Originally Posted by juiced2ndgenteg
how much boost are you hitting at 4k? you sure the map sensor isn't seeing boost and cutting fuel? are you using check valves? missing link? how are you bleeding off boost to the map sensor? with a sock ecu if the map reads any boost it freaks out and cuts all fuel, like rev limit.
The ecu wont shut off fuel when it sees boost. it will throw a cel and run richer.