Supa_Slow_Civic

Alright guys I was wondering if any of you had this problem before. Okay I just recently did a Crvtec swap in my ek. An now my problem is when im driving the car with a jdm P30 i can take my redline to 9 but the ecu isnt chipped or anything an my vtec kicks at 6200. So about a week ago i got my hands on a usdm 99-00 si ecu...the car ran fine and now its doing the same thing...Any ideas?