TRWXXA
Member
That's "F**cked^3", isn't it?F=3200x268mph then F in this example actually will equal F**cked when you hit that immovable wall
5.0 theoretical top speed?
- Thread starter Hi-Po
- Start date
-
Sponsors (?)
TRWXXA
Member
I know that was over 160 in their fox on a closed off track that told me it was rather stable...
Rather stable... that's a relative term... It must mean I would want my relatives to come visit me in the hospital when a gust of wind flipped my stang...
I've hit 160 twice in my 4 eye. I was actually trying to work out whether the chin spoiler I'd installed was having any stabilizing effect (it does by the way).
I'd purchased, cut, and shaped a chin spoiler from an 89 Bronco to fit up under the front of my Fox. Not only was radiator cooling much improved, but stability was GREATLY improved. Prior to the addition, 120 MPH was a bit hair raising. After the spoiler, 120 was a very casual one handed steer affair. I'd hit 160 a couple of times to see how far it would go before it became hair raising again. 145 was where it began to become uncomfortable. 160 is definitely a two fisted affair.
I run well in excess of 400 HP to the rear wheels and did have a 2:73 rear end at the time. The car was still able to accelerate in 5th gear but I wasn't.
To this day, I still do not know how fast the car will go. I probably never will.
I should probably add that the front air-dam ads a pretty significant amount of drag. Thing is... it also keeps the nose down. All that air that would have gone under the car is not forced around and over. The air-dam sits just a little over 3 finger's width from the road surface.
I'd purchased, cut, and shaped a chin spoiler from an 89 Bronco to fit up under the front of my Fox. Not only was radiator cooling much improved, but stability was GREATLY improved. Prior to the addition, 120 MPH was a bit hair raising. After the spoiler, 120 was a very casual one handed steer affair. I'd hit 160 a couple of times to see how far it would go before it became hair raising again. 145 was where it began to become uncomfortable. 160 is definitely a two fisted affair.
I run well in excess of 400 HP to the rear wheels and did have a 2:73 rear end at the time. The car was still able to accelerate in 5th gear but I wasn't.
To this day, I still do not know how fast the car will go. I probably never will.I should probably add that the front air-dam ads a pretty significant amount of drag. Thing is... it also keeps the nose down. All that air that would have gone under the car is not forced around and over. The air-dam sits just a little over 3 finger's width from the road surface.
Legacy5.0
Member
Funny that my AOD exhaust only stang could hang with a 98' Camaro SS up to the threshold of 150...
My father and a friend of his tested that theory one day; the day the spare tire stayed home.
Legacy5.0
Member
Figure 40 MPH per 1000 RPM using 2.73 gears and 225-60-15 tires. Turn 5000 RPM and that is 200 MPH. Of course, the car will go faster in 4th gear than 5th because the stock engine does not develop enough power to make the RPMs top out in 5th gear.
Is there any way i could get these tailored to an aod's gear ratios? I'm trying to figure what my rpms would range on the highway (most of my driving is done there), mostly between the speeds of 55 to 75 mph. I know my aod with 2.73s cruises at about 2,000rpm at speeds of 75 - 80mph.
Shaolin Crane
Banned
Believe it or not Shaolin schooled me on the aerodynamics of the stang. It has less coefficient drag that you would suspect. I think he said like .38 or something close to that.
I can remember an article 5.0 did where they built a 500 rwhp machine to do the race in Nevada and their goal was 200+mph and they hit it. Only thing they did for aerodynamics was front chin spoiler, lowering and a functional rear wing. I have heard of someone I know that was over 160 in their fox on a closed off track that told me it was rather stable...
Whats that supposed to mean?
My fox is VERY stable at the 130mph+ speeds
I dont think that post about the cup car needing 860hp to go 220mph, remember those motors are meant to breath and more often than not they have VERY steep gear ratios, 4.10+ not only are they meant to haul ass they are also supposed to get there as fast as possible
Look at the lambo and ferrari cars, most of them make 500-600hp and they all go upwards of 200mpg with the same drag coefficient
If you want a stable top speed fox you need a few things
Front air splitter, a real one something that attatches the the base of the bumper
Vent reliefs in the hood, this does multiple things, but mostly removes air wash that gets trapped under the hood and causes the front end to lift
a GOOD rear spoiler, something laser cut and stainless or thick carbon, no mr body kit **** here
and IIRC the GT rear bumper is better for the low pressure area behind the bumper than any other bumper for our foxes, i BELIEVE i read that over on c-c
TRWXXA
Member
Someone should have stayed awake in Algebra 101.
Here are the formulas you need to make your own chart specifically tailored to your car:
MPH = Tire Height × 0.002976 × Eng. RPM ÷ Trans. Gear Ratio ÷ Axle Ratio
or, if you want a chart that will show RPMs at different speeds...
Engine RPM = 336.1352 ÷ Tire Height × Axle Ratio × Transmission Gear Ratio × MPH
Tire Height (in.) = Tread Width × Aspect Ratio ÷ 1270 + Wheel Diameter
Example: 215/65R15 -- 215 (tread width) / 65 (aspect ratio) R 15 (wheel diameter)
215 × 65 ÷ 1270 + 15 = 26.00”
AOD gear ratios are:
1st -- 2.40:1
2nd -- 1.47:1
3rd -- 1.00:1
4th -- 0.67:1
You could make a spread sheet in MS Excel, or just bang out the numbers for any speed or RPM you want to plug into the formula
TRWXXA
Member
Nice grammar.
What's your point? You "don't think" what? Of course, whatever it is you "think", you can back up with math and scientific data, right?Let's not forget that race cars are designed to generate LOTS of downforce. That downforce also creates drag. The faster a race car goes, the more drag that is created by the production of the increased downforce. This drag compounds the drag already being produced just by the speed of the car.
And, seriously, are you saying that because a Ferrari can hit 200mph on 513hp (F50), a Fox Body could too?
I'm calculating you might get 185mph out of it, but it would take about 635hp to hit the double-century mark.
fiveohwblow
Official Member
- Jul 21, 2005
- 2,169
- 145
- 135
Ok. We could sit here and argue semantics all day along with a theory thrown in for good measure. Reality is, that individual walked away to tell the story didnt heRather stable... that's a relative term... It must mean I would want my relatives to come visit me in the hospital when a gust of wind flipped my stang...
If you prefer to keep your desk stable with your computer chair I wont knock you, but clearly some enjoy an adrenaline rush. Also to be noted, you never knew what was done to this vehicle for stability at speeds
Whats that supposed to mean?
My fox is VERY stable at the 130mph+ speeds
I dont think that post about the cup car needing 860hp to go 220mph, remember those motors are meant to breath and more often than not they have VERY steep gear ratios, 4.10+ not only are they meant to haul ass they are also supposed to get there as fast as possible
Look at the lambo and ferrari cars, most of them make 500-600hp and they all go upwards of 200mpg with the same drag coefficient
If you want a stable top speed fox you need a few things
Front air splitter, a real one something that attatches the the base of the bumper
Vent reliefs in the hood, this does multiple things, but mostly removes air wash that gets trapped under the hood and causes the front end to lift
a GOOD rear spoiler, something laser cut and stainless or thick carbon, no mr body kit **** here
and IIRC the GT rear bumper is better for the low pressure area behind the bumper than any other bumper for our foxes, i BELIEVE i read that over on c-c
I worded it poorly. I meant to say believe it or not the fox has a lower coefficient drag that you think, and ALSO that you taught me that. I was crediting the source
Also, what you finished in your post is exactly what I was talking about in my first. Chin spoiler, coilovers and more functional rear wing is all the fox needs
Shaolin Crane
Banned
Nice grammar.
Let's not forget that race cars are designed to generate LOTS of downforce. That downforce also creates drag. The faster a race car goes, the more drag that is created by the production of the increased downforce. This drag compounds the drag already being produced just by the speed of the car.
And, seriously, are you saying that because a Ferrari can hit 200mph on 513hp (F50), a Fox Body could too?
I'm calculating you might get 185mph out of it, but it would take about 635hp to hit the double-century mark.
Jeez i made the post late an night for ****s sake
And i never said it wouldnt take over 800hp to hit more than 200mph, im saying there is far more things going on than power to achieve those speeds. First off a standard body fox will NEVER reach 200mph even with 800hp+ the front end of the car will lift away from the ground far before that. Talk to cops who drove the SSP coupes back in the 80's and 90's during pursuits the could feel the steering move side to side and high speeds but the car wouldnt change course.
So if you're going to be a dick about it, did you factor in ALL the variables on how you'd achieve or wont achieve 185 mph? Including lowering the car, types of spoilers needed, air splitters, chassis modifications?
Also have to take in to account how the motor makes power, wheres its power band, is i geared for low end, was the motor engineered to make more torque or more horsepower, what rpms does it run to?
What about the tires?
What about brakes?
What about wheels?
BTW the 1995 F50 has a drag coefficient of .372 as well, wow now thats odd, must have more to do with just drag coefficients huh?
F50 generates 970lbs of downforce at 202mph
Not spectacular is it?
But extra points for being a tool
fiveohwblow
Official Member
- Jul 21, 2005
- 2,169
- 145
- 135
TRWXXA
Member
Extra points!!!! WOOHOO!!!
OK. We're basically on the same page. Since the topic is "theorectical speed", I did not factor all the practical things that would need to be done to actually achieve 200mph in a Fox Body. 635hp would be the power needed to do it, but that doesn't mean that it wouldn't achieve liftoff before then.
In practicality, you would have to make all kinds of aerodynamic changes to keep a Fox Body planted on the ground at those speeds. Those changes would also change the drag coefficient. A slick beast like the Ferrari F50 has a Cd that high because of all the ground effects it has to keep it from flying. It also has an engine/transmission combination that gets up into the power band fast and stays there. The problem with our cars is getting up the power curve before the drag curve overcomes it.
Back to theory... They say, "Speed costs. How fast do you want to go?" If you want to go 150mph in our 140mph cars, you're gonna need more oomph than some simple bolt-ons will provide. That little 10mph increase requires almost 25% more power to the rear wheels. 160mph would need 50% more.
Shaolin Crane
Banned
Extra points!!!! WOOHOO!!!
OK. We're basically on the same page. Since the topic is "theorectical speed", I did not factor all the practical things that would need to be done to actually achieve 200mph in a Fox Body. 635hp would be the power needed to do it, but that doesn't mean that it wouldn't achieve liftoff before then.
In practicality, you would have to make all kinds of aerodynamic changes to keep a Fox Body planted on the ground at those speeds. Those changes would also change the drag coefficient. A slick beast like the Ferrari F50 has a Cd that high because of all the ground effects it has to keep it from flying. It also has an engine/transmission combination that gets up into the power band fast and stays there. The problem with our cars is getting up the power curve before the drag curve overcomes it.
Back to theory... They say, "Speed costs. How fast do you want to go?" If you want to go 150mph in our 140mph cars, you're gonna need more oomph than some simple bolt-ons will provide. That little 10mph increase requires almost 25% more power to the rear wheels. 160mph would need 50% more.
Or you would need chassis changes to achieve those speeds as well, more often than not, that needs to come before more power.
Remember the drag coefficient im referring to is a GT model, while an LX coupe model has a drag coefficient of .30, substantially less than a GT. But im sure you can easily increase downforce and keep the same drag with engineering, i mean how else can a 290rwhp mustang like MM's and Griggs hit 160mph? And stay there
1987LXragtop
Member
1987 Mustang LX Super Street Freak- Muscle Mustangs & Fast Fords Magazine
160 mph. I imagine with a different gear set and aerodynamics you could squeeze out 200 mph on the salt flats.
160 mph. I imagine with a different gear set and aerodynamics you could squeeze out 200 mph on the salt flats.
fiveohwblow
Official Member
- Jul 21, 2005
- 2,169
- 145
- 135
http://www.youtube.com/watch?v=Rx8FF1eW79Y
Think about it. this car is doing 153 in just the quarter mile with ZERO and I mean ZERO enhancements for aerodynamics and downforce. Probably at 160 before he lets off. Easily do the three mods I have referenced and 200 mph isnt too scary in a fox. Then again in all fairness, what car isnt scary at 200?
Think about it. this car is doing 153 in just the quarter mile with ZERO and I mean ZERO enhancements for aerodynamics and downforce. Probably at 160 before he lets off. Easily do the three mods I have referenced and 200 mph isnt too scary in a fox. Then again in all fairness, what car isnt scary at 200?
Shaolin Crane
Banned
Uhm he has a cowl hood, and im sure if he has twin turbos and running 8's i'd guess he doesnt have a stock block. So meaning he probably has an extra 100lbs easily up front, thats gonna help keeping the front end down
TrophyHead
15 Year Member
Back in the early 90's JBA built a Fox Mustang that did 175mph pretty easily as far as mods went. Remember the RED LX with the huge road race fender flares. I beleive they used a mild 351W.
A de-stroked motor...ect...ect? If you had the money you could make these cars be in Nascar circuits.
A de-stroked motor...ect...ect? If you had the money you could make these cars be in Nascar circuits.
Good stuff in here, its been a while since I have seen actual thought and math go into a 5.0 talk thread
Shaolin Crane
Banned
Good stuff in here, its been a while since I have seen actual thought and math go into a 5.0 talk thread
thats cause strype doesnt venture here anymore lol
Similar threads
- Locked
- Locked
