Your VR4 heavily modded?
Have not use NGK7 before but have tried Denso Iridium IK22 which is about NGK7 heat range. To me not much difference since my VR4 is standard stock engine. Currently using back NGK6 heat range only....
I Have a 4G93T 1.8 GDI in Lancer and the engine is pinking some times, I can only get 96 octane fuel, can I retard the timing by moving the crank angle sensor on the exhaust cam, or is there some other way.