The last time I was at the dyno was just under two years ago. Back then I was at 10-11 psi, and I put down 206 whp / 178 ft-lbs.
Since then, I've had a better 3" full exhaust fabbed in place of my old 3" dump before the rear axle, and I've also done a lot of various maintenace items like fuel filter, spark plugs, etc.
Last but not least, I actually turned the boost down
a hair - so that it was just a solid 10 psi instead of fluctuating up to 11.
I also set up an EBC solenoid connected to a switch in the cabin to allow me to switch between a regular boost setting (10) and a lower conservative psi.
Yesterday the BMWCCA was doing a dyno day so I attended and did a couple quick runs.
Stock 1.6 - 130k miles (turboed for 30k now)
Greddy TDO4H 15G on Greddy manifold
CXR intercooler / custom 2.5" piping
No AFM -converted to MAP
DYIPNP Megasquiqrt / 460cc RX-7 injectors (70% duty cycle)
Run 1 the dyno guy was having issues getting rpm signal so it's not on the chart
Run 2: 10 psi flat -207 whp / 208 ft-lb
Run 3 - low boost setting: just barely 7 psi - 186 whp / 180 ft-lb - I really wanted it to be lower, like 5 psi, but I'm having trouble getting the wastegate to go lower.
Run 4 - 10 psi again, but with the silencer insert in the muffler - 193 whp / 199 ft-lb - I run with the silencer in most of the time I'm on the street and was curious how much power it restricted. Turns out it saps ~6%
Don't believe the rpm too much - on the chart it looks like he stopped at 6k but he hit the rev limit of 7200. He was having trouble getting a strong spark signal to read on the dyno and was messing with the calibration in the dyno's computer, so I think the scaling for the rpm is off a bit.
So, 208 ft-lbs is a solid 30 ft-lbs more than back with the old mufflerless dump exhaust!
Overall pretty happy. 3 years and 30k miles turbocharged and the original unchanged 1.6 is still going strong.