I have attached a chart of CO% over time during warm up.
This data has been collected from multiple 250's and 280's local here in San Diego. We use it for tuning and overall understanding what the heck is going on with the FIP😄. As you can see from the chart some cars were running lean or rich and then tuned correctly.
The take aways are:
- You want the overall curve shape in the graph. The curve shape can compress/extend, shift down/up depending on factors when you start taking the next tuning steps.
- Notice the low dip on chart toward the end? Thats the time that the airslide valve is still slightly open for that lean period I was taking about in the last post.
Regarding fuel flow, I believe it's ~1 liters in 15 seconds? Someone please check my memory🤣
When I did the test I did it right before FIP. I think I just read a couple of weeks ago (again check my memory 😄) it was also good to test flow at the return line to the tank.
More tests/info can never hurt😄