When a turbocharger and intercooler deliver more air to the engine, more fuel is needed to extract the potential power-especially in street/strip/race applications. The Rebic IV is an auxiliary fuel-injector controller that works independent of the factory electronic control unit. GReddy's "black box" can be used in any forced-induction setup to supply more fuel under high boost. The Rebic IV maintains safe air/fuel ratios, while supplying up to eight additional injectors. Its modular designs lets you use the Rebic IV with other GReddy control devices. We've found, to our delight, that enthusiasts rave about the Rebic IV graphical, dynamic user-interface and how it adds a "cool" factor to even the best interiors.

The map shows the correct amount of fuel compared to the engine RPM and the boost pressure. Left axis shows engine RPM, right axis shows boost pressure and the vertical axis shows fuel amount. The green shows the area which the stock ECU can cover. By controlling the additional injectors with the Rebic IV from specific engine RPM and boost pressure, it is possible to provide and maintain the correct air/fuel ratio during high RPM and high boost driving conditions (shown as purple). With the now built-in simulator, it is possible to adjust the fuel corresponding to the engine RPM, between specific points which makes a excellent upgrade for turbo systems.