So, while digging through my vape drawer today (a task in and of itself, I'll tell you), I found an older GS Air coil (1.5 ohm) sitting by itself in a pack. I'd forgotten it was there. Haven't hit one of these in a while, so I thought I'd give her a shot and see if memory served correctly. For some time now, I've be using primarily my 1.5 coil rebuilds (generally at 1.1 ish ohms), my new 1.2 rebuilds (somewhere in the 0.9 to 1.0 ohm range), and have been trying to use up my pile of new 1.2 ohm coils (to make some rebuild fodder for the feline zombocalypse). I haven't actually vaped a 1.5 ohm prebuilt in several months.
I dropped wattage from my normal 20 down to 15 as to not fry the coil. I always had issues getting the 1.5's up beyond 18 watts with my max VG liquid. Even though I'm using Reaper Blend for this experiment (70 PG liquid), I decided to keep the wattage low. Primed the coil, let her sit in the tank for a bit, and took a few small pulls to get her going.
First impression: where's the flavor? Really, the difference in flavor production between the silica wicks in this coil and the prebuilt 1.2 ohm coils an their cotton wicks is quite noticeable. I know exactly what the juice is supposed to taste like: I've vaped it for some time, now. Maybe it's the 15 watts? Nope. Cranked it up to 18 watts (the max I ever reliably got out of these coils) and the flavor improved, but only very slightly. For giggles, I moved her to 20 watts. Still noticeably muted. Even at 20 watts. And I got one or two dry hits at that wattage (no burnt hits, though). Even with a 70/30 liquid, these coils can't reliably handle 20 watts.
So, a month-ish into using only the new coils and new rebuilds, it's pretty staggering what the difference is in retrospect. With the stock 1.2 ohm coils, I can vape 100% VG at a HOT and toasty 25 watts with no issues. The older coils won't do 20 watts reliably with a pretty thin liquid. Then there's the flavor. I think the cotton and larger wicking channels made all the difference. Even in my horizontal 1.5 rebuilds, flavor is outstanding. That silica just does something to the juice and mutes it down.
Just a little experiment. Now let me gut this coil and turn it into something more usable... give it a real purpose. A buddy of mine just got into vaping and I gave him my spare GS Air M, and since I have a decent stockpile of 1.2 rebuilds now, ALL of my rebuilt 1.5 ohm coils. I'll show him how to rebuild his own, too. Man, fish, show, teach... that whole thing.