have a very bad, very melty day. You need thick, 4-gauge or 8-gauge battery cables, a beefy relay, and a proper fuse. Most people run the power directly from the battery or the main distribution block. If your alternator is already struggling to keep up with your headlights and stereo, you might need to upgrade that too.
Plumbing the Lines
Since the pump is now in a new location, you'll need custom hydraulic lines. Most people use -6 AN high-pressure lines. You'll need an adapter for the pump's output and another for your steering rack's input. Don't cheap out on the lines—steering fluid is flammable, and if a line pops over a hot exhaust, you're going to see some literal fireworks.
The Noise Factor
I should probably mention that these pumps aren't silent. The older SW20 units have a distinct high-pitched whine. Some people think it sounds like a fuel pump on steroids; others find it annoying. If you mount it directly to the frame rail without any rubber isolators, that vibration will hum through the whole chassis. Using some simple rubber bushings for the mounting bracket makes a world of difference.
Handling and Feel
Some purists argue that electric pumps ruin "steering feel." To be fair, if you're used to a perfectly tuned hydraulic setup from a Porsche, you might notice a difference. But for 99% of us, the mr2 electric steering pump feels great.
The coolest part is that you can actually tune the feel. If you're using a controller with the ZZW30 pump, you can dial back the assist. If you want it to feel heavy and communicative on the highway but light when you're parking, you can set it up that way. Some guys even wire in a "speed signal" so the pump slows down the faster you go, which is exactly how modern high-end cars do it.
Is It Worth the Hassle?
At the end of the day, is the swap worth it? If you're just driving a daily driver and the stock pump works fine, probably not. It's a lot of wiring and plumbing for something you won't notice much.
But if you're building something special—a track car, a show car, or a weird engine swap—the mr2 electric steering pump is a lifesaver. It solves so many packaging problems and gives you a level of flexibility that you just can't get with a traditional setup. Plus, there's a certain "cool factor" to opening your hood and seeing a simplified engine with fewer belts and hoses. It just looks professional.
Just make sure you do your homework on the wiring. Buy a good relay, use thick wires, and mount it somewhere it can get a little bit of airflow. Do that, and you'll have a steering setup that'll last another 30 years.