Just got a kayfun v4 early birthday present love it wished I'd got one sooner. What's the best coil to build for it on a mech. Got a 1 ohm at minute seems pretty good.
1 ohm is pretty spot on. Try play around with different diameter coils, as well as the gauge of wire too while keeping it at the same resistance to find what works best for you. At 1 ohm, you can run an 18350 battery no problem.