ok so I replaced my honda civic d15z4 engine with a d16A.

Apparently VTEC engages at 5500rpm on these engines.

My car is still practically standard, I'm not sure if it does switch over, if it does, the sound is very subtle, but I'm not sure that the place I bought the engine from gave my mechanic a matching ECU (I'm not sure whether I would need the same ECU to run this engine in my car)

So my question is, will the VTEC switch over happen without the PBB-J61 ECU that the d16A was released with?

I replaced my honda civic d15z4 engine with a d16A.

Apparently, VTEC engages at 5500rpm on these engines.

My car is still practically standard, I'm not sure if it does switch over, if it does, the sound is very subtle, but I'm not sure that the place I bought the engine from gave my mechanic a matching ECU (I'm not sure whether I would need the same ECU to run this engine in my car)

So my question is, will the VTEC switch over happen without the PBB-J61 ECU that the d16A was released with?