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Tuning Knowledge
& Insights

Learn the fundamentals
behind performance tuning.
Explore the newest articles on tuning, diagnostics,
and what your logs are actually telling you.

Articles for: EJ257 Performance

Why Your Dyno Tune Isn’t Telling the Whole Story

That perfect dyno pull doesn't capture the knock events at 3000rpm or AFR drift during daily driving. Continuous data monitoring reveals what's actually happening to your tune between dyno sessions.
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Why Your Car Loses 20% Power in Summer Heat (And What to Fix)

Your knock threshold drops from -6 to -11 when ambient temps hit 35°C. That intercooler upgrade means nothing if your ECU is pulling 4° of timing to prevent knock.
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Why Do Stage 2+ WRX Builds Fail More Often Than Stage 1?

Stage 2+ WRX builds fail at a 40% higher rate than stage 1 setups, and the data shows why. Most owners upgrade hardware without understanding that ethanol content changes AFR targets dramatically.
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Should You Tune Stock Parts First? Spring Tuning Season Truth

Most people blow their spring tuning budget on hardware first, then wonder why their gains are disappointing. The data shows baseline tuning and knock optimization deliver bigger returns than bolt-ons on stock setups.
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Why Cheap ECU Tunes Cause Expensive Engine Damage

A $300 tune that destroys your $8,000 engine isn't a bargain. Learn why proper AFR monitoring and knock detection during the tuning process can save your turbocharged build from expensive damage.
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Common Tuning Myths That Your Datalogs Will Prove Wrong

Forum wisdom says lean AFR equals more power and advanced timing is always better. Your datalogs tell a different story entirely.
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What’s the Optimal Ignition Timing for E85 on Supra and 350Z Builds?

Most tuners push ignition timing too hard on E85, assuming more is always better with race fuel. The data from Supra and 350Z builds tells a different story about where peak torque actually lives.
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Why 11.5 AFR Kills EJ257s: The Intake Temperature Factor

That Stage 2 tune with 'conservative' 11.5 AFR targets? It's murdering EJ257s across the country because tuners ignore intake temperature compensation. Here's why your safe ratio becomes lean death when IATs climb.
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