The terms OBD1 and OBD2 often come up when discussing car upgrades, especially fuel injectors. When it comes to the Acura Integra GSR, understanding the difference between these two generations of injectors is crucial to avoid damaging your car. This article will clarify the distinctions between OBD1 and OBD2 GSR injectors, focusing on the critical factor that determines compatibility: injector resistance.
Injector Resistance: The Key to Compatibility
The primary concern when swapping injectors isn’t the OBD connector type but the injector’s internal resistance. There are two main types of injectors:
- High Resistance (Saturated): These injectors are designed to operate with a continuous flow of current. They are typically found in OBD2 systems. Acura Integra GSRs originally come equipped with saturated injectors.
- Low Resistance (Peak and Hold): These injectors utilize a pulsed current to precisely control fuel delivery. They often require a resistor box to function correctly in a system designed for high-resistance injectors.
Confusing OBD connector type with injector resistance is a common mistake. While some OBD1 injectors might be low resistance, and some OBD2 injectors might be high resistance, there’s no direct correlation. For instance, OBD1 Honda Prelude injectors (345 cc/min) are low resistance, while OBD2 Prelude injectors (290 cc/min) are high resistance, even though they have different connectors.
Why Resistance Matters: Preventing Damage
Using a low-resistance injector in a system designed for high resistance can lead to burned injectors or a damaged ECU. This is because the lower resistance allows a much higher current to flow, exceeding the system’s capacity.
Imagine trying to run a high-powered appliance on a circuit designed for low-wattage devices; the circuit breaker would trip, or worse, a fire could start. Similarly, using the wrong type of injector can overload your car’s electrical system.
Resistor Box: A Necessary Component for Low-Resistance Injectors
A resistor box is used to increase the resistance in the circuit when using low-resistance injectors in a high-resistance system. It limits the current flow, protecting the injectors and the ECU from damage. If you’re upgrading your Integra GSR with low-resistance injectors, installing a resistor box is crucial. For example, using low-resistance 450 cc/min Mitsubishi injectors in a GSR necessitates a resistor box.
Choosing the Right Injectors for your GSR
The safest approach when upgrading your GSR’s injectors is to stick with high-resistance (saturated) types. This eliminates the need for a resistor box and minimizes the risk of compatibility issues. However, if you require larger injectors for performance modifications, you might have to use low-resistance options. In this case, remember to install a resistor box to protect your car’s electrical system.
Conclusion
The Difference Between Obd1 And Obd2 Gsr injectors lies primarily in their resistance, not the connector type. Using the wrong type of injector can lead to serious damage. Always verify the injector’s resistance before installing it in your GSR. If you’re unsure, consult with a qualified mechanic or automotive specialist. Prioritizing injector resistance over connector type will ensure a safe and successful upgrade for your Integra GSR.
