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post #1 of 62 (permalink) Old 07-17-2002, 04:24 PM Thread Starter
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fastest in a 4.6

whats the fastest in a 4.6 have you gone i have gone 110 once but only have a shot of going a lil over 100MPH in my sig

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post #2 of 62 (permalink) Old 07-17-2002, 04:43 PM
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well...

I hit 115mph but it was scary as hell. The car was all over the road. I wont do it again. The car is alright up to about the 98mph mark, after that you better be holding on. It was just swaying around the road. I also dont think its to good on the stock driveshaft.

BTW: I think mine does that because I got Cobra R's on my car. Before I put them on I could get up to 100 and it was fine. Also need to replace some bushings.
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post #3 of 62 (permalink) Old 07-17-2002, 04:45 PM
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the fastest anyone is going to go in a stock 4.6 is 106. now if you are talking about chipped birds, thats a different story

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post #4 of 62 (permalink) Old 07-17-2002, 04:52 PM
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well I've had mine up to 125.

I would have gone higher but my driveshaft won't handle it yet I still have to get an alluminum one.
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post #5 of 62 (permalink) Old 07-17-2002, 04:53 PM
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You can hit 108- 110 in a 94 stock 4.6 in 3rd gear when you shift into 4th it cuts it down to 105 - 106. Difference in speed between driveshaft limiter and the top speed limit.


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post #6 of 62 (permalink) Old 07-17-2002, 04:56 PM
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A few months ago...

driving back from Jery's Dyno Fest in Cali I took my
'Bird up briefly just to see what she would do. Mind
you, I had good Z-rated tires and upgraded drive shaft
among other mods, and she hunckered down and suprisingly
easily pulled to 120+ before I let off - I didn't want to
loose my oem torque convertor. With a few more mods I'm
hoping to hit 140+ by the end of the summer....we'll see.

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post #7 of 62 (permalink) Old 07-17-2002, 05:10 PM
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mine doesn't take very long at all

to reach 120 it gets there rather quickly if you ask me and with the assistance of the nitrous that I'm in the process of reinstaling on my car now that I have more things done to it I will be able to get it up that much and more.
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post #8 of 62 (permalink) Old 07-17-2002, 05:18 PM
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Talking What a trip....

I'd love to fly one of those other "'Birds" you
work on....if I had the rating, that is.

Mager Thom CFII

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post #9 of 62 (permalink) Old 07-17-2002, 05:37 PM
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110mph..

but that is because I had 235/70-15 tires at the time. the speedo read 105, but my friend in my SHO said the SHO's speedo (correct) said 110mph.

btw, I thought it was 105mph?




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post #10 of 62 (permalink) Old 07-17-2002, 05:42 PM
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In approx 12.8 seconds I reach 109 and change in the 1/4 mile, does that count? Fastest I've gone was 120 mph because that's where the speedo stops. Also, the drag strip wasn't long enough to haul it down safely, but I think it reached 130 or so.

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post #11 of 62 (permalink) Old 07-17-2002, 06:17 PM
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Talking

Cruising at 130 between Amarillo and Dallas last fall for miles at a time.
Good suspension and both hands on the wheel.
Very little vibration from my car with the 17's. It sucks down to the road at about 90 and just gets tighter.

Most fun I ever had was with the Texas TCCOA guys making power and drag racing.


Now I am using a 2001 BMW M3 Vert for fun.
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post #12 of 62 (permalink) Old 07-17-2002, 06:35 PM
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Thumbs up Hmmmm, I guess it's really true then....

that our "Bird's" shape really was developed for
those high speed track boys.......

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post #13 of 62 (permalink) Old 07-17-2002, 07:32 PM
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Talking I got to 130MPH!!!! w/my 145 speedo.....had to slow down or miss my exit n/m

n/m
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post #14 of 62 (permalink) Old 07-17-2002, 08:17 PM
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Talking 140! Well, thats what the math tells me anyway..

I have a 2000 GT engine in my 94 with 3.27 gears. At 2000 rpm It's doing 70 mph. Well one Saturday night I got it up to 4000 rpm before I let off. The rate at which I was catching up to the traffic ahead of me was a trip!! Anyway if 2000 rpm is 70 mph then 4000 rpm is 140, right?


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post #15 of 62 (permalink) Old 07-17-2002, 08:32 PM
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as long as the TC is locked up, yea. thats how i figured i was doing 140 sometime last year. never again will i try that tho.

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post #16 of 62 (permalink) Old 07-17-2002, 08:34 PM
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huh?

Well I dont want to start any problems but... I dont think rpms work like that. I can slam on the gas and hit 5500rpm does that mean im going 160mph? no. Let see if i can gather thought in my head here.

I believe that I faster you go the faster you engine has to spin to go that speed. (duh) But you get fiction in there and it slows stuff down. So yea your car goes 70mph @ 2000rpms but the faster you go the more fiction on your car (road/wind) So if your going at 4000rpm's that doesn't mean your going at 140mph. I hit speeds of 90-95 everyday. and i believe at 90-95 im at around 3200rpm. And I can also do 70mph @ 2000rpms So if that math works out. At 4000rpm I might only be going at 110-115mph

Well if anyone understood that they are doing good. And if you did am I right or wrong?
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post #17 of 62 (permalink) Old 07-17-2002, 08:39 PM
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rpms do work like that. i am reminded of a heated debate i had with a friend of mine about this years ago in regards to his mustang vs. a tbird.

this was back before i was into thunderbirds, but i still argued the point avidly. he argued that even though both had the same engine, transmission and rear end the tbird would be going slower at the same engine speed in the same gear than the mustang, due to weight. this is simply not true. there is friction that will give force against the car, but parts wont slip (except the TC) enough to get any tangible difference at speed.

so yea, IMHO you are wrong. rpms are rpms, double the rpm and you double your final speed.

also, your example of punching it from a stop and not going 150... you are still in first gear, maybe second if you are putting down some decent power. your rear tires are spinning as fast as your speedo says. true they arent going 150, but if you had the power to spin them up that fast through all the gears from a dead stop, they would be.

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post #18 of 62 (permalink) Old 07-17-2002, 08:49 PM
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Talking Without getting into an incredibly...

complicated monlogue, BlackTbird96 might be approximately
correct. There are three types of drag and two forms of
drag....suffice it say, drag increases as a function of
the square of its velocity....in other words drag increases
are not linear with respect to speed...more like four times
an increase as speed doubles....despite the excellent contours
the designers gave our 'Birds for the high speed tracks,
the drag loads above 100mph are horrendous....so my GUESS
also would be around 115mph at 4000rpm....max.

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post #19 of 62 (permalink) Old 07-17-2002, 08:56 PM
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im not saying the drag isnt there, but you cant say that the drag is causing the driveline to slip. its simply causing the engine to work harder. if you can get the engine up to that rpm then you are indeed going that fast, the question is whether you make enough power to overcome that drag.

i guess ill ask you what you think is actually slipping, causing the speed loss.

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post #20 of 62 (permalink) Old 07-17-2002, 08:56 PM
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Oh no look what I started. Well I agree with MagerThom and all the techincal stuff. Thats what I was trying to say. He just made it sound better. haha

Edit:::
I think I have to do a test tomorrow. I will get up to 115 or so and see where my tach is. Maybe i should take a picture too Now, im not saying that J-rob is wrong, he might be correct but it just doesn't sound right to me. Lets all do a test and get back to this tomorrow. ha :p

Last edited by BlackTbird96; 07-17-2002 at 09:09 PM.
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post #21 of 62 (permalink) Old 07-17-2002, 09:13 PM
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sounds like fun!

I'll be doing this also but I know for a fact that at 110 my car is doing 3000 rpm's and my drive terrain is all factory for right know.
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post #22 of 62 (permalink) Old 07-17-2002, 09:21 PM
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Talking This has always been a tough theory...

to teach....How do I explain? At a given power and torque
setting your car will go through thin air faster than
thick air...that's why pilots like to fly at higher altitudes,
less fuel consumption, less drag, more speed. It takes a sharply increasing power curve to move a car through the air
as speed and drag increase. At a given gound speed it takes
less power to move a car through the thinner air at 10,000'
than it does to achieve the same ground speed at sea level as
the vehicle is encountering less drag. Remember, pressure
and\or drag increases very rapidly as speed increases...
yes, if you were to remove the drag/friction/pressure factors from
this scenario then you would come much closer to your theoretical
140mph....but out on the street you can't escape from the
drag pressures created as you start approaching velocities above
say, 70mph.

Hope this helps,

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post #23 of 62 (permalink) Old 07-17-2002, 09:30 PM
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im not arguing the drag, i get that concept, its not hard to grasp. what im arguing is that there is no drivetrain slippage caused by the drag.

picture a bike, your feet are the motor. with your arguement, saying that drag will not only increase the amount of effort to reach a speed, it will also cause driveline parts to slip and decrease final speed, your saying that if i am pedalling at a speed of 60 revolutions per minute and with gearing traveling a final speed of 20 mph, that if i double my pedalling speed to 120 revolutions per minute, i will not be travelling 40 mph. your saying that the drag from the increased speed will somehow cause my driveline to lose speed even if i can maintain the desired pedalling speed.

the drag will make it harder for me to reach the desired 120 revolutions per minute, but if i can still reach that pedalling speed, i will be travelling that final speed of 40 mph.

again, i ask you which part of the driveline is failing or slipping, resulting in the final speed loss?


your arguement is more related to the amount of power needed to reach the desired speed. with the increased drag, you might need exponentially more power to double the speed, but if you can accomplish that, and get to that speed...well... there you are

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Last edited by Robinson; 07-17-2002 at 09:36 PM.
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post #24 of 62 (permalink) Old 07-17-2002, 10:03 PM
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well comming up us41 after going to the track, i was following a 99gt and he said he was at about 138-140 when i was going past him. now i dunno how fast i was going.

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post #25 of 62 (permalink) Old 07-17-2002, 10:11 PM
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Talking With respect to slippage....

or lack thereof your thinking is correct.

My problem is I find it difficult to picture one
of our 'Birds being able to be brought up to 140mph
with approximately what...? 215 rwhp, I don't know the
torque figure, in overdrive at 4000rpm - it sure wasn't
in third. I'm not questioning Blackbird's numbers, but
with the facts as presented - the picture doesn't add up,
at least in my mind. Some test runs by others should
prove to be helpful.

Well, I just saw Vic's post... it's beginig to look as
if my estimate was/is wrong.

Vic - were you driving your '96 'Bird?

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Last edited by MagerThom; 07-17-2002 at 10:16 PM.
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post #26 of 62 (permalink) Old 07-17-2002, 10:18 PM
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well ive pegged my speedo several times, it took quite a while to come down. judging by the engine speed, i calculated i was doing approx. 140. i guess theres no real proof that i was indeed traveling that fast if you can dispute that there was slippage at that speed.

btw, mager, did you get my pm?

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post #27 of 62 (permalink) Old 07-17-2002, 10:36 PM
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major, yea i was in my car, i had it to the floor for quite awhile before i was passing him, i wish i could remember the rpm's but its been a while and i dont remember.

it was kinda funny the look on his face when i passed him.

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post #28 of 62 (permalink) Old 07-17-2002, 10:42 PM
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LOL... I wish you'd Top Gunned him and...

taken a Polaroid as you passed......

Well, I'm beging to realize - I think I'm flat wrong.

I guess our 'Birds are aerodynamically even more efficient
than I thought they were - otherwise I wouldn't be hearing
all these high speeds!

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post #29 of 62 (permalink) Old 07-17-2002, 11:06 PM
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My 2 cents worth.

I've had my car up to a bit over 120 when I first got my chip. That was back with the stock 3.27 gear. Now with the 3.73, I start getting major driveline vibes at around 105-110 so I don' t push it til I can afford a new drive shaft.

On another note, at this past World Ford Challenge 5, I rode with Tony Serno in his 95 SC Auto. Granted, he's got quite a bit done to his car and is making way more power than most 4.6's. We commenced a high-speed run that had us still accellerating at 145. Needless to say we outran EVERYBODY in the group and it took a while for them to all catch up. I can't verify that his speedo is 100% correct, but there were other members in the group in the triple digits and they said we flat out left them.

Anyway, that's my colour for the story.

On the RPM/Speed/Power discussion, once you get past a certain point, it takes nearly double the power or more just to gain a single MPH or two. Ask the guys who run Bonneville. It has nothing to do with the RPM you're running, but whether you have the power to get to the RPM you desire with your gearing.

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post #30 of 62 (permalink) Old 07-17-2002, 11:35 PM
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I can't wait till I get a custom chip, I top off the speed at least 4 or 5 times a week (that's 105mph or somtin),

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