Previously a flow test was conducted with the Wagner intercooler and the flow results ranked the product second of all the stock location intercoolers that have been tested.
This post addresses cooling performance when installed on the GTI.
This test involves a wide open throttle third gear pull that starts at approximately 2,000 rpm and continues past 6,000 rpm. The Intake Air Temperature (IAT) above ambient temperature (OAT) at 6,000 rpm is used for comparison with other intercooler products. A minimum of four data points are recorded to calculate an average temperature value.
New to this comparison is an evaluation of the intercooler outlet temperature (IC_Out) ten seconds after letting off the throttle. The IC_Out is recorded with an RTD sensor that is placed in the cold side charge pipe between the intercooler discharge and intake manifold throttle body.
The typical IAT profile during this test is shown on the chart:
A total of twelve (12) pulls were made over a period of multiple days which produced an average temperature delta of fourteen (14) degF above ambient at 6,000 rpm. This result is compared with the APR intercooler in the following chart:
Two of the Wagner pull series are shown on the next two charts:
The 10 second recovery data for the Wagner and APR intercoolers is shown on the next chart:
On average the Wager temperature is ~4 degF warmer than the APR temperature.
Combining the Wagner street data and flow bench airflow puts the Wagner versus other intercoolers as shown on the summary chart:
The Wagner Tuning intercooler produced a 14 degF intake air temperature above ambient on the third gear pull test. This is near the upper end of stock location aftermarket intercoolers that have been tested.
The 10 second recovery temperature was 11.4 degF compared to 7.1 degF for the APR intercooler.
Overall the Wagner intercooler performed similar to other stock location intercoolers and is a significant improvement over the stock GTI IC in the measures evaluated.