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RB25DET Variable Cam timing range / activation


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If it is a fully continuous VVTi motor like a NEO motor then it will need special control.  If it is an older engine then it is just switched.  Best way to set it up is on a dyno, then it can be optimised to your other mods.  Do a run with the cam retarded, then one with it advanced, the switchover point required will be quite clear...  Usually they are RPM switched, but sometimes people add other parameters.  I imagine the factory do quite clever control, but in practice switching off just RPM is usually adequate...

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