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Articles for: Chassis Tuning

What AFR Should You Run on E85? Honda K20 Data Shows Why 10.5 Kills

Running 10.5 AFR on E85 doesn't make your K20 safer than 11.5, it's killing it differently. Cylinder wash and oil dilution from over-fueling destroys engines just as dead as lean conditions, just slower.

Why Your First Spring Drive is Destroying Your Engine (Data)

That first warm spring drive feels amazing until you check your knock logs. Your ECU just recorded 47 knock events because last year's tune is fighting this year's atmospheric conditions.

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.

Why Identical Miata Turbo Kits Make 170-220hp: Hidden Variables

Two identical Miata turbo setups can vary by 50hp despite using the same kit and tune. Factory compression ratios, engine tolerances, and hidden fueling variables create this frustrating power spread.

Why E85 Rich Spikes Kill Engines (Not Lean AFRs)

Everyone fears lean AFRs on E85, but the real engine killer is rich transients during fuel transitions. Those 12.5-13.5 AFR spikes wash cylinder walls and destroy ring seal faster than any lean condition.

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.

Why Spring Temperature Changes Wreck STI Tunes (Data Analysis)

Temperature swings of just 20°C can shift your STI's knock threshold by 2-3 timing degrees, turning a safe winter tune into engine damage. Here's what your datalogs are actually telling you about seasonal temperature changes.

How to Tell if WRX Boost Creep is Hardware or Tune Issues

Boost creep diagnosis on Stage 2+ WRXs comes down to three critical datalog parameters that most owners check in the wrong order. Here's how to read your logs to identify the real culprit before you start throwing parts at the problem.

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.

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.

Do Aftermarket Boost Controllers Actually Improve STI Response?

Stock STI boost control overshoots target pressure by 2-4 PSI during gear changes, creating hidden stress on internals. Aftermarket controllers maintain precise target pressure, eliminating these damaging spikes.

Why Your WRX STI Wideband Shows 11.5 AFR But ECU Logs 12.8

Stage 2 WRX STI builds often show AFR differences between wideband gauges and ECU logs, with readings varying by 1-2 points. The discrepancy comes down to sensor placement, calibration drift, and response timing, not faulty hardware.

Tuning Knowledge & Insights

Articles for: Chassis Tuning

Tuning Knowledge
& Insights