Hey iPV D2...
One thing to know is that it will not fire below 3.6V in Power mode as it has no buck capability. If you put a 0.2Ω build on it, the D2 will fire that coil at 65W regardless if you have it set to 25W or 45W... Which might not be a problem or not, a 0.5Ω you can fire it at 26W or higher, a 1Ω will start at 13W and so on...
With that in mind you can't VERY LIGHTLY ( a very, very dim, dull red and only in the center) pulse a Ti coil at 7W in Power mode to clean it. You can either use a different mod or build a new coil when it gets gunky.
The TC mode of the D2 does not have this issue with minimum voltage and works great! You have to keep in mind that the TC resistance range is very small 0.05Ω - 0.3Ω which will limit you as to the coil size you are building and the device. Ni 200 is super soft and has an ultra low resistance, gives off really nasty **** if it glows red like a Kanthal dry burn. It also has to be spaced, no contact coils. Ti Grade 1 is much better, a lot higher resistance, is stiffer and springier than Kanthal. You can make spaced or contact coils with Ti and it's nicer to wick but since the resistance is higher you will hit the 0.3Ω limit quickly depending on your build. Ti will also give of really nasty **** if dry burned like Kanthal, but not as bad as Ni 200.
SS 430 is the cats pajamas now for TC wire. Can be dry burned like Kanthal without issue, spaced or contact coils, it can also be use in VW mode just like Kanthal and has about 65% of the resistance. For TC if you don't have a mod where you can edit the TCR profile (DNA 200) then you will have to play with the temperature settings to find the spot where your cotton won't burn on your specific mod.
Don't even think about this one here!
The eVic VTC mini looks great, has an AMAZING screen and a really nice feel to it. The only problem with it is the TC does not work properly, after you let it go to sleep all subsequent hits are anemic and totally useless. You might just as well vape an eVod for better satisfaction. When you remove the atty, reset the resistance put the atty back on and lock the resistance again it will vape fine till is goes to sleep, then rinse and repeat. Many letters have been sent to Joyetech about this issue with no reply. Not all units do this so it is a manufacturing bug and a dice roll to see if you get one that works or not. I would stay far away from it for TC.
(If you can get one cheap like for $29 from www.efun.top the it is a great VW mod with a cool bypass mode and now goes to 75W with the new firmware.)
I fixed the TC on my eVic VTC mini by exchanging it for a second iPV D2.
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Lots of TC boxes on the horizon, the
Sigelei 75W Plus looks quite decent and then there are the big boxes like the
HΩ Wrecker which looks great as well.
Tough choices!