Guest mck2 Posted June 2, 2003 Share Posted June 2, 2003 I have an intercooled 1983 turbo engine in a 240Z. 240Z fuel lines. custom fuel rail. Stock 280cc injectors, 1983 fuel pump and pressure regulator. 1/2Volt drop at the pump. Max observed fuel pressure is 43psi at 12psi boost. Base pressure at idle with vac hose off reg is 38psi. So we need 38+12=50psi? Dyno indicates too lean above 4500 rpm. Do I need a better pump or a rising rate pressure regulator??? Give model numbers if possible. Might use 370cc someday. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted June 2, 2003 Share Posted June 2, 2003 It sounds to me like you have a failing pump. If it were a simple line restriction, your base pressure would be off as well. I wouldn't run 12 psi boost often with that drop in pressure. At the very least, replace the pump with a high pressure Bosch pump, the stock one will not flow well over 12-14 psi boost anyway. I just installed a new CIS Bosch pump for a 77-79 Porsche 911, and it's working well with 15 psi boost. Opinion: RRFPR is not right for AFM or MAF systems. It works better for Hondas and other EFI systems that use 1 bar MAP sensors. HTH Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted June 2, 2003 Share Posted June 2, 2003 It is possible that the stock pump can't keep up as well. I say... new fuel pump. Walbro GSL-392 is the unit I am using with a 43psi base and no pressure drop (63psi) at 20+ lbs of boost. Quote Link to comment Share on other sites More sharing options...
bumble zee Posted June 2, 2003 Share Posted June 2, 2003 i am living proof that stock z pump dont like 18 pounds of boost!! burnt out 2 at 18# and one at 16#... all well... i have a upgraded one coming Quote Link to comment Share on other sites More sharing options...
Guest Zcarsmakemyheadhurt Posted June 2, 2003 Share Posted June 2, 2003 Get rid of the pump.... Quote Link to comment Share on other sites More sharing options...
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