tephanie Posted January 21, 2018 Share Posted January 21, 2018 hey guys i have a jdm auto supra with stock twins. and 440 injectors i changed my fuel pump and installed a aem fuel regulator.. What is the stock fuel pressure at idle i should set it at? (all the lines are attached) Link to comment Share on other sites More sharing options...
Delboy52 Posted January 21, 2018 Share Posted January 21, 2018 Info from USA Supraforums Toyota GTE Service Specs... Fuel Pressure at Idle w/vacuum hose disconnected is 33-40psi (2.3 - 2.8 kgf/cm) Fuel Pressure at Idle w/vacuum hose connected is 24-31psi (1.7 - 2.2 kgf/cm) Correct fuel pressure at idle doesn't necessarily confirm a correct fuel pressure at boost. Fuel pressure should always be 36 psi. above the intake manifold boost pressure at all times. example...10psi boost =46psi FP, 15psi boost=51psi FP, 20psi boost = 56psi FP Toyota GE Service Specs... Fuel Pressure at Idle w/vacuum hose disconnected is 38-44psi (2.7 - 3.1 kgf/cm) Fuel Pressure at Idle w/vacuum hose connected is 28-34psi (2.0 - 2.4 kgf/cm) Link to comment Share on other sites More sharing options...
Wez Posted January 21, 2018 Share Posted January 21, 2018 Set the pressure with the vac hose disconnected and then check again once connected. Do you have an AFR gauge, if not it would be a very good idea to install one when playing with fuel components, make sure its a wideband too Link to comment Share on other sites More sharing options...
tephanie Posted January 21, 2018 Author Share Posted January 21, 2018 doesnt the us have 550 injectors and differrent turbos Link to comment Share on other sites More sharing options...
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