At what point is Fuel Pump/Injector upgrade required?

[Guest]

Hey all,

Did a brief search but didnt turn up what i was looking for. Basically wondering at what point you guys are finding that your Fuel Pump/Injectors aren't cutting it any more?

I want run ~13psi (with aftermarket FMIC), reckon it should be ok?

Cheers,
Ant

 

[matchtheclown]

Yeah I think I read over 15psi... and you need a piggy back or similar ECU to do it anyhow.

So you should be right.

 

[Kenneth]

Anything after 190KW at the wheels and you should upgrade the fuel pump.

Standard fuel pump is otherwise fine.

Injectors will get you about 220KW at the wheels on 90%, at which point you need new ones. Injectors are usually rated to 80% duty cycle so in reality you probably want to upgrade them at around 200KW

/edit: I should say that is for a Manual VR-4. Auto has about another 7% drivetrain loss and that has to be taken into account.