Vvc only revving to 5500 limit instead of 7200?
THIS IS WHY
The three electrical plugs get mixed up on the vvc mechs, AND it's down to good old MGR logic(?).
MEMS2J (200vi, BRM, MGF mk1) : From right to left, the correct connector colours sequence is Brown, Black, Blue.
MEMS3 (25GTi, ZR160, mk2 F/TF) From right to left, the correct connector colour sequence is now Black, Brown, Blue.
This simple change has resulted in numerous confused vvc owners
The other problem could be the vvc belt is misaligned or a cam sensor issue. A cam sensor problem will probably give you a limit of 6000
It's also vital that the correct type of oil is used. 10w 40 semi synthetic. Do not use thinner oil with a vvc.