Steam engine for DNA200 profiles

[myvapery]

Bought myself the HCigar DNA200 and I'm in love! Temperature control finally 'makes sense', in that the vape is far superior and far more 'tweakable' into your sweet spot than Kanthal. Before this I only had the eVic VT and the difference is niht and day. I've got a dual Ti build in the velocity (12 wraps, 24ga, 3.5mm ID) that barely got warm on the eVic. A one second 200w pre-heat followed by 100w for 200c and my jaw is on the floor at how good this is! The response is instant, the flavour incredible and the temperature just where I want it. Here's a pic of my new baby with the Zephyrus on:



Anyway, my main question is with Steam Engine profiles... I'm a little confused. So on the 'coil wrapping' tab, you can specify single coil, dual coil etc and look at what this does for resistance. There's no similar option in the wire wizard. You can specify single, parallel or clapton, but you can't specify single, dual, triple or whatever. Is this an oversight? Or is the resistance differential in a single coil setup the same when you increase the number of coils?

Cheers

 

[danb]

is the resistance differential in a single coil setup the same when you increase the number of coils?

Resistance factor depends only on the TCR, it doesn't matter how many wraps or wires you have. Is that what you mean?

 

[myvapery]

Resistance factor depends only on the TCR, it doesn't matter how many wraps or wires you have. Is that what you mean?

I'm not sure! Lol. Obviously wraps and ID matter or steam engine wouldn't have it in the tool. I suppose I'm asking if TCR remains the same regardless of the number of individual coils in a build, so long as they're not running parallel?

 

[danb]

I suppose I'm asking if TCR remains the same regardless of the number of individual coils in a build, so long as they're not running parallel?

TCR is a property of the material, it is independent of wire length (wraps), gauge, or whether you have dual, quad, etc. etc.

Resistance factor is also independent of all these things.

 

[myvapery]

TCR is a property of the material, it is independent of wire length (wraps), gauge, or whether you have dual, quad, etc. etc.

Resistance factor is also independent of all these things.

Thanks. I'm just struggling to work out why despite using the tool correctly, I'm having to set different temperatures in different attys to get similar results, depending on the type of wire I'm using. They're all similar, in that they have plenty of airflow and small decks. The Zephyrus is a stock Ni200 coil, 0.15 ohms. If I run that at anything more than 160c it tastes burnt. The aromamizer is dual vertical built to 0.15 ohms with Ti, set to 180f. The Vortice is single Ti vertical coiled, but I'm having to run it at 200.

Wasn't sure whether it was something I was doing wrong.

 

[danb]

I'm having to set different temperatures in different attys to get similar results, depending on the type of wire I'm using. They're all similar, in that they have plenty of airflow and small decks. The Zephyrus is a stock Ni200 coil, 0.15 ohms. If I run that at anything more than 160c it tastes burnt. The aromamizer is dual vertical built to 0.15 ohms with Ti, set to 180f. The Vortice is single Ti vertical coiled, but I'm having to run it at 200.

Wasn't sure whether it was something I was doing wrong.

You have to change the TCR profile when you switch between wires made of different materials (it is not clear what you mean by "type of wire") to get similar performance at the same setting. Ni and Ti will require different settings if you use them in the same mode.

Assuming you are set up correctly for Ni, 160 ^oC sounds too low. Low resistance builds are very sensitive to static resistance caused by imperfect contacts. If you have a dodgy contact somewhere, the device will underestimate temperature (i.e. you'll find it gets hotter than expected). It might be worth checking everything's screwed in properly. Some tanks will be more prone to this than others, which may explain why you see some variation. Also make sure you calibrate at room temperature - calibrating above room temperature will lead to a similar situation where the device underestimates the temperature.

You say your Ti build goes at "180f", do you mean ^oC? 180 ^oC is usually about where things start to get moving, so that's probably not something to worry about, and running the other Ti build around 200 (I guess ^oC) is pretty close. Differences in small static resistances could account for this difference - when your comparing different tanks you should expect ballpark area, not surgical precision.

Building at higher resistance will reduce the effect of any static resistance contribution, and also allow your device to measure resistance changes (i.e. temperature changes) more accurately. On a 0.15 Ohm Ti build, the difference between 180 and 200 ^oC is only about 0.01 Ohm. With the different contacts, slight variations in calibration temperature, and a myriad of other small differences between different tanks, coupled with the limits of how accurately the chip can actually measure resistance, it is probably unreasonable to expect to vape everything at exactly the same setting.