View Single Post
Old 09-09-2008, 12:11 PM   #16 (permalink)
EcoModding Lurker
Join Date: Aug 2008
Location: Massachusetts USA
Posts: 84

Ziggy - '95 Audi S6 Sedan

Manfred - '97 Audi A6 Quattro Sedan
90 day: 20.61 mpg (US)

Clarabell - '03 Audi A4 Quattro Avant

Sherman - '98 Audi A6 Quattro Avant

Cab - '96 Audi Cabriolet
Thanks: 0
Thanked 2 Times in 2 Posts
Originally Posted by dcb View Post
...I have no idea if that signal you have found will be accurate. We account for mechanical delay when measuring the injector pulse. I don't know if what you are looking at has accounted for that or not. You will have to carefully measure that pulse alongside the injector pulse and do some figguring if you want to be reasonably certain of the accuracy. I don't know how conditioned that signal has been, you are breaking new ground.
Good point.

I'll check the pulse width at idle. Since the 'Injector DelayuS' value is 500uS, I'd expect to see a pulse width of 500uS plus whatever injection time is needed to sustain idle. If the pulse width is less than 500uS (assuming that's the correct delay) then it's likely that the fuel consumption signal subtracts settling time from the injector pulse and directly represents the actual injection time.

If I can easily get at an injector wire I can compare that signal as a crosscheck.
  Reply With Quote