Preludedude Posted October 13, 2015 Report Share Posted October 13, 2015 Just got my spa turbo afpr installed. I don't know what stock pressure is but I have it set at 42lbs at idle currently. I have 650/950 Delphis from Brian at Lower Shores.... What should it be set at approx? I know it depends on your setup... Link to comment Share on other sites More sharing options...
speedyquest Posted October 13, 2015 Report Share Posted October 13, 2015 (edited) Those from everything I've read want 44 psi as a base. That is what I run mine at. The stock injectors want/like 36 psi but most aftermarket need 44 psi to atomize the fuel properly. Edited October 13, 2015 by speedyquest Link to comment Share on other sites More sharing options...
importwarrior Posted October 13, 2015 Report Share Posted October 13, 2015 i agree i am running about 43 Delphi's from what i have read like to run about 43 psi . stock is 38 PSI Link to comment Share on other sites More sharing options...
mstieg Posted October 24, 2015 Report Share Posted October 24, 2015 Correct. I'm running the 65 lb Delphis. Looked em up and they call for a base of 43.5psi at duty cycle < 85%. Now my question is...to still use the rising rate on the MSD 2222 or find a bolt and lock it in at 43psi as SDS recommends (not using rising rate)?? Link to comment Share on other sites More sharing options...
ucw458 Posted October 24, 2015 Report Share Posted October 24, 2015 You need the rising rate regulator on boosted cars. Lets say the injector needs 40 psi to spray correctly so you set your regulator to 40 psi. That's 40 at atmospheric pressure. Now you boost to 15 psi and the manifold pressure cancels out 15 psi of fuel pressure. Now the injectors are firing poorly at 25 psi. A rising rate regulator ups the fuel pressure to compensate for boost pressure. So at 15 psi of boost the fuel pressure will be 55 psi. Link to comment Share on other sites More sharing options...
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