run hondata.
no rpm, activated switches!!!!
when a vtec ecu engages vtec, it adds more fuel and changes the ignition timing. It also safeguards ur engine, if its low on oil=no vtec, etc...
Non VTEC ecus with a rpm switch engage vtec if your engine is 3 quarts low on oil(they dont care, and will cause the engine to run lean.
non vtec ecu's dont rev out to what youd want to take it to anyway.