EJ208 standard injector flow rates

[viperidae]

I'm in the proof of concept stage of developing a "trip computer" to measure fuel consumption by measuring injector pulse width

I've got a 2000 legacy gtb

I'm not about to take out an injector just to see that it probably doesn't have any part number on it anyway

The information I need is:

Flow rate

Dead-band time

I need this information is figure out how much fuel is squirted out

I've noticed that the ECU doesn't shut the injectors off completely when the throttle is closed at high revs

It drops back to ~0.6 - 0.7ms. Based on wild guessing, this could be the dead-band time?

The engine code is EJ208DWCBE

The injectors have about 12.5 ohms resistance

The plug on the injector is yellow

Any help would be appreciated

Once it is out of proof of concept stage, it'll be an open source project

[Guest]

i moved your topic here so hopefully it will get more notice, so you get the info you need, sounds like a good progect.

jump in the intro section and make yourself know aswell all helps

good luck

-smurff

[Optical]

Yeah it will be the injector dead time.

These values work for those injectors:

15V - 0.95ms

14V - 1ms

13V - 1.1ms

12V - 1.2ms

Assume 440cc at 80%DC at 3bar fuel pressure

[viperidae]

So I should measure the battery voltage and remove the dead time from the IPW before calculating duty cycle?

A ~1ms dead time would make quite a big difference as it only ranges from about 2ms at idle to no more than ~20ms

If only I could find a datasheet for the injectors or a flow rate/duty cycle graph

[Guest boostcut]

you would only realistically find these said duty cycle graphs if you went to a link computer or got a scan tool and logged all the data, the manufacturer or the inje may possibly have the info? but good luck getting it out of them

[viperidae]

 Optical said:

Assume 440cc at 80%DC at 3bar fuel pressure

Is that based on them being 550cc/min injectors, or actual real world values? (which going on info I've googled would make them about 600cc/min to flow 440cc at 80%)

[Guest]

 viperidae']

[quote name='Optical said:

Assume 440cc at 80%DC at 3bar fuel pressure

/quote]

Is that based on them being 550cc/min injectors, or actual real world values? (which going on info I've googled would make them about 600cc/min to flow 440cc at 80%)

These guys to some good testing, it proves nothings a straight line.

http://www.yawpower.com/injectordynamics.html

[viperidae]

I googled across injector dynamics and read a whole bunch of info there

I reckon I can pretty much do the calculations providing I can get the dead time and static flow ratings