question about builds

[mrdfield]

So I decided to try a 1,6 ohm coil on kayfun v4 clone Tobecco and I am using 28gauge Kanthal with a cotton
wick on a Rdna 30 and its vaping well at 15 watts I have a kanger subtank mini coming in the mail and here goes my question
So the kanger subtank states that with a .5 ohm coil i could vape up to 30 watts but the voltage comes in at like 3.8 volts
I was under the impression that the rdna 30 needs at least 4 volts to work which kinda brings me to my second question
What is the point of of sub ohms? cant i just build a 2.0 ohm coil or something like that to achieve the results as if i was subohming
I am very confused on this
thanks for the replys in advance
Oh yea is a 1.6 ohm coil at 15 watts a normal build or any recommendations for the kayfun v4 for watts and ohms thanks again

 

[MattyTny]

Your rDNA30 can fire 30 watts or 8.3 volts, which ever it hits first. Which number it hits first depends on the amperage limit of 10 amps and your resistance. It can also read a resistance range of 0.5-3.0 ohms.

When you work with these numbers you'll find that at the low limit, 0.5 ohms, you can get all 30 while using about 3.8 volts and 7.7 amps. This is because when you decrease your resistance you can push more amps through your coil to get the same 30 watts with less voltage. You tax your battery more because now you're using most of its available amperage. You don't really want to build at this end.

Now if you want to build the highest resistance to get all 30 you'll find that you can only go up to 2.3 ohms, not the full range to 3 ohms. At 2.3 ohms you're using all 8.3 volts and about 3.6 amps. This is because when you increase your resistance you can use more voltage to push less amps to get the same wattage. But now you're at the other extreme end and sacrifice performance because you're just barely getting all 30.

Sub ohm vaping is more reserved for mechanical devices where you have a fixed voltage and can only adjust the resistance to get more wattage. Some regulated devices work well with sub ohming too.

go to steam engine and select the DNA 30, you'll see what I'm talking about (under mod range)
Mod range | Steam Engine | free vaping calculators

I also just made a blog recently relating to similar questions
http://www.e-cigarette-forum.com/fo...ohms-law-how-applies-personal-vaporizers.html

 

[edyle]

So I decided to try a 1,6 ohm coil on kayfun v4 clone Tobecco and I am using 28gauge Kanthal with a cotton
wick on a Rdna 30 and its vaping well at 15 watts I have a kanger subtank mini coming in the mail and here goes my question
So the kanger subtank states that with a .5 ohm coil i could vape up to 30 watts but the voltage comes in at like 3.8 volts
I was under the impression that the rdna 30 needs at least 4 volts to work which kinda brings me to my second question
What is the point of of sub ohms? cant i just build a 2.0 ohm coil or something like that to achieve the results as if i was subohming
I am very confused on this
thanks for the replys in advance
Oh yea is a 1.6 ohm coil at 15 watts a normal build or any recommendations for the kayfun v4 for watts and ohms thanks again

1: your rdna probably works with an input between 3.3 and 4.2 volts.
The 3.8 volts you mention is on the output side.
It's two different things.

2: the point of subohms is
(a) for those people who do not have an rdna, but instead are just using a battery in a tube and can't boost the voltage; since they can't boost the voltage, you use lower ohms to get more power
(b) when you put a second coil in parallel to the first coil taking the same voltage, it's like vaping 2 coils at once to produce more vapour; that doubles power, and halves ohms. The more coils you add in parallel, the lower the ohms goes.

 

[Thrasher]

What is the point of of sub ohms? cant i just build a 2.0 ohm coil or something like that to achieve the results as if i was subohming

Your actually on the answer more then you think. With 50+ watt mods now there isnt one.


Sub ohm originated with mechanicals when we had no regulation to drive big coils. Now its not needed but its the " thing"

 

[mrdfield]

So to vape a 50 watt mod at 50 watts what ohm coil would you need and thanks for the reply I am trying to get a handle on all this


Sent from my iPhone using Tapatalk

 

[Thrasher]

Depends on the voltage limit of the mod

Go play with the steam engine website, i dont have a link

 

[edyle]

So to vape a 50 watt mod at 50 watts what ohm coil would you need and thanks for the reply I am trying to get a handle on all this


Sent from my iPhone using Tapatalk

a 1 ohm 28 gauge dual coil
a 0.5 ohm 26 gauge dual coil
a 1 ohm 24 gauge single coil
Coil wrapping | Steam Engine | free vaping calculators

Kanthal A1
gauge ----- watt per ohm (per coil) for 200mW/mm2
34 ----- 1.4
32 ----- 3
30 ----- 6
28 ----- 10
26 ----- 23
24 ----- 45
22 ----- 91
20 ----- 182

Coil wrapping | Steam Engine | free vaping calculators

Current might be a more intuitive way of thinking about it.

gauge ----- current (Amps) for 200mW/mm2
34 ----- 1.2
32 ----- 1.7
30 ----- 2.4
28 ----- 3
26 ----- 5
24 ----- 7
22 ----- 10
20 ----- 13