Torque Metrics

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.

Is Stock ECU Tuning Better Than Standalone for Stage 2 Supras?

Most Supra owners assume a standalone ECU is mandatory for serious power. Real dyno data shows the stock ECU with piggyback tuning often delivers smoother power delivery and nearly identical numbers for Stage 2 builds.

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 Turbo Miata Builds Fail: The Wastegate Preload Problem

Most turbo Miata builds grenade because owners ignore wastegate actuator preload, causing dangerous overboost spikes under load. Your boost control setup matters more than peak power numbers.

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.

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.

E85 vs Pump Gas AFR: Why 11.5:1 Is Wrong for Both Fuels

Most tuners run 11.5:1 AFR on both E85 and pump gas, missing the optimal targets for each fuel. E85 makes peak power at 10.8-11.2:1 with aggressive timing, while pump gas needs 11.8-12.2:1 for knock resistance.

Tuning Knowledge & Insights

Tuning Knowledge
& Insights