Thanks for sharing. This forum is like crack because of people like you.
Quote:
Originally Posted by ATL BRZ
The factory bumper accessory here:
Is not functional at all and is purely cosmetic. |
I just got my brz a few weeks ago and I was curious what this "diffuser" option looked like. I agree that it's silly, but I'm not sure that I agree that it's 100% cosmetic. It seems like the piece has some rake to it, which would make it more like a lower spoiler than a lift-neutral decoration.
Quote:
To get real measurable downforce you need a full diffuser that goes back almost to the differential and creates a low pressure area under the car at high speeds. It should cover up nearly everything underneath in that area to maximize the effect, and flush the air out upwards off the back of the car, like this:
The factory suitcase muffler was actually designed to have this effect at speed, but not nearly as significant as a full diffuser.
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It seems to me that the vertical slats would ideally extend all the way down from the backmost point on the diffuser to the lowermost point. This would no doubt impact speedbump and driveway clearance. On the other hand, I'm a software engineer rather than a real engineer, so WTF do I know.