RDA and Mech Mod Intro

[oldhippydude]

Sorry that one confused me. You said Lower ohms = more power = more heat = more vapour So surely removing a wrap and therefore lowering the ohms would be harder hitting? The way you phrased the above sounded like it would make it less hard hitting.

Start higher res ie lower power and safer. Vape it see what you think. If it is not enough oomph for you remove a wrap and get more oomph.
If you find the coil has too much oomph then you have to build a new coil.

It makes sense to me

 

[oldhippydude]

Every time you adjust a coil check the resistance to make sure you are still within safe cdr and have not introduced a short.

 

[speedfreek67]

On a regulated mod you can adjust the wattage, but on a mech the power output is a function of the resistance of the coil and battery voltage.

The type of vape you get depends on a few factors, like the size of the chamber in your RDA and the amount of airflow, but the dominant factor is indeed the resistance of your coils.

The lower the resistance (ohms), the more power (watts) you are putting through the coils.

So, putting in a lower ohm coil is like turning up the wattage, and putting in a higher ohm coil is like lowering the wattage.

You already know how to calculate the amps:

Volts/Ohms = Amps

Earlier we calculated the maximum amp draw on your battery, using the full charge of 4.2 volts to find our safety limit and check it is within the Constant Discharge Rate of the battery.

4.2/0.2 = 21 amps.

Now we can look at the equivalent wattage.

Volts x Amps = Watts

4.2 x 21 = 88.2 watts

So, the theoretical maximum wattage of that build is 88.2 watts.

You can see that if the ohms were higher, the amps would be lower. And if the amps are lower, the wattage will be lower.

Now, in the real world, you won't get an 88W vape from putting that build on a mech, like you would if you put it on a regulated mod and set it to 88W. The reason for this is that the voltage that the battery outputs gets lower (or "sags") with a higher amp draw. It will be closer to 3.7 volts that actually hit the coil, maybe a little more or maybe less. This is the reason for the nominal voltage printed on the side of the battery.

So you'll end up with a vape somewhere between 70 and 80 watts on a fully charged battery.

If you do the maths, you would see that if you doubled the ohms to 0.4 you would halve the wattage to 44.1 watts, and if you went the other way and halved the ohms to 0.1 (*NOT SAFE!!*), you would double the wattage to 176.4 watts!

 

[ChrisMcrUK]

Start higher res ie lower power and safer. Vape it see what you think. If it is not enough oomph for you remove a wrap and get more oomph.
If you find the coil has too much oomph then you have to build a new coil.

It makes sense to me

Gotcha, thanks for your help. I currently vape at 0.16ohms and take quite big draws so I'm used to the lower resistance, but that's using a sub ohm tank so I guess it's not the same as using a mech?

 

[ChrisMcrUK]

Oh and that's at 95W

 

[oldhippydude]

Battery sag is one of the reasons i do not personally understand why pushi

Gotcha, thanks for your help. I currently vape at 0.16ohms and take quite big draws so I'm used to the lower resistance, but that's using a sub ohm tank so I guess it's not the same as using a mech?

but what watts do you put through that coil?

 

[oldhippydude]

I would not even try to get 95 watts out of a single cell mech.
Personally I would want a dual cell paralell for that.
Pushing to and beyond safe cdr sag gets worse and worse. Pissing in the wind.

 

[speedfreek67]

Gotcha, thanks for your help. I currently vape at 0.16ohms and take quite big draws so I'm used to the lower resistance, but that's using a sub ohm tank so I guess it's not the same as using a mech?

Well, it's more about the vape the RDA gives you versus the sub ohm tank. The RDA will be a different experience. You may find the 0.2 build in the RDA suits you, even at a lower wattage, as a lot can depend on the chamber and airflow.

 

[ChrisMcrUK]

Ye

Well, it's more about the vape the RDA gives you versus the sub ohm tank. The RDA will be a different experience. You may find the 0.2 build in the RDA suits you, even at a lower wattage, as a lot can depend on the chamber and airflow.

Yeah I get that it's all about trial and error, so looking forward to trying different things. I've read up on ohm's law so feel confident that I'll be using the mech safely, so going to try different builds until I find what works. I wanted to try RDA's for better flavour so also looking forward to trying different liquids and seeing what gives the best taste

 

[ChrisMcrUK]

Sorry I asked this the other day but didn't actually get an answer. In terms of changing the cotton and coil, is it the same as sub ohm tanks in the sense that you change them when the flavour starts to go or you get a burnt taste?