top speed with 430's

5spd GT · Oct 12, 2004

raph130 said:
by looking at what rpm i am at in gear. your friends 2.3l is out of tune. my friend got a $400 ticket for doing 120mph in his 4 banger. you oviously dont know anything about aerodynamics. why does everyone thing the fox body has a problem with speed? ours oviously doesn't if we can hit over 150mph. the car was designed to handle that speed and attain it.

Your kidding right? No the age on these cars (even from the factory) were not made to handle those speed safely...learn to look and think logically...

120mph...no...

boldsword · Oct 12, 2004

5spd GT said:
I have Q-tips....

YOUR car can not do 167mph and neither can your friends car with ya'lls mods...sorry it is just a fact...quit using calculators and factor real world physics into it...aerodynamics...not what it can do on a dyno theoretically...

real world phsyics, heres a bit of real world physics, my car can ond does hit 6000rpms in fifth gear on the highway, the only arguable factor in that statement is the accuracy of the calculator in question, neither raph or myself just sat down one day and said hey, what if we could hit 6000 rpms in fifth what would the theoretical top speed be, this was not the case, the case was "holy **** I just broke 6k rpms in fifth, lemme see how fast that should be" aerodynamics don't play a role in rpm to speed calculations, unless you have bad enough aero that your driven wheels have lifted off the ground and your engine is revving free.

5spd GT · Oct 12, 2004

raph130 said:
your a retard. i guess 2+2=10 to you. i choose to risk my life if i wanna go that fast. i never encounter anyone at 3am on the highway when i choose to go fast. it only takes a matter of secs to reach 150mph or more.

A matter of seconds huh ? Also a matter of seconds to take your own life or that of others...

boldsword · Oct 12, 2004

I Love your straight up responses BTW
120mph...no....
very interesting how you can just decry any statement we could make just by saying no, no need for justification of the statement, just no. I paid $430 for going that fast, and I used rpm calculators to verify that I was indeed traveling at that speed, cars with less then 100 hp are regularly seen going over 120 even some hitting 130-140 on the autobahn. Prove to me that my insurance step is unjustified and then maybe you can call the insurance magistrate for me and explain to them that it was'n't possible for me to hit that speed

5spd GT · Oct 12, 2004

boldsword said:
no need for justification of the statement, just no.

.

Michael Yount · Oct 12, 2004

raph - everytime you post it gets funnier and funnier. 225HP = 150 mph in a stock Stang. That's a good one.

I hearby announce that Raph wins the StangNet monthly "I only open my mouth to change feet" tee shirt contest. It, like the check, is in the mail!

The power required to increase speed and overcome aerodynamic resistance increases with the cube of the % increase in speed.

So, here's how it works. Let's say a stock stang puts down 190HP at the rear wheels and with the 2.73 gears is capable of about 135-140 mph (that's about right for a stock car, even though raph's will go 150 ). So, for the purpose of the calculations, let's assume 135 mph. 165 mph is 22% faster - or a factor of 1.22 faster. Cube that and you get (1.22X1.22X1.22=1.83) 1.83. It will require 1.83 times as much rear wheel HP to push the car from 135 to 165 -- 190 X 1.83 = 347HP at the wheels, or about 420HP at the crank. So, to get another 30 mph of top speed requires almost twice as much crank HP as the stock engine. This assumes you've geared the car to hit top speed at the power peak in one of the top two gears.

If you wanted to hit 200 mph based on the same math, it would take 600 rwhp to do so.

It's not a perfect approximation, but it is close. And it makes some sense. The new Corvettes which are MUCH more aerodynamic than a fox body Stang, seem to regularly trip the rollers at around 350-360 rwhp - and they need that to hit 175-180 mph.

Raph - I suspect you've confused the numbers some calculation spits out with what will actually happen when you try to force the car through the air at those speeds. No doubt the rpm/gear calculation says 150 mph in 4th gear is possible -- but in a stock Stang, the HP is simply not available to make that happen. It will run into a wall of air somewhere around 135-140. You might do a bit better with a shorter gear - as it would allow the engine to pull further up into the power band at speed.

TRWXXA · Oct 12, 2004

I like the way you think, Michael! You got the science down.

If someone tells me about getting their stock 5.0L Foxbody up to 160mph, I raise the too.

If someone tells me they got theirs up to 145, I might believe them. There can be a great deal of difference in the power output of massed-produce engines. It's quite possible they got one that's putting out a few more ponies than the average.

Can't forget some kind of non-linear speedometer error too. I know C&D magazine tested some high-end, exotic sports cars a few years back. It seemed that $250K+ wouldn't guarantee a accurate speedometer. Some of them were reading as much as 20mph too high towards the top end.

need a fast car · Oct 12, 2004

DAMN look what I started LOL! 90lxcoupe is right, it almost like it a rule or a understanding that 4.10's are the steepest gear to go. I will probably never go to 150 mph, so having gears that will go 190 mph makes no sence If i'm never going to go that fast. why not just go to 140 but get there really fast. thanks for those sites guys. I would probably use 4.10's or possibly 4.30's when I get a turbo but that will be later on down the road.

Hissing Cobra · Oct 12, 2004

My twin brother (Retro 5.0) and I just installed my 4.30's in my 8.8 last week. I do not regret my decision at all. Sure, you do cruise at a little higher r.p.m.'s, but the trade-off is much better quarter mile times.

I do have a Tremec 3550, but I do not know the exact speed at which I'm cruising on the highway, as Ford does not make an accurate speedometer gear for the transmission (with those gears.) I'm guessing that it's about 20 mph off. With my high revving engine (6,800 rpm shift point) I would estimate that I could go 150 mph with those gears (although I'd be an idiot to be travelling that fast on a public road.) Also, with a speedometer that's already 20 mph off, and only has an 85 mph top reading, it really doesn't matter!

Anyway, I can get in the far left lane on the highway and cruise right on by everyone-for miles on end without nary a worry. It moves right along and if I had to guess, it's probably only 1,000 rpm's, tops, above my stock 7.5 rear with 3.45 gears. To be honest, I've never bothered to watch my tach while on the highway. I just know that it's comfortable to be moving either at the same speed as traffic flow or even quicker than traffic flow. Having 4.30's does NOT prevent you from cruising comfortably at 75-80 miles an hour (provided you have an overdrive in the tranny.)

For what it's worth, those gears, plus the addition of upper/lower control arms and a Detroit Locker NoSpin unit, dropped my quarter mile times already by 8 tenths of a second with more to go.

Like someone already said, "Don't Fear The Gear!"

willys1 · Oct 12, 2004

need a fast car said:
DAMN look what I started LOL! 90lxcoupe is right, it almost like it a rule or a understanding that 4.10's are the steepest gear to go. I will probably never go to 150 mph, so having gears that will go 190 mph makes no sence If i'm never going to go that fast. why not just go to 140 but get there really fast. thanks for those sites guys. I would probably use 4.10's or possibly 4.30's when I get a turbo but that will be later on down the road.

If your gettin a turbo I would go 355's,or maybe 373's

willys1 · Oct 12, 2004

With all due respect guys,back in the day when they were new,Car and Driver tested a new 5spd GT and did 148.

need a fast car · Oct 12, 2004

no way in hell I would put 3.55's in my car. dont flame but my old car.........a 91 240SX with a turbo charged engine running 12lb's. the car didn't make much power above 5500 and the car came stock with 4.10's (like 4.012 something). I was going to put 4.6's in it. that way I could utilize my 4th and 5th gear instead of staying in 3rd forever. YES I do understand that the gearing in the tranny is different and the engine has no torque, but the concept is still the same.plus lets say if you had like a t67 that spooled around 3k ish those gears would just through you right in your power band. imagine 3rd and 4th gear in a car with a t67 and 4.30's getting ready to order that pro bullet!

5spd GT · Oct 12, 2004

need a fast car said:
no way in hell I would put 3.55's in my car. dont flame but my old car.........a 91 240SX with a turbo charged engine running 12lb's. the car didn't make much power above 5500 and the car came stock with 4.10's (like 4.012 something). I was going to put 4.6's in it. that way I could utilize my 4th and 5th gear instead of staying in 3rd forever. YES I do understand that the gearing in the tranny is different and the engine has no torque, but the concept is still the same.plus lets say if you had like a t67 that spooled around 3k ish those gears would just through you right in your power band. imagine 3rd and 4th gear in a car with a t67 and 4.30's getting ready to order that pro bullet!

You better get ready to put money into your suspension...your going to have huge traction problems...430's is to much for what you have planned...

And your right...the 240SX and 5.0 are completely different...it is not good to compare those two cars with the same style gear...

Imagine what your car will do in 1st and second gear No traction and your tranny is going to be gone if you get some somehow...

Is this your daily driver...if so I strongly advice against it...

need a fast car · Oct 12, 2004

geting MM starter pack lca's and full subs. with the turbo I'm wanting to run and with the engine I will make power till about 6500. 4.30's sound nice! as far as the tranny If and yes when my 3550 bites the dust time for TKO.

5spd GT · Oct 12, 2004

need a fast car said:
geting MM starter pack lca's and full subs. with the turbo I'm wanting to run and with the engine I will make power till about 6500. 4.30's sound nice! as far as the tranny If and yes when my 3550 bites the dust time for TKO.

Is this your daily driver?

90mustangGT · Oct 12, 2004

This thread got F'd up!

Going 140+ in a stock suspensioned foxbody is about suicidal, but to each his own, it's not my life. The probem with the foxbody at higher speeds is that it is not aerodynamic at all. I don't know what made them design the foxbody the way they did, but one thing is for sure, the wind tunnel had no influence in the desing. Not only is the design restrictive but it also is an unstable design. I've hit 140+ a time or two, and I am not anxious to do it again. The stock 5.0 Foxbody in good condition is very capable of near 150mph.

I'm not going to argue, because I really don't care about top speed, except fot the top speed I can get in a considered distance, such as the 1/4 or 1/8th mile marker.

need a fast car · Oct 12, 2004

yeah this thread is f'd up! haha. yeah its gona be a daily, when ever I get all this stuff on the car and if it needs a lower gear I will let all of you know so you can make fun of me. I just didn't know if the 4.30s would cut out at 130 or something I wouldn't want that. oh lets let this thread die!

dkhl · Oct 13, 2004

It's really quite simple.

If you wait 1500-3000 miles to change your oil, it WILL get dirty. Don't BS about it being nice and clean. How do I know? I change oil everyday, I work at a Mechanics shop and there are some people with nice rides who baby the **** outt of their cars and they still get extremely dirty oil sometimes.

You will not go 120mph in a 4 cylinder... espescially at 95 horsepower. It would take you a while to get up to that speed because of lack of torque, and 95 horses wont push you up to 120mph. My moms '01 Echo has roughly 100 horses, and trust me.. it rarely sees anythinng past 160kph (100 mph).

While it is true, for the most part that you can probably have a liveable fuel economy with deep gears like 4.10's and 4.56s is it really practical? What are you trying to prove? Why not just put that money into rebuilding the motor with beefier components. I'd be much more impressed to see someone build an awesome 5.0L motor than say oh.. he's got 4.56 hes GOTTA be hella fast..

5.0L = good power / lower rpms.. If you want a high revving, top speed crazy car, you either go FErrari (which i dont think many of us can afford) or you find a nice little import, which at this point might be more suited to you.

grrrrrrr · Oct 13, 2004

Finally someone got the point. We have a couple of super-genius 12 year olds running around at top speed (whatever that may be). And thank God we have a scientific mind present, Michael Yount; I applaud you for trying to prove mathematical concepts to the ignorant and rediculous. Rahp130 and boldsword, it's amazing that out of millions of sperm, you two were the quickest, the miracle of human life never ceases to amaze me... Do you guys have jobs? Where do you live? I've got a couple of paychecks against your cars and a radar gun says you can't hit 167. To top it all off we'll throw a brick wall into the equation and end the lunacy... I inspect your cars just to keep things honest, you guys get to go fast, and we all get to laugh... I'll even donate the money to charity. What do you say?

top speed with 430's

raph130

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