vmax...3rd post...

[hmlessalky]

The thing that is kinda funny is that the Vmax is actually capable of providing the power to really drive those dual coils. I agree that you should try a single coil setup and you will be pleased. Dual coils were designed originally to simulate a higher voltage vape on a lower voltage device. They worked great on my eGos, great enough to finally get me to give up the cigarettes almost for good (still have one every once in a while - alcohol!).

 

[Jbaumer]

from what Ive read, there is some nice stuff online.

if you want more in ohm control or volts or what ever, then build it.

I am still reading on this and will wait a cpl more months and see how semi-long term goes.

This seems like an awsome system though. It is in consideration since it seems great for those who need a real smoke break.

 

[pokerplaya]

Does anyone know which vendors are selling the version 2 Vmax? I have looked at several different sites and nobody lists in the description if its the version 1, or version 2 that they are selling.

 

[rotohammer]

Does anyone know which vendors are selling the version 2 Vmax? I have looked at several different sites and nobody lists in the description if its the version 1, or version 2 that they are selling.

I just got mine this week from vaporstation.com. It starts at 3v so its at least a version 2. I've measured the voltage output from 3 to 6v using my Fluke meter and its within 0.1v through the whole range.

But, measuring open circuit doesn't tell the whole story. I'll setup a test jig so I can compare the voltage out under load between the Vmax and my Ego-T, XL3, and thin 510 batteries. My hunch is that with its high output current rating, the Vmax voltage doesn't lag down under load, but instead delivers a solid voltage at its rated output, hence the feeling of more power beling delivered to the coil, because there really is!

Im using Vision V3 clearomizers (2.8ohm) rewicked with cotton with the Vmax at 3.6v and its insanely enjoyable.

 

[becosemsaida]

Well i have my V2 since yesterday.... Everything i use under 2.0 Ohm is a waist of time. Burned flavour, even at the lowest voltage. So i use clearos that are around 2.4 Ohm and even on the lowest setting they are very strong and if i'm not carefull burned taste come right in. As i can see it should work very well on 3 Ohm carts/clearos/tanks etc. etc.

I tried a 1.5 Ohm....... Just forget it !!!

Still learning but i really like this so far.

Just an extra: i have a vivi nova v1 and i really can't find a way to make this work on the Vmax... i have the 2.8 Ohm on it but still get that burned taste after the second hit.


beco

 

[Flyer]

Something odd is going on. The whole point of VV is to be able to dial a PV in for different resistance values and personal tastes. A device can't force extra current through a given resistance unless it increases the voltage (ohms law). So, if the output voltage is accurate, why is it that almost everyone is saying that low resistance (1.5 - 2.0) ohms can't be used on the Vmax at even 3 volts without giving an indication of overpowering (burnt taste)?

 

[rotohammer]

why is it that almost everyone is saying that low resistance (1.5 - 2.0) ohms can't be used on the Vmax at even 3 volts without giving an indication of overpowering (burnt taste)?

power=volts x amps

If the voltage drops under load on one device but stays correct on another, the latter will deliver more power to the coil. I haven't measured this yet, but I will in one hour.

 

[Flyer]

Provari V2 has been tested and proven to deliver (and hold) a set voltage and can be dialed in for almost any resistance without giving burnt taste. Looking forward to your results. Hopefully they will shed some light on this.

 

[becosemsaida]

Something odd is going on. The whole point of VV is to be able to dial a PV in for different resistance values and personal tastes. A device can't force extra current through a given resistance unless it increases the voltage (ohms law). So, if the output voltage is accurate, why is it that almost everyone is saying that low resistance (1.5 - 2.0) ohms can't be used on the Vmax at even 3 volts without giving an indication of overpowering (burnt taste)?

I think it's because the pwm.. I have a ego twist and can vape at 3.7V no burning taste or other problems. With this device it delivers the full voltage for starters. I read here that it's kind of an on/off procedure where the outcome (set voltage) is only the average of those steps. Basicly it's like this: punch the knob: 8V then goes to zero average voltage in those 2 steps is 4V....... Now can we domain this in order to use it, yes just adjust your device 0,5 LESS then you would on any other vv. Just one problem we can't go under 3V. So a resistance of 1,5-2,0 Ohm should be vaped at 2,5V. Hope you can get the picture.

I saw the vid from PBusardo fot he V1 and got my info from there and other sites with PWM devices. I think they should have adjusted it better with the V2 (or V3) version so that you get a lower voltage then described or measured.

Still love my device, just need to adjust the accesories

beco

 

[rotohammer]

My test proved my hunch was totally wrong:

Since my Fluke is also an oscilloscope, the wave forms that I see paint a new picture.

All devices set to 3.8 volts (same as the fixed volt 510 battery):
2.0 ohm coil cartomizer as the load.

[FONT=Courier New]UNIT          Avg Volts        Freq Out
510battery    3.40v          89Hz steady
VV 900mah     3.45v           2Hz steady
XL3 3100mah   3.35v           8Hz changing to DC in 3 seconds
Vmax          2.74v         980Hz steady
[/FONT]

I need to study the waveforms closer to understand how the power is delivered.

Without a doubt, the Vmax is a very different device compared to my conventional batteries.

 

[Flyer]

Were the duty cycles all 50%? Just curious

 

[rotohammer]

Were the duty cycles all 50%? Just curious

Nope, all but the vmax were aprox 85% on 15% off. I will post some pictures of the waveforms after my batteries charge up. The Vmax waveform was hard to read as I didn't have the freqency range set high enough, so it looked like a big black bar of transitions from 0 to 7 volts

 

[rotohammer]

Just an extra: i have a vivi nova v1 and i really can't find a way to make this work on the Vmax... i have the 2.8 Ohm on it but still get that burned taste after the second hit.
beco

Since the Vivi Nova is similar to the Vision V3 you may want to consider a cotton wick. I haven't got a burnt hit with my Vmax yet with cotton.

I start with #1/0 cotton candle wick and separate it into individual threads. I then twist 15 threads together and thread it into an existing coil and then let them fan out and dangle off each side. I place another bundle of 15 threads under the coil. A loose bundle of cotton thread keeps the liquid from dissipating completely when heated. A tight wick dries out under the coil easily.

 

[becosemsaida]

Nope, all but the vmax were aprox 85% on 15% off. I will post some pictures of the waveforms after my batteries charge up. The Vmax waveform was hard to read as I didn't have the freqency range set high enough, so it looked like a big black bar of transitions from 0 to 7 volts

I read somewhere that it goes up untill 8,1V, maybe set it at 10V will give you a clear read-out...

 

[martinc]

You need at least 2.6 ohms atties on that beast...2.8 or even 3 ohms and enjoy bliss.

Join us,dedicated thread and several owners are there to help ya. http://www.e-cigarette-forum.com/fo...-smoktech-vmax-owners-tips-tricks-quirks.html

 

[becosemsaida]

You need at least 2.6 ohms atties on that beast...2.8 or even 3 ohms and enjoy bliss.

Join us,dedicated thread and several owners are there to help ya. http://www.e-cigarette-forum.com/fo...-smoktech-vmax-owners-tips-tricks-quirks.html

233 pages and counting.... I came to page 80 and then just got tired. Still a lot of info about this device..

I saw a "Vmax club" where you have to be "invited" to it that still working?? How can i join??

Thanks

beco

 

[martinc]

The dude that started the club has a "moved on" status

 

[rotohammer]

My previous voltage measurements on the Vmax were with almost exhausted batteries. With fresh batteries the open circuit voltage measurement is much higher. 3.8v on the Vmax measured 4.5v on my Fluke meter.

Now, I realize that open circuit measurements on a pwm device like the Vmax is meaningless.

Edit: Correction #2, first measurements were on AC, which is correct for this device.

Vmax set to 3.1v with open circuit voltage measured at 3.8v .
Resulting voltage measured under load: 2.5v 37% duty cycle.



Bottom line: It's a powerful unit. The voltage adjustments should have been replaced with a 1-10 scale since it doesnt correlate with any measurement setup I can think of. They should just change the software to go down to 2 volts on the next revision.

Update: Had to set the meter to AC measurement, duh. 3.1v on the Vmax equals 3.2v measured.
But, its 3.2 open circuit AND with a 2 ohm load across it, Sweet! Now to retest the inferior units.

510 battery    0.7v with 2 ohm load!
Other units: No significant AC component

Conclusion: Only the Vmax can deliver its stated voltage EVEN UNDER LOAD! This actually proves my original hunch. Hence, even at low voltage settings, you're really getting the stated voltage to the coil, unlike the other units that drop by .5 volts or more depending on how you measure.

View of Vmax under load, AC RMS measurement:

Can you say "Kicks ...!"

I just ordered a second Vmax just in case they become a rare commodity.

My suggestion:

 

[Flyer]

Your findings explain a lot of what we hear here. Thanks!

 

[rotohammer]

Your findings explain a lot of what we hear here. Thanks!

Now I understand why there was so much discussion/confusion about the Vmax output voltage measurements with regard to output power. They were all doing it wrong. This is the kind performance I would want from my device. Match your atomizer to it and enjoy!