Looks like I will soon join the club of YNANSB. Car has 172000 km on the clock, it has seen Canadian winter cold starts, summer road trips, and several track days. I did a compression test on the engine last month and got 130/130/130/127 psi. Looks OK right? Throw more power at it they say. It'd be fun they say.
So I upgraded from a simple BNR16G setup to the following:
Borgwarner EFR 6258 turbo with IWG and .64 housing
Custom T25 up pipe and v-band down pipe
Custom TMIC with Vibrant core (17.75" x 9.85" x 3.5")
3 inch straight through exhaust
DW740 side feed injectors
DW65C fuel pump
On the dyno, car made 283 whp and 320 torque (stock STI reads about 230 whp on this dyno) with 18psi peak tapered to 15 psi. Boost could not be turned higher due to knocks. The tuner thinks the knocks could be the results of a couple factors: 1. I picked up a tank of bad gas; 2. engine health is not the greatest, it doesn't want to make any more power. He also recommended a leak down test.
I got the results yesterday: 7% on cylinder 1, and 10% on cylinder 2~4. Air is leaking to the crank case on all four cylinders. I guess that explains why the car drives and pulls fine, but consumes about 2L of oil over 3000 km, and it doesn't want to make more power.
I am looking into 2 options:
1. Follow Mr Tris' thread, and drop in a brand new OEM short block.
2. Have a localish Subaru builder rebuild my block with Mahle 4032 pistons, king bearings, new OEM crank shaft, etc. This will leave me some head room in case I decide to go with the EFR 7163 down the road.
Before I take the engine out of the car, I would love to hear your opinions and suggestions.
In the mean time, here are some photos of the EFR build.