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Originally Posted by Fat Charlie
The grille? Upper and lower all face right into the radiator. Until I get more used to its temperature range I don't dare reduce it, especially going into summer.
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Most of the cooling usually comes from the lower grille.
Do you have something like a ScanGauge so you can see the actual temperature, rather than the car's own temp meter ?
My 90% upper grille block increased water temps by only 3 - 5° C - invisible on the car's thermometer.
Find out what temp your thermostat opens at, temps should not go much higher than that - and not stay well above that for long.
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With this underbody an air dam would just increase FA.
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It could still work.
Air going underneath will still cause drag. You could still benefit from a moderate air dam - even though it will increase frontal area.
Try it, and see what it gives.
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It sometimes moves with a sense of urgency.
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LOL.