While Garrett turbos are a popular choice for many projects, you'll need to consider several factors before selecting specific models:
* Engine Modifications: The Fiero's 2.5L Iron Duke or 2.8L V6 (the GT has the 2.8L) will require significant internal upgrades to handle the increased boost pressure from twin turbos. This includes stronger connecting rods, pistons, head studs, and potentially a forged crankshaft. The stock internals are *not* sufficient. You'll likely need custom pistons and rods designed for forced induction.
* Manifold Design: You'll need custom-fabricated turbo manifolds. This is a challenging aspect of the project. The design will influence the turbocharger selection as it affects the turbine housing A/R ratio.
* Intercooling: Efficient intercooling is crucial to prevent detonation and maximize performance and reliability. A large, efficient intercooler system is mandatory.
* Fuel System: The stock fuel system will be inadequate. You'll need a high-flow fuel pump, larger fuel injectors, and potentially a fuel pressure regulator. A programmable fuel management system (like Megasquirt) is almost essential for tuning and safe operation.
* Exhaust System: A free-flowing exhaust system is necessary to evacuate exhaust gases efficiently. This often involves custom fabrication.
* Garrett Turbo Models: For a 2.8L V6, you might consider Garrett GT28RS or similar-sized turbos. However, *this is just a starting point.* Choosing the correct A/R ratio for the turbine housing is critical and depends on your engine build and desired power band. Too small, and it spools up quickly but lacks top-end power. Too large, and it will be laggy.
Instead of directly recommending specific Garrett models, I strongly urge you to consult with experienced turbocharger specialists and Fiero enthusiasts. Forums dedicated to Fiero modifications (like fieroforum.com) are invaluable resources. They can provide insight into successful builds, common pitfalls, and suitable turbocharger choices based on your specific goals.
In short: This isn't a simple bolt-on project. It's a complex undertaking that requires careful planning, significant mechanical expertise, and a substantial budget. Start by thoroughly researching the necessary modifications and seeking advice from experienced individuals before selecting turbochargers. Jumping into this without the proper knowledge and resources could lead to engine damage or failure.
