Fuel Pressure

[CAPTEN]

I've been trying to find imfo on fuel pressure.I have an standard RB20 with a large intercooler,exhaust & fuel pressure regulator being the only upgrades on intake & exhaust parts of car.It being A31 Cefiro.Have a mate that runs 45psi at idle.& one that runs 65psi.both are RB20's.The one with the most mod's runs the lower of the two.me confused. please HELP!!!!!!!!!!

[toffy]

usually around 40psi for factory base fuel pressure , but imo your best talking to a tuner , its not something you wanna get wrong. (and a fuel/air ratio guage imo is a must)

[daisu]

Running a higher fuel pressure you can squeeze a bit more fuel out of the injectors as opposed to buying larger injectors.

It is a cheap alternative but you can only push it a little bit.

Presumably your mate with the higher fuel pressure kept stock injectors, and your mate with the lower fuel pressure upgraded to larger injectors.

There is no point in adjusting your fuel pressure or upgrading the injectors unless you have some sort of aftermarket ECU to control the amount of fuel going in.