After upgrading the firmware, temp control is not working as it was before. I have to turn it all the way up to 315c to get a semi-decent vape. Before the upgrade I was at 225c
I'm using dual SS staggered fused claptons (26ga+32ga)*2 + 32ga. Should I change the TCR and if so what do people suggest?
A complex build like that is going to have its own special coefficient, and you'll probably have to trial-and-error it yourself to find out what it is.
It's not a quick and dirty process.
In one of the temp control modes and with a saturated wick, navigate to the TCR option with a cool coil. Make sure your mod is starting with the correct room temp resistance.
This is critical. Get starting resistance wrong and temp control will not work.
Turn the TCR down to something reasonably below the recommended TCR for that metal type (SS316L, 304, 430, 317, etc). A few points is good. You may have to look up the right value somewhere.
Exit out and try it. If it's too tepid, repeat the above, turn TCR up a bit and try it again. Repeat until you get a warning hit. Back off to the previous setting or split the difference, maybe.
With the vandy chip, the default SS TCR is '1100.' This I interpret to be 110.0. So for trouble-shooting a single wire spaced SS316 coil, you'd start somewhere below 0920 and work up.
If you use contact SS coils rather than spaced, your build's TCR and the published TCR for that material may not be the same. TC works best with spaced coils forever and ever, Amen.
If you use dual coils rather than single, your TCR and the published TCR may not be the same unless you have identical resistances for both coils. Even a few hundredths of an Ohm can make a difference.
If you get a dry hit then either the coefficient is wrong, starting resistance is wrong, or both. Or, you're trying temp control on a Smok or an Ijoy.