It’s been brought to our attention by a couple customers that there are a couple companies building “knockoff” power steering conversions for the S30 Z car. As a business owner, I’m a firm believer in “building a better mousetrap.” However, in these instances, here’s what you need to know.
Some of these systems utilize an inferior motor setup. Typically, the electric steering motor being used is referred to as a “Uni-Steer,” and while it’s great for ATVs, farm implements, and go-karts, it is NOT designed for automotive use. Period. Zpowersteering uses a steering motor that is designed for, and used in, modern automotive applications. We’re flattered that they like our design enough to replicate it, but be advised that you get what you pay for. The motor alone (new, not refurbished or junkyard-sourced) for our unit costs over $600.
We receive frequent inquiries about speed-sensitive power steering. Great question, and one that should be addressed honestly and thoroughly. In simple terms, it is unnecessary. Here’s why: Speed-sensitive systems rely on a wheel sensor (such as those used for ABS and TCS on a modern car). The Z never had these, so they’d need to be retrofitted. Aside from the extra work involved, what happens if you experience wheelspin? How about a sharp curve, where the inside wheels are rotating much slower than the outside wheels? Your readings will be inaccurate, and should not be relied upon. Furthermore, above a certain speed, there is no need for power assist… so why utilize a speed-sensing system?
ZPS uses a much smarter solution. Our proprietary system continuously senses and measures the torque differential between two inputs: Your hands on the wheel, and the tires on the ground. When there is a disparity between these values, our system applies electric power to the motor, creating steering assist, and allowing consistent, smooth steering input that remains constant and linear. It is a “need-based” application of power, rather than being based on an irrelevant value such as vehicle speed. When you need it, it’s there. When you don’t, it’s not.
Before we ship each unit, we test the completed system on a test bench that simulates YOUR particular car. Each “brain box” is calibrated to the motor and column that it is attached to, and the potentiometer is adjusted accordingly. Voltages are tested and torque output is measured in order to ensure trouble-free operation after installation. These processes add time and complexity to the finished product, but ultimately, we believe the ZPS kit deserves the same care and attention to detail that your Z deserves.
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