SL55/63/65/R230 AMG: Intake air temperature for an SL65???? What's it supposed to be?
I've heard 20F above ambient temperature.
I've heard 150F.
Does anyone know?
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My point is with good airflow and short bursts off power (under a minute), you should not be seeing high IATs.
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With the heat being rather high, I took a few readings at steady state cruising. With 102 degF ambient temps, mine runs 155 degF on IATs at a 70mph cruise. At 80 mph it dropped to about 147 degF. I had hard time maintaining slower speeds the other day due to traffic but with 100 degF ambient mine was running a hair over 170 degF at a near steady 35mph speed. If I punched it, the temps drop dramatically - which is what you'd expect (down to about 115 degF) until it heats up the water circuit but I'm doing over 100mph before I start seeing that.
Another data point is at Texas World doing a track day, the IATs were in the 190-230 degF range towards the 3-4th lap. And I was only at about 1/2-3/4 throttle on the straights.



