2.5LOYALE Posted July 27, 2011 Share Posted July 27, 2011 i am looking to comfirm some information. did an engine swap in a 92 loyale 4wd wagon with a 2.5l out of an 02 impreza rs. from the info i got the stock loyale fuel pump pushes 28-33 on pressure. and the impreza runs about 43 on fuel pressure stock in there respective vehicles. i am haveing some issues when giving her juice and it seems the fuel pump is not pushing enough pressure when needed. fuel pressure has been tested when running to ensure its only pusing 30 psi. i am looking to upgrade to a 50 psi fuel pump, anybody done a upgraded fuel pump before? or had this issure. thanx guys if anybody can confirm these specs that would be some useful information.................help... Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted July 27, 2011 Share Posted July 27, 2011 The stock SPFI pump (the one on your Loyale) IS a 50 psi pump, though it is regulated to 21 psi via the throttle body pressure regulator on the SPFI. You can simply crimp the return line and you will see the pump's pressure capability on your test gauge. The 2.5 from that Imp is about a 165 HP engine. I have been involved with higher powered builds using the SPFI pump and have not had a single issue with them keeping up. We currently have a ~200 HP EJ25 in a Brat that is running the SPFI pump without issue. It is possible that your pump is weak but probably not. If fuel pressure is your problem then your fuel pressure regulator on the injector manifold is bad. GD Quote Link to comment Share on other sites More sharing options...
2.5LOYALE Posted August 3, 2011 Author Share Posted August 3, 2011 the only issue i am having is when i start the vehicle after sitting the idle jumps up to 3 thousand rpms and stays there with the car not in gear. the only other symptom is when on heavy acceleration i am getting a sputter or not so consistant pull. no matter what gear. the car runs fine but is having trouble somewhere on acceleration. i dont think i is the transmission. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 3, 2011 Share Posted August 3, 2011 Sounds like you need to check for ECU codes and figure out what's up with your wireing. It should not rev to 3k on startup - that's obviously something to do with your swap wireing. Is the OBD-II connector still present? Do you have a working CEL? Have you checked for codes? GD Quote Link to comment Share on other sites More sharing options...
2.5LOYALE Posted August 4, 2011 Author Share Posted August 4, 2011 Pullin them today will let u know Quote Link to comment Share on other sites More sharing options...
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