Questions from a RBA newbie

[yeehc]

I have tried couples of build on the Igo W, now I am settle on a dual micro coil 1.5 ohm with cotton wick, however I am not very satisfied with the vapour production.
I notice the coil with 28ga heat up very slow when its not a micro coil (more space between wire), in what scenario should the coil be build that way?
I had a K100 mod and planning to get some Efest/AW IMR battery to try sub ohm, what else should I look after?
mods like the GI2 can push up to 90Watts, I know these are for sub ohms, but why does sub ohm need that much power? I though lower resistance require less power? Can someone explain these to me? Any input would be appreciated.

 

[drummerskey]

I am not an expert but I bought the Igo-W and was really unhappy with the build. A few things that was suggested that worked really well was..............making two micro coils at about 3ohms each, making your resistance 1.5. Drilling the air holes out with a 1/16 bit and then placing your coils directly in front of the air holes when you put the cap on. Don't use too much cotton.

I saw a build that had the entire deck covered in cotton and found that if you make a nest with the cotton on the outside, it wicks better.

I used 32g and a 1.8mm diameter and made sure that the coils were lighting up at the same time before putting the wick in. Once I did this, it was amazing..........lots of TH and vapor!!

EDIT: I vape this at about 11 watts

 

[Vaslovik]

Not to nitpick, but you are talking about an RDA, not an RBA. As for the IGO-W, (an RDA, Rebuildable Dripping Atomizer) I have one, and it's been sitting in my cigar box for months now where I deposited it in favor of my RSST which is an RBA. I did the whole dual microcoils and cotton thing, and at the end of the day it just didn't come anywhere near up to my RSST built straight genny with SS mesh and kanthal.

Different strokes fer different folks I guess, I know drippers have a huge following and plenty of folks love them, they are just not for me.

 

[yeehc]

I have the exact same build expect I was vaping at 9 Watts...much better at 11 Watts! Is it correct that dual coil require more power than the singles?

 

[Dalton J.H.]

Lower ohms means Less voltage is needed to function. but as the battery voltage lowers less power is used. ( function in this case is create vapor)
this is using Ohms Law,
for example my Mech mod Is also A K101 running a Sony 30 amp with a Patriot clone RDA.
My Coil is .8 ohms and my current voltage is 4 volts. according to ohms law, that would mean i am running 5 amps at 20 watts
as my voltage drops to say, 3.5 on my .8 ohm coil, ohms law tells me, im now running 4.37 amps at 15 watts.

Part 2
if i had say .5 ohms running at full charge around 4 volts. then ohms law tells me im running 8 amps at 32 watts

instead of the original .8 ohms 4 volts running 5 amps at 20 watts

hope this helped.
google it and just about everything you can find will help you understand.

 

[drummerskey]

it usually means that dual coils require more wattage but the sweet spot for you can vary. To really simplify it, since you have two coils at 3 ohms, the battery has to power both coils and even though the resistance says 1.5.........it can be under-powered.

I have a cherry mix juice that I used on the same set up and I had to drop it down to 7 watts just so that I could vape it. The hit was way too strong.

I also found with my IGO that I cannot do much more than 6mg of nic or I will fall on my .....

 

[Dalton J.H.]

Deleted to avoid confusion.

 

[Dalton J.H.]

well my bad, i must have been typing when Drummerskey posted the post above mine
My appologies

 

[edyle]

I have tried couples of build on the Igo W, now I am settle on a dual micro coil 1.5 ohm with cotton wick, however I am not very satisfied with the vapour production.
I notice the coil with 28ga heat up very slow when its not a micro coil (more space between wire), in what scenario should the coil be build that way?
I had a K100 mod and planning to get some Efest/AW IMR battery to try sub ohm, what else should I look after?
Mods like the GI2 can push up to 90Watts, I know these are for sub ohms, but why does sub ohm need that much power? I though lower resistance require less power? Can someone explain these to me? Any input would be appreciated.

1:
Compact coils are better ('micro' coil).

2:
The Sony vtc's seem to have the highest reputation.

3:
It is not that sub ohm needs more power, it is that the reason people go sub ohm is to get more power cheaply.
It is like you can go from here to there more cheaply on a motorbike than a car.

 

[happydave]

I have the exact same build expect I was vaping at 9 Watts...much better at 11 Watts! Is it correct that dual coil require more power than the singles?

depends on the resistance of the coils....
but lets say you have a single coil that is 3.0 ohms and a battery at 4.2 volts so that comes out to 5.88 watts of power, drawing 1.4 amps from the battery

now your duel coil is the same 3 ohms but you have 2 of them hooked up in a "parallel circuit" over all circuit resistance is now 1.5 ohms. because adding parallel branches reduces over all circuit resistance. since we use 2 coils with the same resistance for each branch it makes the math really easy. just take the resistance of one of the coils and divide by 2 to get the over all circuit resistance.
so this 1.5 ohm parallel circuit is going to pull twice as many amps (2.8 amps) from the battery as the 3 ohm single coil. then the amps are then divided up among the branches, in this case 2 branches. so the amps at each of the duel coils is the same as the single coil (1.4 amps). the voltage is also the same 4.2 volts. so each duel coil is still getting 5.88 watts of power.

does this answer your question?

 

[drummerskey]

Correct me if I am wrong, as stated; I am not an expert but although you can get more power from sub-ohming in wattage........doesn't it come at the expense of battery life?

If I understood it correctly, I thought that an analogy that is closer would be using race fuel. You get more horsepower out of your car but you use it quicker??

 

[happydave]

Correct me if I am wrong, as stated; I am not an expert but although you can get more power from sub-ohming in wattage........doesn't it come at the expense of battery life?

If I understood it correctly, I thought that an analogy that is closer would be using race fuel. You get more horsepower out of your car but you use it quicker??

if you have a 3 ohm single coil OR two 3 ohm duel coils the wattage at each of the coils is going to be the same as long as the voltage is the same for each rig.. and this is because adding a parallel branch will reduce over all circuit resistance. as resistance decreases amperage will increase.
lets pretend for a second that we have a garden hose.
this hose represents the wire. and the water flowing in the hose is the flow of electrons.
Volts is like the water pressure
Amps is the speed the water is traveling at
and Resistance (ohms) is the back pressure caused by friction
the watt is a unit of power, Volts x Amps = Watts.

so with a duel coil rig that is made up of two 3 ohm coils over all circuit resistance is 1.5 ohms. this will draw twice as much amperage from the battery as a 3 ohm single coil rig. then the amps are divided by the branches. a duel coil rig has 2 branches. the voltage remains the same at each branch.

"doesn't it come at the expense of battery life?" this would depend on what the over all circuit resistance is. if you had a duel coil rig with two 6 ohms coils it would deplete the battery exactly as fast as a single 3 ohm coil rig.

 

[edyle]

Correct me if I am wrong, as stated; I am not an expert but although you can get more power from sub-ohming in wattage........doesn't it come at the expense of battery life?

If I understood it correctly, I thought that an analogy that is closer would be using race fuel. You get more horsepower out of your car but you use it quicker??

Yes, regardless of how you get more power form the battery, whether you use a kick or you sub ohm, you will drain the battery faster.

 

[happydave]

Yes, regardless of how you get more power form the battery, whether you use a kick or you sub ohm, you will drain the battery faster.

yep that makes sense.

 

[drummerskey]

I apologize, I feel as though I am confusing the issue and was just trying to seek clarification for the OP. The word "power" could be incorrectly assumed by a new person and amps/wattage/voltage could be all be misinterpreted.

I will leave it to the more advanced with sub-ohming, drippers and mech mods

 

[yeehc]

Sorry for misusing the term "power", I was referring to Watts. So dual coil required same among of Watts, but more amps, therefore the batteries is drain faster. Thx for all the replies guys, it was really helpful!

 

[edyle]

Sorry for misusing the term "power", I was referring to Watts. So dual coil required same among of Watts, but more amps, therefore the batteries is drain faster. Thx for all the replies guys, it was really helpful!

The watt is the metric unit of power.
So using watts or wattage when referring to power, is correct.

Dual coil and wattage:
For the same applied voltage, a dual coil of the same total resistance of a single coil, will burn the same wattage.
wattage = volts x volts / ohms.

However, the dual coil of the same resistance of a single coil, consists of 2 coils, each of double the resistance of the single coil, and therefore needs more voltage to end up at the same temperature. Therefore the dual coils generally are run at higher wattage than the equivalent single coil.

Example:

1:
Single coil at 4 ohms, on a 4 volt battery:
Wattage = 4 x 4 / 4 = 4 watts.

2:
Dual coil composed to two 4 ohm coils (total resistance = 2 ohms) on a 4 ohm battery:
Wattage = 4 x 4 / 2 = 8 watts.

In (1) you are vaping a 4 ohm coil on a 4 volt battery and burning 4 watts
In (2) you are vaping 2 4 ohm coils each on 4 volts and burning 4 watts each, therefore twice as much fog.