6. Mazda RX-7 (FD3S)
The Mazda RX-7 FD3S, produced from 1992 to 2002, featured a sequentially turbocharged 13B REW rotary engine. While this engine offered impressive performance, its reliability was often a concern for enthusiasts. To address these issues, the aftermarket industry introduced several enhancements:
Single-Turbo Conversions: Replacing the stock sequential twin-turbo setup with a single, larger turbocharger improved reliability and provided a more linear power delivery. This modification allowed for higher power outputs while reducing the complexity of the turbo system. For instance, a single A-Spec GT35/40 ball-bearing hybrid turbo was used in some builds to achieve a strong midrange powerband. (motortrend.com)
Cooling Upgrades: To manage the increased power and maintain engine health, enhanced cooling systems were implemented. Upgrades included larger radiators, oil coolers, and intercoolers, which helped in maintaining optimal operating temperatures during spirited driving. (motortrend.com)
Engine Management Systems: Advanced engine management systems, such as the A’PEXi Power FC, allowed for precise tuning of the engine, optimizing performance and ensuring reliability. These systems enabled enthusiasts to fine-tune fuel and ignition maps to suit their specific modifications. (motortrend.com)
These aftermarket modifications significantly enhanced the FD3S RX-7’s performance and reliability, solidifying its reputation as a highly respected sports car among enthusiasts. The combination of rotary engine characteristics and aftermarket support made the RX-7 a standout in the performance car community. (en.wikipedia.org)