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Flipped airbox to reduce air intake temperature

While stationary in the pit lane on a track day, I observed the intake air (IAT) temperature exceed 70°C. It took almost a full lap at speed to cool down the intake air again.

High intake temperature sets of a series of events which reduces engine power and response

  • The ECU retards ignition timing above 30°C IAT.
  • Increased risk of detonation.
  • If the knock sensors detect detonation, the ignition timing will be further retarded by the ECU
Time to do some improvements! By inverting the airbox and cutting the radiator shroud, cold air is drawn from the outside. I also decided to add thermal insulation to the airbox and shroud.

It will be interesting to compare IAT readings in the HP Tuners log file before and after this modification.