Re: EF XR 6 Air/Fuel Ratio on Dyno
This sounds pretty typical.
You could just change to a std non xr pressure regulator which would lower the fuel pressure fairly cheaply. An adjustable one will take a bit of setting up and control which is not so obvious. Thats why the Unichip just knocks back the duty cycle and adjusts the mixture despite the fuel pressure as long as its high enough for full throttle and yours is in a big way.
This is way to rich for top performance.
AUII Auto wagon 4.0L InTech Pacemaker PH4480 extractors, 2.5" exhaust, JMM DEV3HL Cam Unichip 144rwkw. 1/4 mile email@example.com