LowZ extension 8 channel

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$65.00
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Automatic flyback board for LowZ (low impedance) injectors.
Although this supports injector PWM-ing on 8 channels (so any injector output can be used), when using only 4 channels (to stay compatible with the 4-channel version), please use these 4 channels: inj-A,B,C,D (1,2,3,4): EC36/7, EC36/19, EC36/8, EC36/20 respectively.
Genboard v3.x supports injector PWM-ing:

After about 1msec of full (14V) drive, PWM-ing (35..50% duty is most common) is the coolest method for driving low-impedance injectors (results in less heat in injector drivers).
This automatic flyback board provides the required low voltage flyback while PWM-ing is active, and high voltage flyback to make injectors turn off faster after PWM-ing is over (for the best of both worlds). Effectively, instead of low-voltage flyback all the time this results in faster injector switchoff and therefore more predictable fuel-delivery between cycles and between different injectors (different injectors have slightly different closing characteristics, even from the very same manufacturing batch - even if measured+grouped, injector closing characteristics changes a bit during operation).
If PWM-ing is not required, the default 30V "high voltage flyback" is a cheaper solution with same effect (but than PWM-ing must be disabled to avoid damage).

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