Kanthal & Ni200 for TC

[longy01]

I'm doing 2 x 10 2.5mm wraps with 30g NI200 to get a 0.1 dual coil build in a Zephyrus. If I try with 28g it's too low, but I think it's the coil spacing that causes the issue. If I do a very tight coil the resistance is always way too low as it's bridging. I don't dry burn NI coils either so it's harder to tell what's going on.

I can get down to 28g in the Bellus as it has the room and I have a good performing 3mm dual coil build in there at the moment.

Using 2.5mm coils with 30g in a TFV4 dual coil deck too.
danjabu are you changing the settings for your X Cube II on the device or using the app? When I first got mine the changes on the app didn't stick a few times so I do everything on the mod now. Latest firmware is a lot better with TC than the one it shipped with so worth upgrading if you haven't already.

danjabu - These are pretty good base settings to aim for. Dual core builds with ni200, 28 - 30 gauge wire, no lower than 28. Anything lower is pretty much useless for tc. And try and aim for a target resistance of 0.15. Seems to be the magic number.

After spending £20 in nickel, this is probably the last thing you want to hear but another option for tc builds is Stealthvapes NiFe wires. I have started using this and the upshot is that I'll never build with ni200 again.

 

[danjabu]

Yeah I've been monitoring the efficiency of the app to mod offset and realised the new patch is a lot more effective in regards to saving the changes! I think I might buy some 30g as I'm getting no where with 28 or below. Closest I come is a dual coil at 0.08 which is still too low...

Yeah I think it is a lot of issues with spacing, of course contact coils ohmages are lower than the spaced builds but even they don't make much difference maybe 0.01/0.02 difference.

Guess I just need to keep going at it. I was thinking of trying a dual 10 wrap 2mm set see what that comes too.

May end up just going for Ti, made one for a customer with his Ti worked flawlessly first time :'-(

 

[longy01]

Yeah I've been monitoring the efficiency of the app to mod offset and realised the new patch is a lot more effective in regards to saving the changes! I think I might buy some 30g as I'm getting no where with 28 or below. Closest I come is a dual coil at 0.08 which is still too low...

Yeah I think it is a lot of issues with spacing, of course contact coils ohmages are lower than the spaced builds but even they don't make much difference maybe 0.01/0.02 difference.

Guess I just need to keep going at it. I was thinking of trying a dual 10 wrap 2mm set see what that comes too.

May end up just going for Ti, made one for a customer with his Ti worked flawlessly first time :'-(

28 awg NiFe 30. 10 wraps around a 3mm bit, dual core in my velocity comes out at 0.16. Also it's a lot easier to build with (think somewhere between nickel and kanthal).

 

[chimerax]

I can get 0.07 to fire without any problems on the Sigelei 75w and the X Cube 2, but I do get better performance on 0.1 and 0.12 which most of my coils come to now.

I do keep having major problems with 28/29g NI200 on the Zephyrus though even though when I first build it it reads at 0.12 or 0.13. As soon as it's wicked and juiced it drops down to 0.5 or less and I can't work out why. As soon as I use 30g the problem goes away. I don't get that problem on the Bellus though and can happily use 28g wire.

I think NI200 flexes more when it heats, and unless your build is absolutely perfect it can short one side or contract and bridge a coil. Always looks OK when I take it apart again to see what's wrong though. I'm thinking of giving up on TC builds in the Zephyrus tanks I have though and going back to kanthal for those. I may give titanium a try to see how well they fare with that though.

 

[danb]

I tried a dual coil 6 wrap 22g Ni200 build, resistance was low and i mean really low, so re wrapped for 8 wraps a coil and it came out registering at 0.12ohms,

Tried again with the same build pinched, same result. Tried a 8 wrap spaced with 28g and resistance came out to 0.21, set the coefficient again to make sure it was correct, and again dry hit burnt cotton.

Probably a sizeable static resistance is the problem, these resistances sound way, way too high for the builds you describe. However, until you supply all the details (coil diameter is missing), this is a guess. Even so, assuming your coil ID is 2-3 mm, I reckon you've got a static resistance around 0.10 Ohm based on steam engine - this completely ruins TC (same happens on my KF4). The issue will be less severe if you switch to Ti but it will still be there (and overheating Ti is not good). It's possible that you can fix it by checking all your contacts, but this might have to be a kanthal only atty...