KF_Colt Posted September 5, 2019 Share Posted September 5, 2019 I installed supra black top 430cc injectors on my stock fuel rail for the 1981 280zx. The car would start at times but most of the time wont. When I first attempt a start it gets very close to starting but bogs out. I took out the plugs and they have a small amount of black liquid on them, and smell very faintly of gas (not as much as i would think however). Do I need to install an aftermarket fuel rail to adjust the angle at which the new injectors spray? because these new ones are four port on the end not the single port the stock injectors have. Quote Link to comment Share on other sites More sharing options...
cgsheen Posted September 5, 2019 Share Posted September 5, 2019 Why did you install 430cc injectors? Do you have an aftermarket (standalone) ECU? If you're using the stock ECU, those injectors are FLOODING your engine and the stock ECU has no way of adjusting their pulse width for the increased flow that they have over stock injectors. Quote Link to comment Share on other sites More sharing options...
Zcardude Posted September 5, 2019 Share Posted September 5, 2019 FWIW I have run 550CC RC engineering injectors on a stock ZXT rail without issue, controlling them with a MegaSquirt II unit. Definitely echo what cgsheen is saying about needing an aftermarket ECU. With stock ECU, you need to stay very close to stock-specced injectors and fuel pressure or you are going to have a difficult time Quote Link to comment Share on other sites More sharing options...
KF_Colt Posted September 6, 2019 Author Share Posted September 6, 2019 19 hours ago, cgsheen said: Why did you install 430cc injectors? Do you have an aftermarket (standalone) ECU? If you're using the stock ECU, those injectors are FLOODING your engine and the stock ECU has no way of adjusting their pulse width for the increased flow that they have over stock injectors. Yeah I have MS2 and Ford EDIS working. Quote Link to comment Share on other sites More sharing options...
Zcardude Posted September 6, 2019 Share Posted September 6, 2019 (edited) 2 hours ago, KF_Colt said: Yeah I have MS2 and Ford EDIS working. Was it running fine before upgrading the injector size? If so, after installing the new injectors, did you update the injector size in your general options in tunerstudio? You will likely need to do a bit of tweaking on the VE table as well in my experience Edited September 6, 2019 by Zcardude Quote Link to comment Share on other sites More sharing options...
cgsheen Posted September 6, 2019 Share Posted September 6, 2019 But, to answer your original question: No, you do not necessarily need to install an aftermarket fuel rail... Quote Link to comment Share on other sites More sharing options...
KF_Colt Posted September 6, 2019 Author Share Posted September 6, 2019 1 hour ago, Zcardude said: Was it running fine before upgrading the injector size? If so, after installing the new injectors, did you update the injector size in your general options in tunerstudio? You will likely need to do a bit of tweaking on the VE table as well in my experience Found the Issue! Was a combination of my toothed wheel being offset (not by much), the VR sensor not being close enough (although i never got the infamous "missing teeth" error), the fuel pressure regulator being shot, and most importantly... bad gas. I emptied the tank after putting in treatment and wow was it brown, I'm going to need to treat the tank. But you also were right with the VE table, I havent tweaked it that much because I just wanted at the least a shite idle. Thank you both for the help! Quote Link to comment Share on other sites More sharing options...
KF_Colt Posted September 6, 2019 Author Share Posted September 6, 2019 14 minutes ago, cgsheen said: But, to answer your original question: No, you do not necessarily need to install an aftermarket fuel rail... Found the issue, and thank you for the straight forward answer Quote Link to comment Share on other sites More sharing options...
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