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Old 12-27-2020, 07:47 PM   #1
Scooby Specialist
Member#: 459692
Join Date: Dec 2016
Chapter/Region: South East
Location: Hampton Roads Va
2019 WRX STI
silica black

Default OEM bearings with forged rods?

As I have some gift cards burning a hole in my wallet I'm looking forward to the next phase of my build. This is where I'm at with my 2019 STi:

Blouch 20G XTR
Injector Dynamics ID1300s
Cobb Big SF intake with air box
Cobb 3 port EBCS
Cobb LF bypass valve
Cobb flex fuel kit
Grimmspeed TMIC
Grimmspeed catted downpipe
Grimmspeed EWG up pipe
Turbosmart 38mm EWG
Killer Bee holy header

380WHP and 370WTQ on a Dyno Jet

My plan is to pull the motor, delete the air pump, split the case, replace the rods and pistons, and install the motor with a new ACT clutch with streetlite flywheel. My tuner gave me a conservative tune because of the factory shortblock. Is 450-500WHP attainable on a Dyno Jet? I plan on using Manley forged rods and performance platinum series 99.75mm pistons. I will have the machine shop size the bores and gap the rings. Since the car is a DD and lives on E85 should I go with 9.8:1 or stick with 8.5:1?

Do I need to replace the rod bearings? The motor has 30K on it and my past 4 oil analyses have been perfect. It's tempting to replace EVERYTHING but I don't mind saving money where I can. Although I have a feeling y'all are going to tell me to replace the main bearings too. It goes without saying that I would install the OEM bearings back into their original position. Are ARP head studs a necessity? I foresee a retune approaching 25#s of boost. This is just the next step in my build and I strangely look forward to pulling the motor myself. Anyone local to the Hampton Roads aka Coastal Virginia area that wouldn't mind renting me some Company 23 tools feel free to pm me
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undyjr is offline   Reply With Quote