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Tuning Knowledge
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Articles for: fuel system

WRX Stage 2 vs Stage 3: Which Boost Level Actually Makes Sense?

Most WRX owners jump straight from Stage 2 to Stage 3, missing the sweet spot in between. Stage 2.5 builds deliver 20-22 PSI boost with better fuel flow and fewer headaches than full Stage 3 setups.
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E85 Injector Sizing for Supra: Why 85% Duty Cycle Matters

E85 injector sizing isn't about maximum flow capacity. Most Supra owners oversize by 30-40%, which destroys atomization and makes tuning a nightmare.
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Why WRX Knock Sensors Go Crazy on E85 (It’s Not Octane)

Your WRX's knock sensor lighting up on E85 despite ethanol's 105 octane rating? The problem isn't octane, it's tuning. E85 requires completely different AFR targets and timing maps than pump gas.
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