Josh Burt Posted December 7, 2011 Report Share Posted December 7, 2011 I just installed a WRX fuel pump controller in my vehicle to control an Aeromotive 340lph pump as the pump was overpowering my fpr at full flow during idle. Â So far this setup is working as expected except for one thing. Â After my startups the Link ECU is commanding the fuel pump controller to run the pump at full speed for about 30sec. Then it responds normally. Is this on purpose? Is there a way to disable that? Â Thanks Quote Link to comment Share on other sites More sharing options...
lemmy01 Posted December 12, 2011 Report Share Posted December 12, 2011 There is a setting for 'prime time' on the fuel-pump(not Fp-Speed) output. Perhaps it help. Quote Link to comment Share on other sites More sharing options...
Felix Kreysig Posted December 12, 2011 Report Share Posted December 12, 2011 The prime time is only of interest after turning ignition to 'on', At that point the pump starts running to build up fuel pressure in the rail. Have you used the Subaru V 7-9 basemaps? If so I guess during start your injectors are running with duty cycles above the preset switching point. After start up enrichment has faded away they drop below and fuel pump goes to 'low' mode. You could try adjust the switching point to higher cycles to get rid of that issue. Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted December 13, 2011 Report Share Posted December 13, 2011 Hi Josh. Felix is right on man. Take the switching point well out of the way of the highest inj DC you see at startup to test this (eg 50% or higher). This will prove the point quick smart and you know what you're dealing with. Then I suppose chose your switch point from there once the issue is confirmed. Jurgen Quote Link to comment Share on other sites More sharing options...
Dtech Motorsport Posted December 13, 2011 Report Share Posted December 13, 2011 If my memory serves me correct the start up 100%dc is locked in software for that controller as that is what the factory ecu did . the worst this would mean is that your crank enrich, post start numbers etc would need to be reduced to offset the increase in fuel pressure on start up Regards Dave [email protected] Quote Link to comment Share on other sites More sharing options...
Josh Burt Posted December 14, 2011 Author Report Share Posted December 14, 2011 This install is on a non WRX vehicle. I did make sure my injector duty setpoints were pushed out of the way and the pump still runs at full duty cycle after startup for 30sec. It is acting like it is hardcoded like Dave said, thanks for the info! Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted December 15, 2011 Report Share Posted December 15, 2011 No Sweat Josh At least we know what we're dealing with now... Thanks Dave! Quote Link to comment Share on other sites More sharing options...
Ben Jones Posted December 16, 2011 Report Share Posted December 16, 2011 Hey chaps, Can confirm this also happens on my BH Legacy with the same fuel pump controller. I scratched my head about it and concluded the same as Dave. The fuel pump will prime for a preset time even with the ignition turned off after priming has begun.....which is a royal pain the ass when youve forgotten to re-connect the fuel hose. Quote Link to comment Share on other sites More sharing options...
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