Guys, long time never post here, busy on my project on upgrade to 1.8, already pass my 1000km run in period, everything smooth and powerfull, until last weekend I try to plug in 4G93 ecu, engine not so smooth as before, my upgrade from 4G91 to 4G93 as below
1.8 Block, rebore to 82mm
1.8 Engine Head and Cam
1.6 Piston (higher compression)
Fuel Pressure Regulator, 3.3bar
1.8 240cc injector
1.8 Internal
1.8 GTI TB
ECU, Air Flow sensor use back 4G91 one, everything very smooth and suprising my FC not bad! one tank can last me 420km@RM70, but engine start behave weird after I upgrade to 4G93 ecu (dunno what code), engine low end not smooth but mid to top end faster, rev cut also higher, guess around 7500rpm, any sifu can advice me what is the problem? my machanic say is because the Air Flow sensor, anyone can help me?
One more thing, is it worth to do PNP engine head? will it affect low end?