The Spirals Plus tank is an interesting beast, in that it offers coil types with very different profiles. The 0.6 ohm coil has a much narrower inner diameter and from that you can see that it is intended for a more restricted lung hit, even MTL vaping.
After priming the coil itself, filling up the tank and waiting, I start off at around 18 W and work my way up. I’m vaping Cloud Corp’s Mereen e-liquid, a melon-infused, fruity blend, with a ratio of 70 VG/30 PG. Shout outs to Blair and Reece for the samples!
As DJLsb mentions in his video review of the tank, the small juice holes on the coil housing could lead to problems in wicking thicker e-liquids. And although 28 W is the recommended “best” setting for this particular coil, I start to get dry hits at this wattage. My personal sweet spot was around 23 W. At this wattage, the tank functions very well and the flavors are great. I would describe the hit as somewhere between mouth-to-lung and a restricted lung hit.
The tank has an airflow ring and four inlet holes. Sliding the ring to close off airflow closes all holes simultaneously. While this intensifies flavor and raises the temperature of the vape, the tank does whistle when airflow is closed off. This didn’t annoy me with headphones on, but expect a canine chorus if you live with dogs.
The 0.3 ohm coil has a wider inner diameter, and is more of a direct lung vape. With this coil, flavor is great, vapor is dense, almost creamy, and the clouds ain’t bad either. My favorite wattage on this coil was between 40 – 43 W and felt like the perfect marriage of flavor and vapor production. To be sure, it’s not a cloud machine, but at 40 W, what is? For the wattage that you run the Spirals Plus tank at, it certainly puts out.
Finally, the RBA core. Simply having this option is a big plus in my opinion. However, there is definite room for improvement. The deck holds a single coil in place with two cross screws. Although there are replacement screws in the kit, they all have the same size head. You’ll be able to hold a Clapton wire or similar in place, but anything thinner will be tricky without chunkier screws.
Even with the Clapton wire that was pre-installed, my ohm readings were all over the place – anything from 0.6 ohm to 0.3 ohm! This can be corrected while you have e-liquid in the tank by unscrewing the top cap and tightening the screws, but hold the tank glass down as doing this loosens the whole construction. The screws are small and fiddly, and can be easily stripped if you overtighten. Also pay attention that the end of the wires don’t extend too far out, or you risk an atomizer short.
As a final note I would add that even though the installed Clapton coil came out around 0.6 ohm for me, due to the larger e-liquid inflows the RBA can be run at a higher wattage than the 0.6 dual-core coil. I vaped on it up to 40 W with no problems. But the tank will leak if you puff into it while firing to prime the coil, so watch out for that.