Ohms do matter

[sofarsogood]

KTMrider argued that varying the ohms of the coil doesn't change the run time of a regulated mod at a given watts setting. That was contrary to my intuition and (limited) experience but I checked the steam engine calculator and he is right. But that's not the whole story.

Today I'm vaping a 28 guage 1.2 ohm Ti contact coil on an rda fired by a Kangxin mini set to 340 degrees (probably 420 actual) and 40 max watts. I'm sure I'm getting the best vape I've experienced in a year of vaping including 6 months of building single coils on regulated mods. I've never built dual coils but the amount of wire in this single coil (about 18 wraps on a 3 mm rod) might be similar).

The advantages should be a simpler build and a lot more efficiency producing heat. Is anybody else using high ohm coils with temp control? If not I wish somebody with significantly more experience than me would try a high ohm Ti build to see what I'm talking about. Regardless, I suppose I won't be going back to .15 ohm nickel builds. That makes no sense to me now.

P.S. I'm a KLX rider, and a TDub rider.

 

[pbanj]

with tc i have found that anything under .1 u can feel the pulsing more as it hits temp a lot quicker.

 

[sofarsogood]

with tc i have found that anything under .1 u can feel the pulsing more as it hits temp a lot quicker.

My kangxin mini doesn't pulse or do anything out of the ordinary at 1.2 ohms. It's not a fancy or pricey mod. What is the highest ohm coil you've tried?

The Kangxin will fire a 1.2 ohm coil even though the spec shet says the max is 1 ohm. Will other TC mods exceed their rated maximum? And why have that limit?

 

[pbanj]

my titanium coils in my stm come out to around .3 ohms the lowest i have tried is .06 nickel coil

 

[BigEgo]

Not sure what battery life has to do with the rest of your post.

 

[sofarsogood]

Not sure what battery life has to do with the rest of your post.

Opps, you're right. A higher ohm coil converts watts into heat more efficiently so run time is increased by using less watts to produce a given amount of heat. Temp control will ramp up the power for the first fraction of a second so that a larger, higher ohm coil will get to temperature as fast as a low ohm coil for practical purposes. Then the temperature is maintained with less watts because of the higher resistance. So why use a low ohm coil?

 

[pbanj]

Opps, you're right. A higher ohm coil converts watts into heat more efficiently so run time is improved by using less power to produce a given amount of heat. Why use a low ohm coils with temp control?

Space and device limits. My device will only do tc on coils 1ohm and under. The wires used for temp control are pretty low resistance.

 

[zapped]

LMAO at the words "high ohm coil" being used to describe 1.2 ohms.

1.2 is not high ohms its barely above sub ohm.

I vape at 3ohms.

And there are a lot of benefits to doing so.

One is MUCH longer battery life than sub-ohmers, another is less juice consumption.

You guys really are a diferent breed arent ya?

 

[sofarsogood]

Space and device limits. My device will only do tc on coils 1ohm and under. The wires used for temp control are pretty low resistance.

The spec sheet for my device says 1 ohm max but it's working fine with 1.2 ohm. How about try a higher ohm build and see what happens. It's all for science, right?

LMAO at the words "high ohm coil" being used to describe 1.2 ohms.

1.2 is not high ohms its barely above sub ohm.

I vape at 3ohms.

And there are a lot of benefits to doing so.

One is MUCH longer battery life than sub-ohmers, another is less juice consumption.

You guys really are a diferent breed arent ya?

You may be overlooking that 1.2 ohm is only the starting resistance. When that coil gets to temperature, Within a fraction of a second, the ohms have increased to about 2.4 which is not far from your kanthal builds. I'm working my way up and may get to your 3 ohms under load.

 

[TheotherSteveS]

the difference here is the coil mass! For a kanthal coil of a given guage and resistance, you need more than three times as much Ti wire to make the same resting resistance. That is a lot of metal to heat up!!!

 

[zeus01]

sometimes its a limitation to the build itself.
i mean even if i wanted to make a 2-3 ohm coil
its not feasible with the materials on hand 0.40 and 0.50 wires of ti are the only gauges that are available.
fitting in a 15 wrap coil makes it hard to moun t the coil as well
plus making a dual coil,
cuts the resistance in half,..

but essentially higher ohm coils are a better per se for runtimes,
one you are not pulling as much amps on the batt,
thus giving you more runtimes.

i think

 

[TheotherSteveS]

sometimes its a limitation to the build itself.
i mean even if i wanted to make a 2-3 ohm coil
its not feasible with the materials on hand 0.40 and 0.50 wires of ti are the only gauges that are available.
fitting in a 15 wrap coil makes it hard to moun t the coil as well
plus making a dual coil,
cuts the resistance in half,..

but essentially higher ohm coils are a better per se for runtimes,
one you are not pulling as much amps on the batt,
thus giving you more runtimes.

i think

30g is available, and 32...even higher if you look around!

eg
http://www.zivipf.com/epages/638622...hops/63862298/Categories/Heizdraht/Titandraht

 

[zeus01]

30g is available, and 32...even higher if you look around!

eg
http://www.zivipf.com/epages/638622...hops/63862298/Categories/Heizdraht/Titandraht

hahahhahaha not really if you live in a country (ph)
where variable mods are viewed as weak devices and just fancy looking things
and where mechanical boxes and mods are still a fad,
and cloudchasing is a norm and a must to some

 

[KenD]

Opps, you're right. A higher ohm coil converts watts into heat more efficiently so run time is increased by using less watts to produce a given amount of heat. Temp control will ramp up the power for the first fraction of a second so that a larger, higher ohm coil will get to temperature as fast as a low ohm coil for practical purposes. Then the temperature is maintained with less watts because of the higher resistance. So why use a low ohm coil?

Well, no. It's not about ohms but coil mass (tried to say that earlier). More mass = more power to heat up, but will stay hot longer. Less mass = less power to heat up, but will cool down quicker. If the same gauge wire is used a higher resistance coil is not intrinsically more effective than a lower resistance coil. With the former you'll need more power to heat it up but potentially less power to maintain temp, with the latter you'll need less power to heat up but potentially more power to maintain the temp. Not counting for device quirks, the end result should be comparable.

It's about coil mass, not resistance.

Sent from my C6903 using Tapatalk

 

[edyle]

Opps, you're right. A higher ohm coil converts watts into heat more efficiently so run time is increased by using less watts to produce a given amount of heat. Temp control will ramp up the power for the first fraction of a second so that a larger, higher ohm coil will get to temperature as fast as a low ohm coil for practical purposes. Then the temperature is maintained with less watts because of the higher resistance. So why use a low ohm coil?

check under 'mod range' in steam engine to find the ohms 'sweet spot' for your device.

 

[BigEgo]

Opps, you're right. A higher ohm coil converts watts into heat more efficiently so run time is increased by using less watts to produce a given amount of heat. Temp control will ramp up the power for the first fraction of a second so that a larger, higher ohm coil will get to temperature as fast as a low ohm coil for practical purposes. Then the temperature is maintained with less watts because of the higher resistance. So why use a low ohm coil?

You use a lower ohm coil not because of the resistance, but because it gives you more coil mass and surface area which equals more vapor production. The temperature itself has very little to do with vapor production; indeed higher ohm (smaller mass) coils will run at a HIGHER temperature (at the same power level) than a lower ohm coil with more mass. This is why you can't vape a kayfun 1.5Ω coil at 40 watts like you can a subtank -- you will vaporize the juice too fast on the coil, which means the wicking can't keep up, which means it tastes burnt.

 

[sofarsogood]

Well, no. It's not about ohms but coil mass (tried to say that earlier). More mass = more power to heat up, but will stay hot longer. Less mass = less power to heat up, but will cool down quicker. If the same gauge wire is used a higher resistance coil is not intrinsically more effective than a lower resistance coil. With the former you'll need more power to heat it up but potentially less power to maintain temp, with the latter you'll need less power to heat up but potentially more power to maintain the temp. Not counting for device quirks, the end result should be comparable.

It's about coil mass, not resistance.

Sent from my C6903 using Tapatalk

The specific gravity of Kanthal is 8.41 http://www.tempco.com/accessories/wireA.htm
Titanium has a specific gravity of 4.5 (times the weight of water), half as much. http://www.engineeringtoolbox.com/specific-gravity-solids-metals-d_293.html This difference means titanium holds less heat than kanthal the same as aluminum holds less heat than iron. Which should also mean Ti will start radiating heat sooner than Kanthal and cool down faster. In watts mode higher ohm coils take longer to heat up or an uncomfortable amount of power has to be used. Temp control works around that by spiking the power in the beginning then automatically throttling back.

The experience I'm having suggests that a longer single coil managed by temp control will give the same results as dual coils with less power consumption.

So put a 1.2 ohm Ti coil on your TC mod and see if it will fire. If it will you might have a pleasant surprise.

 

[KenD]

The specific gravity of Kanthal is 8.41 http://www.tempco.com/accessories/wireA.htm
Titanium has a specific gravity of 4.5 (times the weight of water), half as much. http://www.engineeringtoolbox.com/specific-gravity-solids-metals-d_293.html This difference means titanium holds less heat than kanthal the same as aluminum holds less heat than iron. Which should also mean Ti will start radiating heat sooner than Kanthal and cool down faster. In watts mode higher ohm coils take longer to heat up or an uncomfortable amount of power has to be used. Temp control works around that by spiking the power in the beginning then automatically throttling back.

The experience I'm having suggests that a longer single coil managed by temp control will give the same results as dual coils with less power consumption.

So put a 1.2 ohm Ti coil on your TC mod and see if it will fire. If it will you might have a pleasant surprise.

I'm talking about the same wire type, same gauge here. Otherwise it's absolutely no point in discussing higher vs lower resistance. The differences will be largely about wire type and/or gauge otherwise. If you're comparing two different types of wire, you're really not comparing differences due to resistance at all.

As for a 1.2 ohm coil. I use 26 and 28 ga titanium, and getting a 1.2 ohm coil - even a single coil - fit in the atties I use would not be easy. At the very least, airflow would be compromised.

Sent from my C6903 using Tapatalk

 

[sofarsogood]

As for a 1.2 ohm coil. I use 26 and 28 ga titanium, and getting a 1.2 ohm coil - even a single coil - fit in the atties I use would not be easy. At the very least, airflow would be compromised.

Sent from my C6903 using Tapatalk

28 guage Ti, 16 wraps, 3 mm dia. contact coil. That's what I'm running on a 22mm 3 post rda as we speak. The best vape by far I've managed since this all started for me. (I never built any dual coils. Now I know what I was missing.)

 

[pbanj]

The spec sheet for my device says 1 ohm max but it's working fine with 1.2 ohm. How about try a higher ohm build and see what happens. It's all for science, right?

My device auto kicks out of temp mode with anything that is over 1ohm. Also there is no way in hell I could build a 1.2 ohm coil to fit in the stm using 26g ti.