Protection Parameters

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Engine protection parameters.


Boost Cut

The boost cut is designed to prevent engine damage from over-boosting. It has two settings - a cold boost limit and a hot boost limit.



The cold boost cut operates below the cold/hot transition temperature; the hot boost cut operates above the transition temperature.  In this way the engine can be protected from boost when not fully warmed up.


When the boost cut is triggered fuel is immediately cut to the engine, as per the main rev limiter. When either engine speed falls below 2000 rpm or the throttle is released, the rev limiter is removed.


With a stock MAP sensor the maximum level for a boost cut is 10.5 lbs. This must be less than the maximum range of the MAP sensor (~11.3 lbs) so that the MAP sensor is capable of sensing when the manifold pressure exceeds the boost cut limit.


To disable the boost cut set the units to kPa and enter a value of 0 for both hot and cold boost cuts.


Overheating Protection

Overheating protection attempts to protect your engine from damage via overheating. Note that it will not prevent the cause of the overheating in the first place!




Radiator fan temperature forces the radiator fans to switch on when the coolant temperature is above the specified temperature. Note that the ECU should not be the only method used to switch on the radiator fan - a fan therm-switch is required.


Overheating temperature is the temperature above which the engine is deemed to be overheating. Set this above the normal operating temperature of the engine.


If the engine temperature exceeds the overheating temperature, then one or more of the following actions are taken:


Add extra fuel - this enrichens the mixture in an attempt to cool the engine. Note that this will not usually cure the overheating condition.


Generate P0217 error code (engine overheating) - will generate an error code which can be read with KManager or an OBDII scan tool.


Illuminate the MIL - switches on the MIL (check engine light) when the engine over-heats.


Go into 4000 rpm limp mode (optional) - this will rev limit the engine to 4000 rpm. This is not recommended for race applications.


Warn driver by cyclically applying a brief rev limiter (optional) - this will briefly rev limit at around a 1 second interval. The rev limiter is very brief and the driver will feel this as a slight hesitation, especially under full power. Idle and low load running is not affected.