Problem with power after 5500rpm

[canary-s14a]

Hi, i dyno test my s14 last week and have a problem, the power comes down after 5500 rpm

What can be the problem or what should i test?

the compression is 135 psi (little low so maybe this is the problem), the a/f with stock fuel pressure (43 psi) is 11:1, and in that dyno test i low to 40 psi to reach 11,8:1, it doesnt seem to be any boost leak, the engine have a rattle sound, maybe the vvt or maybe lifters, not sure...



And this one is how it should look like one with same mods and same ecu chip upgrade



Im running, gt2871r boosting 1,4, full exhaust with manifold, intake, fmic, walbro, z32 afm, ngk 8 plugs, blitz sbc controller

Can read more about my problem here:

http://www.sxoc.com/vbb/showthread.php?t=434511