injector upgrade

[CTScott]

The 1ZZ injectors should be fine up to at least 8psi of boost. You more likely are having issues due to flow into the injectors (from the stock pump) or fuel pressure (ideally fuel pressure should increase by 1 psi for each 1 psi of boost). I have modified stock fuel pressure regulators for people to give them a cheap upgrade by increasing the pressure regulator from the stock rating (41-45 psi) to that plus their max boost (i.e. 43 to 51 for an 8 psi setup). By doing that you account for the maximum plenum pressure, but then have to pull a little fuel at lower boost to compensate for the extra pressure.

[Ryze268]

Originally Posted by CTScott

The 1ZZ injectors should be fine up to at least 8psi of boost. You more likely are having issues due to flow into the injectors (from the stock pump) or fuel pressure (ideally fuel pressure should increase by 1 psi for each 1 psi of boost). I have modified stock fuel pressure regulators for people to give them a cheap upgrade by increasing the pressure regulator from the stock rating (41-45 psi) to that plus their max boost (i.e. 43 to 51 for an 8 psi setup). By doing that you account for the maximum plenum pressure, but then have to pull a little fuel at lower boost to compensate for the extra pressure.

sweet, could you do the same for me. I don't mind paying you if this would solve my problems.

[CTScott]

Originally Posted by Ryze268

sweet, could you do the same for me. I don't mind paying you if this would solve my problems.

It would very likely help. Fnkngrv had me modify one for him and it worked up to about 12psi of boost, where at that point the stock pump couldn't flow enough fuel.

How many PSI of boost are you running?

I usually have people ship me their regulators to adjust, as new ones are crazy expensive (about $80+). In your case, that would probably be cost prohibitive for the shipping time and cost.