Sub ohm advice needed before I blow myself up :)

[Darkginger]

So, I've got a Cool Fire 4 on its way, and an Isub G tank, which I think comes with a 0.5 ohm coil - then I went and ordered some 0.2 ohm replacement coils (don't ask me why, they were there, and I clicked). I've looked, and I've read stuff about Ohm's Law, and it's just not going in - what wattage range should I be looking at to produce massive clouds without things going bang? (Yes, I am that stupid!). Many thanks if you can advise! None of the above has arrived yet, so am not in imminent danger  Planning on using 80/20 VG/PG at 6mg, btw.

[jacquif]

I use an Isub G tank on a Coolfire 4 Plus and vape 3mg on a 0.5ohm coil at around 35 watts. Is it a Coolfire 4 or a Coolfire 4 Plus - there's a big difference in power....?

[striker42]

Don't think a coolfire 4 with fire a 0.2 ohm coil. A coolfire 4 plus will fire 0.2 ohm and give you plenty power. So as jacquif has already stated, quite a difference in power and minimum resistance between the two models.

[Postmodern Smoking]

The Coolfire 4 operates between 6 – 40W, with its inbuilt battery
and fires resistances from 0.2 – 3.1 Ohm  (according to Innokin HERE)

So the mod itself should prevent you from "blowing yourself up". The only issue that you might have is that you are operating (with your 0.2 Ohm replacement coils) right at the limit of mods capabilities (or claimed capabilities). I don't know what tolerance that the coils are made to, but if some are slightly less than 0.2 Ohms the mod may not fire.


[ETA] - if it was me I think I'd order some more slightly higher resistance coils, such as 0.5 Ohms.

[jacquif]

I have both and the Coolfire 4 only goes up to 40 watts - I wouldn't be trying it with a 0.2ohm coil....I've used a 0.5ohm coil on mine and it was fine. We really need to know which version of the Coolfire you have to make sure you're gonna be safe.

[striker42]

Jul 24, 2016 14:08:48 GMT Postmodern Smoking said:

The Coolfire 4 operates between 6 – 40W, with its inbuilt battery
and fires resistances from 0.2 – 3.1 Ohm

So the mod itself should prevent you from "blowing yourself up". The only issue that you might have is that you are operating (with your 0.2 Ohm replacement coils) right at the limit of mods capabilities (or claimed capabilities). I don't know what tolerance that the coils are made to, but if some are slightly less than 0.2 Ohms the mod may not fire.


[ETA] - if it was me I think I'd order some more slightly higher resistance coils, such as 0.5 Ohms.

Coolfire 4 is a great mod, I don't have one but I know gill2009 has a couple. Got to agree with Postmodern Smoking on constantly pushing the mod to it's limit. If it is a Coolfire 4 and not the plus, that's fine if you get some 0.4-0.5 ohm coils which will suit your mod's capability better and still give you a great vape.

Edit : a lot of vendors state that the 4 has minimum of 0.3 ohm resistance Postmodern Smoking, so will it fire 0.2? IDK. Maybe someone with experience could tell us. But it still wouldn't be for me, pushing the limit every time I pulled the trigger for a toot.

[Get Off My Cloud]

The 0.2ohm coils for that tank are rated to be used at between 20W and 50W by the manufacturer.
I really doubt you'll get anything more than a tiny wisp of vapour at 20W so expect them to operate more toward the 50W end best.

The good news is you're not going to be blowing yourself up with a regulated mod, if the resistance is too low for your mod it'll just give a low resistance warning and refuse to fire.

[Darkginger]

It's not the plus version, but according to a YouTube review I watched, it should fire the 0.2 coils OK - but I think you're all probably right, will order some higher resistance coils and see how I get on Still feel somewhat clueless about what wattage range to try, could anyone give me a clue, please, assuming I'm using a 0.5 coil? I have tried and tried to understand how ohms, watts and voltage relate to each other, but it's like I'm blind when it comes to comprehending it all - must have read 20+ idiot's guides to it, and am still none the wiser!

[SteveF]

first things first.....



Sorry, you won't blow yourself up.

The Cool-Fire will do the Ohms Law for you unlike sub-ohming with mechanical mods where you have direct un-regulated contact with the battery.

The 0.5 ohm coil will be fine.

The  CF4 only goes down to 0.3ohms with full power so if the resistance is too low the Cool-Fire won't fire the 0.2ohm coils (so you won't blow up) and there is unfortunately a chance if it does fire that it may not be able to fire them at an optimum wattage...so you may not get big clouds.

[Greg]

I wouldn't worry about understanding Ohms law if you're only using regulated mods, just follow the instructions that came with the mod and if you do put anything on it with too low a resistance the electronics will safeguard you and prevent it firing

Go with the 0.5's on the Coolfire

[striker42]

With 0.5 ohm I would start at 20w and increase until I find my sweet spot.

[Get Off My Cloud]

Look on the side of the coils you will see a Wattage range etched on the side of the casing.
Start at the bottom end and work your way up a few Watts at a time until you get to a vape that suits you.

[VapingBad]

Ohm's don't matter like they do with mechs, but these days in general lower ohm heads of the same wire type have larger coils and are built for more power. Wattage is the important adjustment, start low and adjust upward to taste always works.

If you read posts about coils for unregulated devices you had to set the power by using Ohm's Law the find the resistance that would give you your desired power at a fixed voltage. You just don't need to do this with Variable Voltage, Variable Wattage or temp control. Your mod will have upper and lower resistance limits that you need to keep within. Also what is a low res for one coil type is high for another, with DNA 75 or 200 I may build 0.03 ohm dual with Ni200, 0.05 ohm dual with NiFe30, 0.15 ohm dual with Titanium or 0.50 ohm dual with Stainless Steel, they will take a similar amount of power.

[gill2009]

Jul 24, 2016 14:26:23 GMT striker42 said:

Jul 24, 2016 14:08:48 GMT Postmodern Smoking said:

The Coolfire 4 operates between 6 – 40W, with its inbuilt battery
and fires resistances from 0.2 – 3.1 Ohm

So the mod itself should prevent you from "blowing yourself up". The only issue that you might have is that you are operating (with your 0.2 Ohm replacement coils) right at the limit of mods capabilities (or claimed capabilities). I don't know what tolerance that the coils are made to, but if some are slightly less than 0.2 Ohms the mod may not fire.


[ETA] - if it was me I think I'd order some more slightly higher resistance coils, such as 0.5 Ohms.

Coolfire 4 is a great mod, I don't have one but I know gill2009 has a couple. Got to agree with Postmodern Smoking on constantly pushing the mod to it's limit. If it is a Coolfire 4 and not the plus, that's fine if you get some 0.4-0.5 ohm coils which will suit your mod's capability better and still give you a great vape.

Edit : a lot of vendors state that the 4 has minimum of 0.3 ohm resistance Postmodern Smoking , so will it fire 0.2? IDK. Maybe someone with experience could tell us. But it still wouldn't be for me, pushing the limit every time I pulled the trigger for a toot.

  I do have a couple of Coolfire 4's...personally, I've never even tried to sub-ohm on them...however I also have a Coolfire 4 plus ( thank you paulymeatballs ) & it is a dream to sub-ohm on.
  
  I'm sorry I haven't been much help.

[Postmodern Smoking]

Jul 24, 2016 14:26:23 GMT striker42 said:

Jul 24, 2016 14:08:48 GMT Postmodern Smoking said:

The Coolfire 4 operates between 6 – 40W, with its inbuilt battery
and fires resistances from 0.2 – 3.1 Ohm

So the mod itself should prevent you from "blowing yourself up". The only issue that you might have is that you are operating (with your 0.2 Ohm replacement coils) right at the limit of mods capabilities (or claimed capabilities). I don't know what tolerance that the coils are made to, but if some are slightly less than 0.2 Ohms the mod may not fire.


[ETA] - if it was me I think I'd order some more slightly higher resistance coils, such as 0.5 Ohms.

Coolfire 4 is a great mod, I don't have one but I know gill2009 has a couple. Got to agree with Postmodern Smoking on constantly pushing the mod to it's limit. If it is a Coolfire 4 and not the plus, that's fine if you get some 0.4-0.5 ohm coils which will suit your mod's capability better and still give you a great vape.

Edit : a lot of vendors state that the 4 has minimum of 0.3 ohm resistance Postmodern Smoking , so will it fire 0.2? IDK. Maybe someone with experience could tell us. But it still wouldn't be for me, pushing the limit every time I pulled the trigger for a toot.

I was just going off the spec.s that Innokin claims on their site striker42 , www.innokin.com/vaporizers/cool-fire-iv/ It says 0.2 Ohm, but if others are saying 0.3 Ohm maybe Innokin is bending the truth.