View Single Post
Old 02-27-2009, 12:04 PM   #33 (permalink)
rmccomiskie
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
Injector Delay uS

I've assumed all along that the ECU fuel flow signal is an exact representation of the injector signal but narrower so all 6 injector pulses can be included within the same time period. Given that it looks like the ECU pulses are 0.123 times the injector pulse width, I expect the settling time to be similarly scaled.

For an injector settling time of 500uS, the ECU settling time would be 0.123 * 500uS = 61.5uS; Injector Delay uS = ~62uS.

I'm going to use 62uS unless experimentation disproves my theory. Keep in mind that the 500uS injector delay is simply an assumed value based on experience across a lot of different injectors. It may or may not be correct for an Audi injector.

These posts give some background information on the injector settling time issue:
http://ecomodder.com/forum/showthrea...html#post31602
http://ecomodder.com/forum/showthrea...html#post34576
http://ecomodder.com/forum/showthrea...html#post34738
http://ecomodder.com/forum/showthrea...html#post34902
  Reply With Quote