thank you for the reply yeah does match up on steam engine. But I didn't think the ohms needed to be at .15 for tc. Hadn't read either way anywhere saying it couldn't be more but like I said I'm a newby and Just learning everything. Who knows maybe tc does have to be .15 won't hurt to try. I did make another set of coils and spaced these .30 on ohms this time and did same thing. Did check ramp up on both coils and were almost identical. Used a screw as the wrap base this time cool trick learned on a tutorial. Liked the .15 tc coils but was just trying different things. Put my crown on it with a crown .15 tc coil and it worked fine but this was the ni200 coils don't have any ss ones.
different metals have different characteristics in relation to heat and resistance.
stainless steel has a lower change in resistance per mass. so it takes more mass for the change to be high enough to accurately regulate.
also, ni200 is almost non resistive hence it is a type of NR. it works so well in tc because it has a huge difference in resistance from cool to hot. where as SS does not have a huge difference making it more difficult to regulate properly. ive noticed between yihi and dna boards, that I get better results between 0.2 and 0.25. That is by no means anything set, just a trend that ive noticed.
In fact just last week I had a build that came in at 0.17 ohms and because it was such a low resistance and dual coil. it was difficult to ascertain the difference in resisitance.
I'm sorry if this rambles
but 0.17 at rest, may only climb to 0.21+- whereas 0.22 will probably climb to around 0.29. I'm making the numbers up, but hopefully that will make more sense.