Background: This post discusses the intake air temperatures recorded at the air filter and turbocharger inlet during full-throttle acceleration using a modified stock air duct. The results are being compared with a previous modification (opening the driver’s side) and the unmodified version of the air duct. The modification tested for this experiment is covering the […]

Background: In part 1 of this experiment, I measured air temperatures at the CTS intake air filter and inside the turbocharger inlet elbow using a completely stock Mk7 air duct (Duct-1) and then with a modified stock air duct (Duct-2). The modified duct had the front of the driver’s side opened. The air temperatures with

Background: What about that air duct? In a previous post, I mentioned that I had noticed some abnormally high turbocharger compressor outlet air temperatures recently. More typically the peak temperatures with my IS38 turbocharger are about 50 degrees Fahrenheit lower than what recent temperatures have been. I speculated one possibility was that I had not