I don't know but I can't wait to get pulled over while I am trying to find out. Hoping the the cop will start with "Sir, do you know how fast you where going?" So I can say, "why no sir I don't the speedo stops at 85 but the needle was WAAAAAAAAAAAAAAAY below that so I must've been goin' at least a hunnie."
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85 GT 4 SPD Number 53715 of 76371 Best 1/4 15.816 @ 84.72
Accel 8.8mm wires, Accel 300+ Ignition box, Blaster Coil, NGK UR5, K&N, Short Shifter, High flow cat, Monochrome Caracus red, KYB shocks/struts, ST lowering springs, Poly Dogbone.
Coulee Region Fieros member(couleefiero.tripod.com)
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10:38 PM
88fieroformula Member
Posts: 662 From: Bakersfield, Ca, United States Registered: Aug 2003
In stock condition 123.77mph is the absolute top speed. That was timed by the SCTA back in 1994 in my first 1988 Formula 5-speed. Dry lake bed, no wind, relative cool temps, maxed air pressure in tires, full tune-up, I weighed 165 at the time (ah, the good old days!)
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12:52 AM
Oreif Member
Posts: 16460 From: Schaumburg, IL Registered: Jan 2000
My first 1986 SE V-6/4-spd with aftermarket wheels/tires (stock sizes) went 126mph as measured by VASCAR of the Wisconsin State Police. (No ticket was issued, Cousin is a state police officer up there. )
My recent 1986 SE when I had the 2.8L with a TH125 trans (3.08 final drive) maxed out about 115mph.
I think the highest recorded by a magazine review was 124mph.
[This message has been edited by Oreif (edited 01-05-2005).]
depends - mostly on transmission & tire size. generally - in stock form - roughly 125. with some intake porting, probably get out to 135. in high gear, the tach really creeps from 4500 & up.
just for fun - my 85 mph speedo - when it wraps around, back to 0 - the needle starts to spin around - dont try this at home
------------------ www.yellowfiero.com/fiero.html 17" DEZENT T wheels with 215/40 tires front and 235/45 rear, KONI shocks, EIBACH lowering springs, PU dog bone, bushings and engine mounts, K&N air and oil filters, OZELOT exhaust, Mercedes SLK yellow, Mr. Mikes seats, door skins, shift and e-brake boots. MP3 player and custom subwoofer behind passenger seat, F355 style front. Fiero Store rear swaybar, strut tower brace, black carpet. Rodney Dickman's competition short shifter. Billet aluminum dash kit from Kitcarman.
[This message has been edited by yellowstone (edited 01-05-2005).]
Whatever, we don't do miles anyways over here (we've got the metric system, you know, "Royale with Cheese"). Problem is that the kilometers per hour are so hard to see at that speed :-)
quote
Originally posted by Toddster:
I think you mean about 125. Cool video though.
[This message has been edited by yellowstone (edited 01-05-2005).]
i have had my stock 2.8 at about 135... a bit scary at that speed with no suspension mods... the first time i ever got my car past 110 the headlights popped up and i fixed that with the hood popped. the 135 was clocked with a older style radar gun that was farly acurate and a abandoned road no wind and i still had about 700 rpm to go before redline. note this was a isuzu 5 speed and stock 14 inch tires that got me their. im looking to get much faster with a higher rpm more power motor in the spring and some body mods for aerodynamics and suspension mods for safety and handling.
Oh God please don't tell me we have to go through the physics again...PLEASE! We only have about 200 threads on this subject. The top speed is between 123 and 125 depending on atmospheric and other minor conditions.
Oh God please don't tell me we have to go through the physics again...PLEASE! We only have about 200 threads on this subject. The top speed is between 123 and 125 depending on atmospheric and other minor conditions.
He had an Isuzu 5-spd. If it had the 2.78 final drive He could theortically get to 151mph based on 6000rpm, .78 5th gear, and using 215/60R14 tires. So 135 isn't far fetched. Actually enter in the CD of about .34 and the car should be able to go 137.662mph. With the lower gearing you will have a higher top end but take longer to get there.
A totally "stock" Fiero GT with the V-6 and Getrag calculates to 138.854 add in a CD of .34 and you get 127.213mph.
(note: this is at sea level.)
[This message has been edited by Oreif (edited 01-05-2005).]
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07:07 PM
Weponhead Member
Posts: 1264 From: Keymar MD USA Registered: Nov 2003
Well The other night with fieroman 87 in PA we were runnin hard and he said we were goin 120 "i have the 85 mph speedo for now" we both have slightly modified v6's he has a getrag and i have the th125, i couldve gone to MAYBE 125 before i ran out but thatd be with the car screaming like a banshee lol i was at about 5000 rpms and it didnt take long to get there, he said he was at about 4000 rpms... so yea.
Well mine is a remanufactured 3.1 with 5 speed getrag....tires all all the same size (I forget exactly) but 15"
I weight about 250lbs, probably had about another 100lbs of luggage and general crap in the car, and I held 120mph for some pretty good stretches of road in Nevada/Utah
I tried pics and even a short video, but for some reason its blurry.....guess I need a passenger to hold the camera.
------------------ 87 Fiero GT Remanufactured 3.1 w/ 11k miles on it now. 5 speed getrag with about 74k on it.
Well its not like the car was shaking or anything, and I was obviously holding the steering wheel with 1 hand and the camera in the other because it was a straight empty freeway and the car was running very smoothly. It certainly wasnt white knuckle holding on for your life. It felt just as comfortable as doing 70mph. I figure the car is doing 120, but so is the camera kinda.
Camera is 5MP Sony CD500 and can take about 30seconds of video.
Can someone tell me a place I can upload this video?
------------------ 87 Fiero GT Remanufactured 3.1 w/ 11k miles on it now. 5 speed getrag with about 74k on it.
[This message has been edited by Gecko (edited 01-05-2005).]
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11:55 PM
Jan 6th, 2005
Toddster Member
Posts: 20871 From: Roswell, Georgia Registered: May 2001
He had an Isuzu 5-spd. If it had the 2.78 final drive He could theortically get to 151mph based on 6000rpm, .78 5th gear, and using 215/60R14 tires. So 135 isn't far fetched. Actually enter in the CD of about .34 and the car should be able to go 137.662mph. With the lower gearing you will have a higher top end but take longer to get there.
A totally "stock" Fiero GT with the V-6 and Getrag calculates to 138.854 add in a CD of .34 and you get 127.213mph.
(note: this is at sea level.)
Yeah, but now you are talking about modification. The V-6 came "stock" with the Getrag. I have no personal experience with matching Isuzu trannies to 2.8 engines so I am unqualyfied to comment. I have stated that I would believe 127MPH under totally ideal conditions...like laboratory! But that's it. In the real world the horsepower of the engine can only push through a final drive gear so hard. I can't comment from experience but I find it hard to believe that a stock 2.8 engine can reach 6000RPM in the final gear of an Isuzu tranny. I'm guessing it would top out around 4500. I know the Getrag tops out around 4300 in 5th.
at 4500 the speed would be approximately: ((4500x60)/2.60)/806.72 = 128.73 mph top speed
Yeah, I can see it. Might just try it some day for the hell of it.
NOTE: 806.72 assumes new fully inflated 1988 GT tires, 215/60/R15.
[This message has been edited by Toddster (edited 01-06-2005).]
Yeah, but now you are talking about modification. The V-6 came "stock" with the Getrag. I have no personal experience with matching Isuzu trannies to 2.8 engines so I am unqualyfied to comment. I have stated that I would believe 127MPH under totally ideal conditions...like laboratory! But that's it. In the real world the horsepower of the engine can only push through a final drive gear so hard. I can't comment from experience but I find it hard to believe that a stock 2.8 engine can reach 6000RPM in the final gear of an Isuzu tranny. I'm guessing it would top out around 4500. I know the Getrag tops out around 4300 in 5th.
at 4500 the speed would be approximately: ((4500x60)/2.60)/806.72 = 128.73 mph top speed
Yeah, I can see it. Might just try it some day for the hell of it.
NOTE: 806.72 assumes new fully inflated 1988 GT tires, 215/60/R15.
the GT fastback came with the getrag and larger diameter wheels and a worse drag coeficient
the v6 aero notchbacks came with 4speeds, smaller wheels and lower drag
how about with a 3mph tailwind and a .05 degree downhill decline in the road.. its possible stock because conditions aren't laboratory ideal and variables are presant
[This message has been edited by Kohburn (edited 01-06-2005).]
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01:43 PM
Oreif Member
Posts: 16460 From: Schaumburg, IL Registered: Jan 2000
In the real world the horsepower of the engine can only push through a final drive gear so hard.
No, vamper68 mentioned the trans mod, But simply stated the 2.8L was stock. You just assumed when he posted the statement " a stock 2.8L" that it meant the entire car was stock. I just pointed out the "car" was not.
Yes the horsepower of the engine can only push the final drive so hard, But then again, Due to the mass production of the engines, The actual true horsepower and torque of an engine can vary as much as 10%. Not to mention altitude/elevation has a huge difference in performance as well. These 2 variables alone can account for up to a 10mph difference. If someone posts a top speed that is higher than what your car did, That is no reason to give a condescending reply their claim like: "Oh God please don't tell me we have to go through the physics again...PLEASE!".
road surface tire size, tire pressure, type of rubber all affect rolling friction air temp, altitude, humidity, engine wear all affect HP gearing will affect your HP at MPH wind, tire width, and body style affect drag incline/decline affect resistance to acceleration
unless a car is electronicly limited to less than its potential the actua results wil vary a lot
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02:51 PM
Pyrthian Member
Posts: 29569 From: Detroit, MI Registered: Jul 2002
In stock condition 123.77mph is the absolute top speed. That was timed by the SCTA back in 1994 in my first 1988 Formula 5-speed. Dry lake bed, no wind, relative cool temps, maxed air pressure in tires, full tune-up, I weighed 165 at the time (ah, the good old days!)
there ya go - actual real live results. you cant get better than that. every car is gonna be different - trannys, condition of the engine, tire size, wind, temperature - on & on & on. speedos are not very accurate, especially at higher speeds. but, it seems everyone agrees, basicly stock - 120 to 130 mph is it.
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03:08 PM
Toddster Member
Posts: 20871 From: Roswell, Georgia Registered: May 2001
That is no reason to give a condescending reply their claim like: "Oh God please don't tell me we have to go through the physics again...PLEASE!".
When someone claims 135 mph with a stock 2.8 enigne, regardless of the tranny....it does.
But you're entitled to your "opinion". Thank you for sharing it.
But I am more interested in facts. Show me the sanctioned time slip and I'll be happy to eat my words. Until then, in the interest of reality, I will continue to correct people who CLAIM to have done 135 MPH in their stock fieros.
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07:14 PM
PFF
System Bot
TaurusThug Member
Posts: 4271 From: Simpsonville, SC Registered: Aug 2003
So now your "official opinion" is 140hp/170 ft/lbs of torque on a V-6 can't go 135mph irregardless of the trans gearing?
Your welcome and thanks for sharing your "factual opinion" as well.
No, my official opinion is that the STOCK FIERO 135bhp/170ft/lbs torque V-6 (exclusive of all other V-6 engine that I have never tested) can't go 135 regardless ("irregardless" is not a word) of the trans gearing in a stock weight Fiero with stock tires.
Anyone claiming to have gone 135 in a stock fiero (getrag or isuzu) either has a bad tach and/or filter, bad speedo, bad VSS, bad ECM, or is just embellishing. Show me the times slips and I'll retract. It's not attitude Orief, it's just facts. Read what ever you like into my posts but you can't argue the fact that the Fiero can't go 135 in anything even remotely resembling stock trim.
The original Pace car topped out at 144 MPH. that's just 20 MPH faster than my fastest stock Fiero time and it took and engine with nearly 100 more horsepower, better areodynamics, and low resistance rims to get those extra 20 MPH. you're suggesting that by just swapping a tranny you might be able to gain 11 MPH!!! I say, no way. 2 MPH? Sure, I'll buy that. Not much more however.
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10:05 PM
Oreif Member
Posts: 16460 From: Schaumburg, IL Registered: Jan 2000
No, my official opinion is that the STOCK FIERO 135bhp/170ft/lbs torque V-6 (exclusive of all other V-6 engine that I have never tested) can't go 135 regardless ("irregardless" is not a word) of the trans gearing in a stock weight Fiero with stock tires.
Anyone claiming to have gone 135 in a stock fiero (getrag or isuzu) either has a bad tach and/or filter, bad speedo, bad VSS, bad ECM, or is just embellishing. Show me the times slips and I'll retract. It's not attitude Orief, it's just facts. Read what ever you like into my posts but you can't argue the fact that the Fiero can't go 135 in anything even remotely resembling stock trim.
The original Pace car topped out at 144 MPH. that's just 20 MPH faster than my fastest stock Fiero time and it took and engine with nearly 100 more horsepower, better areodynamics, and low resistance rims to get those extra 20 MPH. you're suggesting that by just swapping a tranny you might be able to gain 11 MPH!!! I say, no way. 2 MPH? Sure, I'll buy that. Not much more however.
The fact is your Formula went 123.77mph with a V-6 and a getrag 5-spd. The differential ratio is 3.61. That calculates out to engine rpm of 4650rpm's in 5th gear assuming stock sized tires. The Isuzu has a 2.78 ratio, reduce the rpm's to 4000 and everything else the same and the speed is 138.07mph.
Lowering the differentials ratio increases top end mph a lot more than 2mph. It works out to be for every 0.02 ratio change is 1mph change in top end. You can verify it yourself: http://www.juric.org/mopar/tools/topspeed.php
As for the Pace car, You'd better look at the Pontiac Performance Plus article on how they built the car and see it's real "facts". They used the 4-spd manual which has a 4th gear ratio of 1.0 not the 0.78 of the 5-spd's fifth gear. The differential ratio was 3.65 (which they kept for the V-6 4-spd transmissions.) not the lower 2.78 of the Isuzu. With the higher power (and RPM, the SD4 revs to 7000rpm) this was how they accomplished 144mph with the higher diff ratio. The only change aerodynamically was lowering the car 1.0" otherwise it was a STOCK aero-notchback body.
Also a "fact" that ALL Fiero engines were 140hp/170ft/lbs of torque. The 135hp/165ft/lbs rating was only for 1987 and 1988 for EPA purposes. If you look at the rating spec the 1987/1988 was rated at 200rpm LESS than the earlier engines.
[This message has been edited by Oreif (edited 01-06-2005).]
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11:09 PM
tednelson83 Member
Posts: 1993 From: Santa Clarita, California, USA Registered: Jul 2002
i got my 87 GT auto up to some where around 130 one time. and i still had 500 rpm left before red. the engine has 60k, final drive 3.33, k&n air filter and no cat. other than that bone stock. it started to get really light, and i started to run out of road on that desert street, so i slowed down at that point. i estimate the top speed to be 135, but no faster.
ok let me clear some of this up... i bought my car almost 2 years ago. i had to change the transmission which was originaly a 4speed but the previous owner replaced it with a isuzu 5 speed that tranny cracked on him shortly after he replaced it. so i bought the car and replaced the trany with another isuzu 5 speed out of my failed 4cyl car.I couldnt tell you much more about the car except the cat was taken out before i owned it ( this is stock where i live lol). i replaced some brakes and cleaned up as much as i could after the tranny was installed (previous owner had a new clutch put in it). fixed my egr valve and exhaust leak and a few other things and have enjoyed the car for the past 8months. the odometer says 138,xxx but if you were to look at the top end of the motor and also the fact that she doent leak or consume oil at all and still pulls very strong i would say that she was recently rebuilt... within 15-25k. so a fairly low mileage motor with no cat... and maybe just maybe something more done to it besides a rebuild(oversized or a cam) one way or the other i know my car pulled 135 or atleast very very close to that speed + - 1mph say what you will and what you want... we will all see when i get my 3.4tdc and some other stuff this year.
I wish this engine ! Drives 120 mph with open door , no fuel , engine cold and only 1800rmp . Where I can find this racing engine ! I`m very surprised if I reach 200km/h and everything runs quite and my brakes are under control . Please tell me what I do wrong , because now I work 14 years on the Fiero and that is the point where I reach my limit .
quote
Originally posted by FIEROPHREK:
here's the fastest i've had mine.
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06:59 AM
crzyone Member
Posts: 3571 From: Alberta, Canada Registered: Dec 2000
Vamper... In another thread you said your 2.8 with alittle bit of top end work was pulling 200hp and your top speed has gone down from 150mph to 135....
I don't buy it. -------------------------------------------------------------------------------------------------------------------------------------------- When I had the stock 2.8 I went around 125mph with a 4 speed muncie. I was around 5300rpm. I may have had a few hundred rpm left but I felt the motor didn't like being wound so high under a big load.
I havn't tried a speed run with my 3.4dohc, but I imagine it should hit 150mph.
)
96k Miles, 2nd owner
