wigenOut-S30 Posted October 23, 2006 Share Posted October 23, 2006 Hey guys, I put mark 3 non turbo supra injectors in the Z. They are 311CC. Right now I am running 30 psi base fuel pressure at idle with the vacuum hose on. Anyone with a stock non turbo MRK3 supra know what there stock fuel pressure is? I tried surching supra forums.com but it seems there search engine is down. Just thought someone might have the info here? Thanks.. PS I searched here as well just in case.. didnt find anything. Gabe Quote Link to comment Share on other sites More sharing options...
Clifton Posted October 26, 2006 Share Posted October 26, 2006 N/A and turbo have the same FPR. Book says 33-40 psi without vacuum. Mine was 38/40 psi without. You know n/a injectors are high imp. right? Quote Link to comment Share on other sites More sharing options...
TimZ Posted October 26, 2006 Share Posted October 26, 2006 Fuel injector ratings are generally given for flow at 3 bar (43.5psi) across the injector. Your base fuel pressure is not the pressure you get at idle, it's the pressure you see with the hose disconnected. As I recall, the base pressure for the Z is 2.5 bar (36.25psi). Since the injector flow is proportional to the square root of the pressure, your 311cc rated injectors should flow sqrt(2.5/3) *311cc, or about 284cc. Quote Link to comment Share on other sites More sharing options...
Garrett76Zt Posted October 27, 2006 Share Posted October 27, 2006 Cool Tim. I actually just learned that the other day from a buddy. That injectors are rated at 3 bar. I thought that they were rated at whatever base psi was on their particular application. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted October 27, 2006 Author Share Posted October 27, 2006 Thanks for the help guys.. As far as the N/A being high imp.. I think they are low emp. they run my Z perfectly. if they were high imp they wouldnt work right at all right? so far the Z is running really well. 14psi and 12.0 air/fuel.. But down low and cruise she sits around 13.6-14.0 which is rather rich.. but being a afm car I will live with that till I go stand alone. She is faster then she ever has been thats for sure . with my old setup stock inj, 11psi and 2.5" exhaust I ran a 13.0.. I am hoping with the 3" exhaust walbro fuel pump upgraded injectors, 14-15psi of boost will put me mid high 12s.. Quote Link to comment Share on other sites More sharing options...
Clifton Posted October 27, 2006 Share Posted October 27, 2006 Thanks for the help guys.. As far as the N/A being high imp.. I think they are low emp. . You're right. I just looked through the fsm. Quote Link to comment Share on other sites More sharing options...
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