Re: hfs4 and megasquirt
 

I can see the problem here. The Grey harness is not designed to receive "peak and hold" signals.

I suggest you do the following:

1. Disconnect the green wire of the grey harness.
2. Connect the red and green wire of the green harness across the fuel injector.

Re: hfs4 and megasquirt
 

thank you will order green harness now will let you know how i make out

Re: hfs4 and megasquirt
 

The green harness should come with the kit.

Re: hfs4 and megasquirt
 

i bought this 2nd hand and did not get the green harness.

what other things should i be wiring in order to fully utilize the functions of the HFS4.

i have
map signal in the works it will be added once i get a mod for my ECU done
INJ duty input
fail safe by taping boost controller solenoid

are there more variables i could and should add to make it better.

i will be doing direct port most likely if i get the results i expect from adding meth.

i am also starting with a 50/50 mix and see how it likes it. as of now the car makes 490 @21 psi. i am hoping with the extra octian and cooling to get closer to 600whp and 30psi but that later after this is working on <17 psi

Re: hfs4 and megasquirt
 

Got the green harness in and wired. I know am getting trigger. But I also am getting what seems like noise and random trigger. Just driving regular it will all of a sudden. Show flow for I few sec then go off