Just ordered an itaste VV (Variable Voltage & Wattage with OHMz checker) really like it due to the mini usb port on the bottom considering i am always close to a computer and can use it to charge the battery and also use the cable as a pass through. My question is, while i wait for my coils for my pro tank 3 i picked up today an Aspire bottom dual coil tank, which has a 2.1 OHM head in it which also has a label that reads (3.0-6.0v) right on the head... Now considering this is a dual coil tank that would mean that each coil is actually at 4.2 OHMz? correct me if i am wrong but that means that at if the itaste VV supports a range of 3.0-5.0v i could rock this tank at 5.0v and if would not hurt the head correct? If someone would also like to explain the benefit of doing this and not just running it at a low voltage like 4.0-4.4? Will i get more vapor at a high voltage? or a better throat hit? What is the advantage and disadvantage to both and how do i find the "Sweet Spot" as far as voltage goes. thanks for the help! As of right now i am running that aspire BDC tank with an ego twist and it seems like i get a better vape at 4.2-4.4 then at 4.8 (which is the max setting for an ego twist) so will the itaste preform differently?? thanks everyone!
Help me to better understand OHMz vs Voltage
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Disclaimer: This is the most simplistic explanation and is addressed to new vapers mostly or vapers who are happy within the recommended "just right" power zone (4.5-8 watts). If you are using dual coil atomizers or are interested in high wattage vaping, it's a different conversation altogether. 
You will also have to understand the concept of amp limits and how it applies to high power vaping. In short, dual coil atties cosist of two coils configured in parallel, which means that a 2.1Ω atty is really two 4.2Ω coils--so calculate your wattage based on the 4.2Ω number--not 2.1Ω--roughly. To make it simpler--dual coil atties require more wattage than singles, but not quite twice as much. They produce more vapor due to increased surface. When in doubt--start low and adjust up as needed.
Ohm's Law as it pertains to vaping is really not that complicated--and it's very useful when you want to know what you're doing.
Voltage and wattage are often misunderstood by new vapers. Wattage is the power (heat, sweet spot) that your PV (battery and atomizer) generates. Wattage = Voltage (of your battery) squared divided by Resistance (Ω) of your atomizer [P=V[SUP]2[/SUP]/R]. If you're not good at math, don't worry, use this easy calculator:
Online Conversion - Ohm's Law Calculator
Of course, if you own a VW (variable wattage) device, you don't really need this calculator because your device will do the math for you.
The wattage you want, especially at the beginning of your vaping career, should be somewhere between 4.5 and 8.5 Watts. Anything lower than 4.5 watts may not vaporize your juice properly and will not produce enough warmth and vapor. Anything above 8.5 watts increases the risk of burning the filler in your cartomizers (if you're using them) and even some juices, especially the delicate ones.
There are, of course, other variables, like eliquid and JDD (juice delivery devices) that you're using on your batteries. Seven watts on a filler type cartomizer may feel different than the same 7 watts on a fillerless clearomizer or a dripping atomizer. The same is true for different eliquids; tobaccos, chocolate and coffees generally require more wattage (heat), while fruit and other delicate flavors do better with less heat. Everyone's sweet spot is different--those are just very general guidelines.
Experiment and you'll find your own bliss in no time!
The chart below is a good guide to safe vaping, even though some think it's a bit conservative.
You will also have to understand the concept of amp limits and how it applies to high power vaping. In short, dual coil atties cosist of two coils configured in parallel, which means that a 2.1Ω atty is really two 4.2Ω coils--so calculate your wattage based on the 4.2Ω number--not 2.1Ω--roughly. To make it simpler--dual coil atties require more wattage than singles, but not quite twice as much. They produce more vapor due to increased surface. When in doubt--start low and adjust up as needed. Ohm's Law as it pertains to vaping is really not that complicated--and it's very useful when you want to know what you're doing.
Voltage and wattage are often misunderstood by new vapers. Wattage is the power (heat, sweet spot) that your PV (battery and atomizer) generates. Wattage = Voltage (of your battery) squared divided by Resistance (Ω) of your atomizer [P=V[SUP]2[/SUP]/R]. If you're not good at math, don't worry, use this easy calculator:
Online Conversion - Ohm's Law Calculator
Of course, if you own a VW (variable wattage) device, you don't really need this calculator because your device will do the math for you.
The wattage you want, especially at the beginning of your vaping career, should be somewhere between 4.5 and 8.5 Watts. Anything lower than 4.5 watts may not vaporize your juice properly and will not produce enough warmth and vapor. Anything above 8.5 watts increases the risk of burning the filler in your cartomizers (if you're using them) and even some juices, especially the delicate ones.
There are, of course, other variables, like eliquid and JDD (juice delivery devices) that you're using on your batteries. Seven watts on a filler type cartomizer may feel different than the same 7 watts on a fillerless clearomizer or a dripping atomizer. The same is true for different eliquids; tobaccos, chocolate and coffees generally require more wattage (heat), while fruit and other delicate flavors do better with less heat. Everyone's sweet spot is different--those are just very general guidelines.
Experiment and you'll find your own bliss in no time!
The chart below is a good guide to safe vaping, even though some think it's a bit conservative.
How to find the sweet spot.
Easy, start at a low voltage, puff on it it, if its to weak pump it up. Repeat until you like the vape.
Easy, start at a low voltage, puff on it it, if its to weak pump it up. Repeat until you like the vape.
so according to this chart if my atty is a 2.0 ohm dc and im vaping in power mode on my zmax at 7.5watts i am within the "just right" spot?
ive also done some reading on lower ohm attys and may be misunderstanding but it seems they work better and have a more flavorful taste. for instance on my ego-ctwist i was running at around 4.0-4.3v with a single 1.8ohm atty in my unitank and always had great flavor and awesome clouds, could i do the same with a lower ohm dc atty and my zmax?
ive also done some reading on lower ohm attys and may be misunderstanding but it seems they work better and have a more flavorful taste. for instance on my ego-ctwist i was running at around 4.0-4.3v with a single 1.8ohm atty in my unitank and always had great flavor and awesome clouds, could i do the same with a lower ohm dc atty and my zmax?
Voltage and wattage are just to different ways of getting to the same spot, being a good tasting vape. If you adjust your voltage up till it tastes good, then up some more till it starts to taste burned, you are now surpassing the wicking and or air supply that the atomizer you are using can handle, turn it down till the burn taste is gone and tastes good again, that's your sweet spot for that atomizer and juice. Calculate the wattage using ohms law.
Now do the same thing in wattage mode, adjust it up till it's no longer vapeable then turn it down till it's all good, chance are you will be at the same spot if using the exact same atomizer and juice.
With regulated mods we all adjust them to where they vape best, whether we use VV or VW. The main advantage of VW is that whatever atomizer one uses it will start out at the same wattage that was set. With VV, yes it will start out at the same voltage, but if your ohms is different then the wattage value will change.
Does this mean VW mode is better, um no, not all atomizers will produce the same vape at the same wattage because some can handle higher watts, some can't so most need to adjust the level to get the best vape possible that the atomizer can produce.
Most of my atomizers can handle significantly higher watts than most regulated mods can handle, so I find VW more convenient to use, I just crank it up to max watts and no matter which tank I put on, it will deliver the best vape possible that the mod can deliver. With my VV devices, I run up against the amp and watt limit that the mod can produce, so when I switch out a different ohm atomizer I have to adjust the voltage up or down until I am at or bellow that amp or watt limit, whichever comes first.
Now do the same thing in wattage mode, adjust it up till it's no longer vapeable then turn it down till it's all good, chance are you will be at the same spot if using the exact same atomizer and juice.
With regulated mods we all adjust them to where they vape best, whether we use VV or VW. The main advantage of VW is that whatever atomizer one uses it will start out at the same wattage that was set. With VV, yes it will start out at the same voltage, but if your ohms is different then the wattage value will change.
Does this mean VW mode is better, um no, not all atomizers will produce the same vape at the same wattage because some can handle higher watts, some can't so most need to adjust the level to get the best vape possible that the atomizer can produce.
Most of my atomizers can handle significantly higher watts than most regulated mods can handle, so I find VW more convenient to use, I just crank it up to max watts and no matter which tank I put on, it will deliver the best vape possible that the mod can deliver. With my VV devices, I run up against the amp and watt limit that the mod can produce, so when I switch out a different ohm atomizer I have to adjust the voltage up or down until I am at or bellow that amp or watt limit, whichever comes first.
Actually, it might be a bit low with a dual coil atty. You see, when you throw 7.5 watts into two coils, each coil gets approximately 3.75 watts ( if its perfectly balanced) of power, which is very different from 7.5 watts going all into one coil (at the same total ohms). If you like that setting, by all means, use it. But if feels too tame, crank the wattage up to 9-10 watts and see what happens.
They don't really work "better"--they just get more wattage thrown at them. They are like only children--they don't have to share.
A 1.8Ω DC atty consists of two 3.6Ω coils configured in parallel. However, the battery doesn't care how many coils are attached to it--it just reads the final resistance of the atomizer. A 1.8Ω single coil atomizer will run much hotter than your 1,8Ω DCC, which splits the load between two 3.6Ω coils (thus producing a cooler but more voluminous--due to increased surface area--vape). The main reason DC cartomizers were invented in the first place was to decrease the heat of the coils to prevent burning of filler in cartomizers (the first dual coils were used in cartomizers).
The problem with this calculation was that it increased the demand for amps the battery needed to supply and decreased the overall heat (power) of each coil, thus requiring higher voltages.
This is how I see it. Let's say I like to vape at 8 watts. If I tell my PV to supply 8 watts to two coils, my atomizer will not vape the same as it would if it only had to apply 8 watts to one coil--a single coil would be working at 8 watts, two coils--at 4 watts each, more or less. In theory, at least, as I explained above.
In the real world, the realized, true experience would be probably somewhere between the two wattage figures--when using a dual coil device.
In my own experience, I can't put a 1.8Ω single coil stock cartomizer much above 4volts (8.9W) and enjoy the vape--it's too hot and harsh for me. The highest I can comfortably go with a single-coil 1.8Ω atty is maybe 3.6 volts or so (7.2 watts).However, I have absolutely no problem vaping a 1.8Ω DCC at 4.0v and I have no issues with dry hits or burnt taste whatsoever.
Thanks for the advise like i said before with this 2.0 ohm dc atty and my zmax at 7.5watts it worked well enough i guess but the clouds were not very big turning it up to around 9-9.5watts helped and made a huge difference in the cloud output.... also noticed i didn't have to take near as long of drags off it... before i would do strait lung hits for something like 5-10 seconds just to get decent clouds not anymore lol as you can tell im still new to the vv vw side and yeah learning all the technical jargon is helping me in my quest for the next upgrades like rba's and the like
lmao had to edit this post four times to get the quote right
If big clouds are what you are after switch to high VG content juices. Then you want have to worry about single vs dual or ohms as much.
I tried some juice from Fuzion, they mix at 65% VG / 35% flavor 0 PG. Huge clouds, decent flavor, 0 throat hit. I prefer huge flavor and decent throat hit. Cloud size doesn't matter to me. So I'm back to higher PG (70%) to get the TH.
Sounds like you want clouds so try some high VG juice.
I tried some juice from Fuzion, they mix at 65% VG / 35% flavor 0 PG. Huge clouds, decent flavor, 0 throat hit. I prefer huge flavor and decent throat hit. Cloud size doesn't matter to me. So I'm back to higher PG (70%) to get the TH.
Sounds like you want clouds so try some high VG juice.
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