BRZ fuel pump wiring question

[solidsnake11]

If you want it to come on with ignition use the red wire on controller to trigger relays. First relay trigger would go red to ground 2nd relay trigger would go red to motec. This will bypass the controller. Sorry I was outside today and didn't get it all read very well.

[ft86xtc]

Checked KOEO 12v while priming then drops to 5v. Car currently won't idle till I get it tuned otherwise I would have checked it with the car running. I'm using the radium dual hanger with two walbros, only one is hooked up. Plan on having.the other one come on with boost. I'm not good with Motec yet so I'll have the tuner figure out that part of things. A30 looks to be a peak hold injector, could you use half bridge output instead? What are you using for reference, map, rpm???

[Clash0901]

Originally Posted by solidsnake11

If you want it to come on with ignition use the red wire on controller to trigger relays. First relay trigger would go red to ground 2nd relay trigger would go red to motec. This will bypass the controller. Sorry I was outside today and didn't get it all read very well.

My issue is now resolved. It was a setting within the motec and not related to my wiring at all. I appreciate your insight and help! I did not want to bypass the fuel controller so I can retain the priming feature.

Originally Posted by ft86xtc

Checked KOEO 12v while priming then drops to 5v. Car currently won't idle till I get it tuned otherwise I would have checked it with the car running. I'm using the radium dual hanger with two walbros, only one is hooked up. Plan on having.the other one come on with boost. I'm not good with Motec yet so I'll have the tuner figure out that part of things. A30 looks to be a peak hold injector, could you use half bridge output instead? What are you using for reference, map, rpm???

The drop to 5v is normal. The factory relay is PWM and will demand more voltage as it see's fit. You will need to run 2 separate relays (I bought the 2x radium DIY fuel pump wiring kits). Use my diagram on page 1 and you will be operating perfectly. I would not bypass the fuel controller, as it has factory features that would disappear such as fuel pump priming. The way I have it wired the PWM will demand higher voltage but it won't matter since all that "5v" in this case is doing is opening up my relays which both, individually, send 12v+ to the fuel pumps.

I am referencing injector duty/cc to trigger my second pump via pin A30 which is, as you said, a peak hold injector #8 and not utilized on a 6 cylinder. All it's doing is grounding out the circuit which is the 5v coming from the factory "green" wire by your fuel pump area. If you need help with any of this, wiring, or on the motec side please shoot me a private message and I will guide you through it. Now that I know it well, I'm not shy to provide assistance!