Quote:
Originally Posted by samwichse
After installing the Scott's solid metal undertray on my Insight (instead of the two smaller pieces that cover 1/3 of the area under the engine each), I found the car took longer to warm up and had a harder time maintaining coolant temperature under lean burn conditions on the highway.
I ended up having to partially block the lower grill area to compensate.
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If you were to go bigger with the front undertray (including filling some of the front wheel air exit openings), you'd then find that radiator cooling flow starts to decrease. That's what happened on my Insight.
So a good example of cooling airflow being controlled by altering the exit openings.