New Tuning Question

[ChicagoGSX]

I installed my 550s today and I started tuning with the S-AFC. I started with -10 for the low throttle settings, but this gave me an awful idle and the fuel trims were way off and told me to richen it up. I had to keep adding fuel until I was at +6 for 1000 RPMs which finally gave me a good fuel trim. For 2000-7000 I had to +10 on the S-AFC to get good fuel trims when cruising. The problem is that I think it should be -10, or am I backwards. Does + on the S-AFC mean I am actually taking out fuel? I always thought - meant I was taking out fuel. Any help would be great.

 

[ChicagoGSX]

Originally posted by ChicagoGSX
I installed my 550s today and I started tuning with the S-AFC. I started with -10 for the low throttle settings, but this gave me an awful idle and the fuel trims were way off and told me to richen it up. I had to keep adding fuel until I was at +6 for 1000 RPMs which finally gave me a good fuel trim. For 2000-7000 I had to +10 on the S-AFC to get good fuel trims when cruising. The problem is that I think it should be -10, or am I backwards. Does + on the S-AFC mean I am actually taking out fuel? I always thought - meant I was taking out fuel. Any help would be great.

Ok I confirmed that - takes out fuel and + adds fuel. After reseting the ECU I got it so +4 gives me pretty good fuel trims, but it still makes no sense. Why would I have to add fuel after getting bigger injectors?