This is also in my other post. With all my fuel mods minus the 550cc injectors( I put my stock ones back in) what is the max boost I should run without clipping my stock injectors. Keep in mind I have a afpr, afmu, 255lph fuel pump?


"Spent way too much to give up now!!!"

i got the walbro 255 pump, cartech FMU, stock fpr and stock injectors(well outta a 98z24) . I run 5 psi of boost and been doing fine for a year or so.

my car sees 50psi of pressure at idle, almost 60 with the vaccume line un hooked, but not sure if that is normal, as my other stock regulators had about 42psi at idle. This regulator is off a 2k2 z24 which we noticed it was a higher psi then others. odd. or it is the higher pressure pump/ or FMU. i dunno, or care, it runs perfect in or outta boost.

Not sure what my a/f ratio is, but my spark plugs look perfect and i better yet i get 29-32 miles per gallon.


I personally wouldnt go over 5-6 psi .

good luck

any other input on this? Its just until I get 370cc injectors.


"Spent way too much to give up now!!!"