Installation of this kit is very simple and straight forward, but there are a few things you need to understand about what you and your vehicle are doing when this Brake Boost kit is in use. ‘Brake Boosting’ is the act of building boost while holding your speed steady by applying the brakes on the vehicle. In stock form, this is not possible as the ecu closes the throttle when the brakes are applied, regardless of pedal position. Because this kit allows you to go WOT (Wide Open Throttle) with the brakes applied, it’s possible to make as much torque as your engine/turbo setup is capable of while at a steady speed. As you can imagine, this is hard on the brakes. Excessive use of this system WILL cause brake wear. Because of the incredible braking system on the R35, you have the ability to ‘hold’ over 850lb/ft of torque easily!
There appears to be a misconception that this is hard on the clutch, but this is false. ‘Brake Boosting’ is no harder on the clutch than making full boost under acceleration. If your clutch is inadequate then you will have issues regardless.
It’s highly recommended that you test the brake boosting while datalogging and later review the logs for knock. Holding an engine at full boost at a steady rpm is harder on things and will make tuning that much more critical. While brake boosting it is possible for the engine to see load in areas of your fuel and ignition maps were not seen on the dyno, and consequently areas of the tune that need to be ‘fine tuned’. If you record engine knock while brake boosting, send the log to your tuner and have the tune corrected.
We DO NOT recommend using this in Auto mode on the transmission and letting it downshift while on the brake.