* Starting point: Are you starting with a well-maintained, stock Fiero GT, or a neglected, rusty shell? A solid foundation will save you significant time and money. Repairing rust or replacing worn components will add substantially to the overall cost.
* Engine choice: The most significant factor is the engine. You could try to heavily modify the stock Iron Duke (highly unlikely to reach 300 hp reliably and cost-effectively), rebuild a larger displacement GM engine (like a small-block Chevy), or use a completely different engine altogether (like a V6 or even a 4-cylinder turbo). Each has drastically different costs associated with sourcing, building, and installing. A crate engine is far easier but more expensive than a rebuild.
* Modifications: Achieving 300 hp requires more than just the engine. You'll need upgraded supporting components, including:
* Transmission: The stock transmission likely won't handle 300 hp reliably. A stronger transmission (potentially a replacement unit, or substantial rebuild of the existing one) is essential.
* Driveshaft: Increased power means a stronger driveshaft.
* Differential: The rear differential will need upgrading to handle the increased torque.
* Cooling system: A more powerful engine needs better cooling. This could mean a larger radiator, upgraded fans, or even an aftermarket cooling system.
* Fuel system: You'll need a higher-flow fuel pump and injectors.
* Exhaust system: A free-flowing exhaust is crucial for power.
* Computer/ECU: The stock computer likely won't be able to handle the modifications. You might need a standalone engine management system, which adds complexity and cost.
* Suspension and brakes: With increased power, you'll need upgraded suspension and brakes to handle the added performance.
* Labor: Are you doing the work yourself, or are you paying a mechanic? Professional labor will dramatically increase the overall cost. Even if you're doing some of the work, you might still need a professional for certain tasks (like tuning).
Rough Estimate:
A *conservative* estimate, assuming you're starting with a reasonably good condition Fiero GT and doing a significant amount of the work yourself, could be anywhere from $5,000 to $15,000. However, it's entirely possible to spend significantly more, particularly if you opt for higher-end components, professional labor, or encounter unforeseen mechanical issues. A more realistic high-end estimate, including professional installation, could easily reach $20,000 or more.
The most cost-effective approach is likely to be using a relatively common and readily available used engine and upgrading components progressively. However, remember that this project involves significant mechanical knowledge and skill. If you lack experience, the cost will increase due to potential mistakes and necessary repairs.
