Technical Info

Scored Sixes: Porsche 9A1 Bore Scoring Explained

Porsche fixed a lot with the 9A1. Bore trouble wasn't completely one of them, but it's not the M96 story either.

Scored Sixes: Porsche 9A1 Bore Scoring Explained

Porsche fixed a lot with the 9A1. Bore trouble wasn't completely one of them, but it's not the M96 story either.

Closed Deck vs. Sleeved Blocks: What Your EJ257...

Closed decking and sleeving solve different problems. Here's what each one actually does to an EJ block, and how to pick without buying into the hype.

Closed Deck vs. Sleeved Blocks: What Your EJ257...

Closed decking and sleeving solve different problems. Here's what each one actually does to an EJ block, and how to pick without buying into the hype.

Ethanol Edge: E85 vs. Race Fuel

Both buy you knock resistance. They do it differently, cost differently and fail differently. Here's how to pick.

Ethanol Edge: E85 vs. Race Fuel

Both buy you knock resistance. They do it differently, cost differently and fail differently. Here's how to pick.

Fuel Feud: Direct vs. Port

Where the fuel goes changes everything: knock limits, carbon, LSPI and how far your fuel system can take you.

Fuel Feud: Direct vs. Port

Where the fuel goes changes everything: knock limits, carbon, LSPI and how far your fuel system can take you.

Dry sump oil pump mounted on a Subaru EJ engine block with toothed drive pulley, timing belt and AN fittings

Sump Sense for Subarus

A boxer has oiling problems an inline engine never thinks about. A dry sump solves most of them, and brings a few of its own.

Sump Sense for Subarus

A boxer has oiling problems an inline engine never thinks about. A dry sump solves most of them, and brings a few of its own.

Subaru EJ intake manifold on a flow bench test setup

Subaru Intake Manifold Dope

Subaru EJ Intake Manifold Flow Bench Results – Real SuperFlow 1020 data at 28" H₂O: averages from 290 CFM (stock 09 WRX) to 381 CFM (ASF Monstrosity reversed). Highlights velocity-preserving...

Subaru Intake Manifold Dope

Subaru EJ Intake Manifold Flow Bench Results – Real SuperFlow 1020 data at 28" H₂O: averages from 290 CFM (stock 09 WRX) to 381 CFM (ASF Monstrosity reversed). Highlights velocity-preserving...