Whats the fastest (top speed) that you have ever heard of a modified fiero reaching? This is my first post and thought that this would be an interesting discussion. I guess aerodynamic stability would be the main issue. It seems that the aerodynamics of the fiero are quite good, except for the rear glass drop off, which is not exactly an optimal angle for aerodynamics.

125 ruffly the speedo only goes to 120. but it was pinned. my fiero is stock i have a long straight away with no cars from vegas to reno it handles better at 120+ then at 80.

Scott

First of all let me Welcome you to the Forum . Not a bad first thread , like V-8 Archie says " How fast do you want to go " .
Horse Power always equates to money , there is no getty arourd it .

Have had my 85 Sport coupe up to 118 mph . it's a 4-Banger , was running along side of my buddys Corvette , just to see what the little engine that could would do ! I rebuilt the engine . Had to lift off the throttle , strong side winds . The car started to dance a bit . Plus I had no lower front air dam , ( my wife wiped it out on a curb ) . The front end started to lift , I felt as if I was driveing on ice .

Hope this helps .

Galen Smith
Red 85 Sport Coupe
Founder of Suncoast Fiero Club
Florida fiero Council

I had my 3.4 L with a t440 auto up to 140+ in 3rd gear on a dyno machine. Does that count?

My first 86 SE (modded) reached 138mph (calculated because the speedo stopped at 85mph, I used time Vs. Distance on the highway)

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Happiness isn't around the corner...
Happiness IS the corner.

I don't think 140 on a dyno counts, simply because at that speed aerodynamics do make a difference. Horsepower has alot to do with topspeed, but so does gearing, rolling resistance, and drag.

the fastest i've heard of was something like 160-170mph. 406 smallblock zumalt conversion. that was in the hotrod magazine that had the pro street fiero. i think around mar. '86.

remember this is "heard of". it was stated in the magazine and i'm just repeating it as a responce to the thread (it's a shame you have to add a disclaimer for almost anying you post these days).

Fastest I've gone in a Fiero was a passenger of a local MN forum member. It was in a 350 v8 getrag 5-speed Fastback GT and we hit 150-155 MPH after doing the calculation of tire size, gearing ratio, and RPM.

The car felt stable and this was with the stock rims! The front was lowered with Suspension Techniques springs maybe that helped in some the stability factor.

165mph along side of a Viper GTS and still had some rpm available!

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Click to Listen!

depends on the engine.

the fastest 4-banger is this one:

It posted a speed of 147.68 mph on 8-17-98 at the Bonneville Salt Flats as measured by the Southern California Timing Association.

I don't have any numbers on 6 or 8 cylinder Fieros.

quote Originally posted by Toddster: depends on the engine. the fastest 4-banger is this one: It posted a speed of 147.68 mph on 8-17-98 at the Bonneville Salt Flats as measured by the Southern California Timing Association. I don't have any numbers on 6 or 8 cylinder Fieros.

is that scale MPH or actual?