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      11-28-2017, 05:44 PM   #35
dogbone
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Drives: '09 E90 M3 - IB
Join Date: Feb 2012
Location: 93 million miles from the Sun

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2009 BMW E92 M3  [0.00]
2009 BMW E90 M3  [0.00]
Quote:
Originally Posted by Richbot View Post
iirc these cars only lift about a dozen lb at the front and have a little bit of rear downforce stock, so you might actually be into negative lift with the hood vented
The topic of air pressure in engine bays and wheel wells, and hoods generating lift is a new area of curiosity for me.

You have a solid technical grasp of these cars, so I'll ask you:

If you were to make a general guess-----how much change in lift/downforce do you think you might see from a vented hood? I saw in that linked article that the M3 is making 22lbs of front-end lift at 124mph. If you say that a "negative lift" situation might be the result of hood vents, I'm assuming you're thinking the change in force is more than 22 lbs. How much change in force do you think it could be?

And do you think the effects of the vented hood are overshadowed by having a lip and 5" splitter and canards in place already? (The addition of the lip and splitter changed the car DRAMATICALLY for the better.) Or would they all work together to create even more downforce?

Anyway, I'm curious to hear your thoughts.
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