hi all, im new on the forum after buying a s3 8l 210 bhp . mods done are Badger5 V2 Turbo Intake Pipe, Relentless / XS power 3" downpipe with decat into a 2.5" powerflow stainless decat back system. Stage 1 custom Rtech remap, forge 008 DV and a few silicone forge hoses that replaced broken standard ones. its at 265bhp and 275 ft lb.
the problem is sometimes in 4th then most of the time in 5th and 6th. along the motorway i would be doing under 3k revs put my foot down halfway / all the way then the boost would shoot upto 20psi then drop off to 10 psi untill i hit just over 5k revs. then hold at 20 psi and boost nicely as a 265 bhp car should, so any ideas with this? i have changed the n75, its got a induacton kit so its all clean. im pulling my hair out thinking what it can be. any help would be great.