IDC sensing HSF-3

[kellygnsd]

I have a HSF-3 system that I'm wiring into my STi. I'm running a Link G4 standalone ECU and I think the fule injector carrier frequency is different than stock. Currently I'm tapped into on of the injectors with the inj- lead but with the threshold pot fully anti-clockwise meth injection starts at like 1.5% IDC. I thought it wasn't supposed to trigger until 12% at the minimum setting.

I would like to use a PWM table in my ECU to control meth flow but I need to know how to wire that into my Link. Do you have any circuit diagrams of the inj+ and inj- wiring. What is the difference between inj+ and inj- and if I only have a low side PWM drive, how do I wire the Link so I can use custom flow tables based in the ECU. Thanks again.