I was running RC injectors 440cc, so 45% of 440 is 242 so very close the STD injector size OFF boost as most engines will be.
Then as the HP increases way out of the range of the STD Big K map the PC map increases the fuel flow by allowing the injectors to be open longer.
To the point were they are open the same amount of time as the STD map BUT pumping in more fuel because the injectors are bigger.
Then open even more than the STD map to pump even more fuel in ending up with a PLUS number.
If I had used a smaller injector then the Minus numbers would have been Plus numbers sooner in the map to compensate for the smaller amount of fuel at that point in the map.
The blue line is the path the map used as the boost and engine rpm increases thru the run. I know this from the data logger.
My notes above in red are to change the map 2%, 10% and 40% columns based on the AFR (Air fuel Ratio) again from the data logger.
I change the whole column but in reality I only needed to change the numbers within the blue line in the relevant column. It's just my way and easier.
The red numbers at the lower side are my change notes at full boost full RPM. The two blue numbers are the AFR at that point in the RPM/boost range.
You can see I am starting to run weaker as the RPM increases so I changed the set of number in the map to the RED number to keep the AFR nearer to 11.
