Here's a breakdown of how you might boost the turbo, categorized by complexity and cost:
I. Relatively Safe & Simple Modifications (Small Boost Gains):
* Boost Controller Adjustment (If Equipped): Some '85 Daytonas might have a boost controller. Carefully adjusting this can increase boost pressure slightly, but exceeding the factory limits is risky. Consult a workshop manual for proper adjustment procedure and limits. This is NOT recommended without a full understanding of the system's limits. Improper adjustment can severely damage the engine.
* Exhaust System Upgrade: A less restrictive exhaust system (downpipe, cat-back) can improve turbocharger efficiency and slightly increase boost response. However, this won't dramatically increase boost pressure on its own.
* Air Intake Improvements: A higher-flow air filter and smoother intake piping can help the turbocharger ingest more air, leading to marginally higher boost.
II. More Involved Modifications (Significant Boost Gains – High Risk):
These modifications require mechanical knowledge and careful planning. Improper execution can lead to serious engine damage. Consider professional help for these:
* Turbocharger Upgrade: A larger turbocharger with a higher flow rate can significantly increase boost potential. However, this requires careful consideration of the engine's capacity to handle the increased airflow and pressure. You'll likely need supporting modifications (see below).
* Fuel System Upgrades: More boost means the engine needs more fuel. Upgrades might include a higher-capacity fuel pump, larger fuel injectors, and potentially a fuel pressure regulator to ensure adequate fuel delivery under increased boost.
* Ignition System Upgrades: Boosting often necessitates upgraded ignition components (e.g., higher-energy ignition coil, stronger spark plugs) for reliable combustion under higher pressures and richer fuel mixtures.
* Intercooler Upgrade: A larger and more efficient intercooler is crucial to cool the compressed air before it enters the engine. Higher boost generates more heat, and overheating can cause detonation (engine knocking) and damage.
* Engine Management System Tuning: This is arguably the most critical aspect. You'll need to adjust the engine's computer (possibly with a standalone ECU) to properly control fuel delivery and ignition timing based on the increased boost pressure. Incorrect tuning will lead to lean running (damaging the engine), excessive richness (poor performance and potential damage), or detonation. This often involves custom tuning on a dyno.
III. Important Considerations:
* Engine Strength: The stock 2.2L turbo engine in the '85 Daytona is not designed for massive boost increases. Pushing it too hard without significant reinforcements will lead to problems such as rod knock, cracked pistons, or head gasket failure.
* Transmission Strength: The automatic transmission, in particular, may not withstand significantly increased power and torque.
* Safety: Increased boost significantly increases stress on all engine components. Regular maintenance and careful monitoring of engine temperatures and pressures are essential.
In summary: While minor adjustments might yield a small boost increase, substantial gains require extensive modifications and a deep understanding of engine mechanics. Attempting significant modifications without the necessary knowledge and tools is strongly discouraged. Professional help from a reputable tuner experienced with these cars is highly recommended if you plan on anything beyond minor adjustments. Improper modifications can severely damage or destroy your engine.
