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GT500 Aero and Cooling Deep Dive

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They really need to paint that bumper bar to match the rest of the car


If you didn't know better you would think it was a Focus RS. haha.

Can't wait to see what this car will do at the track. Still don't like it as much looks wise as a Mustang GT or 350.

I'm interested in that rear wing and how it will work on other Mustangs.

I wonder how long before we see eight different companies making reps of that wheel?
 
So here s my doubts
1. REAR WING. Yes same shape but gt4 is much higher. I was taught that a wing too close to the chassis will vain the downforce. (Under the wing u will have low pressure that will "pull up the chassis)
2. 500lbs seems a lot. So assuming a lot come from the rear wing I guess another good amount is front SPLITTER AND VENT. But...how much and at what speed?

It will be nice to understand how we can use this know how to impriblve our "normal stangs ..d5dcc37df249df1f9493cc832e530ef2.jpg1fbdc38e08bed5f8c92e617e9d2dd3f2.jpg

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ArizonaBOSS

Because racecar.
Moderator
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Arizona, USA
There is also a need for aero balance.
If having the wing closer to the body takes away, some of the aerodynamic effect, it may be because Ford can only come up with so much front downforce with the production car front body/aero configuration.

By comparison, while the GT500 has some very neat aero for a road-going car, the GT4 has signifncantly more hood venting, and more aggressive canards and splitter to offset a possibly higher-downforce configuration in the rear.

The automotive rear wing is the inverse of an aircraft wing in a general sense.
Air will move faster under the automotive wing creating a low-pressure zone between the trunk surface and lower wing surface.
This effectively creates a HIGH pressure zone on the topside of the wing, applied to the span and chord length of the airfoil, which is the downforce we get as a result.

Take the frontal CFD image as an example. The highest velocity fluid (air) is shown in red (judging by air that has not yet reached the vehicle), and the lowest velocity air is blue (stagnant/minimal velocity), with yellow being high speed transitional and green being low speed transition.
upload_2019-3-13_15-25-38.png

Now apply that color "legend" to the rear CFD image. Note that the air coming off of the roof moves pretty quickly, and slows down significantly as it approaches the wing, but speeds up significantly on the underside of the wing. That "backwards" airflow velocity (and corresponding pressure increase on top, decrease on bottom) created by the wing is what generates the downforce.
upload_2019-3-13_15-27-39.png

Also the wing might need to be as low as it is on the street car so that drivers can see out of the rear glass :)
 
Last edited:
So here s my doubts
1. REAR WING. Yes same shape but gt4 is much higher. I was taught that a wing too close to the chassis will vain the downforce. (Under the wing u will have low pressure that will "pull up the chassis)
2. 500lbs seems a lot. So assuming a lot come from the rear wing I guess another good amount is front SPLITTER AND VENT. But...how much and at what speed?

It will be nice to understand how we can use this know how to impriblve our "normal stangs ..d5dcc37df249df1f9493cc832e530ef2.jpg1fbdc38e08bed5f8c92e617e9d2dd3f2.jpg

Sent from my LG-H932 using Tapatalk


Funny, this photo makes it look so much taller. This would probably be plenty for me for the small amount of open track days I will do. Plus for the times I take a weekend spin in the car on the street I wont feel obligated to change out the deck lid to my factory one.

https://www.autoblog.com/2019/03/13/2020-ford-mustang-shelby-gt500-aero-cooling/#slide-7540505
 
There is also a need for aero balance.
If having the wing closer to the body takes away, some of the aerodynamic effect, it may be because Ford can only come up with so much front downforce with the production car front body/aero configuration.

By comparison, while the GT500 has some very neat aero for a road-going car, the GT4 has signifncantly more hood venting, and more aggressive canards and splitter to offset a possibly higher-downforce configuration in the rear.

The automotive rear wing is the inverse of an aircraft wing in a general sense.
Air will move faster under the automotive wing creating a low-pressure zone between the trunk surface and lower wing surface.
This effectively creates a HIGH pressure zone on the topside of the wing, applied to the span and chord length of the airfoil, which is the downforce we get as a result.

Take the frontal CFD image as an example. The highest velocity fluid (air) is shown in red (judging by air that has not yet reached the vehicle), and the lowest velocity air is either green or blue.
View attachment 7256

Now apply that color "legend" to the rear CFD image. Note that the air coming off of the roof moves pretty quickly, and slows down significantly as it approaches the wing, but speeds up significantly on the underside of the wing. That "backwards" airflow velocity (and corresponding pressure increase on top, decrease on bottom) created by the wing is what generates the downforce.
View attachment 7257

Also the wing might need to be as low as it is on the street car so that drivers can see out of the rear glass :)
True Drew. Balance probably isnthe key here.

A wing will generate high pres on top and low under. But if too close this low pressure could suck it up the lip "lifting the rear .
So the benefit and the lift will cancel eachother (ish..)

I think you are right. Project is limited due to street regulations (i. E. Pedestrian crash)
I think what could really help the 500 will be a nice good diffuser. I saw some pics where the underbelly seems more seal than normal 350.

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ArizonaBOSS

Because racecar.
Moderator
8,730
2,734
Arizona, USA
A diffuser will have a downforce effect on the entire vehicle, but the majority will be on the rear. So again, if you don't have a way to generate more front DF to balance it out, it might not be useful for them.
 
A diffuser will have a downforce effect on the entire vehicle, but the majority will be on the rear. So again, if you don't have a way to generate more front DF to balance it out, it might not be useful for them.
True.
So right now the gt500 has a splitter with side gurney flap and a hood louver. Probably some small frontdiffuser/tunnel. What else could be done ? I think the only option is a bigger splitter?

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