Intercooler Hoses and Clamps

The APR Intercooler System includes the highest quality silicone inlet and outlet hoses, T-bolt clamps, and billet MAP housing. Each component is designed to protect against boost leaks at extreme pressures and stand the test of time.

Hoses: The hoses are constructed from multi-ply silicone and are wire-reinforced to prevent swelling and bursting at extreme boost pressures. Internally, the hoses are lined with fluorosilicone to protect the hoses from oil and gasoline deterioration. Finally, each hose feature’s APR’s EZ-Flow stepped design to provide a smooth airflow path at the hose transition points.

Clamps: Strong Clampco T-bolt clamps are used throughout, replacing the factory worm-gear clamps. The clamps are made from stainless steel, and are of a high-quality and high-strength design that diminishes the risk of boost leaks. Lastly, the clamp’s thick clamping style provides increased connection strength and decreased hose slippage compared to other styles of clamps.

MAP Housing: A billet MAP sensor housing provides a secure mounting point for the factory pre-throttle MAP sensor. The precision CNC-machined housing helps prevent leaks around the sensor, and the matte-black anodizing gives the housing a clean and attractive look within the engine bay.

Testing

APR’s engineers tested each intercooler in many tests to show the impact the APR intercooler has on intake air temperature. The following tests were conducted with a 2017 S4 using the stock ECU calibration on 93 octane fuel and no other modifications. During the stock intercooler tests, ambient conditions were 72.8°F and 98.4 kPa with 78.7% relative humidity. Conditions were similar later in the day during the APR Intercooler testing with 78.4°F and 98.5 KPa with 62.8% relative humidity. This gave the APR Intercooler no added advantage over the stock system during the tests. First, six back-to-back dyno pulls were conducted with each intercooler. Each run was conducted in 4th gear, from idle to redline, with a cool down between runs. The stock intercooler failed to combat rising IAT’s and quickly exhibited power-robbing heat soak. IAT’s started at 35°C and quickly rose to 60°C by the end of the first dyno pull. This trend continued with the final dyno pull reaching a staggering 67°C! In contrast, the APR Intercooler only reached 34°C by the end of the first dyno pull. It was then able to continue rejecting heat, only reaching 36°C by the end of the final dyno pull. The APR Intercooler performed better after 6 back-to-back dyno pulls than the factory intercooler did on its very first dyno pull. Next, we tested a 10-135 second sprint through the gears. With the factory intercooler, IAT quickly rose from a starting temperature of 32°C to a blistering 81°C! It was so bad; we had to abort the test as we felt it was too dangerous to continue further. However, as expected, the APR intercooler handled IAT’s extremely well. With a starting temperature of 29°C, IAT slightly climbed above the starting temperature to 42°C by the end of the sprint. A difference of 39°C was exhibited between the two units after only a single top speed. This directly translates to faster acceleration and better performance in all conditions.