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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: Subaru

Why Your WRX STI Knock Sensor Shows False Positives After Stage 2

Your Stage 2 WRX STI is throwing knock counts on premium fuel, but the sensor might be lying to you. False knock detection from mechanical noise looks different in the data than actual detonation.
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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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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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AFR AFR monitoring AFR tuning APR intercooler baseline diagnostics boost control boost pressure charge air temperature Civic Type R datalog analysis datalogging data logging datalogs detonation dyno testing dyno tuning E85 tuning ECU tuning EJ257 engine damage engine knock engine tuning false knock detection heat soak Honda Civic Si Ignition Timing intake air temperature intercooler knock retard knock sensors pressure drop seasonal tuning spring tuning Stage 2 stock turbo Subaru tuning timing advance timing maps timing retard turbo miata turbo tuning VQ37VHR wastegate duty cycle WRX diagnostics WRX STI

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