No No you got a confusion there! Let me state the tyes of kits available:
1. Open loop kit: The most basic equipment and the cheapest too. It is similiar to the carburetttor in older cars. The air-fuel mixture has to be adjusted or tuned by the mechanic. Also, the exact ratio that is needed for your car and your local conditions may change according to both external factors like outside temperature etc as well as internal factors like engine temperaure, load etc. This requires you to frequently visit the mechanic or at least get the car tuned as per the requirement. Only an expert convertor can give you a good state of tune. Hence, pickup and performance is a difficult thing to achieve.
2. Closed loop kit: A closed loop system is mainly achieved by adding the O2 sensor or the Lambda, as it is commonly known with an optional timing advancer to the existing open-loop kit. This can enable the air-fuel mixture addjustment automatically, as the demand and conditions go. This is presently a good option against the higher priced sequential kits if you are concerned about the cost. Using a closed loop kit, you can get better economy, better performance compared to an open-loop system.
3. Sequential system: This is the most technologically advanced conversion available aftermarket as of today. They are similiar to the MPFi system in your car. It uses a separate microprocessor based ECU, and taking data from mainly the O2 sensor, alongwith the other conditions like engine temp, load etc , it can deliver precise amounts of gas at the right time, thus giving you efficient combustion. In a sequential kit, performance loss is usually very less. Precise fuel delivery also ensures more mileage.
Where there is a wheel, there is a way!
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