Your numbers look good and the curves are nice and smooth. I love E85. I disagree with your tuner, the cat is not hurting spool up. A restriction in the exhaust will show up at high RPM as the torque falling off, not long spool up time. Your torque is holding pretty steady. However, something is slowing spool up. I have only dynoed five 1.6L engines with GT2560s on them and only two at 15psi or above. Both of those engines passed 200ftlbs between 3800 and 4200rpm. On all my dyno runs the engines are making at least 140ftlbs at 3000RPM.



What is you altitude? Setups like yours take forever to spool up above 3000ft.

What does the ignition map look like in the 3500 to 3500 RPM?

Are the EBC settings keeping the wastegate closed as long as possible to spool up the turbo?