Alright guys, I need some input here.

After installing the 626 IM and the Turbolife FMIC, I've noticed that my air fuel ratios from 4.5-5.5K RPM are a lot leaner than they used to and should be. I see nice and stable AFRs of 11.0-12.5 up to 4.5K, then after that they slowly climb into the 13's and sometimes even hit a low 14 around 5K RPM. Then after 5.5K RPM they drop back down into the 11's.

It doesn't make any sense though. The pump shouldn't be maxed out, and neither should the injectors.. as plenty of MSP guys have the same setup with no problems. And why would the AFRs drop back down after 5.5K?

The 626 manifold delivers a whole boatload of air at those RPMs, so it could be that in combination with the Turbolife FMIC there is just simply too much air being rushed into the engine for the BEGi RRFPR to keep up. Which is also adjusted for the maximum gain by the way, but I still get this lean spot for some reason. Anyone have any idea?

Is it time for bigger injectors?