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Supercharger Calculator

2026-09-27 6 min

Supercharged power estimate from NA baseline, boost and charge cooling — Roots, twin-screw and centrifugal.

Supercharged Power
474 hp
Gain
124 hp

Calculator

NA Power(hp)
hp
Boost(psi)
psi
Charge Cooling Eff.(%) Help
%

Non-IC ~0–30 · IC ~60–80

Results update live as you type

Live statistics

Supercharged Power

474 hp

Gain

124 hp

Results

Optimal

Supercharged Power

474hp

Gain

124hp

Planning estimate from standard automotive formulas. Validate with dyno, timeslip or datalog data when precision matters.

Visualizations

Results overview

474.4Supercharged Power
124.4Gain

Supercharged Power vs. NA Power

Supercharged Power

474.4hp
01,000

Formula

Density gain identical to turbos, minus the crankshaft power the blower itself consumes (~1.5 hp per psi on typical V8 kits).

HP = NA × PR × cooling factor − parasitic (1.5 hp/psi)

Variables

SymbolNameUnitDescription
NABaselinehpUnblown power
PRPressure ratio:1From boost
parasiticDrive costhpBelt-driven penalty

Explanation

Superchargers trade instant response for belt drag — net gain still dwarfs the cost above ~5 psi.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Record the inputs.

NA Power:350 hp
Boost:8 psi
Charge Cooling Eff.:60 %
Result: 3 inputs ready
Step 2

Apply the formula.

HP = NA × PR × cooling factor − parasitic (1.5 hp/psi)
Result: Primary result = 474 hp
Step 3

Read every derived output.

Supercharged Power:474 hp
Gain:124 hp
Result: Supercharged Power = 474 hp
Final Answer
474

Worked Examples

See how the calculator works with different scenarios.

Scenario

350 NA, 8 psi, 60% cooling.

Inputs

NA:350 hp
Boost:8 psi
Cooling:60%

Calculation

PR = 1.544; 350 × 1.544 × 0.90 − 12 = 474

Result

≈474 hp (+124).

Interpretation

Classic TVS street-blower outcome on pump gas.

Understanding Your Result

Your Result: Supercharged Power: 474 hp

What This Means

Expected blown output net of drive losses.

Why It Matters

Compares blower kits honestly against turbo alternatives (no free lunch, no lag).

Professional Interpretation

Treat the primary result as a planning estimate, then validate on a dyno, at the track, or with logged sensor data. If measured numbers disagree by more than ~10%, re-check inputs (units are the usual culprit) before changing parts.

Recommendations

  • •Double-check units on every input before trusting the result
  • •Compare against the worked example below to sanity-check magnitude
  • •Validate with measured data (dyno, timeslip, datalog) when it matters

Learn — fuel economy, deeply

Superchargers buy response with belt power — the math nets density gain against drive cost.

1 · Where the gallon goes (energy path)

Engine heat

60–70% lost

Coolant + exhaust carry most energy away. Hybrids recover some via Atkinson cycle + regen.

Driveline

5–15% lost

Transmission, differential, accessories. CVTs and 8–10 speed autos lose less.

Aero drag

∝ v²

Doubles from 55→78 mph. Roof boxes hurt more than trunks.

Rolling + brakes

10–20%

Tires, weight, stops. Regen braking (hybrid/EV) reclaims city braking energy.

4 · Measure like a pro (the 3-tank protocol)

  1. Fill to first click at the same pump, record the odometer (Tank 0).
  2. Drive normally for 2–3 tanks; always refill to first click at the same pump.
  3. MPG = total miles ÷ total gallons across all tanks — averaging kills pump-click noise.
  4. Cross-check with the trip computer; a persistent >10% gap means the computer needs calibration — or the car needs service.
  5. Log with an OBD-II dongle for per-trip MPG if you want to isolate commute vs. highway behavior.

Practical Tips

  • •Start from the default values — they describe a typical combination
  • •Use the sensitivity chart to see which input moves the result most
  • •Keep units consistent (all inches or all mm, never mixed)

Common Mistakes

Mixing units (inches with mm, psi with kPa)
Convert every input to the unit shown on its field before calculating.
Trusting a single output blindly
Cross-check with the worked example and, when it matters, a dyno or datalog.

Assumptions

This calculator makes the following assumptions to provide estimates:

Steady-state model: Formulas assume stabilized conditions; transients, heat soak and traction limits are excluded.
Standard factors: Empirical constants (BSFC, VE, drivetrain loss) use typical values — your combination may differ.

Limitations

Be aware of these limitations when using this calculator:

Estimate, not measurement: Predictions carry real-world scatter of roughly ±5–15% depending on the model.
No transient effects: Shift time, wheelspin, spool lag and heat soak are not modeled here.

Frequently Asked Questions

Answers to common questions about this calculator.

Roots vs centrifugal?
Positive-displacement gives instant low-end; centrifugal builds with RPM like a belt-driven turbo.
Parasitic loss real?
Yes — 30–80 hp at high boost. It’s already subtracted here.

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Related Guides

Deepen your understanding with these educational resources.

Glossary

Technical terms used in mortgage calculations explained in plain language.

MPG
Miles per gallon. Distance travelled per gallon of fuel; higher is better. US gallon = 3.785 L.
L/100 km
Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.
MPGe
Miles per gallon-equivalent. EV metric: miles travelled on 33.7 kWh (energy of 1 gal of gasoline).
CAFE
Corporate Average Fuel Economy — US fleet-average efficiency standard enforced by NHTSA.
Rolling resistance
Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.
Aerodynamic drag
Air resistance growing with the square of speed — why highway MPG falls fast above 60 mph.
Hypermiling
Driving techniques (coasting, steady speed, anticipation) that maximise real-world MPG.
OBD-II
On-board diagnostics port. Scanners and dongles read live MPG, fuel trim and fault codes.

Authoritative References

Trusted sources and standards referenced by this calculator.

Applicable Standards

EPA Fuel Economy Testing (40 CFR Part 600)CAFE — Corporate Average Fuel Economy Standards (NHTSA)WLTP — Worldwide Harmonised Light Vehicle Test ProcedureSAE J1321 / J1711 — Fuel consumption test proceduresISO 2575 — Road vehicles symbols & efficiency markings

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