A key feature of the (Liquid Propane Injection) system is its ability to inject LPG into the engine's intake manifold in liquid form rather than as a vapor. Liquid Injection Benefits
: You can find downloadable versions on technical repositories like JDMFSM and Scribd .
The LPi system operates as a "master-slave" configuration where the original vehicle ECU continues to manage the engine, while the Vialle LPE unit translates petrol signals into LPG injection pulses.
The “Top” level includes the proprietary Vialle software mapping guide. It’s not about trimming mixture. It’s about injection timing overlap with the petrol injectors. In bi-fuel mode, the system doesn’t switch—it blends during transition. The manual’s “Top” calibration chart shows how to phase LPI pulse width against gasoline pulse width to within 0.2ms for a seamless, driver-invisible handover. Get this wrong, and the customer complains of a “hiccup” at 3,500 rpm.
High-priority grounding is typically required at the front of the engine using M6 nuts.