PDA

View Full Version : IDC sensing HSF-3


kellygnsd
21-01-2014, 12:39 AM
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.

Richard L
22-01-2014, 08:27 AM
Just wire the green wire of the grey harness to the LINK 's low switch output, that is all. Use ~50Hz to 80Hz region for the PWM. Red wire remains the same location as before.

kellygnsd
22-01-2014, 03:25 PM
Thanks again Richard.

kellygnsd
08-04-2014, 04:36 AM
Richard,

I have fairly large injectors, around 1200cc/min but as stated above I'm driving the HSF-3 controller via an aux output instead of from the actual fuel injector signal. Should I still solder a bridge on the 1.5x gain pad and break the 1.0x bridge or will the 1.0x gain be sufficient?

It seemed like when I tested the system I wasn't able to get below 4 bars on the flow sensor with injection triggering at about 7.5%. Is that about right with the .9 and .8 nozzle installed?

Richard L
16-04-2014, 12:44 AM
It all depends on how much of 1200cc injector is used. If you are using the full 4800cc/min, then you don't need to alter the pre-amp gain to x1.5.

But if you are only using up to 60-70%, then do make the x1.5 gain.

I await for your answer first so I can answer the second question.

kellygnsd
18-04-2014, 05:32 AM
I will probably use 80 - 85% of the available IDC.

Richard L
18-04-2014, 08:53 AM
That is a great deal of power for a sti? Or you are running E85?