better use rba... my whole tank if chain-vape take longer to finish..
using ss coil firing around 32.5w, 0.3+ ohm, temp around 350 to 420f..

dont know about the airflow cause only using rba... i guess same like pre-built coil..
for my setiing,
5 wrap ss316 on 3mm diameter, fire 32.5w on 0.36ohm and 420f. with my vt40
awesome vapor(not hot) medium big cloud and pretty sweet2 taste on strawberry pie juice..

edited:space coil

Hi lyn. I'm planning to start an ejuice company very soon and I'd love to hear your feedback. I have 4 flavor profiles in the making.  They have all been carefully crafted and the ingredients are sourced overseas. Here is the flavor profile:

Banana Cream With Strawberry (banana cream with strawberries and some other fruits)
Honeydew Condensed Milk (refreshing honeydew laced with sweet condensed milk)
Mango Sticky Rice (glutinious rice, sweet mangoes and condensed milk)
Peanut Butter and Banana with menthol (sounds weird, i know but its bloody tasty)
Out of all these flavors, which one tickles your fancy? PM me or reply on this comment. I'll be having a giveaway soon so anyone who helps will definitely get a bottle.

Vertical coil


Greatly improves the airflow and even the flavours itself

http://www.lelong.com.my/diy-mod-parts-ham...6-10-Sale-P.htm

More choices at www.fasttech.com

Actually, if u add up the cost of a mod box, button, 510 connection, battery sled, shipping and the time and effort to make it....
maybe it would be good for u to consider a Joyetech Cuboid mod...it has smaller dimensions than an IPV4s (I own one and know how bulky it can be). Look out for sales in places like Shopee. I'm waiting for further price cuts!