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Re: Stock Injectors
Standard pressure is 43.5 psi aka 3 Bar, which is the pressure that most injectors are rated at. You usually aren't going to have problems with running too much pressure on a fuel injector or them starting to act weird until above 100psi.
We sometimes raise or lower fuel pressure on cars on the dyno to either get more out of the injectors or more out of the fuel pump. For example if someone has way too much injector, but not enough fuel pump, then we might run a lower than normal base, but if you go too low then atomization suffers and you can start getting a funky idle/low throttle.
Often people don't play with it much though, because it requires making changes to the entire tune whenever you change the base pressure. Like if you run out of injector towards the end of a tuning session, then decide to raise the base 10-15psi to make the injectors bigger, then you need to go back and retune the idle and part throttle again.
Direct injection cars run fuel pressure in the thousands.
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