Which system is typically only used on fuel injection systems?

• A. Wet system
• B. Dry system
• C. Plate system
• D. Direct port wet system

Answer: (B)

Dry nitrous systems add only nitrous oxide and rely on the engine’s fuel delivery to meter the extra fuel, so the air-fuel mix stays correct. This precise fuel metering is easiest to achieve with electronic fuel injection, which can adapt fuel flow in real time. Carbureted engines don’t offer the same level of metering control, making a dry setup impractical or unsafe there. Wet nitrous systems, including plate and direct-port configurations, supply both nitrous and fuel and can work with either EFI or carbureted engines, but they don’t rely on the engine’s fuel metering in the same way. So the system typically used only with fuel injection is the dry nitrous system.