EJ257 Archives

Previously we had dyno tested and tuned Project STI at Church Automotive testing. Although our car made a pretty impressive 501 whp and 487 lb/ft of torque our power peaked…

View Post

Rodger Clark Motorsports Subaru EJ Low Temperature Opening Thermostat

Posted on October 19, 2022October 27, 2022
byMike Kojima

We had noticed that the coolant temperature of Project STI was pretty hot considering that the car had a big CSF radiator and a Greddy oil cooler, in fact, the…

View Post

IAG’s New Easy Plug and Play Drive By Wire Big Throttle Body for the EJ257.

Posted on August 4, 2022August 5, 2022
byMike Kojima

We previously had gotten an IAG Performance big throttle body for Project STI, although it was a nice piece it was not exactly user-friendly. You had to get the drive-by-wire…

View Post

Project GD STI, Out with the Old and in with the New!

Posted on August 2, 2022August 3, 2022
byMike Kojima

It is time for us to swap out our damaged EJ257 and install our IAG 700 engine. We spent a lot of time waiting on parts to finish the job,…

View Post

Nightmotorsport Air Oil Separating Billet Valve Covers for Subaru EJ Engines

Posted on April 26, 2022April 28, 2022
byMike Kojima

Subarus like all flat engines, blow a lot of oil out of the crankcase in their blowby gasses. This is always a problem with performance flat engines like Porsche or…

View Post

Freeing up the EJ257 Intake Flow with Process West and IAG

Posted on April 24, 2022
byMike Kojima

We were planning to run a Cosworth intake manifold on Project STI’s IAG motor but we were unable to find one for a decent price as they have been discontinued…

View Post

Project GD STI, Getting Ready For the Engine Swap

Posted on January 30, 2022
byMike Kojima

In our previous articles, we covered the build-up of our EJ257 engine collaboration with IAG Performance. Now we have been collecting a bunch of parts to make our installation go…

View Post

Project GD STI, IAG’s new high capacity EJ Oil Pump!

Posted on November 28, 2021
byMike Kojima

IAG has just dropped their Stage 1 and Stage 2 oil pumps for all EJ engines. We will be using their Stage 2 pump on our own Project GD STI.…

View Post

Solving Subaru EJ Oiling Issues for Good with IAG Performance!

Posted on October 19, 2021
byMike Kojima

Subaru EJ engines are known to have oiling problems caused by the oil pan and pick up. We personally know quite a few people who have lost engines on the…

View Post

Project GD Subaru STI, Building the Engine Part Five: Final Engine Assembly With IAG.

Posted on June 20, 2021
byMike Kojima

In our last story, you saw how IAG Performance assembled our short block with meticulous care. Now our engine travels to the second of IAG’s two cleanrooms for final assembly.…

View Post

Project GD Subaru STI, Building the Engine Part Four: Assembling the Short Block With IAG.

Posted on June 13, 2021
byMike Kojima

If you have been following our EJ257 engine build series with IAG Performance, you have been able to look inside IAG’s incredible attention to detail in machining and parts selection. …

View Post

Project GD Subaru STI: Building the Engine Part Three, Cylinder Head Technology With IAG Performance.

Posted on May 23, 2021June 9, 2021
byMike Kojima

The cylinder head is one of the most important parts when it comes to making power in an engine. Although headwork is less critical in a turbo engine than a…

View Post

Project GD Subaru STI: Building the Engine Part Two, Bottom End Bits With IAG Performance.

Posted on May 2, 2021June 9, 2021
byMike Kojima

In part one of our series of building the motor for Project GD STI we talked about the IAG Performance engine cases we are using and all of the prep…

View Post

Project GD Subaru STI, Building the Engine Part One, Prepping the Case With IAG Performance.

Posted on April 13, 2021June 9, 2021
byMike Kojima

It had to happen eventually. Our Project STI was running great. We had plans to build the engine as our 400 whp was past the limit that a stock bottom…

View Post

Project Subaru GD STI, Improving The Ignition System!

Posted on September 19, 2019September 24, 2019
byMike Kojima

Nowadays it is hard to improve the ignition on late model cars. New car ignitions, especially ones with coil on plug systems are more powerful from the factory than racing…

View Post

Tech

5 Performance Car Engines That Suck

Posted on July 25, 2016July 2, 2018
byMike Kojima

5 Performance Car Engines That Suck! by Mike Kojima We are going to go out on a limb and make a lot of fanbois angry. They will call BS and…