Electronic Boost Controller Comparison - Product Test

Controller: GReddy PRofec-A
Fuzzy logic boost controllers have been out for quite a few years. The claim is that they "learn" the response characteristics of your turbocharger, and can thus build boost faster, and hold it with greater stability than conventional control methods. In reality, however, controllers based on this technology tend only to work on fundamentally stable turbo systems. This means no boost creep nor fall-off, and no sequential set-ups. Additionally, any modifications that may affect performance like a different air filter or exhaust, require the controller to re-learn the boost curve.

In the case of the PRofec-A, running through the learning process is really no big deal. You either need a good clear length of open road, or a dyno to do the required third gear acceleration runs. After a half-dozen pulls, it was clear the PRofec wasn't happy about our car's boost creep, and required us to use its alternate learning procedure. This involved tweaking an impossibly small dial on the face of the unit with the provided screwdriver, until the built-in boost gauge matched up with our aftermarket unit. With learning complete, you simply dial in your desired boost level and away you go.

In PRofec speak, "Over Take Boost" means scramble. Setting it up is a breeze with the exception of the visit back to Lilliput to turn another pair of dials. Once set, the mode can be activated by momentarily pressing yet another tiny button on the face of the controller. Holding the OTB button down will engage Hi Boost mode, which raises boost to the OTB level. GReddy offers a very cool optional wireless remote switching system that can activate OTB, toggle from high to low boost, and even activate a nitrous system or line lock. If you plan on using the OTB mode, consider the remote switch mandatory; you have no business fumbling around the dash for a little button while driving fast.

The final feature offered in the PRofec is an overboost warning alarm and protection function. If the boost exceeds a specified amount for more than one second, the system will drop the control pressure to the base boost level until the manifold pressure drops below the alarm point. This occurs in addition to visual and audible alerts.

Aesthetics: Very compact design, basic black.

Ease of installation: Yes.

Clarity of Instructions: Basic but complete, nothing application-specific. Available on Web site.

Features: Fuzzy logic, "overtake boost control," boost gauge, limiter and alarm.

Performance: No better than a ball valve.

Support: Helpful customer support, answered phone the first time and provided quick and accurate information.