vmax...3rd post...

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rotohammer

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That's what you have us for. You have a good setup, but I'll admit I bought a huge array of atomizers looking for the perfect vape. With a little fiddling with some cotton I can take what I thought was junk and turn it into gold. The Vmax is a great unit and the expense is behind you. Try a higher ohm atomizer and you'll be happy.
 

AndyInOC

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It can be super challenging for sure. So far my vmax loves the boge lr cartos I've been using (have some sr on the way though) and most of them meter around 2.2ohm then i put a ce3 bottom coil on it that meters 2.8ohm and it doesn't like that at all even at 3v. So then i tried a stardust on it that metered about 2.6ohm and it was loving that too, and i cranked it up to 4 or 4.1v. Overall just for ease of use i will be sticking with my carto tank setups on the vmax & using the ce3 on my twist like usual.
 

badinfluence357

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Im totally angry at myself for listening to all the hype bs about this vmax ....vwack is what they should call it!! After just 2 weeks of use this new ss vmax started smoking from inside the unit while I had it to my face vaping it with my morning cofee......I was terrified thinking the s#!t could have blown up in my mouth like that other guy....smh!

sent from outer space using my vaperbotron 5G speed of vape!
 

Stonemull

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not sure how you came to the conclusion the vmax is correct.
i just meaured open circuit voltage 3.0 out at 4.5v rms, 4.2 under load .. so its not only wrong, it also doesn't regulate very well.
since i rarely go over 4.3 or so, there is no setting i can adjust the vmax to so i can even use it.

conclusion: waste of money.
 

cozzicon

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not sure how you came to the conclusion the vmax is correct.
i just meaured open circuit voltage 3.0 out at 4.5v rms, 4.2 under load .. so its not only wrong, it also doesn't regulate very well.
since i rarely go over 4.3 or so, there is no setting i can adjust the vmax to so i can even use it.

conclusion: waste of money.

I agree. I've had the Provari, Buzz Pro, Lavatube, and V-max disassembled. Not only were the electronics unidentifiable and very cheesy on the Vmax, but the unit fell apart after a single drop (which is why the unit was taken apart).

I'm not ragging on the mod because it's Chinese. There's no axe to grind here.

It's just if you look at those units disassembled you note that even on the Lavatube (another Chinese mod) that they use a decent TI regulator. Just saying.

Any PV with a 200 page "tips and tricks" thread should tip consumers off to a possible problem. If you need 200 pages to talk about how the thing works... it's probably iffy.

That's just my take- and it's a somewhat unpopular one with the Vmax crowd. But I'm a big boy :)
 

Stonemull

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its just watts and more watts RC.
nothing wrong with watts if thats what you want, the genesis attys you like can cope easily with them and thats where I wlll have to head with the vmax.
the issue here is not even that its indicated voltage is incorrect ..
its simply that I can NOT turn the unit down far enough to run an ego C on it for example. there is no way to do it..
 

rotohammer

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not sure how you came to the conclusion the vmax is correct.

Thats why I included a picture of my meter. Mine regulates perfectly, I don't feel like I wasted my money. I just got mine though, so perhaps its a newer revision. I have two more Vmax units on their way in. I'll test them and see if theres any consistency.
 

rotohammer

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Vmax V4 Update: I believe I have a version 4 since it has the larger top cap gap that can accomodate a stardust clearomizer.

Update2: No, I was corrected, it is a V3.

First tests show that its output is different from my V2 unit. The output swings more negative than my V2 , the ratio of which changes with the voltage setting, the higher the voltage set the more negative the output swings. That makes my AC RMS readings actually go lower as I turn up the Vmax voltage. All the while the pulse width is varying duty cycle at a somewhat contant frequency. Tricky.

In actual use it feels the same as the V2 unit, lots of power. I popped my 2 ohm test coil at 5v. It couldn't take the heat.

Cosmetically it has a different finish, more of a polished stainless steel than the chome look of the V3. It also has different engraving, machine made instead of stamped, much sharper looking.

I'm not done testing though, I need to get a handle on how to measure these units properly.

Update: Further testing shows both units are swinging negative similarly, I can't figure why today, just is what it is.
 
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AnsonJames

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its just watts and more watts RC.
nothing wrong with watts if thats what you want, the genesis attys you like can cope easily with them and thats where I wlll have to head with the vmax.
the issue here is not even that its indicated voltage is incorrect ..
its simply that I can NOT turn the unit down far enough to run an ego C on it for example. there is no way to do it..

I picked up a Chinese "Bulli" clone today and even at 3 volts/1.9 ohms it just burns on the Vmax.
What's the point in the Vmax being able to handle 5amps if you can't use LR with it?

It's like owning a really fast car without brakes.

The Vmax is a good device but it completely lacks finesse of any sort.
 

DaveP

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I don't have access to a scope anymore, but it puzzles me why my Provari with an inline DVM between the source and the atomizer reads accurately, but an eGo just flashes. It must be pulse frequency differences or possibly that the Provari has a capacitor or an RC network across the output to level the pulses. If that were the case you wouldn't see the transitions to zero in the pulse train. You'd see more of an average voltage with a ragged waveform, depending on the value of the cap.
 

VapingTurtle

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... It must be pulse frequency differences or possibly that the Provari has a capacitor or an RC network across the output to level the pulses. If that were the case you wouldn't see the transitions to zero in the pulse train. You'd see more of an average voltage with a ragged waveform, depending on the value of the cap.

That is exactly the case. It is called a filtered PWM.
 
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