VTR amp limit and lowest resistance

[VapinSweetZ]

Hi guys I have few questions about the VTR but please feel free to mention ANYTHING else that you think/know about the device and I should know before getting it.

1. With my sigelei ZMAX V5 I had to stack 2 18350 to reach the amp limit of the device (4A), with only 1 18650 battery I was limited to 2.5A:
http://www.e-cigarette-forum.com/fo...gelei-zmax-v5-doesnt-gives-me-even-close.html

As far as I know the VTR only have room to 1 18650 but Innokin specs (iTaste VTR - Best Electronic Cigarette | E Cigarette Manufacturer|Best Vape MOD| Innokin) says 5A.
Is there anything else that I need to consider, or does it really provide 5A in any situation?

2. The lowest resistance doesn't listed anywhere, can it fire 1.0ohm? more? less?

3. Whats the diameter limitation for the tank I can use without adapter/extension?


And unrelated question, does "High Drain" in batteries related to the amp limit? if so, 10A considered as high?...

Again, if you have anything else to add about this device, I'll be happy to hear.
Thanks!

 

[akpostal]

I have 1 clearenced to fit the 30b, 2 with the ring cut off to fit Russian 91%, and 1 unmolested.

Only thing I can answer is I have had all of mine fire a .8ohm coil.

 

[VapinSweetZ]

0.8 is impressive, but that's kinda disappointing:

ring cut off to fit Russian 91%

I hoped to use it with KFL+ without the adapter...

 

[Ease]

Yep fires .8 every time. 19mm or smaller atomizers fit in the ring. Kayfun mini or taifun gs could be your ticket.

 

[Hermit]

I can't see where it says 5A on that page, not directly anyway

Best to think in terms of watts for a VV device - it's limited to 15W, so that's going to be close to 5A from the battery when the battery gets very low (I reckon about 3.33V allowing for 10% losses in the circuitry).

And with a 0.8 ohm coil, the maximum voltage it should output is sqrt(15*0.8) = 3.46V, regardless of whether you set a higher voltage. In theory it could fire a 0.6 ohm coil, but only at 3.0V.

With VV/VW, is there really any point to chasing low ohms? You aren't going to get more than 15W into the coil(s) with a VTR...

 

[Ease]

I can't see where it says 5A on that page, not directly anyway

Best to think in terms of watts for a VV device - it's limited to 15W, so that's going to be close to 5A from the battery when the battery gets very low (I reckon about 3.33V allowing for 10% losses in the circuitry).

And with a 0.8 ohm coil, the maximum voltage it should output is sqrt(15*0.8) = 3.46V, regardless of whether you set a higher voltage. In theory it could fire a 0.6 ohm coil, but only at 3.0V.

With VV/VW, is there really any point to chasing low ohms? You aren't going to get more than 15W into the coil(s) with a VTR...

Imo theres no point to subohming the vtr, I get much better performance from a 1.9-2.1 ohm coil. Might be different if I had a vv/vw device like a dna30 though for instance.

 

[serenity21899]

3. 19mm or less. ProTank2 and iClear 30s both work. IBTanked 19mm xl carto tank works, as well. I have heard, but not tired, the Kayfun mini also fits.

 

[Hermit]

Imo theres no point to subohming the vtr, I get much better performance from a 1.9-2.1 ohm coil. Might be different if I had a vv/vw device like a dna30 though for instance.

Yeah. At 1.5 to 2 ohms you get more choice in turning it up or down, rather than being stuck at one end of the range. I'm not sure what the voltage range of the DNA30 is, but a smilar thing would apply I think (with maybe a different sweet spot for the ohms).

edit: there must be a calc for highest sweet ohms... thinking...

edit2: max volts squared / max watts = max ohms that still allows max watts
so for the VTR... 6 * 6 / 15 = 2.4 ohms

 

[Brant Stephenson]

I have used my vtr as low as .6 ohms, it performed very well. And contrary to what is stated above the vtr can put out up to 20watts with its 5 amp limit. You just have to put it in vv mode instead of vw.

Sent from my Motorola RAZR MAXX using Tapatalk

 

[Ease]

I have used my vtr as low as .6 ohms, it performed very well. And contrary to what is stated above the vtr can put out up to 20watts with its 5 amp limit. You just have to put it in vv mode instead of vw.

Sent from my Motorola RAZR MAXX using Tapatalk

Watch Phil Busardo's review where he puts it thru its paces. The chip limits it.

 

[Hermit]

Me, I'm just going by the specs to produce my numbers.

PBusardo VTR review, @ time where limits are tested.

It stays within the 15W limit at all the points he tests.

There could be certain circumstances that evade the voltage or wattage limits, I suppose. But personally, I'd prefer that both the advertised capabilities AND limits were correct!

 

[Brant Stephenson]

Ohms law calculator to demonstrate 20watts within the 5 amp limit

Sent from my Motorola RAZR MAXX using Tapatalk

 

[Ease]

Thats based on theory and does not take into account the limitations of the chip.

 

[Hermit]

Well, that's dandy math, but there appears to be a watt limit as well, or more likely only a watt limit. Just look at the 1 ohm @ 4 volts setting part of the video - the VTR only drives it at 3.8V.

 

[Brant Stephenson]

He does not test it below 1ohm. I cannot say anything for the consistency when pushing it that hard however. There was a lot of great info in that video, I had always avoided pbusardo because of the length of his videos but that was great

Sent from my Motorola RAZR MAXX using Tapatalk

 

[Hermit]

He certainly earns his views, putting together stuff like that! It doesn't really matter that he didn't go below 1 ohm, because 4V / 1ohm would only be 4A - something else must be limiting it. 3.8² / 1 = 14.44W, close enough to 15W (allowing for some imprecision in coil and voltage etc).

 

[Ease]

Despite the limitations its still a great mod. Rock solid and easy to use. I bet when the dna clones take over the states, vtrs will be available sub-50$.