Upgrading injectors, how about the fuel pump?

[DriftN2Forty]

I have a '95 240sx KA24DE with the stock injectors, which I believe are about 370cc. I've been looking at the greedy 666cc's but was wondering if they would do fine without upgrading the fuel pump?

[180fan]

IIRC the injectors you've got now should be something like 270cc. Why are you upping the injectors, what other mods do you have to require 666cc injectors?

[Raxephon]

SR20DET injectors are 370cc VH45DE injectors are 370cc

KA24DE injectors are 265cc

I hope you have something to control those 666cc's other than the stock ecu.

[DriftN2Forty]

Then I guess my question is, how much can my current ECU handle? I'm rebuilding and have had the head ported along with a header from S&S. I just want to make sure my injectors arn't holding me back if my ECU can handle some more. Mine are the orignal stock ones and I want to replace them anyway.

[180fan]

your ecu can handle just what it's programmed for. aka 270's. Getting head work and new manifolds can do alot for breathing, but not enough to justify moving from 270's to 666 especially when you've nothing to tune it with. Increasing air flow without proper fuel management is asking for a world of trouble. You should talk to the guys doing the head work as to how much your head will flow, and from there you can figure out, ball park, how much power you could make and pick up injectors based on that. Then get the ecu flashed or possibly run an AFC to compensate.

[the red ka]

i have a 91 240 with a ka24de with stock injectors and was wondering how to take the injectors out with out getting fuel every where

[180fan]

pull the fuel pump fuse and let it run till it dies.