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Let's Talk Aero

antman450

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I have seen many discussions regarding aero, down-force, drag, etc., but they are all littered throughout other threads. I thought maybe it would be good to have a thread where we discuss these things. This, with the caveat that I don't have thousands to spend on custom carbon parts and wind tunnels.

I'll start with my current problem, push while at neutral or on throttle during high speed (100 MPH) sweepers. The car is neutral to slight over steer every where else. I like a bit of over steer. So, during a sweeper, there is no change in weight transfer (for the most part) and yet I have a mild push. I conclude that I need more front down-force for a rather simple and fundamental reason:

If I lift slightly to put a bit of weight on the front, it almost completely goes away, but it is also slower. I cannot induce on throttle over-steer at those speeds because the rear is rather planted. Actually, as I add more throttle, I lose more front grip.

Certainly, with large, low drag wings, the rear is more addressed than the front.

So, I have a 4 inch splitter and hood vents. That is the extent of what is working for me on the front. My thoughts are, fender vents, more hood venting if possible (don't want to drop the $$$ on a tiger racing hood right now), side canards, and a 1 inch damn between my splitter and lower fascia. Then some fender splats.

I would love to hear from some others on their thoughts. @AJHartman I am sure would be able to add some great info to this. @ArizonaBOSS, did you feel that the canards made a noticeable difference?

So, post on.....
 

RES_22

Rob
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Possibly a dumb question but....have you corner balanced the thing?

Is it fuel-load dependent? Worse with a heavier load?

Have you tried a bit less front rebound?

Worse in RH vs LH corners?

Just wondering...rule out the obvious first...
 

antman450

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Possibly a dumb question but....have you corner balanced the thing?

Is it fuel-load dependent? Worse with a heavier load?

Have you tried a bit less front rebound?

Worse in RH vs LH corners?

Just wondering...rule out the obvious first...
No change with fuel load, right-hand and left-hand the same, messed with dampening, camber, and ride height as well. The car just works so well everywhere else and I can induce throttle oversteer anytime, except at over 100 miles an hour.

I guess really though, so many people focus on rear downforce, I would like to hear on some more ideas about front downforce.


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ChrisM

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Does the Tiger hood actually create downforce or does it just reduce lift? I would guess that the Trackspec louvers (which I also have) reduce lift but don't create downforce.
 

Fabman

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Does the Tiger hood actually create downforce or does it just reduce lift? I would guess that the Trackspec louvers (which I also have) reduce lift but don't create downforce.
Anything that reduces lift increases downforce. Opposite side of the same coin. How much is the question. I see some seriously fast pro race cars using these Trackspec hood vents so I gotta think they know something about them.
 
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Fabman

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Fabman

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"Anything that reduces lift increases downforce"
Well maybe that isn't exactly true...there is static weight, then there is lift, then there is downforce...lift lightens the nose while down force adds weight (from a reference zero-or static weight) so my over simplification was sloppy. There is a difference, but basically you have to lessen one to get the other. That's probably a better way of saying it.
 

ChrisM

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"Anything that reduces lift increases downforce"
Well maybe that isn't exactly true...there is static weight, then there is lift, then there is downforce...lift lightens the nose while down force adds weight (from a reference zero-or static weight) so my over simplification was sloppy. There is a difference, but basically you have to lessen one to get the other. That's probably a better way of saying it.
That's more along the lines of what I was thinking.
 

antman450

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Anything that reduces lift increases downforce. Opposite side of the same coin. How much is the question. I see some seriously fast pro race cars using these Trackspec hood vents so I gotta think they know something about them.
That’s what I have. Not sure how much better a tiger racing hood actually is. Their hood has a great design and bigger vents but not sure how much more effective. I actually wish Trackspec made more vents for my 2011 mustang hood. Wish they made fender vents too. May go DIY.


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antman450

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See what you like here:
https://www.americanmuscle.com/search?keywords=vents&generation=2010-2014&vehicleType=Mustang

Several styles to choose from and they aren't expensive at all, and I know Antman isn't afraid of taking a jackhammer to his car if it means going faster. ;)
The method they use for install is ridiculous, if you decide to get some I'll share my method with you. It wasn't hard.
I certainly have not problem cutting into my car. Lol [emoji12]


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ChrisM

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That’s what I have. Not sure how much better a tiger racing hood actually is. Their hood has a great design and bigger vents but not sure how much more effective. I actually wish Trackspec made more vents for my 2011 mustang hood. Wish they made fender vents too. May go DIY.


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The lip around the vents of the Tiger hood create a pressure difference that actively draws air out (not sure if that's the correct description), whereas the Trackspec louvers lack that. I recall seeing someone do a string test on their hood not long ago where they cut the holes in the hood and then tested it with and without a lip in front of the hole and it was a noticeable difference. Without the lip, the string laid flat against the hood. With the lip the string stood up perpendicular to the hood before flattening out. The Trackspec louvers may have some of that effect, but I would guess that if they made the first louver stick out into the airstream further than the others it would make a dramatic difference.
 

dabossinnne

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Does the Tiger hood actually create downforce or does it just reduce lift? I would guess that the Trackspec louvers (which I also have) reduce lift but don't create downforce.
Check out this old Ford Racing TV vid of early B302S wind tunnel testing w/ a Tiger Racing hood. Air extraction through the Tiger hood looks to be quite substantial and I would think greatly aids in reducing front end lift.

 

ChrisM

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I found the pictures I was looking for. The Tiger Racing hood has this concept molded into the hood whereas the Trackspec louvers don't have this provision but could probably benefit from it. Can't wait to see what you come up with @Fabman .

19598446_10209144507992190_6441236625656575736_n.jpg
19511611_10209144516352399_853430997053921530_n.jpg
 
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