Radiator Intercooler. Porsche 991 Turbo / 991 Turbo S  ❭  9911106

Radiator Intercooler.

Maintain efficient charge-air cooling, consistent boost performance and dependable turbocharged engine operation with these Porsche Radiator Intercoolers, part numbers 99111063973 and 99111064073. Designed for compatible Porsche applications, the intercoolers form a critical part of the engine's forced-induction and charge-air system.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16

Diagram Ref No 1 And 2

When a turbocharger compresses intake air, the air temperature rises significantly. Hotter air is less dense and can reduce the amount of oxygen available for combustion. The intercooler acts as a heat exchanger, removing excess heat from the compressed charge air before it reaches the engine.

By reducing charge-air temperature, the intercooler helps provide a denser intake charge and supports consistent engine performance, particularly during acceleration and sustained high-load operation.

The intercooler must also maintain a sealed path for pressurised intake air. Cracks, damaged connections, deteriorated seals or physical damage can allow boost pressure to escape, resulting in reduced power and potentially triggering engine-management faults.

Replacing a damaged or inefficient component with the correct Porsche Radiator Intercooler 99111063973 / 99111064073 helps restore effective charge-air cooling and boost-system integrity.

What This Product Does:

• Cools compressed air produced by the turbocharging system.
• Reduces charge-air temperature before air enters the engine.
• Helps increase the density of the intake charge.
• Supports consistent turbocharged engine performance.
• Forms part of the pressurised charge-air system.
• Helps maintain correct boost pressure when properly sealed.
• Supports responsive acceleration and power delivery.
• Helps maintain efficient combustion.
• Reduces thermal load within the intake system.
• Supports performance during sustained high-load driving.
• Works with the turbochargers, charge-air pipework and engine intake.
• Helps the engine-management system achieve expected boost performance.
• Replaces a leaking, damaged or inefficient intercooler.  

Symptoms Of Wear Or Failure:

• Noticeable loss of engine power.
• Poor or sluggish acceleration.
• Reduced turbocharger boost.
• Inconsistent power delivery.
• Check engine or engine-management warning light.
• Underboost-related diagnostic fault codes.
• Hissing or rushing-air noises under acceleration.
• Actual boost pressure failing to reach the requested value.
• Intermittent power loss under heavy acceleration.
• Increased charge-air temperatures.
• Engine entering a reduced-power or protective mode.
• Increased fuel consumption.
• Oil residue around intercooler connections or leaking areas.
• Cracks or physical damage to the intercooler.
• Damaged inlet or outlet connections.
• Impact damage. Loose or leaking charge-air connections.
• Pressure loss detected during boost-system testing.  

Why Replacement Matters:

• An intercooler performs two particularly important functions: cooling compressed intake air and containing boost pressure.
• If the intercooler develops a crack or leak, some of the pressurised air produced by the turbocharger can escape before reaching the engine. The result can be reduced boost, slower acceleration and a noticeable loss of performance.
• The engine control unit monitors boost-system operation and may detect a difference between requested and actual pressure. A sufficiently large leak can trigger underboost fault codes and may cause the engine to enter a reduced-performance strategy.
• Cooling efficiency is equally important. Turbocharging naturally increases intake air temperature, and the intercooler is responsible for removing much of this additional heat. If cooling performance deteriorates, intake temperatures can rise and the density of the incoming air can decrease.
• During demanding driving, excessive charge temperatures may cause the engine-management system to modify operating parameters to control thermal loads, potentially reducing available performance.
• A leaking or damaged intercooler can therefore affect both power delivery and thermal management.
• Replacing a defective component with the correct Porsche Radiator Intercooler 99111063973 / 99111064073 helps restore charge-air cooling efficiency, maintain boost pressure and support consistent turbocharged engine performance.

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9911106

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