Check your car for diagnostics codes, either by using a diagnostics reader or visiting a workshop and asking them to check for diagnostic codes.
Check your PPC page for common faults in your car: https://en.bsr.se/ppc/login
If you have a PPC for your car, follow the instructions below:
Measure the acceleration time as per the following instructions:
Every measurement needs to be taken under the same conditions on the same day.
The measurement needs to be taken on a flat road always in the same direction.
Do not shift gears during the measurement.
Begin the acceleration 10km/h before the starting speed of the measurement.
Measure at least three times for each interval.
The distribution of the measured times shall not be more than three tenths.
Compare the percentual difference between original and tuned with what we state on our website for your tune. You can only compare the measured time with the same car. Write down every measurement taken and include them in your support-thread.