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The RX-7 is a legendary sports car known for its lightweight design and rotary engine. However, many enthusiasts have turned to LS swaps to enhance performance. In this article, we will compare the power output and performance characteristics of the RX-7 when equipped with a 6.0L LQ4 engine versus a 6.2L L92 engine.
Understanding the Engines
The LS engine family has become a popular choice for engine swaps due to its power potential and aftermarket support. The 6.0L LQ4 and the 6.2L L92 are two common options for RX-7 enthusiasts.
- 6.0L LQ4: This engine is a cast-iron block V8 that produces around 360 horsepower and 380 lb-ft of torque in its stock form.
- 6.2L L92: The L92 is an aluminum block engine that offers a higher output, typically around 403 horsepower and 417 lb-ft of torque.
Power Output Comparison
When considering a power comparison, it is essential to look at various factors, including horsepower, torque, and weight distribution in the RX-7.
- Horsepower: The L92 engine provides a significant horsepower advantage over the LQ4, making it a preferred choice for those seeking maximum performance.
- Torque: The LQ4’s torque is beneficial for low-end power, which can enhance acceleration from a standstill.
- Weight: The aluminum L92 is lighter than the iron LQ4, contributing to better handling and weight distribution.
Performance Characteristics
Beyond raw power numbers, the performance characteristics of each engine can greatly influence the driving experience.
- Throttle Response: The L92 generally offers better throttle response due to its advanced design and intake manifold.
- RPM Range: The L92 can rev higher, providing a more exhilarating driving experience at higher speeds.
- Fuel Efficiency: The L92 may offer slightly better fuel efficiency, depending on tuning and driving conditions.
Cost Considerations
When considering an LS swap, cost is a critical factor. The price of the engine, installation, and necessary modifications can vary significantly.
- 6.0L LQ4: Generally, this engine is more affordable and easier to find, making it an attractive option for budget-conscious builders.
- 6.2L L92: While more expensive, the performance gains may justify the higher initial investment for serious enthusiasts.
Installation and Compatibility
Installing an LS engine in an RX-7 requires specific considerations for compatibility and fitment.
- Mounting: Both engines require custom mounts, but the LQ4 may have more readily available options.
- Transmission: The choice of transmission can influence installation complexity; both engines can be paired with popular options like the T56.
- Wiring: Wiring harnesses and ECU tuning will be critical for both swaps, with the L92 often requiring more advanced tuning solutions.
Driving Experience
The driving experience can differ significantly between the two setups, affecting how drivers perceive each engine’s performance.
- 6.0L LQ4: Offers a robust low-end torque feel, making it ideal for street driving and daily use.
- 6.2L L92: Delivers a more aggressive power band, appealing to those who prioritize track performance and spirited driving.
Conclusion
Both the 6.0L LQ4 and the 6.2L L92 engines present unique advantages for an RX-7 LS swap. The choice ultimately depends on the driver’s goals, whether it be budget, performance, or driving experience. Each engine has its merits, making the RX-7 a versatile platform for performance enthusiasts.