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Can someone point me in the right direction. I have installed a vipec i88 on a Porsche 944 turbo. it is 4 cyl 2.5lt running sequential ignition with LS2 truck coils and sequential injection. I have the ecu setup on model fuel equation. I am using a stock timing map and am starting to tune the fuel map. It runs fine in every gear until I hit 3000rpm. It is like a brick wall and will start to detonate. It will rev past 3000rpm fine in neutral. 3000rpm is when the turbo should really spool but again it is running fine building up to 5psi under 3000rpm. Im not sure what it is but am leaning towards ignition setup?? If anyone has any experience and can help me out, it would be much appreciated. Alastair