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By DanGT4
Just to give some input to this problem. The required duty cycle will be dependant on the position of the idle screw in the throttle body. Somewhere between 60-90% DC is a usual band on the stock NB engine. This one:
(credit: www.miata.net)

I've been experimenting and it doesn't seem to make any noticeable difference what the particular required DC is. I've played around with my idle screw a bit and right now the valve moves from 30 to 15% DC during warmup when running open loop.

Valve frequency should be 120Hz
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