Background:
This post continues a series where Stage 2 tune options for the Mk7 GTI are compared.
In this post an IS20 Stage 2 tune from Revo Technik is installed on a Mk7 GTI and engine and vehicle performance data are recorded for comparison with other stage 2 tune options.
Revo Technik is a UK-based tuner with dealers in the United States. Close to me in Orlando Florida is Noster Motorsport who are a Revo dealer so I took the GTI in to have the Revo IS20 Stage 2 tune installed.
Test procedure:
Information about the data collection procedures is found on the main test page.
Revo Test Results:
An overview of one data collection session is shown below to illustrate how the data was recorded:
The next charts show the typical changes in engine operating variables as engine RPM increases during multiple third-gear full-throttle pulls.
The air-to-fuel ratio is shown with the red lines and the intake air temperature with the pink and purple lines.
Boost (red lines) and turbocharger wastegate duty cycle (pink and purple lines):
The Ignition Timing Advance (red lines) and occurrences of ignition timing retard (yellow, green, and pink lines):
Low-pressure fuel pump duty cycle (red lines) and fuel rail pressure (pink and purple lines):
The next chart shows an overview of a series of pulls with a row assigned to each engine cylinder.
The red line is the boost pressure and the white lines are occurrences of ignition timing retard.
This data is used to calculate a Knock Retard Percentage (KR %) which is discussed in detail in the Stratified OTS IS20 Tune Datalog Refinement post in the section titled “KR Percentage”.
Over a total of 30 pulls, a portion of which is shown above, an occurrence of timing reduction during a pull was recorded during 22% of opportunities.
The next chart shows a subset of pulls that were made to calculate an estimated peak wheel horsepower.
Aftermarket Tune Comparison:
The following charts show a comparison of the Revo tune with other aftermarket tunes that I previously tested.
The number in parenthesis (x) is the number of individual samples making up the average.
The next chart shows trends between all of the tunes that have been tested.
The average boost pressure that the tunes operate at between 2900 to 5000 rpm is plotted along with the Knock Retard percentages.
Conclusions:
The Revo Stage 2 IS20 tune for the Mk7 GTI was tested to record engine and vehicle performance variables to compare with other aftermarket Stage 2 tunes.
The Revo tune produced acceleration times over the custom time interval and estimated peak wheel horsepower that are comparable with the top values recorded thus far.
Peak WHP trailed the top measurement by 8 WHP and the Dragy acceleration time trailed the top measurement by 0.1 seconds.
Confidence check:
The difference in the Dragy acceleration times and Peak WHP samples were compared using a t-test (alpha = 0.05) and Power Analysis (alpha = 0.05 and power of 0.8).
The differences were found to be statistically significant and sufficient samples were used for the comparison.
Outstanding information
Thanks