Well here is one speculation:
200W Asolo TC Box Mod by Heaven Gifts | Page 42 | E-Cigarette Forum
I certainly cannot vouch for the veracity. And I doubt the VTC Mini is doing this, because they would be making a big marketing stank about it.
eVic-VT mini?
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200W Asolo TC Box Mod by Heaven Gifts | Page 42 | E-Cigarette Forum
I certainly cannot vouch for the veracity. And I doubt the VTC Mini is doing this, because they would be making a big marketing stank about it.
I think it has something to do with how fast the resistance jumps. If it's too quick, the device assumes the coil is dry and thus scales back the power.
It's easy to see that Yihi boards are doing this because you can't put a dry coil on there, set it to 600F and have it fire at that temp. You will see "dry coil" on the screen with very little warmth.
It's not about the moisture, it's about the change in resistance as the coil heats up. A dry coil will have a different resistance to a moist coil.
Nickel and Titanium are more predictable and easier to measure resistance fluctuations which is why they're used for TC, there are already devices that are managing to the same thing for Kanthal although I doubt they're as accurate - still early days for temp control.
Well, not really. The resistance/temperature on a dry coil will rise much more quickly as there's nothing to cool it down. The dryness or wetness of the coil doesn't really do anything for its resistance.
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Ni and Ti are no more predictable. It's because their resistances vary a lot more (and so are easier to measure the change) that they are used for TC.
In other words, it is the rate of resistance change rather than the resistance change itself that the mod measures to indicate a dry coil (maybe; speculation). Like acceleration vs. speed of a car.
I don't know. I always assumed that these chips only measure resistance change and hit the break when the set temperature is reached. With a dry coil that temperature is reached so quickly, and the breaking so abrupt, that it'll appear as if the set temp isn't reached. But, I haven't bothered to even check what the screens on my devices are doing, and as long as I'm having a good experience I really don't care
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After a day of use I've noticed that the battery life in TC seems really good for a single 18650, I was always disappointed with the battery life on the original VT.
Finish is holding considering the amount of atties that have been put on it, it's been in my pocket with keys too - not a mark.
The speed of res change would also depend on coil size, wire gauge, airflow and wattage.
"Dry coil" is just misleading you can hit the temp limit by zero airflow, too small coil and other reasons, IMO it's like calling Watts Joules I think YiHi just want to be different and don't care how many people they confuse in the process.
And that variability is why the iJoy Asolo needs to "learn" a build by firing it for several seconds with a wet coil before the "dry hit prevention" is enabled. It essentially records a baseline of that particular build, recording peak resistance and rate of change, and then cuts power when peak resistance is exceeded and/or the rate of change is deemed too fast. It doesn't modulate, it just cuts power.
But if you have a crappy build that's already struggling, the Asolo doesn't know that. Garbage in, garbage out.
The "no liquid" messsage on other temp control devices is basically using the same sort of logic, but once again, it's assuming its baseline settings are correct..fail to lock in resistance, or lock in a hot coil, or have a connection fault of some sort, and you may never see that message even as the cotton bursts into flames, because garbage in, garbage out.
I think in general "dry coil" or "no liquid" as warning messages for going over the temperature can be misleading. I see a lot of people struggling as their coils are too small, a few because of not enough air flow and the inevitable not having a good cool reading and this type of message points noobs in the wrong direction to find a solution.
The "Dry Coil" message only happens, in my experience, when the coil is actually dry. The Yihi devices are somehow determining that the coil is dry.
I can turn the temperature all the way down to 400 and max the Joules at 50 and fire it all day long. As long as the coil is wet, I never get a dry coil message. As soon as the coil goes dry, I get the message, no matter what temp or Joule setting I have it on.
So, yes, the dry coil message isn't just a sham. It does actually know when the coil is dry (like I said, probably by the resistance changing too fast).
I am curios, Riptrippers said he can feel a spike in the beginning of the drag i.e a lot of power applied and after it goes down and regulates temperature accurately. Did you notice something like this or is it just him having it set to higher watts in temp mode? What I'm asking is if set to lower watts, 20 let's say, can you feel that it still goes beyond that at the very beginning of a drag? I think that would be annoying for me
It seems to get up to temp almost instantly but when it hits temp it doesn't drop off like it used to do on the VT, it seems to keep on going full tilt even when the protection message appears.
It's almost like temp protect is happening on a microscopic scale - no burnt hits though, so whatever it's doing it's doing it really well.
I have to say I wasn't expecting much of this device, I just wanted a smaller and lighter version of the Evic VT with upgradeable firmware.
I actually really, really like the VTC because it's a solid little performer that feels and looks great.
It's almost like temp protect is happening on a microscopic scale - no burnt hits though, so whatever it's doing it's doing it really well.
I have to say I wasn't expecting much of this device, I just wanted a smaller and lighter version of the Evic VT with upgradeable firmware.
I actually really, really like the VTC because it's a solid little performer that feels and looks great.
So what do the watt settings change? Ramp up time? For example if it's set to 10 watts it'll take longer to reach temp than 30 watts for example?
Couple of things I've discovered - 20 clicks gives you the firmware version and if you press the left and fire button when the unit is off then you'll get the remaining battery voltage.
Yeah, just tried 460F at 10 watts - you'll get there eventually but it takes a while.
Sounds good to me. Also I think I saw in another review that with a number of clicks when off it shows the temp of the mod or board, but could not remember which video it was to see how many clicks again
With the EVIC-VT it was 10 clicks to see the board temp. Not sure if this works on the mini as I don't have one yet.
Yeah, I guess that makes sense, not vary accurate though, seems more like a marketing gimmick than a really useful feature. As the other poster/s said, there can be other things to give you a false alarm.
Thanks. Good to know.
BTW..... Ecig.com has (faster than expected) restocked their VTC mini kits (black only, for the moment). Just ordered mine. Can't beat $44 shipped for the full kit. 
Can't wait to try this bad boy out, along with the Billow V2 I just ordered to go with it.
Can't wait to try this bad boy out, along with the Billow V2 I just ordered to go with it.- Status
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