If your engine has an LPG (liquefied petroleum gas, often called propane in the US) system alongside its normal gasoline injection, the Nexus LPG function stops the two from fighting each other. When the LPG select switch is on, the ECU disables the gasoline injectors and the fuel pump, so the LPG system can run the engine on its own.
Setting it up
- Wire the LPG select switch to a spare input. Either an SPI or an AVI (analog voltage input) will do.
- In NSP, enable the LPG function and assign that input under Connections as the Switch Input.
- Flip the switch with the key on and watch the switch state change in NSP before trying it with the engine running.
Things to think about
- The ECU is only turning the gasoline side off. Fueling on LPG is handled by the LPG system, so that side needs its own setup and tuning.
- Changeover behavior depends on the LPG kit. Test the switch from gasoline to LPG and back at idle before trying it on the move.
- Ignition timing needs are often different on LPG. If you'll switch fuels regularly, talk to us about how to handle timing for both.
Questions about a dual-fuel setup? Book a free 30-minute consultation.
