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I found injector specs for my 97 A6. Using Yoshi's formula, I calculated the injector settling time to be 615uS. Scaling that down to the ECU pulsewidth, I get 72uS. That's what I'm running now.
Over the weekend, I calibrated my uS/gal setting on a 250 mile trip. I filled the tank and reset everything. When I next filled up, my MPGuino said I had used 13.28 gallons. That was with a uS/gal setting of 123000000. The fillup was 13.53 gallons. So, I decreased the uS/gal setting a couple of times until the gallons read 13.53. I'll continue to check it over the next couple of tanks but I think it's real close now.
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