Power loss @4900rpm

[davidlizard]

I experience a weird power loss @ 4900 rpm from third to fifht gear. It feels
like a cut-off or an irregular boost. No boost leak has been found,fuel pressure is good etc... My 2004 a4 1.8t sport package is unitronic chipped stage 1+. Does anyone has ever experienced this kind of trouble or has an idea? Someone talk me about the m75... The trouble is intermitent... In 3rd, 4th and 5th gear, it's almost impossible to reach 6000rpm so it feels bad

... thank you and sorry for my english, I'm a french speaker!!

on a graphic,it feels like a waved curve

[jcg05c]

i know on basic ko3 anything after i think 5.5k sucks anyways. Not sure how unitronic works and i have stick.

[AudiA4_20T]

thats called the K03, yes it sucks that bad