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 rear side of the air duct on the passenger side.
Duct-2 had this area uncovered. Duct-1 is the unmodified air duct.
In the second part of this series, the Duct-2 was evaluated during routine driving. In this post, the measures are being compared during full-throttle acceleration.
The process for collecting the full-throttle acceleration temperature data was described in part 1.
- Duct-1: Unmodified, Driver Side Front Closed, Passenger Side Rear Open
- Duct-2: Modified, Driver Side Front Open, Passenger Side Rear Open
- Duct-3: Modified, Driver Side Front Open, Passenger Side Rear Closed
An overview of the data collection session is shown on the chart:
A closer view of the time when the acceleration data was recorded is shown next:
Next is a comparison of the turbocharger inlet air temperature using air Duct2 (dashed lines) and Duct-3 (solid lines):
The turbocharger inlet air temperature above the ambient air temperature at the beginning of the pull for each duct is shown next:
The mean value for each data set is represented with a square box.
The temperature increase during the pull, ending temperature minus starting temperature, is shown next for each of the ducts:
The final chart compares the turbocharger wastegate duty cycle during the pulls for this session with Duct-3 and indicates the range measured using Duct-2 with an arrow:
The modification made with air duct configuration three (3) had a small effect on the starting air temperature during the pulls. Temperature rise during a pull was not noticeably changed.
The turbocharger wastegate duty cycle recorded with Duct-3 is slightly lower than Duct-2, but the ambient air temperature was also slightly lower than with Duct-2 which could be the source of this difference.
Duct-3 had the best combined measurements of the three configurations tested.