Plox: 280kW ATW @ 28PSI - 492 NM Torque
Model: 92 RS Legacy BC5
Displacement: 2.0l
Mods: gtx3071 gen 1 with mamba twin scroll 0.82 AR housing/ 880cc Side Feeds / bl/bp ts headers with twist adapter / 3Inch with 2 x coby & muffler / 550x230x65 FMIC / vipec i88 / post IC 50/50 water/meth injection / 272 Franklin reground cams / adjustable cam gears
Fuel: BP 98
Top line is 28psi with water meth
Middle is 24ish psi no water meth
Dashed lines are old single scroll gt3076 0.63 housing 23psi no water meth
Couldn't pull any more than 280kw, torque drops off significantly, next to no top end gain adding boost and timing. Injectors weren't the limiting factor (yet), appears there is a airflow restriction.
Pressure testing results (on high boost):
Exhaust port egbp 40psi
pre turbo but post wastegate egbp 35psi
post turbo egbp 5psi
turbo outlet/pre intercooler 34psi
final boost/manifold pressure 28psi
Back to back core vs no core @ 40% open loop wastegate duty test showed 22psi with core 26psi without (so ~4psi of intake pressure drop is the IC, this added 20 degrees of IAT even with WM and made the car run mid 10 afr rather than the normal mid 11, and seemed to bring the boost threshold 200rpm earlier)
I've been "internet" advised IC is to thin and causing a restriction. Any opinions on this?
I have a suspicion the cams aren't what they should be, are a bad grind, or are dialed in wrong.
Any opinions on what could be the restriction or tests to suggest?