The stock coils are good coils but they're not a better coil. Certainly not when used with the stock ignitors. There are piston guys making well over 300 hp PER HOLE on these coils running full methanol and enough boost to make you blush. There is nothing wrong with the coil.

 

IMO the stock ignition stuff is bad azz. The four trailing coils and four leading ignitors are doing there job for me to run 152mph in the 1/4 mile. And you can't beat the price. Plug gap is .025 dwell is 3.5
No misfire at afrs in the high 10s. Afr is usually in the mid 11s but there have been a few times the water temp went to 186f, where the correction adds 5% more fuel and it runs the same times.

 

im not an expert, this is just a theory.. i believe spark blowout is big problem on rotaries, especially with long combustion chamber. people experience ignition breakup and think they need a hotter coil like the IGN-1A or use an ignition amp or CDI. But the problem is not inability to initiate the spark, but instead the ability to maintain the spark once it has started (coil energy capacity)

i do not think mazda engineers were fooling around when they designed the factory coils.. of all the coils i have tested, FC coils have the most inductance and energy storage capacity, which generates long spark duration (almost twice the duration of any coil i have tested). If/when the spark blows out, the factory coils still have enough energy in them to restart the spark, where hotter coils like the IGN-1A cannot