Injector flow

[wrench459]

As I understand the injector flow is not linear. Theres variables involved ie battery voltage,fuel pressure,pulsewidth..
So do I need to static flow one injector to get the low and high slope rates?
From what I've learned so far is where the two slopes cross is called the break point. Aint this fun

[greenbarron]

Originally Posted by wrench459 As I understand the injector flow is not linear. Theres variables involved ie battery voltage,fuel pressure,pulsewidth.. So do I need to static flow one injector to get the low and high slope rates? From what I've learned so far is where the two slopes cross is called the break point. Aint this fun

You are correct, battery voltage effects how open the injector is, pulsewidth is how long the injector is open for, and and fuel pressure should be self evident.

Two things, are you using a peak-hold injector driver, or are you using the acrane injection methods? A peak-hol injector opens the injector with a high voltage-current pulse followed by a holding the injector at a low voltage/current. These second injectors have active feedback to hold the injector open at the correct level, and therefor are mostly independent of the battery/alternator voltage. I don't know how you are controlling the injector, but generally if you are using computer control just size so that at max. fuel consumption the injector is running around 80-85% of it's max output. The electronic control module is suppose to deal with the rest. The extra head room is to deal with the injector getting old, a low power condition, or poor fuel pressure, etc.

So...if you have a modern ECM then there is no need to static flow the injector, just look up the datasheet (can be difficult to get) for your injector and read their charts, while sizing accordingly.

-Quentin

[wrench459]

Originally Posted by greenbarron So...if you have a modern ECM then there is no need to static flow the injector, just look up the datasheet (can be difficult to get) for your injector and read their charts, while sizing accordingly. -Quentin

Quentin
I've been playing around with the idea of running a EEC IV fuel management system for a few years now. Heck I've got a ford ignition system already installed just waiting for a tps hookup for the load map.
Now things has changed with the acquirement of a really sweet tuning software(still learning the ins&outs) for the big three manufacturers.
So now that I can get to the maf transfer function for tuning. Theres a big possibility of running a EEC V pcm with dual injectors.

Dan