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The Mazda RX-7 FD, known for its lightweight design and rotary engine, has captivated car enthusiasts for decades. However, achieving a reliable 450 horsepower from this iconic vehicle requires careful planning and investment. This article delves into the true cost of building a reliable FD RX-7 with ARP head studs and an upgraded fuel system.
Understanding the Rotary Engine
The rotary engine in the FD RX-7 is unique and requires specific considerations when modifying for higher power outputs. Unlike traditional piston engines, rotary engines have fewer moving parts, which can lead to increased reliability when built correctly. However, they also have their own set of challenges.
- Lightweight design
- High-revving capability
- Unique tuning requirements
Key Components for 450 HP
To achieve 450 horsepower, several key components must be upgraded or replaced. Each component contributes to the overall performance and reliability of the engine.
- ARP Head Studs: Essential for maintaining cylinder head integrity under high boost.
- Upgraded Fuel System: Necessary to supply the increased fuel demand.
- Aftermarket Turbocharger: Required to achieve the desired horsepower levels.
- ECU Tuning: Critical for optimizing performance and ensuring reliability.
ARP Head Studs: The Backbone of Reliability
ARP (Automotive Racing Products) head studs are renowned for their strength and reliability. When building an FD RX-7 for higher horsepower, using ARP head studs is a must to prevent head gasket failure.
- Cost: Approximately $200 – $300 for a set.
- Benefits: Higher clamping force, better durability, and resistance to stretching under high boost.
Upgraded Fuel System: Meeting Demand
As power levels increase, so does the demand for fuel. An upgraded fuel system is crucial for supporting 450 horsepower in an FD RX-7.
- Fuel Pump: An aftermarket high-flow fuel pump is necessary, costing around $150 – $300.
- Injectors: Larger fuel injectors (around 800cc) are needed, priced at approximately $500.
- Fuel Pressure Regulator: A quality regulator can range from $100 – $200.
Additional Modifications for Performance
In addition to ARP head studs and an upgraded fuel system, several other modifications are essential for achieving and maintaining 450 horsepower.
- Aftermarket Turbocharger: A larger turbo can cost between $1,000 – $2,500 depending on brand and specifications.
- Intercooler: An efficient intercooler is vital for reducing intake temperatures, costing around $300 – $800.
- Exhaust System: A performance exhaust system can range from $500 – $1,500.
- ECU Tuning: Professional tuning services may cost between $500 – $1,000.
Labor Costs and Installation
When building a reliable FD RX-7, labor costs can add significantly to the overall price. Depending on the complexity of the installation, labor can vary widely.
- Engine Build Labor: Expect to pay $1,000 – $3,000 for a professional engine build.
- Tuning Labor: Professional tuning sessions can cost $300 – $500.
Total Estimated Costs
Summarizing the costs involved in building a reliable 450 HP FD RX-7 gives a clearer picture of the financial commitment required.
- ARP Head Studs: $200 – $300
- Upgraded Fuel System: $750 – $1,000
- Aftermarket Turbocharger: $1,000 – $2,500
- Intercooler: $300 – $800
- Exhaust System: $500 – $1,500
- ECU Tuning: $500 – $1,000
- Labor Costs: $1,300 – $3,500
This brings the total estimated cost to approximately $5,800 – $10,600, depending on the choices made throughout the build process.
Conclusion
Building a reliable 450 HP FD RX-7 is a significant investment, but for many enthusiasts, the rewards of performance and driving experience are well worth the cost. By carefully selecting components like ARP head studs and an upgraded fuel system, and considering the total costs, builders can create a powerful and reliable vehicle that stands the test of time.