I was wondering, what's the highest confirmed speed you guys have ever heard of from a Fiero? I'm assuming the V8s are going to have the highest top end.

quote Originally posted by maxsideburn: I was wondering, what's the highest confirmed speed you guys have ever heard of from a Fiero? I'm assuming the V8s are going to have the highest top end.

I think CAKID ran next to a Viper and the speed was up there. Look at the top speed.

Other than that, since you used the words "V8 top speed"
this thread might get ugly .....

[This message has been edited by madcurl (edited 09-22-2005).]

thats up to the transmission used & the RPM the V8 can power to.
I would assume a DOHC motor, being capable of higher revs, would have a higher top speed.

but, if you listen to Fiero myths
Fiero's flip over at 120, so 120 is it

According to a chart i used a while back with the 3.61 5 speed and a redline at 7000RPM's it should top out a little above 130? But i hear of people going much faster, how is this? Obviously bigger tires help too but not THAT much.

With 215 60/ 15s the getrag runs approximately 3000rpm at 90mph, and ~4000rpm at 120mph, so at 7000rpm it would be doing around 210mph!!! Ofcourse it would take some serious power to get to that speed.

quote Originally posted by 865spd: According to a chart i used a while back with the 3.61 5 speed and a redline at 7000RPM's it should top out a little above 130? But i hear of people going much faster, how is this? Obviously bigger tires help too but not THAT much.

I got that with a 4speed 3.65 gearing with stock tires, custom exhaust...130mph at about 4.5k rpms.

Basically like stated before it all depends on the gearing and the redline. The higher the redline the longer the gears. So i guess the major factor is redline. Most do the v8 for it's torque and others do smaller swaps for the revs.

[This message has been edited by goatnipples2002 (edited 09-22-2005).]

no proof beyond the article, but the hot rod mag that has the black and yellow superduty fiero (an '86 issue i think) also has an article on a zumalt v8 fiero. he claimed pulling a porche at 170 in it.

quote Originally posted by goatnipples2002: Most do the v8 for it's torque and others do smaller swaps for the revs.

Speak for yourself...

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Ryan - "If you try to follow me, you'd better learn to fly"

Owner of the *only* paddle-shifted, Northstar powered fiero.

quote Originally posted by 865spd: According to a chart i used a while back with the 3.61 5 speed and a redline at 7000RPM's it should top out a little above 130? But i hear of people going much faster, how is this? Obviously bigger tires help too but not THAT much.

You need to factor in the revs per mile of the tire size and also the 5th gear ratio. With your numbers above and using the stock GT tire size it comes out to 186.37mph. (Assuming the engine has the power to hit 7000 rpm in 5th gear.) Changing tire sizes affects top speed but only by a few MPH.

Here is a top speed calculator:
http://mywebpages.comcast.net/rforceno/tsc/tsc.htm

For tire sizes here is a tire size calculator:
http://www.miata.net/garage/tirecalcold.html

I used these numbers:
Tire diameter: 25.2 (Stock GT rear tire of 215/60R15)
Rear end ratio: 3.61
Final Drive: .78 (Getrag's 5th gear)
RPM: 7000

My 1986 SE with a ZZ4 V-8, Stock V-6 4-spd (3.65) and 215/50R16 tires should hit 138.8 mph. I haven't wound it up that high but I have had it over 120mph and still have power/pedal to go.

Yes gearing and engine RPM determine top speed as well as aerodynamics/drag of the cars body, But the engine has to have the power to push those RPM's in the final gear as well. A 100hp 4-cyl is not going to get to it's 6000rpm redline in the final drive. You might be able to hit about 4500rpm on a good day. So it'll top out around 115-118mph. But if you had a 200hp 4-cyl that could reach close to redline, You would be around 150mph.

quote Originally posted by Philphine: no proof beyond the article, but the hot rod mag that has the black and yellow superduty fiero (an '86 issue i think) also has an article on a zumalt v8 fiero. he claimed pulling a porche at 170 in it.

I would believe that (given he had enough horse/torque/rpm), from personal experience with my car it certainly appears that the horse/torque are not my limitations for speed. In other words it will pull hard till the engine noses over hard in the rpm range. I did a calculation for achievable TOP SPEED on mine to the rpm that my engine falls off at (when TPI's fall off, horse/torque drop rapidly), and mine should max out at approx 181 mph before horse/torque rapidly drop off.

[This message has been edited by California Kid (edited 09-22-2005).]

My v8 will only go 85 MPH for some reason.

quote Originally posted by Cooter: My v8 will only go 85 MPH for some reason.

Change the speedo.

quote Originally posted by Formula88: Change the speedo.

I'm afraid to go any faster

Tire Diameter: 25.2
Max Engine Speed: 6500
Rear Axle Ratio: 3.71
Trans Final: .68
Vehicle Top Speed: 193.16

Ohhh yeah. I could probably get there too, if it weren't for me going airborn at 150..... Don't know if 240whp is capable of reaching that though.

http://www.car-videos.com/tools/speedrpm.asp?Car=Select&Num1=215&Num2=60&Num3=15&AxleRatio=3.61&Ratio1=3.50&Ratio2=2.05&Ratio3=1.38&Ratio4=.94&Ratio5=.72&Ratio6=&Ratio7=&Redline=60 00&Increment=500&B1=Recalculate

According to this it should top out at 166 at 6000RPM's with the Getrag.

Just go here, it is in excel format, but has all the Fiero trannys and you can adjust the redline

http://www.captfiero.com/fierotransmission.xls

it also has the specs for the new G6 6spd.

For the record I have had my 85GT to aprx 145mph estimated using 225/60/16's and a 4spd stick and the tach at around 5000 if I remember correctly. I would never try this without at the very least a hood vent and lowering springs with near perfect suspension and allignment.

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85GT 5spd MSD Everything,4.9 With Nitrous. www.captfiero.com

[This message has been edited by Capt Fiero (edited 09-22-2005).]

quote Originally posted by maxsideburn: I was wondering, what's the highest confirmed speed you guys have ever heard of from a Fiero? I'm assuming the V8s are going to have the highest top end.

Should caluations be made with or without tail/head winds?

quote Originally posted by Capt Fiero: I would never try this without at the very least a hood vent and lowering springs with near perfect suspension and allignment.

Z rated tires are a must, unless you have some kind of death wish.

simply put what I was asking was, what's the highest confirmed speed a Fiero has ever reached that you guys know about?

207.55 MPH! Seriously!

https://www.fiero.nl/forum/Archives/Archive-000002/HTML/20040223-1-034963.html

Rrunner had his V-8 IMSA up over 200 MPH if I remember correctly !

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HARDCORE SBC FAN AND PROUD OF IT ! GOT TQ ?

quote Originally posted by FIEROPHREK: Rrunner had his V-8 IMSA up over 200 MPH if I remember correctly !

see link posted above... he believes he could - but hasn't (at least as of that posting)

[This message has been edited by MinnGreenGT (edited 09-23-2005).]

holy bob saget that is one fast fiero.... it would have flipped over almost 3 times (following the 88mph rule )

and whats up with this headlight door thing I keep hearing about? I have taken my car well past the 85mph the speedo stops at and have never had this happen to me, and yes they are stock doors with no locks

[This message has been edited by MDFierolvr (edited 09-23-2005).]

There are a myriad reasons why different headlight doors pop at different speeds. Weak springs in the headlight doors, removed air ducting and under car spoilers.

I have had cars that it took 120mph for the headlights to pop up and others that would pop up at a nice 90mph cruising speed on the back canyon highway.

However with hood vents it takes substantially more speed to get the headlights to pop up if at all. With the sunbird hood vents it takes about 140mph to get them to pop in my car. Without the vents they would pop at 110mph. Granted this is with 2 different hoods. (I cut vents into my hood, I simply changed hoods)

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85GT 5spd MSD Everything,4.9 With Nitrous. www.captfiero.com

mine used to pop up at about 115-120

quote Originally posted by goatnipples2002: I got that with a 4speed 3.65 gearing with stock tires, custom exhaust...130mph at about 4.5k rpms. Basically like stated before it all depends on the gearing and the redline. The higher the redline the longer the gears. So i guess the major factor is redline. Most do the v8 for it's torque and others do smaller swaps for the revs.

Forgot to add the most important mod...my extractor scoop...serioly these things are underrated by those that don't know their true potential.

quote Originally posted by California Kid:

Cannonball run, right??

Well, for reference, a Lamborghini Gallardo has a measured top speed of 191 and the murcielago has an estimated top speed of 205; both drag limited. Chevy is claiming a top speed in excess of 190 for the new 500 hp LS7 Corvette. So, until I see a fiero with over 500 hp and some pretty slick body mods (including possibly laying back the windshield) I'm not believing anywhere near 200. I'd be curious to know how fast Curley's V8 car would go "pedal to the metal" 'til redline, 'cause his is definitely the slickest Fiero I've ever seen .

But definitely a good question, Max ....

[This message has been edited by PaulJK (edited 09-24-2005).]

I only have an 85MPH in my V8 car. So what is 20MPH when it goes past 85!!!!!

I just wish I could find these more often.

Myself, ... top speed unknown. Hit 130 a few times in the 1/4, but then that was 4th gear and I was running out of road.
It be difficult to find a road to test this on.
Hitting a bump in the road at 80 is tolerable, quick lane change at 90 no problem, heavy side winds at 100 would get your attention ...
Considering you would want to take your time taking the car up to max speed.
I know, I know. The Autobahn, right? Well the have their idiots there too. They just speak a different language.
IMO You would need a closed road, and a good one at that.

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[This message has been edited by Tina (edited 09-24-2005).]

Good Points Tina!

In addition, in most States, speeds over 120 mph will certainly result in one of two things if you get caught.

A. The Police will jump all over you and not issue a ticket because they'll state "You won't live long enough to pay the fine". Happened to a friend of mine here in Michigan.

B. They'll have your car towed/impounded, and take you immediately to jail.

Ive had My 3.4DOHC to 147~148. Felt pretty solid. I quit because I had no idea I was going that fast, and it shocked me when I realized there wasa peg on the speedo I noted the RPM and slowed down quickly to do the math.

When you think about it, if you blow by a cop at 130MPH, unless you slow down, you're never going to see him again, and theres no way he can get your plate going that fast. Ive passed em going 70 in a 55 and managed to get away before the lights came on. I saw him follow me around a couple of turns, but that was only as I was taking the next turn. I lost him after the third. As far as im concerned, until the flashing lights come on, Im still just driving fast, not evading. Best one was, I was only going like 62 in the middle of the country, but I saw a stately start to turn on me, so while he was nosed into a driveway, I zipped off the road and hid behind a barn DDUKES OF HAZARD BABY!!! Once I saw him fly by I waited a few seconds, then backed out, floored it the oposite direction and took the first turn I came too lol

Cali-kid - Florida won't. At least not a few years ago. I was clocked at 110 in a 55 outside Miami and I was given a ticket and sent on my way.....I was truely surprised by that.....just as surprised as they were that I wasn't drunk or carrying contraband...lo.l

It happened to me and the 120 was pegged out. The nice CHP finally caught up and told me to slow down, no ticket, and that I had a very nice car. Since I have digital gauges now... I've keep the speed down, hehe.

FWIW, at 120 the 84 front end feels like i am NOT in control. so i rarely go faster than 100.

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_{Buddy Craigg - there are two "G"s in my last name
Ling = 84SE-Modified
Julia C = 85GT stock (kinda)
Ivy = 67 Pontiac Catalina
KCFOG}

Base coupe front ends generate lift at speed - exceed 100 MPH with extreme caution if you're driving one of these...

All Fiero Bodies generate lift at speed. It is mainly due to the cooling design. The front is designed to pull air up from under the car and bring it through the rad. Just poor design (or not designed) for ultra high speed driving. A stock bodied Fiero weather it be an 84 coupe with a motor transplant or an 88GT pushing 120mph can be scary to say the least. Hood vents, lowering running 50 series rubber at least, and good alignment make this cars much better for long period's at speed. I made a run from Seattle Washington to Cour-d-Alene Idaho at 2am, there were periods that I thought I had fallen off the face of the planet just barren open road. I took my 85GT and ran it between 110-120mph sustained for a very long time with no ill effects because that is what I had built my car to do. (3.32 transaxle kept the revs very low 100mph was only 2600 or so rpms.)

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85GT 5spd MSD Everything,4.9 With Nitrous. www.captfiero.com