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Low ohm mtl

Discussion in 'RDA' started by Scherzhertz, Aug 1, 2019.

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  1. Scherzhertz

    Scherzhertz Full Member

    Jul 6, 2019
    In my city vape shop doesnt have a khantal wire , they only have nichrome wire which has low ohm , i want to mtl style vape , can i use low watt with low ohm coil??
     
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  2. HigherStateD

    HigherStateD Ultra Member ECF Veteran

    I'm not a MTL vaper, but I seen plenty of off the shelf low ohm MTL setups. In a regulated setup, resistance doesn't matter. Look at the Orion DNA go pod. 0.20 Ohm MTL coil.
     
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  3. AngeNZ

    AngeNZ Lunatic ECF Veteran

    Supporting member
    Mar 24, 2018
    New Zealand
    Yeah n80 wire will work fine for a mtl coil. Get 28gauge if you can. It's only slightly lower in resistance than kanthal. You can make the same ohm coil - just add an extra wrap or two.
     
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  4. Scherzhertz

    Scherzhertz Full Member

    Jul 6, 2019
    Well the vape shop only have 24 awg
     
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  5. AngeNZ

    AngeNZ Lunatic ECF Veteran

    Supporting member
    Mar 24, 2018
    New Zealand
    well that sucks ;) Can you order online instead? the problem with 24gauge at low wattage is it will take forever to heat up.

    28gauge kanthal or N80 wire would work a lot better
     
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  6. HigherStateD

    HigherStateD Ultra Member ECF Veteran

    An electronics supply store maybe? Make sure to clean any machining oil though.
     
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  7. bombastinator

    bombastinator ECF Guru Verified Member ECF Veteran

    Sep 12, 2010
    MN USA
    It’s not impossible to do it with 24g. It will take a fairly long coil though to get it to a good ohm rating, and @AngeNZ is dead right about the long ramp up time. Coil will be big enough it won’t fit in some attys. What atty you using?
     
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  8. Scherzhertz

    Scherzhertz Full Member

    Jul 6, 2019
    I use convergent rda with mtl airguide , and mtl need long ramp up time isnt it?
     
  9. bombastinator

    bombastinator ECF Guru Verified Member ECF Veteran

    Sep 12, 2010
    MN USA
    Normally no. One of the nice things about MTL is it generally doesn’t. That thick 24g wire will only heat so fast though and you’re going to need quite a bit of it to get the ohms up. 28g is really much preferable. Only bright side is that thick coil will take forever to wear out.

    That’s a big giant single coil RDA though. You should have plenty of room for a long coil.
     
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  10. uthinkofsomething

    uthinkofsomething Ultra Member ECF Veteran

    Supporting member
    Jun 7, 2015
    Toledo, Ohio
    Just so we know we're talking about the same thing, ramp up time is how long it takes the coil to heat up enough to produce good vapor.
    MTL does not have to be long ramp up. Higher resistance at low wattage with simple coils can ramp up pretty fast. It's all about the mass of the coil. Bigger coil takes more power to heat the same as a small coil.
     
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  11. bombastinator

    bombastinator ECF Guru Verified Member ECF Veteran

    Sep 12, 2010
    MN USA
    You got it. Thinner wire makes for a smaller coil.

    Was just poking about on my coilbuilder app. 2.5mm coil with 10 wraps of that 24g would give you around a bit over .6ohm, which is about as low a resistance and as high a coil diameter as you can go for MTL. Kind of pushing it really.
    Even 14 wraps would get you barely over .8, and that’s a long long coil. If they get too long they don’t feed juice all the way to the center of the coil and the wick dries out and burns.

    If you had 28ga an 8 wrap coil of that diameter would be near 1.1ohm. Much easier to deal with
     
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  12. Zakillah

    Zakillah Super Member ECF Veteran

    Jan 24, 2015
    Vienna
    Thats why you dont build for resistance on a regulated mod. If 24G is all you have you´d be much better off building a small coil with low resistance then building a huge one which will take forever to heat up.
    Get this: Resistance doesnt matter.

    Get thinner wire. There is no other way getting a good mtl/low power vape.
     
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  13. KurtVD

    KurtVD Super Member ECF Veteran

    Jul 2, 2018
    Switzerland
    I have never really understood the relationship between resistance and the style of vaping (MTL or DL). More or less by accident, I started MTL vaping with very low resistance coils (Ni200 30Ga, 0.10 or even less) and it always worked out fine for me.
    So you're saying it's all about ramp up time?
     
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  14. Scherzhertz

    Scherzhertz Full Member

    Jul 6, 2019
    So what i need? A small coil with small resistance or big coil/long coil with high resistance?
     
  15. Zakillah

    Zakillah Super Member ECF Veteran

    Jan 24, 2015
    Vienna
    Ramp up is a part of it. Large/big mass coils are worthless if you intend to throw 10 Watts at them. If you try to mtl and just use more Watts to get them going, the limited airflow doesnt cool that huge coil enough, resulting in hot whiffs of thin vapor. Thats not a good vape.

    You have to build your coil with those things in mind first and foremost. What resistance you end up with is totally irrelevant (unless you use a Mech); the size and mass must be fitting to your airflow and intended power. Again, do yourself a favor and forget about resistance.
     
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  16. KurtVD

    KurtVD Super Member ECF Veteran

    Jul 2, 2018
    Switzerland
    So if you’re saying ‘big mass’ coil, this means a coil with a lot of wire (eg Clapton and or lots of wraps) or a thick wire?
    Now I understand...the first time when I bought wire, I went to a vape shop, and the owner had a look at my tank before he sold me a 30Ga spool. Ever since I have stuck with thin wires, and I build simple coils with just 5 wraps. That’s why I’ve always been happy with my vape experience, I guess...
     
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  17. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
  18. AngeNZ

    AngeNZ Lunatic ECF Veteran

    Supporting member
    Mar 24, 2018
    New Zealand
    You need thinner wire - 28 gauge, Kanthal, N80 or SS316l. Depending on the RTA/RDA you'd use a 2.5mm id or 3mm id coil. The number of wraps you use, is according to what ohms you want your coil to be.

    I do a mtl 2.5mm id ss316l 6 wrap coil which comes out around 0.6ohms. I vape that at 15w - because of the thin wire - it heats up immediately (ramp up).

    The same 2.5mm id 6 wrap coil in 28ga N80 would be 0.9ohm. Using kanthal a1 it would be 1.2ohm
     
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  19. m1ke

    m1ke Senior Member ECF Veteran

    Feb 18, 2013
    North East USA
    Coil wrapping | Steam Engine | free vaping calculators

    Look at that page. The heat capacity on a .4Ω coil (~ 7 wraps) with that material would be an intense MTL experience unless your tank has a lot of airflow. I'm not familiar with the Convergent RDA.

    I'm using a .56Ω coil in a Berserker Mini and it's warm and flavorful, but it doesn't get my tank hot. The Berserker has a tight airflow system. I had to understand the tank's airflow before I found what I liked. I don't like coils with a heat capacity greater than 20 mJ/K in it.

    This is the coil I'm using:
    Coil wrapping | Steam Engine | free vaping calculators
     
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  20. KurtVD

    KurtVD Super Member ECF Veteran

    Jul 2, 2018
    Switzerland
    Or if you want to go ultra-low, the same coil in Ni200 30Ga would be about 0.07 Ohm (close to the lower limit of most devices)
     
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