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Flipped airbox to lower air intake air 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.

  • Increased risk of engine ignition knock / detonation
  • The engine ECU retards ignition timing above 30°C IAT
  • If the ECU detects ignition knock, the ignition timing will be further retarded by the ECU
Time to do some improvements! By cutting the radiator shroud and inverting the airbox, colder air is drawn from the outside the engine bay. The most noticeable improvement afterwards is the IAT drops quickly after leaving the pit lane on track days, which was my main goal.