The OEM ignition timing strategy works very well when applied to a stock car. However when moving on to a high power application, it can be difficult to work with and restrictive. RaceROM adds easy to use larger maps that boast a high precision load input axis for improved control and range. Additional supporting maps were also added for further safety.
The VR30DDTT platform uses a maximum Best Torque (MBT) timing ma, a base map (knock limited) and an ignition timing maximum allowed map to determine the base timing. It will choose the lowest value of the Base MBT or Max map and then apply the engine condition corrections and the knock detection correction amounts.
There is a safe mode (low octane) map that can be switched to if the car enters limp mode (From DTC's) or high knock levels have been sustained for a set period. The safe mode can sometimes be enabled if the vehicle is refueled but that is yet to be confirmed. The diagram below illustrates the basic control functions and major inputs however there are additional maps and parameters that go in to the system.
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