Here's a breakdown of the challenges and necessary components:
Challenges:
* Engine Bay Clearance: The 3800 Series II is considerably larger and heavier than the Fiero's stock engine. Significant modifications to the firewall, inner fenders, and possibly even the chassis will be necessary to fit it.
* Transmission: The 3800 likely uses a different transmission than the Fiero (likely a 4T65-E-HD automatic or a manual). Adapting the transmission to the Fiero's rear-wheel drive (RWD) setup is a major challenge, requiring a custom driveshaft, possibly a custom rear end, and significant modifications to the transmission tunnel. Fiero's are front-wheel drive. So, you'll need to engineer a complete rear-drive setup.
* Mounting: Custom engine mounts will be required.
* Wiring Harness: The 3800's wiring harness is incompatible with the Fiero's. You'll need to either modify the 3800 harness extensively or build a custom harness.
* Cooling System: The supercharged 3800 generates significant heat. You'll likely need a larger radiator and possibly an upgraded cooling system to prevent overheating.
* Exhaust System: A custom exhaust system will be needed.
* Computer Control: The 3800's computer needs to be integrated into the system; this can be tricky, and may require a standalone engine management system.
* Brakes/Suspension: The added weight of the engine will require upgrading the brakes and potentially the suspension to handle the increased performance and weight.
Parts Needed (Partial List):
* Pontiac 3800 Series II Supercharged Engine: Aim for a low-mileage unit in good condition.
* Transmission (and associated components): This will heavily depend on your choice (automatic or manual). You will likely need a custom adapter plate.
* Custom Engine Mounts: These will need to be fabricated.
* Custom Driveshaft: Absolutely necessary to connect the transmission to the rear axle. Professional fabrication will likely be needed.
* Custom Exhaust System: Including headers, piping, and muffler.
* Modified or Custom Wiring Harness: Consider professional assistance.
* Upgraded Radiator and Cooling System: Essential for reliable operation.
* Rear-Wheel-Drive Conversion Kit (or components): This might not be commercially available and you'll need to source parts and fabricate components.
Where to Find Info:
Unfortunately, there isn't a single, definitive guide for this swap. The information is scattered across various forums and online communities. Your best bet is to search for information on:
* Fiero Forums: Search specifically for "3800 supercharged swap Fiero". Members there have likely attempted or completed similar swaps and can offer advice and tips.
* General Automotive Forums: Sites like "Yellow Bullet" or other performance-oriented forums may have discussions about similar engine swaps.
Recommendation:
This is a very advanced project. Unless you have significant mechanical experience, fabrication skills, and access to specialized tools and equipment, this is not a project for beginners. You'll be better served by starting with a simpler engine swap or finding a professional who specializes in this type of work. The cost and time investment can easily exceed the value of the finished car if not done carefully.
