Good evening please excuse the inexperience very new to this. I have a 91 hatch built for circle track racing. Car has a built B18c1 run on a p28 s300. I will attach build sheet, car was tuned on a dyno and ran great. We have since taken it to the track and it refuses to rev past 5k. Tried a stock p28 tune with the s300 no problems reving past 5k. We even plugged in a stock p28 ecu runs ok and revs past 5k with ease. I feel like it's a simple fix but we are just lost.
Thank you
