OMG this is frustrating. !m using 30 gauge kanthal on my new igo-w i just got today and i cant get anything right. I cant get my ohms to get above 2ohms even with like 7 wraps and everytime i add a second coil my innokin v3 reads .6ohms and wont fire. I can get one coil running at around 1.8 but once i add another coil even if its just likethe other one my innokin reads .6 everytime and wont fire. ARGHHHH HELP
First build on IGO-W RDA is driving me NUTS!
- Thread starter Synisity
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You need a quick lesson in Ohms Law...
1 coil at 1.8 ohms = 1.8 ohms, 2 coils each at 1.8 ohms in parallel = .9 ohms total
heres the math:
1/( (1/C1) + (1/C2) ) in other words if you have 2 coils in parallel and they are equal values then the total resistance is 1/2 the value of one of the coils.
If one coil is at 1.8 ohms and the other is at 1.1 then the total ohms will be 1/(1/1.8) + (1/1.1) = .683 ohms
and if you have a VV/VW unit, the protective circuitry wont let it fire if the ohms are less than 1.2 ohms, if you want to fire off sub ohm coils you need to go to a mech but FIRST you need to understand coils and batteries first...
1 coil at 1.8 ohms = 1.8 ohms, 2 coils each at 1.8 ohms in parallel = .9 ohms total
heres the math:
1/( (1/C1) + (1/C2) ) in other words if you have 2 coils in parallel and they are equal values then the total resistance is 1/2 the value of one of the coils.
If one coil is at 1.8 ohms and the other is at 1.1 then the total ohms will be 1/(1/1.8) + (1/1.1) = .683 ohms
and if you have a VV/VW unit, the protective circuitry wont let it fire if the ohms are less than 1.2 ohms, if you want to fire off sub ohm coils you need to go to a mech but FIRST you need to understand coils and batteries first...
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well (MODERATED) you think that would of been mentioned in one of the hundred utube videos i watched lol thanks
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on my Igo-W i use 6 wraps on each side dual coil and i get about 1.4 Ohms. fires awesome.
Synisity, you're literally playing with fire. Don't get mad. 
BunnyKiller is absolutely right that Ohm's Law is really really important when you're doing this.
I know the videos make it look easy, but you NEED to have at least a very basic understanding like that. As much as it sucks, there's some math involved. I did my first dual-microcoil build last night on the exact same dripper with 28g wire. I had to use about 12 wraps per coil to get them to about 3 ohms each and my final resistance was 1.4. The funny thing is I had almost 2 years of electronics engineering about 20 years ago but then switched majors and went into a completely different field so I don't remember too much; but enough came back that I was able to figure it out.
So you should know this:
A dual-coil build is basically a parallel circuit. Just do a quick Google search on parallel circuits and how resistance works in each branch and affects the whole circuit.
The longer your wire is (e.g. the more times it's wrapped around something) the more resistance it will have. So more wraps if you need to increase the resistance.
If you have two coils that are exactly equal in resistance, the resistance for the entire circuit will be about half of the two resistances added together.
You NEED to know this stuff if you're going to build. Thankfully there's not too much more to it other than knowing what voltage to apply when you vape it. Good luck with your build and I hope some of this has helped.
BunnyKiller is absolutely right that Ohm's Law is really really important when you're doing this. I know the videos make it look easy, but you NEED to have at least a very basic understanding like that. As much as it sucks, there's some math involved. I did my first dual-microcoil build last night on the exact same dripper with 28g wire. I had to use about 12 wraps per coil to get them to about 3 ohms each and my final resistance was 1.4. The funny thing is I had almost 2 years of electronics engineering about 20 years ago but then switched majors and went into a completely different field so I don't remember too much; but enough came back that I was able to figure it out.
So you should know this:
A dual-coil build is basically a parallel circuit. Just do a quick Google search on parallel circuits and how resistance works in each branch and affects the whole circuit.
The longer your wire is (e.g. the more times it's wrapped around something) the more resistance it will have. So more wraps if you need to increase the resistance.
If you have two coils that are exactly equal in resistance, the resistance for the entire circuit will be about half of the two resistances added together.
You NEED to know this stuff if you're going to build. Thankfully there's not too much more to it other than knowing what voltage to apply when you vape it. Good luck with your build and I hope some of this has helped.
Like everyone else said learn your ohm laws im not the smartest in the land by no means but you will pick it up but yeah it can end in fire as ive found out in the past
i must be using the wrong size wire cause i just did 9wraps on each side and only getting .7 ohms :/
What are you wrapping it on? If you need to increase the resistance, try a coil that's a little bigger in diameter. You gotta get the wick in there anyway
The number or wraps is not a good indicator. Number of wraps means nothing unless you indicate what you are wrapping it around. If you wrap 1 wrap around a pencil you'll get a much different ohm reading than if you do one wrap around a tooth pick. Number of wraps determines overall length of the wire, but you must indicate the diameter of your coil..
i m just wrapping my 30 gauge wire around the 2.5mm silica that i double up by folding in half
Okay, yeah, no wonder you're having trouble. Your coils are probably not going to be very identical that way. Try wrapping it around something else like a jeweler's screwdriver or other thin round thing like that. It will be MUCH easier and the coils will be more consistent. A drill bit will work too (not sure what size but maybe someone can recommend it). Get the coils done, then wick them.
Here is a little guide for you: http://www.e-cigarette-forum.com/forum/reos-mods/446263-micro-coils-ohms-description.html
One more thing. I was TOTALLY in your place last night, trying to work in dim light and having an issue that was user error but took forever to figure out. It was really frustrating but this is what I wound up with. You will be really stoked when you get it right.
Sorry guess I should have mentioned. These were 14 wrap with 30g kanthal on a 1/16 drillbit. Came in at 1.3ohms
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I think mine were 5/4 wraps with 32g kanthal. 2.8 ohms each but came in at 1.4 total. Pretty large wraps though around like a 1/8" I think. Didn't want to get to crazy into the micro coils on my first build. Vapes like a champ on my igo-w though.
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That sounds about right. 30g on 1/16 bit = ~ .2 Ohms per wrap
So, for your coil, 14wraps x .2 per wrap = ~ 2.8Ohms. For dual coil, ~2.8Ohms / 2 = ~ 1.4Ohms.
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