Watts Vs ohms Vs new coils (what the heck is going on?????)

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eemiely

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Oct 29, 2016
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So I have been vaping with my uwell crown tank and Sigelei 50W box mod and the digital reader was reading .2ohms -.3ohms depending on the wattage and I was keeping the wattage pretty low cuz anything 30w and above was making my throat hurt. Today I decided to change the coil inside my crown tank and when I opened it I realized it definately needed a change cuz it was black on the top but the sides were still white (????).
now heres where it gets weird....
after I changed the coil and put some more e-juice inside the digital reader on my sigelei was reading .5ohms-.6ohms no matter what wattage and im not able to get clouds as well i did before i changed to a new coil thing...

SO what the heck is going on here. I dont understand wattage and how it works with the ohms and why did changing the coil change the ohms so much...HELP!
 
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LouisLeBeau

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So I have been vaping with my uwell crown tank and Sigelei 50W box mod and the digital reader was reading .2ohms -.3ohms depending on the wattage and I was keeping the wattage pretty low cuz anything 30w and above was making my throat hurt. Today I decided to change the coil inside my crown tank and when I opened it I realized it definately needed a change cuz it was black on the top but the sides were still white (????).
now heres where it gets weird....
after I changed the coil and put some more e-juice inside the digital reader on my sigelei was reading .5ohms-.6ohms no matter what wattage and im not able to get clouds as well i did before i changed to a new coil thing...

SO what the heck is going on here. I dont understand wattage and how it works with the ohms and why did changing the coil change the ohms so much...HELP!

Hi again, @eemiely
You were clearly using the OEM .25Ω coil the first time. Ohms WILL rise slightly as the coil heats. But it doesn't mean a lot unless you are using temp control. If your coil is now .5, that is because the 2 spare coils that come with the crown are a .5Ω, and a .15Ω Ni coil for temp control.

Looking at the cotton from the top, it gets dark pretty quick. Swab out the chimney with a q-tip, you'll see the same thing. The cotton showing through the feeder holes will never really turn dark. If you have everclear or strong vodka, you can soak them and Q-tip the coils, getting a couple more weeks from them.

Since your coil is different ohms, you need different watts to get the same heat. Did I point you to the Steam Engine calculator? You can see the effect that higher ohms has on how many watts are needed to push it.
 
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djsvapour

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No panic. I expect the other two replies have identified the issue; you probably put in a new 0.5ohm coil.
The resistance should not be changing (other than a small fraction) and if you were enjoying the 0.25 coil up to 30w then the 0.5ohm coil should also work for you, you just need to play around with the settings.

*Just watch out should you change to the temperature control coil (0.15ohm)... I'm not sure you can use that coil with your Sigelei 50w box mod.*
 

Bunnykiller

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hmmm lets describe it this way

you have a 25W lite bulb ( high ohm bulb) and you put it into a socket that is controlled by a lite dimmer type switch...
you turn on the switch and it barely lites up, so you turn up the switch to a higher setting... it gets brighter but not really bright.
You pull out the 25W bulb and replace it with a 100W bulb ( low ohm bulb). You turn the switch back on and it lites up brighter than the 25W bulb... turn up the switch to full power and it gets really bright and very hot, so hot it will burn stuff... :)
 

mindriot

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It seems the likely cause of the issue has been resolved and as pointed out already the resistance (ohms) should remain fairly static regardless of wattage settings. One thing you may see (and may be why you seen changes before) is often the resistance will increase a little over the time the coil is breaking in. As a general rule the higher the resistance value, the lower wattage setting you want, it is best to start a little low and work up to find the vape you want. For me personally when the coil doesn't have a suggested wattage setting for a 0.5 I would normally start from low 20s and expect to settle somewhere around 30-35, your experience will probably differ but it is generally a good approach for a coil you have not tried.

Pretty much none of the above holds true if you are working with Temperature Control, that is an entirely different story.
 

dcfluegel

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So I have been vaping with my uwell crown tank and Sigelei 50W box mod and the digital reader was reading .2ohms -.3ohms depending on the wattage and I was keeping the wattage pretty low cuz anything 30w and above was making my throat hurt. Today I decided to change the coil inside my crown tank and when I opened it I realized it definately needed a change cuz it was black on the top but the sides were still white (????).
now heres where it gets weird....
after I changed the coil and put some more e-juice inside the digital reader on my sigelei was reading .5ohms-.6ohms no matter what wattage and im not able to get clouds as well i did before i changed to a new coil thing...

SO what the heck is going on here. I dont understand wattage and how it works with the ohms and why did changing the coil change the ohms so much...HELP!
i think previous posters have hit the high points pretty solidly :) keep in mind :

ohms (resistance) are all about the actual coil and should be a fairly static number - coil resistance may vary a little in use (depending on wire type (ss resistance - like your .25 and .5 ohm crown coils - will rise some as the wire gets hot but not so much that it should skew your vape) and the chipset reading resistance) but in general, your ohm rating should be 'fixed' for a given coil - but each coil is rated specifically by its ohm (resistance) number

watts are an adjustable rating that indicate how much power your are throwing at that coil - voltage is tied to the watts rating by means of the ohm's law equation (as you increase watts, voltage increases as well in a ratio governed by the resistance (ohm rating) of the coil - 30 watts on a .25 ohm coil produces 2.74 volts... 30 watts on a .5 ohm coil produces 3.87 volts) - by adjusting your wattage, you should be able to find your 'sweet spot' with a particular coil (that 'sweet spot' is going to depend not just on power, though, but also on thickness of juice, how well coil is wicking, airflow and most importantly, what works for YOU)

hope this helps a little without being overwhelming
 

NealBJr

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Like what everyone said earlier, these are all great responses. I will repeat what they said with one more suggestion.

I liked the lightbulb/dimmer explanation. Your Uwell crown came with two coils... a .25 ohm and a .5 ohm coil. the .25 ohm coil is the heavy hitter of the two. It produces more vapor and heat than the replacement .5 ohm coil. However, the heavy hitter coil needs more power to work. So the wattage on the .25 ohm coil will have to be higher than the .5 ohm coil.

Looking at the technical specifications of the coils:
.25 - 60-120 watts
.5 - 30-80 watts
.15 -DO NOT USE IN WATTAGE MODE

If you look at the side of the coils, it should state which one is which. let's say you set your mod to 60 watts... the .25 ohm coil is power hungry, so it won't get very hot. However, the .5 ohm coil will get pretty hot... the .5 ohm coil would actually produce more vapor at that wattage. However, let's say you bump up the wattage to 100. The .25 ohm coil would burn hot, and produce more vapor than the .5 ohm coil ever could.. but the .5 ohm coil would burn too hot, and end up burning your cotton.. you'd probably have to throw away your .5 ohm coil, since it would burn the cotton causing a bad taste.

So, some simple suggestions for tanks.. first, NEVER put power to the coils without them being soaked with juice. When you first put a coil in, make sure you pre-soak the coil (otherwise known as priming). While using the tank.. try not to let the coils get dry. sometimes towards the end of the tank, you'll want to vape every last ounce of juice before refilling it.. don't do that... keep the tank at least filled 1/4th of the way. Also, if you taste that your coil is getting a bit dry with just a hint of burning... stop. either wait for your coils to get re-wet, or figure out why you're getting dry hits. Continuing on that coil will cause you to ruin the coil.

Another suggestion, is to start at a low wattage and work up. I suggest starting lower than what the manufacturer says for wattage, and work up from there. Resistances on ALL coils will vary slightly depending on how hot the coils are. Usually it doesn't change very much on the Resistance wires (ones that use watts as the main setting). But the "non resistance wires" will change their resistance as the wire gets hotter by a great deal. those require a more advanced suggestions, so I'd stay away from those unless you want to discover Temp control. (I still prefer the wattage mode).

Hope that helps some.. the others have replied nicely.. .I just like to elaborate. :)
 

eemiely

Full Member
Oct 29, 2016
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Oceanside, CA
Like what everyone said earlier, these are all great responses. I will repeat what they said with one more suggestion.

I liked the lightbulb/dimmer explanation. Your Uwell crown came with two coils... a .25 ohm and a .5 ohm coil. the .25 ohm coil is the heavy hitter of the two. It produces more vapor and heat than the replacement .5 ohm coil. However, the heavy hitter coil needs more power to work. So the wattage on the .25 ohm coil will have to be higher than the .5 ohm coil.

Looking at the technical specifications of the coils:
.25 - 60-120 watts
.5 - 30-80 watts
.15 -DO NOT USE IN WATTAGE MODE

If you look at the side of the coils, it should state which one is which. let's say you set your mod to 60 watts... the .25 ohm coil is power hungry, so it won't get very hot. However, the .5 ohm coil will get pretty hot... the .5 ohm coil would actually produce more vapor at that wattage. However, let's say you bump up the wattage to 100. The .25 ohm coil would burn hot, and produce more vapor than the .5 ohm coil ever could.. but the .5 ohm coil would burn too hot, and end up burning your cotton.. you'd probably have to throw away your .5 ohm coil, since it would burn the cotton causing a bad taste.

So, some simple suggestions for tanks.. first, NEVER put power to the coils without them being soaked with juice. When you first put a coil in, make sure you pre-soak the coil (otherwise known as priming). While using the tank.. try not to let the coils get dry. sometimes towards the end of the tank, you'll want to vape every last ounce of juice before refilling it.. don't do that... keep the tank at least filled 1/4th of the way. Also, if you taste that your coil is getting a bit dry with just a hint of burning... stop. either wait for your coils to get re-wet, or figure out why you're getting dry hits. Continuing on that coil will cause you to ruin the coil.

Another suggestion, is to start at a low wattage and work up. I suggest starting lower than what the manufacturer says for wattage, and work up from there. Resistances on ALL coils will vary slightly depending on how hot the coils are. Usually it doesn't change very much on the Resistance wires (ones that use watts as the main setting). But the "non resistance wires" will change their resistance as the wire gets hotter by a great deal. those require a more advanced suggestions, so I'd stay away from those unless you want to discover Temp control. (I still prefer the wattage mode).

Hope that helps some.. the others have replied nicely.. .I just like to elaborate. :)

thank you for your help...but i still have A LOT of questions. heres just a few for now...

first...why does my boyfriend cough when he hits my sigelei at a wattage higher then 10watts?
second...can you explain resistance to me? I understand to get big clouds you want low resistance, i understand ohms is the measure of resistance, I started using the Mod range calculator on steam engine and for my sigelei 50 watt it says this....
Screen Shot 2016-10-30 at 2.34.45 PM.png
but i dont understand whats it telling me....can you explain it to me pretty please?????
your elaboration would be MUCH appreciated.:?:
 
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Grego25

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Something I was told early on was to fire your mod & see what the voltage says. Right around 4 is a good place to start-after the coil has broken in. I don't know about the model you have but my sigelei shows volts without firing it. You can go up & down from there to find the best mix of clouds vs flavor. Another method is to start low & go up until you start losing flavor. Everyone has their own preferences but fwiw I prefer the.5 coil over the.25 in my crown. I use it in tc but in wattage mode my sweet spot is 35-40.


Sent from my iPhone using Tapatalk
 

daviedog

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Sep 2, 2013
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thank you for your help...but i still have A LOT of questions. heres just a few for now...

first...why does my boyfriend cough when he hits my sigelei at a wattage higher then 10watts?
second...can you explain resistance to me? I understand to get big clouds you want low resistance, i understand ohms is the measure of resistance, I started using the Mod range calculator on steam engine and for my sigelei 50 watt it says this....View attachment 610703 but i dont understand whats it telling me....can you explain it to me pretty please?????
your elaboration would be MUCH appreciated.:?:
Median means 50% above,,50% below.
I wouldn't advise vaping at 50Watts.
Try around 20W & find your own 'sweet spot'..
 

dcfluegel

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thank you for your help...but i still have A LOT of questions. heres just a few for now...

first...why does my boyfriend cough when he hits my sigelei at a wattage higher then 10watts?
second...can you explain resistance to me? I understand to get big clouds you want low resistance, i understand ohms is the measure of resistance, I started using the Mod range calculator on steam engine and for my sigelei 50 watt it says this....View attachment 610703 but i dont understand whats it telling me....can you explain it to me pretty please?????
your elaboration would be MUCH appreciated.:?:
first - is your boyfriend a smoker or already vaping? hitting a vape is a little different than taking a drag off a stinkstick - could have to do with the PG level in juice (higher PG = more 'throat hit') or the flavor

second - resistance in a coil has to do with how much power it takes to heat it up - higher resistance requires less power, in general, lower resistance requires more power, in general - and there are a number of factors involved in 'getting big clouds' - resistance, airflow, surface area of coil, wicking, juice (PG/VG content - as stated, PG = more throat hit, VG = more vapor (smoother)... PG tends to be your 'flavor carrier' too, though - personally, i prefer a 30%PG/ 70%VG juice)... keep in mind the numbers that steam engine is giving you are based on an algorithm and you still want to find what works best for you - using the .5ohm coils for the crown with that mod are likely going to be more in your 'zone' if you will... my suggestion would be to pick up a 4 pack of the .5 ohm crown coils and run 'em around 25-35 watts (and make sure you prime the coil by saturating the cotton well with juice prior to firing it) to find what works for you - start on lower end of wattage range with new coil (20-22 watts for that coil?) then hit it a couple times - bump the wattage up 3-4 then rinse and repeat
 

NealBJr

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thank you for your help...but i still have A LOT of questions. heres just a few for now...

first...why does my boyfriend cough when he hits my sigelei at a wattage higher then 10watts?
second...can you explain resistance to me? I understand to get big clouds you want low resistance, i understand ohms is the measure of resistance, I started using the Mod range calculator on steam engine and for my sigelei 50 watt it says this....View attachment 610703 but i dont understand whats it telling me....can you explain it to me pretty please?????
your elaboration would be MUCH appreciated.:?:

There could be several reasons your boyfriend coughs when he tries your vape gear.

Whether or not he's a smoker, he's not used to inhaling vapor. Vapor is denser than regular smoke, so he is simply not used to inhaling vapor. Even when I was a smoker, I would cough, and I've noticed that non smokers who try vaping also cough. I had to work my way up the vaping ladder. I started with the smaller Ecigarettes, and worked up to full fledged vaporizers. As I got used to inhaling vapor, I could up the watts, lower the ohms, and be able to inhale more and more. Not everyone goes to the full fledged "subohming", and it's not necessary to subohm to enjoy vaping. If he wants to vape, start him with a starter system, one that has a high resistance then work up from there if he wants to go higher. Subohming has it's own perks as far as flavor, and heat that adds certain qualities to vaping that not everyone really wants or needs.

Another possibility of him coughing, could be the amount of nicotine he is getting. If he is a non smoker, he is not used to getting ANY nicotine. The "throat hit" is what many smokers look for, but it can make a non smoker cough. Nicotine is one of the main factors of that "throat hit" feeling, vapor quantity and Propylene Glycol is another. Personally, I would just recommend lowering the wattage down to 10 like you are doing now.... he won't get the clouds...but he's not used to getting clouds. :) If he never smoked, or is considered a non smoker, see if you can get some non-nicotine e-liquid.

As far as what ohms is.. ohms is simply the resistance the wire gives. As a general guideline, the bigger the wire, the more energy can go through the wire. Since the wire is bigger, it has more surface area to heat up. If I take one type of wire, say kanthal, the thinner wire doesn't let as much energy go through it... If you take a thin wire, say 32 gauge, 8 wraps around a 2.5 mm bit would be about 1.8 Millimeters wide and have a high ohms reading of around 3.5 ohms. Those 8 wraps however on the same 2.5mm bit on a thicker wire, say 24 gauge, would be 4.5 milimeters wide and be about .7 ohms. So the thicker coil would be more than double the surface area to the wick... more surface area = more heat applied to the juice = more vapor. However, the thicker wire requires more wattage to heat up.

What that sweet spot is telling you doesn't have to do with vape quality, but more about the sweet spot to use your mod at to get a good balance of what your mod can use compared to what it is most efficient at. If you run the mod at max power all the time, your mod won't be as efficient at using the battery's power. The sweet spot is just telling you what resistance you get the maximum use of your mod. This part of steam-engine is designed to help sort out some of the exaggerations of Variable voltage/variable wattage mods. Some mods claim to support .2 ohms, but they only support that low ohms for a certain range... let me explain.

All mods have a volt and amp limit. volts are how strong the power is going, and amps is the total amount of power being used. the if your mod had an amp limit of... say... 5 amps, it would be limited. Just for learning sake, go over to www.ohmslawcalculator.com and plug in .2 ohms and 5 amps then hit calculate... If the mod claimed it supports .2 ohms, and the board had a 5 amp limit... you could only run that .2 ohms up to 5 watts... which isn't much power at all... but, it can still make the claim it supports .2 ohms. If you put a 1.8 ohm coil in, it can run that coil at 55 watts... so, that mod can run at 55 watts. So, it can truthfully say it's a 55 watt mod that runs .2 om coils... but it cannot run a .2 ohm coil at 55 watts because of it's amp limit. Going back to the sweet spot, that is the best ohm rating that your mod can have the best power range.

Again, long post.. I have the bad habit of doing that. :) hope that helps... Feel free to ask if you have any other questions... I'm crazy enough to like answering questions. :)
 
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