Porsche 924S Performance Upgrade Roadmap For Fuel-Injected Engine

The Porsche 924S is a very special car because it is combined with a lighter 924 chassis with a more powerful and reliable 944 engine. When manufactured, the 944-engine produced 150 -160 horsepower in its 2.5 L inline-4 depending on the year for which it was produced. Without forced induction, the Non-Turbo-Options horse power was increased with the following enhancements.

Stage 1 – Basic Breathing Improvements (Easy bolt-ons)

Goal: free up airflow while keeping stock reliability

• High-flow panel air filter (K&N, ITG, or similar) in stock airbox.

• Exhaust upgrade: stainless cat-back system + performance muffler.

• Headers (replace stock cast manifold).

Gains: ~5–10 hp, crisper throttle, better sound.

Stage 2 – ECU & Fuel Management Tweaks

Goal: optimize fueling/ignition for modern fuel

• Performance chip/ECU upgrade (FR Wilk, Rogue Tuning, or custom chip).

  -Adjusts fuel maps & ignition timing.

  -Raises rev limit slightly.

  -Works with L-Jetronic system.

Gains: ~8–12 hp, stronger mid-range pull.

Stage 3 – Top End Flow Improvements

Goal: let the head breathe better without turbocharging

• Port & polish cylinder head.

• Mild performance camshaft (bolt-in profiles available).

• Larger 944-spec valves for rebuilding the head.

Gains: ~10–15 hp, better top-end power.

Stage 4 – Engine Build Options (For Rebuilds)

Goal: raise compression & efficiency

• High-compression forged pistons (10.5:1+ range, works with premium fuel).

• Lightweight flywheel → better throttle response, not hp but “feels faster.”

• Balance shaft delete kit for weight savings + less drag).

Gains: ~15–20 hp from compression increase, better rev response.