65-66 Fastback Aerodynamics?

BALLSTOTHEWALL · Jun 26, 2004

Does anyone have any info on the 65 or 66 fastback drag coefficients or aerodynamics? What is the cd stock? Can it be improved? I have serached stangnet and corral as well as google and I can't find a thing.

Thanks for you help.
Chris

2bav8 · Jun 26, 2004

I think we came up with "aerodynamic as a brick" the last time this question was asked.

dodgestang · Jun 26, 2004

2bav8 said:
I think we came up with "aerodynamic as a brick" the last time this question was asked.

I seem to recall using that line before

BALLSTOTHEWALL · Jun 26, 2004

Thanks for the info guys. I was hoping for some better numbers, but oh well. I have delusions of making a One Lap car with a 66 fastback. Is there any way to clean up the cd, the frontal area isn't that large.

mr-fixit · Jun 26, 2004

I remember reading that the 65-6 Fastback has a better drag coefficient going backwards!

65 fastback · Jun 26, 2004

Back when the car came out there was an aftermarket front end, that was supposed to help the aerodynamics. I've got a link at work, but not here at home. You can try searching Fiberfab Mustang.

But then again, I don't think it was a big seller.

Tim

allcarfan · Jun 26, 2004

look at TCP's old car

zookeeper · Jun 27, 2004

Here's a little info on just how bad the aerodynamics are on older cars: the wipers on my wife's 69 Corvette work when they feel like it. Anyone who's ever seen late '60's/early 70's vette wipers knows how they work with a vacuum trap door, etc. Anyway we got caught in a storm a few years ago, and went to the local parts store to get some Rain-X, which has always worked well. The rain didn't blow off of the Corvette windshield, because the car is so crappy, aero-wise, that the wind didn't touch it! The raindrops just sat there in front of us, not budging at all. I'd also bet money that that generation 'vette is much slicker than our Mustangs with their concave grills, headlights and such...

Route666 · Jun 27, 2004

It's pretty sad, the aerodynamics of the classic stangs. They're all around .55 from what I've heard.

BALLSTOTHEWALL · Jun 27, 2004

Wow, the fiberfab is ugly. I will just make tons of power to push it through the air.
Thanks guys.

none67 · Jun 27, 2004

i beleve that the CD of a 65-66 coupe was 4.2-4.3..

now, i know all the importances of areo. but don't take it like everyone says.. shelby got his 67gt-500 SS to go 175mph at daytona! (as some promo).

usedtobe 67p51d · Jun 27, 2004

in hotrod a couple a years ago there was a guy who was running the silverstate claccic with a '67. he covered the head light buckets with lexan and claimed that it gave him 7 mph...I don't think thay it would be that high. things that I would do for better flow

1. decress the front grill size by adding filler to bring the dead space out to the hood line

2. cover the headlight buckets

3. remove the windsheild wiper, and "ford " letters off of the hood

4.add a front air damn

5. add wedge to the car aka drop the front

Jim

BALLSTOTHEWALL · Jul 2, 2004

usedtobe thanks for the tips. I want the car to look great also, but I will incorperate some changes.

Chris

HistoricMustang · Jul 2, 2004

Here are a couple of things I have done.

Using an aluminum radiator, lexan the grill area. Use the ole duck tape under the headlight buckets and across the underside of the grill. Use a small spoiler and close off the gap between the hood and the top of the radiator. Use hood pins that pull the hood down. No windshied wipers at the track and tape the hood openings if the competition is really tight. I also tape the cowl louvers and get the front of the car just as low as possible. Open the back of the hood a little by putting washers between the hood and the hinges. This lets the air out. I use a plate between the grille and radiator (up top). I use a lexan rear glass with holes cut to let air out of the interior. My interior/vents have been sealed. My louvers on the fastback have a plate instead of the louvers.

Have seen nice looking holes cut into the rear of the car to let air out of the trunk area. Also have seen holes in the rear valance. The really fast rides have no drip rails and have seen the fenders pinned behind the front wheels to prevent air getting trapped.

Let me think some more and when I get some free time will get all of this up at: www.historicmustang.com/tech.html

HistoricMustang
www.historicmustang.com

mdjay · Jul 2, 2004

mr-fixit said:
I remember reading that the 65-6 Fastback has a better drag coefficient going backwards!

That's friggin' funny...

Anyways, you could always make the front end like the original concept car.
http://mustang1.com/mustang1.html

Historic has some real nice ideas. Some are actually in prototype stages as aftermarket parts.

When all else fails, just add more horsepower!

usedtobe 67p51d · Jul 2, 2004

"aerodynamics are for people that can't build motors" Enzo Ferrari

65 fastback · Jul 3, 2004

Hey Historic,

Can you elaborate on the following? I'm getting a lot of front end lift at 90 mph+. I need to eliminate some of the air getting into the engine compartment and having the hood parachute.

lexan the grill area

close off the gap between the hood and the top of the radiator

use a plate between the grille and radiator (up top).

Also, it sounds similar to - http://jmichael.info/docsairfoil.htm

Can you post some pictures?

Thanks,
Tim

HistoricMustang · Jul 3, 2004

Sorry, but this is the best pic I have at the current time. This does show the plate between radiator and grille. Some folks run it to the top of the radiator which is a good idea. Mine actually goes completely around the radiator to keep the air from "moving" around in the front end cavity area. It also forces the air through the radiator as my grille is blocked off using lexan. The only air entering the front of the car is through the "Shelby" opening below the grille. The air enters there and has no where to go except through the grille. It then exits the engine compartment a the rear of the hood which has been opened up slightly, using washers on the hinges, to let the air out.

Between the radiator support and the hood, there is a gap that allows air into the engine bay. This is plugged using foam covered with tape that has been applied to the hood. Sorry no pic but you get the idea. Just take a minute and look under your hood when it is closed and you will get the idea. The foam (covered with nice looking tape) on the hood will sit on top of the radiator support.

Lexan over the grille area is a simple project but I do not suggest this unless you are running an aluminum radiator and the Shelby front apron. The set up forces so much air through the radiator that I do not use a fan at the track. it is not needed.

Hope this helps and I will try to get some more pics.

Henry

HistoricMustang · Jul 3, 2004

Of course that first paragraph should say the air has no where to go except through the radiator. Sorry - I should preview before posting.

HistoricMustang
www.historicmustang.com

Route666 · Jul 3, 2004

Hey Historic, not bagging out your aero work, serious question here:

Are you sure that the air exits the engine compartment through the back of the hood? That area is a high-pressure zone anyways, hence how cowl-induction works, so are you sure it isn't just sucking more air into the engine bay?

65-66 Fastback Aerodynamics?

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