Fuel questions

[0range_240]

If Im only looking to run 5-6psi of boost, do I need to upgrade my fuel pump and injectors?

[90lkn4swp]

Yes

[C-Kwik]

If you go with only moderately larger injectors(of course you need to have some way to compensate for them), you will likely not need to change the fuel pump. AS long as the stock pump is working fine, it can provide plenty of flow at the fuel pressures it will be seeing.

[voddka]

You're pushing it at 5-6 psi, but you can do it (Max PSI the stock system can handle is 6 psi IIRC.) Also, it depends on the turbo size, as the fuel system will hafta compensate less for a T25 or small T3 at 5-6 psi than a T3/T04E at 6 psi.

[Drift Machine]

You could always go with a new fuel pump and a RRFPR.

[C-Kwik]

You're pushing it at 5-6 psi, but you can do it (Max PSI the stock system can handle is 6 psi IIRC.) Also, it depends on the turbo size, as the fuel system will hafta compensate less for a T25 or small T3 at 5-6 psi than a T3/T04E at 6 psi.

I've seen 11 psi run on a stock pump. On a RRFPR, a fuel pump can be more critical, since you are trying to flow enough fuel while increasing pressure as well. But the problem is that when you increase pressure, you decrease the pump's ability to flow. While with a set-up that uses only larger injectors as the only fuel mod, the pressure increases only as much as the boost you run. This is not nearly as much as say an 8:1 RRFPR(FMU). And with an FMU on my stock pump, it started getting detonation around 8 psi. Since I'm running a lot less fuel pressure under boost than with an FMU, the pump is able to flow more than the FMU set-up. I wouldn't be surprised if a stock fuel pump can supply enough fuel for over 15 psi.

[huguetpj]

If Im only looking to run 5-6psi of boost, do I need to upgrade my fuel pump and injectors?

NEED - noSHOULD - yes

I've run up to 7PSI on my STOCK fuel system. Safe? Dunno but my blinky autometer gauge says I'm ok. :pface

Also, some stock fuel systems are better than others, due to use and/or abuse or other characteristics.