GT350R Splitter worth it?

[TheDeadCow]

Here's a link to a splitter build

http://www.vorshlag.com/forums/showpost.php?p=57713&postcount=238

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[MrCincinnati]

More canards

http://www.ajhartmanracing.com/15-17-mustang-canards/

I believe this guy uses CAD simulation/analysis to design his aero. He's also active on TMO...

Much better price also. I was reading one of his write ups about canards, not sure why I didn’t think to see if he made any for mustangs.

 

[BmacIL]

Okay dudes, got some info from APR.

NONE of their current offerings are suitable for the S550 chassis except for the GT-250 or the GTC Drag Wing which is discontinued. The GT-250 is the exact same wing that is used on the 350S race car.

http://aprperformance.com/racing-product/gt-250-adjustable-wing/

The GT-250 is extremely adjustable and flexible for the intended use from becoming almost a gurney flap on pedestals to a low drag race wing.

APR gives aero data in the CDF Data section:

I kinda sorta know what's going on here but on this visual above, we basically get the general answers we want. The wing is also around $1,700 so take that as you will and what it's worth for you.

The efficiency is the downforce/drag (also known as Lift/Drag or L/D). That wing is really efficient actually.

 

[nastang87xx]

More canards

http://www.ajhartmanracing.com/15-17-mustang-canards/

I believe this guy uses CAD simulation/analysis to design his aero. He's also active on TMO...

I don't believe those will work on our cars because they're using a base Mustang front fascia. After talking to APR they said that their canards offering won't work on GT350's because the fascia is actually that different.

 

[nastang87xx]

The efficiency is the downforce/drag (also known as Lift/Drag or L/D). That wing is really efficient actually.

That was my impression. 120lbs drag or whatever at 160MPH with 600+lbs of downforce actually seems really good.

 

[Muligan]

I installed an APR wing on my former track car and found it to be extremely well balanced and stable at Road America through the faster turns, such as 1, 7, 9, 11, 12, and 13.... especially 11 (The Kink).

 

[nastang87xx]

I installed an APR wing on my former track car and found it to be extremely well balanced and stable at Road America through the faster turns, such as 1, 7, 9, 11, 12, and 13.... especially 11 (The Kink).
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That's my "home" track. The kink scares the living shit out of me. I want to hit 90 MPH IN the Carousel. Not coming out of it...IN it. Not sure that's going to happen without aero assistance. Kettle Bottoms can be a little nerve wrecking too.

 

[nastang87xx]

Okay so my physics is SUPER rusty... at 126 lb force drag, how much horsepower would be required to overcome the additional drag? Anyone have any formulas?

 

[l'Ingegnere]

P = 0.5 * rho * Cd * A * V^3

or..

Power = Drag Force * Velocity

 

[nastang87xx]

Okay I hope I'm interpreting this like a smart person...

126.43lb force x 160 MPH = 20,229 watts.

20,229 watts / 746 watts (1 HP) = 27.12 horsepower


Correct?

 

[l'Ingegnere]

Okay I hope I'm interpreting this like a smart person...

126.43lb force x 160 MPH = 20,229 watts.

20,229 watts / 746 watts (1 HP) = 27.12 horsepower


Correct?

Not quite, trying to do it in my head with my iPhone calculator I think it’s about ~54 hp.

160mph * (88 ft/s) / 60mph * 126 lbf / (550 ft-lbf/s) = ~54

 

[Hack]

Huh, I get 11 hp!

http://www.dummies.com/education/science/physics/how-to-calculate-power-based-on-force-and-speed/

115 N (126 lbf) X 71.5 M/S (160 mph) = 8,222 watts

8,222 watts/745 w/hp = 11 hp

 

[nastang87xx]

Ugh...I gotz to no! Because if this wing only needs another few horsepower, that's an intake and a tune away which is no sweat. And I'd be VERY okay with having a few hundred lbs of downforce in the butt.

 

[S550GTCS]

Okay dudes, got some info from APR.

NONE of their current offerings are suitable for the S550 chassis except for the GT-250 or the GTC Drag Wing which is discontinued. The GT-250 is the exact same wing that is used on the 350S race car.

http://aprperformance.com/racing-product/gt-250-adjustable-wing/

The GT-250 is extremely adjustable and flexible for the intended use from becoming almost a gurney flap on pedestals to a low drag race wing.

APR gives aero data in the CDF Data section:

I kinda sorta know what's going on here but on this visual above, we basically get the general answers we want. The wing is also around $1,700 so take that as you will and what it's worth for you.

I have this wing. Works well.

 

[Tomster]

We are dealing with a wing which produces lift in the downward direction. The formula you guys are using is specific to parasitic drag and not taking into account the added drag as a byproduct of lift. The lift of the wing will vary with speed based upon the angle of attack, coefficient of lift, and wing area. As the velocity varies, lift will vary, and so will the drag. There are two types of drag associated with a wing, induced drag and parasitic drag. The downward force that the wing is producing on the car is the same as an aircraft wing, which is lift (think of it as an aircraft wing that is up side down). I've been away from the aeronautical university for quite some time now, but I do recall the formula for lift being L = Cl * A * .5 * r * V^2. L=Lift, Cl=coefficient of lift, A=area of wing, r=air density (rho), V=velocity. If you have the data from the manufacturer for Cl and A, you can solve for lift based upon each speed variable. For each speed variable you can then use the following formulas for induced drag and parasitic drag

Induced Drag (Di) can be calculated from the formula Di=L^2/.5 * r * V^2 * A

Parasitic Drag (Dp) can be calculated from the formula Dp=Cd * A * .5 * r * V^2 where Cd is the coefficient of drag.

So call the manufacturer of the wing and get the Cl, Cd, and S for the wing (yea, good luck with that) and chug some numbers. Have fun!

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