Need Clarification On How Much Power Can Safely Get From 700cc Injectors?

[paulr33]

just be careful with mega CC injectors and low rated or normal size pumps

the issue here is that, if it leans out, and your on full load (typical)

then your AFRS plummet off the planet and the engine goes bang

youll have very little warning / chance to save it, if this occurs

so, if you install mega CC injectors, you are taking a big risk by keeping a low rated pump

your risking a $10k+ setup for the sake of $400 ish on a larger flowing pump

the pump wont fail, and if it does, this is ok, as fuel stops flowing, the engine stalls

the issue becomes critical when not enough fuel flows, ie ; the pump cant keep up

the engine has enough fuel to keep running, but the AFRS plummet and it goes bang

so Nosure - your pump wont fail, and if it does, thats ok, the tuners concern is, if it cant keep up demand, then its bad

[R31Nismoid]

I have nismo fuel pump, and 800cc injector. run 1.28bar, make 312kws on all 4. the tuner told me this is the limit of this fuel pump. if go up boost, the afr will leaning out. now the afr is between 11.5-12 which is safe. but my injector duty only about 70%. tuner suggest me replace a fuel pump or surge tank setup.

does that mean my nismo fuel pump failure? or it was really tue limit of nismo fuel pump.

my car is gtr 34.

you can make that power on stock 440 injectors and stock pump

So you have one of 3 likely problems

1. The pump is dying

2. The fuel filter or something is blocked

3. The pump isnt wired correctly

Its a likely story that its #3 - so often people post up here about lack of fuel etc only to find out the pump is not wired correctly with the required voltage