Background:
After recently installing the Majesty Competition intercooler on the Mk7, along with a Majesty FMIC in a bicooler configuration, I recorded some data during a pull to compare performance with the previous setup, which consisted of the AMS Performance stock-location intercooler and the Majesty FMIC.
Majesty Street Data:
Data was recorded using a Shuenk IS48 turbocharger with a Russell Road and Racing E40 ECU tune. Two full-throttle pulls in fourth gear are made.
Given the power level this setup delivers and the limited geographic areas that support data collection in fourth gear, it’s not possible to get back-to-back pulls to check the intake air temperature rise during sequential pulls.
The intake air temperature (IAT) above ambient at 6,000 RPM is shown for the two pulls using the Majesty Competition IC and the Majesty FMIC.
The next chart is the same data logged with the AMS Performance IC and Majesty FMIC.
Results are very similar.
Next, the overall IAT and ambient temperature during the sessions are shown. These are also similar.
Looking at the air temperature trends for each IC setup during the two pulls, they are similar.
Boost pressure is the same across both setups, but the lower-pressure-drop Competition IC setup has a slightly lower wastegate duty cycle (WGDC).
The next chart is a single pull comparison of the change in WGDC.
Conclusions:
The Majesty Competition tube-and-fin intercooler was installed on the GTI to record data on the street. A comparison of air temperature and wastegate duty cycle was made between a setup with the Majesty IC and one with the AMS Performance IC, each paired with an FMIC.
Air temperatures were similar between the two test cases, and the turbocharger wastegate duty cycle decreased slightly when using the Majesty Competition IC.