Greddy BCC Installation Instructions
The control unit on the Supra TT has an internal boost cut which can only be removed with special programming. The alternative to this special programming is to use the Boost Cut Control from Greddy. This electronic device can be installed in Supra control unit. Tools/parts required: Phillips screwdriver, 10mm socket, wire clippers, crimping tool.
Precision Adjustment of the BCC Output Voltage Inside the BCC shell is a screw that provides adjustment of the peak voltage output. Since the ECU uses the TPS V data for many functions, you want this set only as low as needed to avoid fuel cut, and not unnecessarily lower. The setting as it comes from Greddy is usable but lower than necessary, and varies from unit to unit. You could roughly set it by just repeatedly driving your car at max boost and slowly turning the screw counterclockwise to reduce the peak voltage output until you no longer hit fuel cut. But this is a crude method compared to adjusting it precisely by measurement with a volt meter, as follows: 1. The Connections for Voltage Tune assume your BCC is uninstalled. To Volt tune after the BCC is fully installed, you will need to disconnect the BCC's green and white wires to proceed, but may leave the red and black wires installed. 2. Red BCC wire to any 12V source such as car battery + 3. Black BCC wire, and negative probe of your voltmeter, to ground of same battery. 4. White BCC wire to any automotive voltage source of 5-12V. Simplest is to use the 12V source same as red wire. Others have used the 6V output of a battery charger, doesn't matter because any Input of 5-12v to the BCC will give the same Output for a given adjustment screw setting. 5. Green BCC wire to the positive probe of your voltmeter. 6. Turn screw to provide voltmeter reading of Nearly but Not More Than: 4.3 V for 93-95 cars; 4.1 V for 96-98 cars.
Happy Boosting!
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