GM LS Wheel Horsepower Calculator

Built for tuners. Uses airflow → fuel → power with BSFC and drivetrain correction.

Engine & Airflow

Displacement (LS)

Target RPM (peak power)

Volumetric Efficiency @ 6000 RPM (%)

Intake Pressure Drop (psi)

Configuration

Boost (psi)

Intercooler Effectiveness (%)

Compressor Efficiency (%)

Environment

Altitude (ft)

Ambient Temp (°F)

IAT at Manifold (°F)

Apply intercooler to IAT

Show SAE J1349 corrected estimate (info only)

Fuel & BSFC

Fuel

WOT AFR Target

BSFC (lb/hp·hr)

Mechanical Efficiency (%)

Drivetrain

Transmission

Converter Slip @RPM (%)

Drivetrain Loss (%) (override)

If left blank, loss is estimated: 2WD M6≈15%, 2WD A≈18% (+slip), 4x4 A≈22% (+slip).

Cam/Heads (Optional Refinements)

Avg Intake Flow @.600" (cfm)

Cam Aggressiveness

These inputs nudge VE around the target RPM (+0 to +8% typical).

Outputs

Wheel Horsepower—@ — rpm

Crank Horsepower—(before drivetrain)

Airflow—lb/min @ MAP — psia

Density—lb/ft³ @ IAT — °F

No calculator is perfect. This tool uses widely accepted engineering approximations (ideal gas, BSFC model). Always validate with real dyno data and logs.