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The ECU uses this temp reading when determining how much ignition advance to give the motor.
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Yes, agreed. The improvements of cold air are well proven in both injected and carby applications. You only need to go to a drag strip and watch the cars get faster as the night air gets cooler to see this.
Thinking about this further, this was most likely done by bringing the car to operating temp and then running on the dyno with what appears to be a 3rd gear pull (i think). There would most likely be even more benifits over time with the heat soak in the engine bay (especially if on a track).
I imagine in a cobra this would not be such a problem though with the hood scoop and side vents.