This is topic Aerodynamics in forum Tech Talk at Northern California Ford Owners  .


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Posted by Blown Mystic (Member # 476) on :
 
How fast can I go in my 96 Cobra before aerodynamics will put me in danger?? I have the griggs setup if it matters.

[ May 15, 2003, 12:27 PM: Message edited by: Blown Mystic ]
 

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Posted by 88gt (Member # 579) on :
 
It's always an issue.

I don't think your question is very clear.
 

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Posted by Blown Mystic (Member # 476) on :
 
Ok, If Im doing 175mph will my car flip with a small gust of wind.
 

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Posted by 94Blackout (Member # 2541) on :
 
I'm gonna go out on a limb here (heavy sarcasm), but you aren't doin 175 in your car.

If you want to be hypothetical, there wouldn't be enough lift at 175 mph with the shape of a Mustang to take flight unless you hit a large bump to act as a ramp. Even then you wouldn't be "flying", it would just be physics.

I guess what I'm gettin at is don't worry about it.

edit: Those F1 kart racers are the only cars that aerodynamically speaking are able to simply "fly" becasue of excessive undercarriage lift.

[ May 15, 2003, 12:49 PM: Message edited by: 94Blackout ]
 

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Posted by shade-tree (Member # 298) on :
 
the rear end of a mustang can get very light at speed--- I guess I'd take it to Watkins Glen and get a few laps in and work your way up, you'll feel it if there's any problems.

and his car has enough power to push past 175 FYI.
 

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Posted by Red97SVT (Member # 2811) on :
 
Well I before I saw that you have a Vortech, I was going to say you can't hit 175.

At those speeds you would want to keep air out from under the car and improve down force. This is the reason the 00R has the splitter and the big wing. Will it flip? I dunno. Who can say. The problem is that it costs BIG $$$ to wind tunnel test at those speeds and as far as I know nobody has done it with the 94-98 Mustang. Ford may have with the 00R but I'm not even sure about that, probably just did computer modeling or some such thing.

I have often wondered if a Saleen front and rear would help with high speeds. There was a guy John Buscuma (spelling?) that was trying to hit 200+ in the Silver State. He had a web site with a lot of pictures which showed some of the areo mods he had made. MM&FF or 5.0 did an article too a year or 2 ago.
 

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Posted by 94Blackout (Member # 2541) on :
 
Even with a blower, 175 seems a bit high to be hittin on a track. But all the more power if you want to try.

Obviously handling will be an issue at that speed, but only side to side; having the front end flip up on you would be VERY hard to do. I'd worry about roll more than lift.
 

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Posted by season'd 88 (Member # 169) on :
 
if your considering the silver state challenge or whatever its called, those roads from battle mtn. to austin can throw a big cross wind at ya and there are some healthy dips as well as !!!!WAS THAT A FRIGGEN COW!!!! yes its open range. as far as aero goes, only one way to find out.
 

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Posted by BlackDrop50 (Member # 1715) on :
 

quote:

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Originally posted by 94Blackout:
I'm gonna go out on a limb here (heavy sarcasm), but you aren't doin 175 in your car.

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1 alphanumeric - 460rwhp
 

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Posted by Blown Mystic (Member # 476) on :
 
Im pretty sure I could get it up to around 180mph, but I'm just not sure how stable/safe it is. I wish I had the money to put a front splitter on. The reason Im asking (I wish I could afford silver state races) is Ill be going down I5 and was hoping to hit a few open miles. I probably wont go past 160 for now, untill I get an aftermarket speedo
 

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Posted by 94Blackout (Member # 2541) on :
 
Well, good luck brother. The best stretch is 90 miles before the Grapevine, in Kerns county. Flattest grounds, but also best for gettin a crosswind. Drive safe!
 

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Posted by Blown Mystic (Member # 476) on :
 
I only need about 4 good miles
 

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Posted by Blown Mystic (Member # 476) on :
 
anybody else got a clue?
 

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Posted by 87 Saleen (Member # 1549) on :
 
Hey this is off topic a bit, but what have you done to your suspension and how much money did it run you? was it worth it for you? I been thinking that after i finish this 65' im going to make a gr350 or a nice open track car.
 

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Posted by Blown Mystic (Member # 476) on :
 
I have the Griggs auto-x/opentrack kit. It runs over 5k in just parts alone. I havent been able to take it into the turns yet, but Im getting it tomorrow, and I'll let you know how it is.
 

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Posted by Black94 5.0 (Member # 655) on :
 
Well, to answer your question, anything past 120mph your gonna need a lot of extra down force...I'm talking from experience...

I've taken my car to around 160mph...5,000rpm+ in 5th gear with 3.55's.....

My car was extremely light!...At top speed it required A LOT of steering input just to change lanes...

Front chin spoiler's are to direct air around the car and keep it from getting air underneath the car...If you get air under the car its NOT going to flip , its gonna lose grip with the road and probably make you loose traction like you would in the rain only your going a lot faster ...

The rear wing/spoiler holds the car down and gives a lot of downforce to the car....The '00 Cobra R Spoiler add over 200lbs of downforce at only 120mph(So I've heard).....

Basically your car will be extremely light at 175mph....Whatever downforce you can add will be great....

[QUOTE]((94Blackout)): Those F1 kart racers are the only cars that aerodynamically speaking are able to simply "fly" becasue of excessive undercarriage lift.[END QUOTE]

-What are you talking about? :rolleyes:First of all F1 and CART are 2 different types of cars..Second of all, (FACT):Did you know that an F1 car, hypothetically, has enough down force to hold itself to the roof of a tunnel at only 120mph!! ...Any car going fast enough and gets enough air under it is goin to take flight...I've seen it in Nascar, F1, Cart, Indy, and especially the LeMans cars...

[ May 16, 2003, 12:29 AM: Message edited by: Black94 5.0 ]
 

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Posted by Red97SVT (Member # 2811) on :
 
The likelyhood of you taking off like an Indy car (the clip od Andretti taking fligt in testing not to long ago) Is slim to none. The biggest problem is getting light in the back end. When this happens you lose traction and can get "a bit squirrely". When this happens you disrupt the air flow over the car. With the air flow messed up you lose what down force you had. Now you have it now you don't, next thing you know your sideways and its all over. All of this happens in a split second.
 

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Posted by racercosmo (Member # 1864) on :
 

quote:

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Originally posted by Black94 5.0:
((94Blackout)): Those F1 kart racers are the only cars that aerodynamically speaking are able to simply "fly" becasue of excessive undercarriage lift.[END QUOTE]

-What are you talking about? :rolleyes:First of all F1 and CART are 2 different types of cars..Second of all, (FACT):Did you know that an F1 car, hypothetically, has enough down force to hold itself to the roof of a tunnel at only 120mph!! ...Any car going fast enough and gets enough air under it is goin to take flight...I've seen it in Nascar, F1, Cart, Indy, and especially the LeMans cars...

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quote:

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Originally posted by Black94 5.0:
DUDE!...I just got the new July issue of 5.0 Mustang and Super Fords!!....

Its got a 622rwhp T-Trim Vortech Supercharged 4v 4.6 in a Mystic Cobra that can run 200mph!!!....Its actually going for a 90mile 200mph average!!!!.....The ONLY aerodynamics mods are that it has is a huge rear spoiler and a fiberglass hood....

Thought you guys might be interested.....

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quote:

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Originally posted by 92coupe:
i dont know abotu fliping, but getting sideways would make me nervous. ive gone 157mph in my stock body 92 lx with out any problems. that car was also stock minus an off road h-pipe so i bet he could hit 175mph easily.

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quote:

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Originally posted by GOT 50:
bullshit. 157 in a stock stang. I hit 139 with bolt ons and that was about a 20 mile strech of freeway. Oo if you dont belive me i have it on video tape..

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now i dont know if this is fox vs sn...but ok. I dont have it one tape, but one time down 580 i grew some balls when NO one was around and did 139-142
for about 2miles and it started to shake so i backed it down. I have 1chamber flows, i tell u it was fun as FU** though
 

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Posted by Blown Mystic (Member # 476) on :
 

quote:

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Originally posted by racercosmo:
What RPM at 130? Shifting to fifth with the stock 0.62 overdrive is like dropping the anchor, especially with stock gears.

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quote:

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Originally posted by SlowAss01:
mystic i thought you were selling your car?

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quote:

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Originally posted by Blown Mystic:
200mph is my goal, but I dont know if Ill see it anytime soon.

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Mine too.
 

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Posted by Blown Mystic (Member # 476) on :
 
If I dont sell my car, we can race from a dead stop to 200mph
 

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Posted by 91sleeper (Member # 779) on :
 
I am sure your car would hit 170 just fine. When I used to have an overdrive on my tranny before it blew I used to hit 140 know problem and my motor is pretty stock.

Just watch out for those bridges that they have on the freeways, those things are huge bumps at 140mph.

I think this is the reason for my tranny blowing up too. Too many 140mph runs.
 

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