Unichip Q4 and
Install and road test
Before I get into the results after installing the performance chip and exhaust, it's important to remember a few things. These results apply to my vehicle under the conditions present at the time of testing. They should only be taken as indicative for any other vehicle due to variability in vehicles, modifications, specifications, testing equipment, fuels etc.
There are a series of dyno graphs below which give the figures, but they don't describe the way the feeling of the vehicle has completely changed. There is an absolutely massive improvement in performance, particularly in the mid-range. The difference in rolling acceleration (such as for overtaking) must be experienced to be believed.
As I write this, I've had the Unichip and exhaust installed for a few months, and have settled on running the 'Max Economy' tune most of the time. I find it to be the best combination of substantially improved performance, while using less fuel than standard. Scroll down for more information on fuel economy, plus a comparison table of performance and economy in various configurations.
Standard Vs Unichip Q4 + Unichip exhaust
This graph is essentially the complete "before and after".
It shows the standard 200, and then after the installation of both the Unichip exhaust system and the Unichip Q4, set on the 'Maximum Power' setting. In combination, the chip and exhaust delivered a remarkable 53% increase in power and torque over standard.
Standard Vs Unichip exhaust
This graph shows the effect of the Unichip exhaust system in isolation. It compares the standard 200-series, and then after the installation of the Unichip exhaust. The exhaust increased power by around 5% and torque by around 20% at the peaks, and an even greater improvement at lower RPM.
Unichip Q4 Max Power Vs Unichip Q4 Max Power + Unichip exhaust
This graph shows the effect of the Unichip exhaust once the Unichip Q4 has been fitted. You can see that the exhaust itself produces greater gains with the chip fitted than on the standard engine. I suspect this is because the improved flow of the larger exhaust is more effective when dealing with the increased exhaust volume generated by the chipped engine.
Standard Vs Unichip Q4 Economy Vs Unichip Q4 Max Power
This graph shows the difference between a standard 200, a 200 with the Unichip Q4 on the Economy setting, and a 200 with the Unichip Q4 on the Max Power setting. All of these dyno runs were performed with the standard exhaust system.
This graph demonstrates one of the great advantages of the Unichip over other performance chips. These three settings (and two more) are all selectable at the flick of a switch (or via an iPhone app).
Power and Torque 'at the flywheel' Versus 'at the wheels'
The graphs above all show 'at the wheels' results from a chassis-dyno, while manufacturers quote figures 'at the flywheel', measured on an engine dyno. 'At the wheels' figures are substantially lower, as they allow for losses which occur throughout the driveline.
I've had many questions from people trying to compare these numbers, so I've produced a graph which shows approximate 'at the flywheel' figures, using data and approximate driveline losses extrapolated from the graphs above.