Background:
Previously I conducted a series of experiments with different configurations of the stock GTI air duct and some modifications around a CTS Turbo intake.
The objective of those tests was to evaluate the effect that different intake configurations have on the pre-turbocharger air temperature.
In this post, I discuss replacing the CTS intake with an Integrated Engineering V2 intake (IE V2) and recording pre-turbocharger air temperature during full-throttle acceleration.
Test Procedure:
The IE V2 intake is installed in my GTI without the optional carbon fiber cover. The car is driven for several minutes to bring the engine oil up to normal operating temperature and then a series of third gear full throttle pulls are made to record the pre-turbo air temperature at an increased airflow rate.
During this session, a total of six (6) full-throttle pulls are made to support averaging the air temperature data.
Test Results:
An overview of the data collection session that includes the turbocharger inlet air temperature (TIT) is shown below.
Configurations that are being compared in the remaining charts are:
| Duct Configuration Label | Duct Configuration |
|---|---|
| D1 | CTS Intake / Stock Air Duct |
| D2 | CTS Intake / Stock Duct w/ Open Driver’s Side |
| D3 | CTS Intake / Stock Duct w/ Open Drv. Side and Covered Rear Pax Side |
| D4 | CTS Intake w/ Foam Around Heat Shield / D3 Configured Air Duct |
| D5 | CTS Intake Without Heat Shield / D3 Configured Air Duct |
| IE V2 (D6) | IE v2 Intake / IE v2 Air Duct |
The first chart shows the Turbo inlet air temperature versus the outside air temperature at the start of the pull.
The square symbol is the mean temperature difference value. All temperature measurements are in degrees Fahrenheit.
The next chart shows the pre-turbo air temperature rise, or fall, during the pulls:
The last chart shows the pre-turbo air temperature above the outside air temperature at the end of the pull. The end of the pull occurs when the accelerator pedal position goes to 0% and boost pressure quickly begins to decrease:
Conclusions:
Pre-turbocharger intake air temperatures were recorded using a Mk7 GTI equipped with the IE V2 intake. Data was collected during full-throttle pulls and compared with previous measurements from other intake configurations.
Lower air temperature differences and rise are preferred. The IE V2 intake mean air temperature readings are equivalent to or lower than measures obtained using the alternative configurations.
This is great info! Surprising results. Do you have a comparison with the stock intake?
I don’t. I plan to log this data using the Eventuri intake that I normally use. I think it should give similar results as the stock airbox would.