Appropriate temperatures on TC

[FishingBuffalo]

The TFV4 is a lot of tank for the D2. Most coils for it like very high wattage.(80+). Noticed the Ni/Ti coils for it too like very warm temps (dual coil? .. My XCube II in dual coil Ni mode 400 D is a cloud chucker on my dripper.

If you want to run cooler than 400 D, a Triton/ Subtank Mini with Ni200 coil good option. Or better yet Kayfun 4. I run 340-370 single coil with great results.

 

[rhelton]

I thought the resistance range on the iPV D2 was 0.2-3.0ohm. Isn't 0.05-0.07ohm dangerously below the safe range?

This sounds strange I know. Its less labor-some on a single cell TC mod to vape closest to the cut off. The D2 can handle a higher ohm load in TC mode but you can drain a battery in under 2 hours easily. I have found that getting in under .10 works the best, and it is absolutely safe to do so.

 

[Cabrill]

Now that I actually have my hands on it I'm surprised at the results. I find that I need the wattage up as high as I can get it to really taste the flavor of my juice, and my iPV D2 won't allow me to go over 50J while in TC mode. Also, I have the temperature set to 450F which is much higher than I anticipated setting it, but below 450F I don't seem to get much vapor at all. The prebuilt TF-TI coil I have in there is reading/locked in at 0.36ohm, does that factor into the maximum wattage being locked down to 50?

 

[SLvapor]

Isn't the tfv4 a quad chamber/coil hence the "4"

Just looked it up. There's a single duel triple and quadruple coil depending on which your using.

 

[Croak]

Don't forget, almost every pre-built temp control coil on the market is a retro-fitted non-TC coil design. The coil legs are loooong in these things. As you know, temp control works by reading the resistance change, but it's an AVERAGE resistance change, the mod can't monitor individual bits of the wire and just assumes the resistance change is uniform. Coil legs don't heat at the same rate as the coil itself, and the longer the legs, the more pronounced this is.

As a consequence, you generally need to run pre-builts at a higher temp than you would run an RTA/RDA (with shorter legs) to reach the same perceived "mouth" vape temperature, all else being the same. And in the case of the TFV4, you've also got a lot of airflow and a fairly long chimney cooling the vape, and a fair amount of coil mass with the dual Ni200 coils causing the IPV D2 struggle to output enough power to get you to the mouth temp you like. And then of course, you've got dual coils further skewing the average resistance if one happens to heat faster than the other (which is always the case with dual coils to a greater or lesser degree).

 

[WiSK]

I thought the resistance range on the iPV D2 was 0.2-3.0ohm. Isn't 0.05-0.07ohm dangerously below the safe range?

Unlike Kanthal, nickel and titanium increase resistance when hot. As soon as you put current through it, the resistance increases two or three-fold. So there is only a short burst of high current. Furthermore, as soon as it reaches the set control temp, the current is reduced further.

Danger with low ohms comes with continuous discharge, e.g. >5 seconds firing with a current over the battery's rated limit. With TC devices you might have a very short burst of 10-50 amps, then within one second it's down to 1-5 amps. That's all that's needed to keep it hot enough to produce vapour.

 

[edyle]

Unlike Kanthal, nickel and titanium increase resistance when hot. As soon as you put current through it, the resistance increases two or three-fold. So there is only a short burst of high current. Furthermore, as soon as it reaches the set control temp, the current is reduced further.

Danger with low ohms comes with continuous discharge, e.g. >5 seconds firing with a current over the battery's rated limit. With TC devices you might have a very short burst of 10-50 amps, then within one second it's down to 1-5 amps. That's all that's needed to keep it hot enough to produce vapour.

Thought that was a bit of an overstatement at first, but looking over the numbers:
http://www.engineeringtoolbox.com/resistivity-conductivity-d_418.html

I think that's a fair statement; the resistance of nickel could increase two or three-fold if you're increasing temperature by a few hundred degrees C.

 

[Roadshaker]

Isn't the tfv4 a quad chamber/coil hence the "4"

Just looked it up. There's a single duel triple and quadruple coil depending on which your using.

There are 11 different coils at the moment and they love high watts! Really need more power than the D2 can give.

Sent from my HTC6535LVW using Tapatalk

 

[lipadj46]

Yes I have the dual Ti coil on my DNA 200 set at 480 degrees with a 100 watt preheat and at 90 watts it barely gets up to temperature. These coils need high watts

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[GeorgeS]

Maybe with the store bought TFV4 coils (I've seen more than one person say the 3x and above coils need +80W to "come alive") however my TFV4 is currently mounted on my TC40 using the single coil RBA and with a single 10wrap 28AWG/ID2.5mm its working fine for me.

While I've never used an RDA before compared to all the other tanks I have (ST, STM, Atlantis2, Lemo2) the amount of airflow a TFV4 has is rather crazy - almost like there is no restriction at all.

 

[cjpeltz]

i haven't use ti yet. but for all of my ni coils which are all pre-built - i am running between 520 and 540.