Injectors

[GHOST]

simple question what is the max boost that the stock injectors can handle before you have to change them out to accomodate more boost?

[JimX]

It depends. Mine is leaning out at 14psi, but others can run up to 16-18psi. The only way to really be sure is to get a tuning shop to run it up on the dyno and experiment with different boost levels. Retarding the timing can also let you run higher boost, at the cost of low-down power.

Edit: Btw, this is assuming stock turbo or mild upgrade. If you put a real bigass turbo on, you will probably start leaning out after 8 or 10psi. More power=more fuel required.

[GTS-t VSPEC]

GHOST, I'm getting 411rwhp from stock injectors at 17psi, with increased fuel pressure. Don't be in a hurry to change injectors untill your on about 90% duty cycle.

[Steve]

Boost isnt really the issue, airflow is. A big turbo will flow alot more air at lower boost than a smaller turbo at a higher boost - probably more appropriate to ask what sort of power can be made.

I know of several RB25s making over 250rwkw with big fuel pump and adj fuel pressure reg, without running out of injector duty.

[Guest INASNT]

Originally posted by GTS-t VSPEC

GHOST, I'm getting 411rwhp from stock injectors at 17psi, with increased fuel pressure. Don't be in a hurry to change injectors untill your on about 90% duty cycle.

but your car is a freak and there is a thread which is 12 pages long and counting arguing about it

[GTS-t VSPEC]

I don't think the car is a freak as there a few others doing similarly well on standard injectors. I'm not saying that you shouldn't upgrade, but you don't need to do it prematurely.