A sequential kit replaces the gas-and-air mixer used in a conventional kit with gas injectors. Like petrol injectors, they deliver a calculated amount of gas to each cylinder at the right moment.
The result is performance close to a petrol car, smooth pickup and steadier running. Sequential kits are available for 3, 4, 6 and 8 cylinder engines, for both CNG and LPG.
| Feature | Sequential kit | Conventional (open loop) kit |
|---|---|---|
| How gas is delivered | Individual gas injectors, one per cylinder | Gas flows to the engine according to demand, through a mixer or emulator |
| Drivability | Close to petrol | Good, but more noticeable difference from petrol |
| Adjustment | Calibrated by the kit ECU | Needs regular adjustment to perform at its best |
| Engine lamp | Less likely to be triggered by the kit | May show a lambda (O2 sensor) error because the system does not read lambda |
| Suits | Most modern multipoint injection cars | Older or basic engines |
Direct injection petrol engines (T-GDI, FSI, EcoBoost, TSI and similar) spray fuel straight into the cylinder, so they need a special kit.
A direct injection kit runs the engine mainly on gas while a small share of petrol is still injected to protect the direct injectors. It is designed for 3, 4, 6 and 8 cylinder engines and uses a single-stage reducer.
Not sure whether your car has direct injection? Send us the model and year and we will confirm.
See the makes we fit on our Brands page, or browse spare parts.
Share your car model and how you drive. We will suggest the right kit and tank and give you a clear quote.