This project is a continuation of the Turbocharger Inlet Pipe airflow test and evaluation and expands the range of system components under test to include the Mk7 GTI air box, air intake pipe, and turbocharger inlet elbow.
The TIP test demonstrated that there are gains in airflow measurements over the stock Mk7 GTI turbocharger inlet elbow through the use of aftermarket options. The TIP test also demonstrated that there are minor variances in measured airflow between aftermarket turbocharger inlet pipe options.
2. Purpose of Test
This project will evaluate various pre-turbocharger intake components available through the aftermarket to determine if there is a combination of intake parts that provides superior airflow and temperature performance versus the OEM parts equipped on the Mk7 GTI.
The project will seek to determine if there is an optimal combination of stock and/or aftermarket intake components for increasing system performance.
3. Description of Equipment
3.1 Test Items
The air intake components under evaluation connect the grill to the turbocharger compressor inlet. These parts are the airbox, or in the case of some aftermarket options an open filter, possibly used conjunction with a panel system to isolate the filter from the engine compartment. An intake hose or pipe, typically made of silicone, plastic, or carbon fiber, that joins the airbox to the turbo inlet elbow, and last the turbocharger inlet elbow.
3.2 Test Vehicle
The vehicle that will be used during recording of intake air temperatures will be a 2015 Mk7 GTI.
3.3 Test Instrumentation
The intake air temperature readings to be made inside the intake components will done with a pair of Auber Instruments resistance temperature detectors (RTD) relayed through Auber digital thermometers with analog output to a DATAQ data acquisition and logging system. Intake air temperature at the intake manifold along with vehicle speed will be recorded using a Ross-Tech VCDS cable that attaches to the vehicle OBD2 port and is logged via the accompanying Ross-Tech software.
Airflow measurements will be recorded using a PTS orifice style flowbench and PTS digital manometer.
4. Scope of Test
4.1 Test Envelope
Road driving to collect intake temperature data will take place during a daily commute at speeds ranging from 25 mph to 45 mph.
Airflow testing using the flow bench will be done at a test depression of 28″ of H2O.
4.2 Test Conditions
Road testing is taking place in a geographic area where morning temperatures are around 60-70F and afternoon temperatures are between 70-85F. Depending upon how long testing of the intakes continues these typical environmental conditions could change, becoming warmer as summer approaches.
Airflow testing will be performed inside a garage. The orifice style flow bench readings are unaffected by daily changes in environmental conditions.
4.3 Test Configuration
The turbocharger inlet elbow will be fitted with a RTD probe to measure air temperature at the end of the pre-turbocharger intake path.
A second RTD probe will be located at the entry to the airbox to measure the temperature of the air as it enters the intake system.
More information about the temperature reading setup can be found at this link.
For measuring airflow all intake systems will be attached to the PTS flow bench by an adapter that replicates the intake to the turbocharger compressor housing.
4.4 Test Criteria
Temperature data sets will consist of at least two morning drives and two afternoon drives.
Flow bench testing will entail a single measurement made at 28″ of H2O.
4.5 Completion Criteria
The following systems constitute the minimum set of articles to be tested:
- Stock Mk7 GTI Airbox and stock accordion hose
- APR Carbon Fiber Airbox and Carbon Fiber Intake Pipe
- Integrated Engineering Filter and Intake Pipe
- Induct Performance Filter and Intake Pipe
- S&B Airbox and Intake Pipe
4.6 Limitation to Scope
Operating envelope of the vehicle will be limited to public roadway posted speed limits and maximum drive times of approximately 30 minutes.
There are numerous product vendors selling air intake systems that claim to provide performance gains over the stock system but it is unlikely all of the available systems will be tested and evaluated.
5. Method of Test
The RTD probes will be calibrated prior to testing to an accuracy of +/- 2 degrees F of each other.
Airflow measurements using the flow bench will have a calibration plate tested before test articles.
The air intake will be configured for flow testing to replicate the configuration on the vehicle for temperature measurements.
5.2 Operational Procedure
Air temperature readings will begin being recorded when the vehicle is started and will continue until the engine is shut off. The difference between temperature probe one and two will be calculated and will be used as the basis for assessing the ability of the air intake setup to provide cool air to the turbocharger.
When testing with the flow bench, airflow through the intake will be increased until a test depression of 28″ of H2O is achieved. The airflow at 28″ of H2O will be used as the basis for the comparison of flow performance between the different intake configurations.
6. Project Management
|Test Item||Vendor||Vendor Response||Owner Donated||Test Status|
|APR||Audi Performance & Racing||n/a||Yes||Complete|
Intake systems have been found being offered by the following:
034 Motorsport, aFe, AMS, APR, Autotech, AWE, Burger, CTS, DFG, ECS, Eventuri, Forge, IE, Induct, Injen, K&N, Mishimoto, Neuspeed, Racingline, Revo, S&B, Spulen, Unitronic, USP
Links to test activities will be posted as testing progresses.
034 Cold Air Intake Airflow Test
034 “Insuction Bundle” Airflow Test
APR Carbon Fiber Intake System Tests
APR PEX Intake Tests
CTS Turbo Intake Airflow Test
do88 Intake System Airflow Test
Eventuri VW GOLF MK7 GTI Intake
Forge Motorsport Intake Airflow Test
Induct Performance Air Intake Tests
Injen Open Intake Airflow Test
Integrated Engineering v1 Cold Air Intake Tests
Mishimoto Intake Tests
Mk7 GTI Stock Air Intake Tests
Mk7 GTI Modified Stock Air Intake Tests
MST Performance Cold Air Intake System
Racingline VWR R600 Intake System Tests
S&B Filters Cold Air Intake Tests
USP Tear-Duct Intake Airflow Test
Consolidated Airflow Results
Note that the following intakes have NOT been flow tested:
- 42 Draft Designs
- aFe Power
- Agency Power
- AMS Performance
- ARMA Speed
- AWE Tuning
- Blaze Performance
- DFG Tuning
- ECS Tuning
- Injen EVO
- Integrated Engineering V2