AFR tuning - Torque Metrics

VQ37 Factory ECU vs Standalone: When to Spend the $3000

The factory VQ37 ECU handles 500+ wheel horsepower without breaking a sweat. That $3000 standalone makes sense for race builds, but most street cars are paying premium for features they'll never use.

Why Aftermarket Intercoolers Cause False Knock in STI Engines

Your new FMIC dropped intake temps by 20°C but now your knock sensors are going crazy on perfect AFRs. The problem isn't fuel or timing, it's vibration frequency changes that confuse your knock detection system.

What AFR Should I Target for E85? Why 10.5:1 Is Wrong

That magical 10.5:1 AFR everyone targets on E85 is costing you power and reliability. Real E85 varies dramatically in ethanol content, and your tune needs to adapt with it.

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.

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.

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.

Why Did My Intercooler Upgrade Kill Power? Stage 2 Tuning Fix

Your new front-mount intercooler is working perfectly, dropping intake temps 8-11°C below your old setup. The problem is your ECU is still running a tune calibrated for warmer, less dense air.

Why 11.8 AFR on E85 Melts Honda Civic Si Pistons

That 11.8 AFR reading looks safe, but it's actually the most dangerous zone for E85 Civic Si builds. The uneven burn patterns in this range create hotspots that melt pistons faster than lean conditions.

FA24 Knock Detection: Why the 2022+ WRX Tunes Differently Than EJ

The FA24's direct injection system changes everything about knock detection compared to EJ engines. Most tuners still use EJ strategies, leaving power on the table.

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.

Tuning Knowledge
& Insights

Articles for: AFR tuning

VQ37 Factory ECU vs Standalone: When to Spend the $3000

Why Aftermarket Intercoolers Cause False Knock in STI Engines

What AFR Should I Target for E85? Why 10.5:1 Is Wrong

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

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

E85 Injector Sizing for Supra: Why 85% Duty Cycle Matters

Why Do Stage 2+ WRX Builds Fail More Often Than Stage 1?

Why WRX Knock Sensors Go Crazy on E85 (It’s Not Octane)

Why Did My Intercooler Upgrade Kill Power? Stage 2 Tuning Fix

Why 11.8 AFR on E85 Melts Honda Civic Si Pistons

FA24 Knock Detection: Why the 2022+ WRX Tunes Differently Than EJ

Common Tuning Myths That Your Datalogs Will Prove Wrong

Tuning Knowledge & Insights

Articles for: AFR tuning

Tuning Knowledge
& Insights