I have a 2016 C7Z A8 on the dyno that has a BTR Stg II cam, 10% OD crank pulley, 2.3 upper, Cordes CAI, flex and meth.
Im having an issue where boost gets pretty wavy about 5000rpm, and because of that, its not making the power it should.
Right now I'm just running in on straight 91oct, and its only making 600whp. However, torque is up at 700ft/lbs which seems reasonable. Boost starts at around 12.5psi when I get on throttle and drops to abour 10psi by 6500rpm. You can really see in the log how bad the boost curve gets.
I have put the shortest belt possible on it. In fact I even modified the tensioner in order to get the shortest belt possible on it.
I've messed around with SOI and virtual torque and nothing made much of a difference.
Attached are the current tune and log.
c7z_btrII_91oct.hpt
c7z_boostissue.hpl