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When I supercharged my SC400, I had a massive overheating problem.
I had a Koyo Supra Radiator, Water wetter, with distilled water, Ford Taurus electric fan (man that thing was a beast), and it still overheated, especially on the highway.
It ended up being my lower splash shield/under guard thing.
Put that back on, and it was good to go.
Please tell us more about the splash shield and overheating. i have not heard that one before.
The thing that goes under the bumper. So when you don't have the under tray, what happens is that air passes through the bumper, and takes the path of least resistance. Since the intercooler is in the way it'll go above and below it. Since you don't have the under tray, air will just go under the car, and not through the intercooler, radiator, condensor.
So it might be fine when you're stock, but once you add the intercooler, and the turbos, you lose air, and gain more heat.
The thing that goes under the bumper. So when you don't have the under tray, what happens is that air passes through the bumper, and takes the path of least resistance. Since the intercooler is in the way it'll go above and below it. Since you don't have the under tray, air will just go under the car, and not through the intercooler, radiator, condensor.
So it might be fine when you're stock, but once you add the intercooler, and the turbos, you lose air, and gain more heat.
Even with that undertray there is no guarantee that all air entering the bumper goes through the intercooler and into the radiator. This is because you remove the factory duct that channels air into the radiator when you put a FMIC in. Ideally the FMIC should be ducted to the front bumper and the aircon condensor to ensure no / minimal air leakage