A report is part of the history
A previous dyno sheet is useful even when it came from another tuner. Send the whole report, date, fuel and hardware notes. A peak number by itself cannot identify the current calibration or explain how the vehicle behaves.
Measurement or investigation?
If the aim is to establish current output, ask about a suitable power measurement. If the concern is hesitation or inconsistent delivery, explain the symptom and the earlier work. The diagnostic plan can require different checks from a normal power run.
Match testing to the vehicle
The available equipment at Llandow includes a Dyno Developments 2WD rolling road and MAHA LPS 2000 4WD facilities. Give us the drivetrain and modifications so the individual setup can be confirmed. An equipment name is not automatic approval for every car.
Agree the comparison
Explain what has changed since the earlier report. Hardware, software and test context can differ between sessions, so ask what the proposed measurement can usefully establish.
Read the remap-history guide and current dyno session information. Discuss the testing question before travelling from Caerphilly or the valleys.
Mobile Stage 1 and ECU solutions, or workshop chassis dyno tuning