Burnt taste on only one mod

[livelikecrosby]

Hey guys, I'm new to both mech mods and rba's. I just got done building my 4th coil on my RSST and they get better each time. This time I used 400 ss mesh and 30 gauge kanthal. Did only two wraps this time and it's coming out at .8 ohms. About where I wanted it. Checked for hotspots and it was perfect. Filled it up and through it on my SVD at 9 watts and it tasted fine. Put it on my new magneto because I love using it and it tastes extremely burnt.

So I guess my question is, does the magneto just put out too much power for this setup? Do I need to raise the resistance to be able to use it or is there something I'm completely missing? Thanks in advance

 

[Ryedan]

Setting the SVD at 9 watts with a 0.8 ohm coil means it would have to turn the voltage down to 2.7V. The minimum you can set it is 3.3V. I don't know how it handles that, but if it tastes fine it probably is giving you somewhere around 9 watts.

When you put that on a mechanical mod 0.8 ohms draws 4.9 amps at 3.9 volts, which is a fully charged battery (4.2V) with some voltage drop taken into account. That's 19 watts, a lot more than the 9 you are probably getting from the SVD. That will burn your juice with 2 wraps of 30 gauge wire.

I suggest you try a new coil with 4 wraps. Should bring your ohms up to around 1.4'ish, or 11 watts. I bet that will be a lot better for you.

If you want to calculate your electrical settings, here's an online ohm's law calculator. Plug in the volts and resistance and it will tell you the amps and watts. Watts indicate how much heat you're putting into the coil. Use 4 volts if your coil is over 1 ohm.

Good luck with it

 

[livelikecrosby]

Thanks for the advice, I'm an avionics tech in the navy so I understand a lot of those concepts. I figured the magneto was outing out more wattage but wasnt completely sure if that's what it was. And Im not sure why my svd is firing a coil that low, because I have seen that min. number before too. But oh well. Thanks for the help though, I'll have to try that

 

[crxess]

Avionics indicates some level of intelligence. Why then are you messing with things randomly without actual research and a base of knowledge?
All the charts and information you could ever need are already documented right here in the forums and available. No need to put the cart before the horse.

 

[livelikecrosby]

I have done my research, but I guess there were more fields of info that I didn't even think of, so that was some stupidity on my part

 

[Royaldrunker]

The watts will be based on your coil not the mod.. You need to increase surface area especially with ss mesh

Go with 7 wraps and tilt to get the juice on the coil

 

[livelikecrosby]

7 wraps even with 30 gauge?

 

[csantiago1911]

Hey guys, I'm new to both mech mods and RBA's. I just got done building my 4th coil on my RSST and they get better each time. This time I used 400 ss mesh and 30 gauge kanthal. Did only two wraps this time and it's coming out at .8 ohms. About where I wanted it. Checked for hotspots and it was perfect. Filled it up and through it on my SVD at 9 watts and it tasted fine. Put it on my new magneto because I love using it and it tastes extremely burnt.

So I guess my question is, does the magneto just put out too much power for this setup? Do I need to raise the resistance to be able to use it or is there something I'm completely missing? Thanks in advance

Howdy livelikecrosby. I got my start in electronics many (many) years ago as an Avionics tech (equivalent to what you Navy guys would call an AT). My son has a Magneto and I have some pointers that might help you.

Because your Magneto is a straight mech mod with unregulated voltage, understand that your battery state will provide varying power (wattage) output. My 18650 batteries provide 4.2 volts right off the charger and then drop down to the nominal 3.7 volts after some use. So, you need to build a coil that will put you in your sweet spot as your battery charge diminishes.

You already know you like the vape produced by 9 watts. I reccommend you build a coil for 1.7 ohms and see if you like it. A 1.7 ohm coil will give you:

10.4 watts @ 4.2 volts
8.05 watts @ 3.7 volts (at this point, if the vape quality becomes unsatisfactory you could swap in a new battery)
6.02 watts @ 3.2 volts (swap battery at or before this point... excessively-discharging your battery is bad)

 

[livelikecrosby]

@csantiago1911 thank you for the specific info. I'll definitely give that a shot. And thank you for your service!

 

[Mitey F]

The watts will be based on your coil not the mod..

I HATE it when people spread misinformation just because they don't know what the hell they're talking about. Watts are a function of coil resistance AND battery voltage. The battery/mod plays an EXTREMELY important role in calculating watts!

If you don't know what you're talking about, please don't give advice.