Swap hard limits

Not a parts list. A map of what typically becomes the bottleneck as power and grip increase.

Constraint

Thermal

Underhood temps and airflow are a major limiter before “radiator size”.

What fails first

heat soak, fan efficiency, wiring insulation, brake fluid boiling, power steering temps.

Constraint

Traction multiplies breakage

The same HP is much harder on parts when the car hooks.

What fails first

axles, differential, driveshaft joints, subframe bushings, wheel hop damage.

Constraint

Control strategy

Electronics are a hard limit for some swaps, not power.

What fails first

immobilizer/DBW/CAN integration, sensor strategy, inconsistent power distribution.

Use with

Power levels + tools

Combine hard-limit thinking with tiered requirements.