BMW N54 · N55 · B58 · S54 · S55 · S58 · S63 · S65 · S85
Plan the build before you buy the parts.
TorqPlan turns a wheel-horsepower target into a staged, costed parts plan — with the supporting mods and reliability warnings most build lists leave out.
- Platforms
- 9
- Vehicle applications
- 105
- Catalogued parts
- 386
- Build configurations tested
- 39K+
What you get
A technical plan, not a parts-shop wish list
Required vs. supporting
Every recommendation is separated into what your target demands, what keeps it alive, and what is simply nice to have.
Honest warnings
Fuel, turbo, engine, clutch, and transmission planning thresholds — flagged before you spend.
Budget reality check
Estimated parts ranges by category, with installed items removed so you see what is actually left to buy.
Fuel-aware targets
Pump 91 through E85 changes the ceiling and the fuel-system requirements. The plan changes with it.
Engine coverage
Supported engine coverage
Reference only — you don’t select an engine here. Start a build with your year and vehicle, and TorqPlan identifies the correct engine/platform automatically.
N54 3.0L twin-turbo
Twin small turbos with a robust factory bottom end for its era; engine condition and torque delivery become increasingly important at higher output.
N55 3.0L single-turbo
Single twin-scroll turbo, valvetronic head. Very reliable at moderate power, turbo-limited early.
B58 3.0L single-turbo
Closed-deck block, integrated exhaust manifold, strong stock fueling. Big gains on calibration alone.
S58 3.0L twin-turbo (M)
BMW M's closed-deck twin-turbo six with a forged crank, indirect water-to-air charge cooling and a factory-high output level. It starts well above the non-M B58, so calibration alone moves it less than on a 340i — heat management and fuel delivery become the practical planning constraints first.
S54 3.2L naturally aspirated (M)
BMW M's individual-throttle-body naturally aspirated straight six. There is no turbo, no charge-air circuit and no direct injection, so airflow gains come from intake, head/exhaust flow and calibration — and any large step in output means adding forced induction, which is a different project entirely.
S55 3.0L twin-turbo (M)
BMW M's twin-turbo straight six for the F8x M cars. It leaves the factory with meaningful calibration headroom, but charge-air temperature and fuel delivery become the practical planning constraints well before the block does.
S85 5.0L naturally aspirated V10 (M)
BMW M's individual-throttle-body naturally aspirated V10. There is no turbo, no charge-air circuit and no direct injection, so airflow gains come from intake, header/exhaust flow and calibration. Any large step in output means adding a belt-driven forced-induction system, which is a different project entirely.
S65 4.0L naturally aspirated V8 (M)
BMW M's individual-throttle-body naturally aspirated V8 for the E9x M3. There is no turbo, no charge-air circuit and no direct injection: airflow gains come from intake, plenum, header/exhaust flow and calibration, and a large step in output means adding a belt-driven forced-induction system.
S63 4.4L twin-turbo V8 (M)
BMW M's direct-injected twin-turbo V8 with the turbochargers mounted between the cylinder banks. It leaves the factory with meaningful calibration headroom, but charge-air temperature, fuel delivery and traction become the practical planning constraints well before the block does.
Planning maxima describe how far TorqPlan's catalogued build path goes for a platform — they are not claims about a universal engine limit. Factory power is shown per vehicle and model year as OEM crank horsepower, which is not the same unit as a wheel-horsepower target.
Audi, Mustang, Corvette and Honda platforms are next — the data model is already built for them.
Know the number before you spend
Two minutes of inputs beats a garage full of mismatched parts.