Block grille BMW e36
Hello, I have a bmw e36 and wich it's the Best option for aerodynamics:
Block the upper o lower grille. https://farm2.staticflickr.com/1616/...611bfb36_z.jpg I guess it's better to cover up. But above, the most direct air reaches the radiator. But if I Block the lower grille, less air will pass under the car. Any opinion? |
Its usually better to block the upper grill.
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As I understand it, at speed (while traveling down the road) there is an air pressure build-up at the front of the car as the air is compressed.
A lot of that pressure is at the lower chin because the air at the top part of the front has an easy escape path up and over the hood, there is acceleration of the air and lowering of pressure when this happens. Meanwhile the air attempting to escape under the car is not allowed to expand or escape and remains compressed under high pressure. Look at your radiator, all those little fins. Do you think air is going to easily pass through if there is no pressure behind it to back it up? Or do you think higher pressure air has a better chance of being pressed though it? NASCAR Computational Fluid Dynamics (CFD) Surface Pressure Plot https://robrobinette.com/S2000Aerodynamics.htm https://robrobinette.com/images/S200...e_Pressure.jpg Quote:
Short answer: Upper grille block is the norm around here. |
Thanks all.
Now I blocked the upper grill and put 1" diffuser front wheels. https://farm5.staticflickr.com/4826/...1e18c0f8_z.jpg https://farm5.staticflickr.com/4828/...7cafc698_z.jpg The car has dropped about 2inch, and has m3 style front bumper. |
Any gains?
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I need tested with more km. I would like to achieve 35mpg on winter. |
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You could do it to the radiator. If your commute is diverse, or you have that one hill that has the potential to overheat.
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