Your account is active in another window or device. Close the other session to continue using AlphaX Tuning Sim.
Active Session ID: —
Higher numbers = more fuel. Adjust to hit target AFR.
Commanded Air/Fuel Ratio. Core part of the Speed Density equation.
Multiplier at each IAT. 1.0 = no change, 0.9 = −10%, 1.1 = +10%.
Fuel multiplier on cold start. 1.0 = no correction at operating temp.
Return style: rail rises 1:1 with boost — injector differential stays constant. Returnless: fixed rail pressure, injector flow drops under boost.
Degrees Before Top Dead Center. Too much advance causes knock.
Sets coil topology, recharge time, and melt behavior.
Wider gap = needs more dwell to fire. Under boost, effective gap shrinks 0.005" per 10 psi — tighter gaps recommended on boosted builds.
Degrees of retard at each IAT. 0 = no retard.
Coil charge time. Low voltage during cranking may cause weak spark.
Wet shot: fuel solenoid handles base enrichment. ECU VE comp adds on top.
Extra fuel when N2O is active. Dry = primary comp. Wet = supplement on top of fuel solenoid.
Degrees pulled from commanded timing when N2O is active.
Positive degrees of intake cam advance. Interpolates absolute "In_X" engine maps.
Negative degrees of exhaust cam retard. Interpolates absolute "Ex_X" engine maps.
Continuous VVT phase angles are controlled via the 9x9 tables.
Higher Kp = faster response. Ki eliminates steady-state error. Kd damps overshoot. Live display shows actual° / target° when enabled.
Commanded wastegate solenoid duty cycle (0–100%). Higher duty = more boost. Requires a turbocharger mod installed. In Closed-Loop Boost mode this table acts as the feed-forward base; the PID trims on top.
Simulates a timing light check. Engine start is disabled while active.
Alt pressure rises +0.5 V per 1000 RPM. PID controls duty to hold target voltage.
Sets the 16-point RPM and MAP (load) axes for the VE, AFR, and Timing tables. WG Duty table columns (RPM) also update. The WG Duty row axis (TPS) is unaffected.
Note: existing tune values are interpolated/extrapolated onto the new axes. Values beyond your current range are linearly extrapolated from the edge trend.
Actual throttle % when duty curve reads 100%.
Idle control disengages above Target RPM + this value.
Idle RPM target by coolant temperature. Runs higher when cold.
% of Maximum Idle TPS% to command at each coolant temperature.
Uses ignition timing to maintain target idle RPM for faster corrections.
Throttle position (air) during cranking. Higher when cold to overcome friction.
Fuel multiplier applied immediately after cranking ends. 1.0 = no enrichment.
Engine cycles (720° each) for enrichment to decay from curve value to 1.0×.
TUNER WARNING: Extreme mods like heavy cams will increase idle vacuum penalty (raises base MAP), which can stall your engine! You will need to tune your low-RPM fuel/timing and raise target idle RPM to compensate.
Test your launch settings in the garage. When active, the engine will limit to Launch RPM at full throttle even in Neutral.
Ambient conditions used as the baseline for all simulations — dyno pulls, drag runs, and the garage physics loop.
Affects all displayed temperatures, pressures, and speed. AFR/Lambda can be toggled separately by clicking the gauge.
Sets base IAT for the physics loop.
Affects MAP ceiling and airmass scaling (altitude).
Used for dyno correction factor (SAE / STD).
When enabled, engine starts cold at ambient temp and warms to 90°C. Disabled = ECT locked at 90°C.
Adds exhaust transport delay to AFR display (300ms at idle, 0ms at 3500 RPM) and ±3% combustion variance to physics at low RPM.
Hold to Engage: hold the button while the starter cranks; release after engine fires.
Floating counter shown in all views when the engine is knocking. In Advanced Mode use the Knock Control tab instead.
Set ratio to 0 to disable a gear.
Advanced Mode activates automatically when your purchase is detected at login. Click Here to get Advanced Mode →