Yes,
Steam Engine is a wonderful source of information for building coils. Like 93gc40 said, plug in the values you have been using with your single coil builds -- wire gauge, resistance, coil diameter, and the wattage you vape at (on the rightmost column where it says "Heat flux @ 10 W", change the 10 watts to whatever you usually vape at with that single coil build). Take a note of the heat flux value -- most likely it will be between 150 - 250 mW/mm^2, but could be much lower or much higher if you like a very cool or a very hot vape, 200 mW/mm^2 is sort of a middle ground.
Then back on the left column, under "Setup", change "Single coil" to "Dual coil" and don't change anything else. Take another look at the heat flux value, and it should be 1/4 of what it was with the single coil build.
Next, drop the resistance (back over to the left column) down and/or increase the wattage setting (right column under "Heat flux") until you reach your target heat flux value (the value you saw when you entered in the information for your single coil build). After you've matched the heat flux value, the right column will tell you how many wraps you need for each coil.
Example:
- You were building a 1 ohm coil with 26 gauge wire, 9/8 wrap @ 2.5 mm, and vaping at 23 watts.
- Plugging all those values in, you find that your preferred heat flux is 204 mW/mm^2.
- After switching "Single coil" to "Dual coil" without touching anything else, the new heat flux is 51 mW/mm^2 (1/4th of what it was).
- You decide that you want to use the same number of wraps for the dual coil build as your old single coil build, so you cut the resistance setting in half to 0.5 ohms. The number of wraps in the right column should now be at 9/8 wraps.
- Next, take a look at the heat flux value. It's at 102 mW/mm^2, so you increase the wattage setting until you get the heat flux back up to 204 mw/mm^2. In this case, it is 46 watts.
So for a dual coil build using the same wraps and coil diameter as one of your preferred single-coil builds, you'll end up at half the resistance, and will need to double the wattage on your mod to get a similarly hot or cool vape as what you're used to.
But don't just always go the route of using the exact same build but in dual coil, then doubling your mod's wattage. Experiment with increasing the wattage more than what you are decreasing the resistance, and also the reverse (decreasing the resistance more than what you are increasing the wattage). Most people don't stray too far from their desired heat flux -- some people like a cooler vape, while others prefer a warm or hot vape, and most like to keep it that way regardless of what they build -- but there are many,
many ways to reach your desired heat flux.
For example, even if you stick with 26 gauge dual coil builds with a 2.5 mm diameter, you have lots of options. All of these builds have a similar heat flux than in the example above.
- 13/12 wrap, 0.75 ohms, vaped at 70 watts
- 11/10 wrap, 0.65 ohms, vaped at 60 watts
- 7/6 wrap, 0.4 ohms, vaped at 37 watts
- 6/5 wrap, 0.35 ohms, vaped at 32 watts
- 5/4 wrap, 0.3 ohms, vaped at 28 watts
