Forced Induction¶
Turbochargers and superchargers cram in more air than the engine could draw on its own. Boost overrides manifold pressure — and brings spool, lag, and heat to manage.
What it is¶
Forced induction pumps the intake charge above atmospheric pressure, packing more air mass into the cylinder for more power. Engone offers turbocharger, supercharger, and twin setups. The tunable parameters include max boost, the boost curve, turbo inertia (which governs spool and lag), the A/R ratio, the wastegate spring, and the intercooler.
A key mental model: boost overrides MAP, not airflow directly. The turbo raises manifold pressure; the engine then breathes that denser air through its normal VE, and speed-density accounts for the rest.
Why it matters¶
- Spool / lag — a turbo's inertia means it takes time to build boost. Low inertia spools fast (responsive) but may not sustain top-end; high inertia lags low down but holds big boost up top.
- A/R and wastegate spring shape the boost curve and set the floor boost the wastegate allows.
- Heat — compressing air heats it (IAT rises), which lowers the knock limit. The intercooler cools the charge back down, restoring air mass and knock margin.
How to tune it¶
Pick a turbo whose spool characteristics match your goal, set max boost within the engine's knock and octane limits, and use an intercooler to keep IAT in check. Then tune fuel and timing for the boosted cells — they're the highest-load, highest-risk part of the map.
Watch out
Boost stacks cylinder pressure and heat — exactly what causes knock. Lower compression, raise octane, richen the mixture, and pull timing as you add boost.
In the game¶
Forced-induction parts are on the Setup page (and require a compatible exhaust). Watch MAP climb above atmospheric and IAT rise as boost builds; see Boost Control for managing it.