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The Mazda RX-7 is a legendary sports car known for its lightweight design and rotary engine. In recent years, car enthusiasts have explored the idea of swapping the RX-7’s rotary engine for a more powerful LS engine. This article will compare the performance of a stock RX-7 against an LS-swapped RX-7, focusing on real-world 0-60 mph times and quarter-mile performance gains.
Overview of the Mazda RX-7
The RX-7 was produced in several generations, with the most notable being the FC (1986-1992) and FD (1992-2002) models. Its lightweight construction and balanced chassis make it a favorite among driving purists. The stock RX-7 is equipped with a rotary engine, which provides a unique driving experience.
Understanding the LS Engine Swap
The LS engine, a V8 powerplant from General Motors, has become a popular choice for engine swaps due to its reliability and performance potential. Swapping an LS engine into an RX-7 significantly increases horsepower and torque, leading to improved acceleration and quarter-mile times.
Benefits of an LS Swap
- Increased horsepower and torque
- Better reliability compared to rotary engines
- Wider availability of aftermarket parts
- More tuning options for performance enhancements
Stock RX-7 Performance Metrics
The stock RX-7, depending on the model year, typically produces around 150-280 horsepower and 130-225 lb-ft of torque. This performance allows the RX-7 to achieve impressive acceleration and handling characteristics.
0-60 Performance
The stock RX-7 can achieve 0-60 mph times in approximately 5.5 to 6.5 seconds, depending on the specific model and condition. This performance is commendable for a sports car from its era.
Quarter Mile Performance
In the quarter mile, a stock RX-7 typically runs between 14.0 to 15.0 seconds, again varying by model and conditions. This performance is competitive for many vehicles in its class.
LS Swapped RX-7 Performance Metrics
When equipped with an LS engine, the RX-7 can see a significant boost in performance. Depending on the LS variant, horsepower can range from 300 to over 600, with torque figures often exceeding 400 lb-ft.
0-60 Performance
An LS-swapped RX-7 can achieve 0-60 mph in as little as 3.5 to 4.5 seconds, depending on the specific engine and modifications made. This dramatic improvement showcases the potential of the LS engine.
Quarter Mile Performance
In the quarter mile, LS-swapped RX-7s can achieve times as low as 10.0 to 12.0 seconds. This performance places them in a different league compared to their stock counterparts.
Comparative Analysis
When comparing the stock RX-7 to an LS-swapped RX-7, the differences in performance are stark. The LS swap not only enhances speed but also provides a more robust driving experience.
Performance Gains Summary
- Stock RX-7 0-60 mph: 5.5 to 6.5 seconds
- LS Swapped RX-7 0-60 mph: 3.5 to 4.5 seconds
- Stock RX-7 Quarter Mile: 14.0 to 15.0 seconds
- LS Swapped RX-7 Quarter Mile: 10.0 to 12.0 seconds
Conclusion
The comparison between a stock RX-7 and an LS-swapped RX-7 clearly illustrates the performance benefits of the LS engine. While the stock RX-7 is a remarkable vehicle in its own right, the LS swap transforms it into a high-performance machine capable of competing with modern sports cars.
Ultimately, the choice between maintaining the stock rotary engine or opting for an LS swap will depend on individual preferences, driving goals, and the desired driving experience.