injector PW vs. duty cycle

[Reeves]

Hey guys,
Can anyone figure out injector duty cycle by having the injector PW and RPM?

Here's what I got:

> Injector Pulse Width (ms) RPM Boost (psi)
> 21.3 4709 25.3
> 21.2 4600 25.3
> 21.2 4800 25.3
> 22.7 4519 25.9
> 22.7 4602 25.9


Thanks!

[4sfed4]

Sure thing James.


21.3 ms at 4709 rpm = 83.6%
21.2 ms at 4600 rpm = 81.3%
21.2 ms at 4800 rpm = 84.8%
22.7 ms at 4519 rpm = 85.5%
22.7 ms at 4602 rpm = 87.1%

[Reeves]

AWESOME Larry....Thanks!

What conversion did you use for this? We have a program that reads scanner info and this would be great conversion to install so that we know duty cycle right off the bat!

[4sfed4]

Quote:

Originally posted by Reeves AWESOME Larry....Thanks! What conversion did you use for this? We have a program that reads scanner info and this would be great conversion to install so that we know duty cycle right off the bat!

Yes....Ive heard about that program and sure wouldnt mind if you emailed me a copy of it! Writing the data down is terribly cumbersome! My email is larry.jolliffe@verizon.net!

The formula for injector duty cycle is easy.

First you find the Max Duty Cycle for the injectors. This is defined by engine speed:

Max Injector DC (in ms)= (60000 / rpm) * 2

Thus, for 6000 rpm:

Max Injector DC = (60000 / 6000) *2 = 20 ms

Now, take your measured DC at any given rpm and divide it by the max DC for that same rpm.

So, if you measured 15 ms at 6000 rpm, then the actual duty cycle
would be:

15 / 20 = 0.75 or 75%.

[Reeves]

Where did the 60000 come from in the equation?

Also, it's not my program to give out...but I will ask the author for you.