Does anyone know the top speed of a stock 4 cylinder engine in a fiero? A 6 cylinder?

Thanks.

I think the top speed for a V6 Fiero is 135. I have had mine to about 125 or so.

I had a 4 cylinder in my Fiero and I got it going 80 going downhill away from the rotation of the earth, strong tail wind and 60 psi in the tires . OK maybe it's not that bad.

I had my V6 to 115-120

I've had mine up to 90mph once. I was driving with very fast traffic on I-70 in the center lane and my exit for 675 was coming up. I don't drive very fast around here, always cars around. I know scca does his racing bit though.

My '84 SC auto topped out around 100, I estimate (85mph speedo is a ***** ...) I had my '87 GT cruising down the road at 100-110 for a few miles, and that sucker had PLENTY of go left at that speed. I never tried a top speed run.

I've only got 85mph on my 84se...
but I KNOW, it goes a little faster than that..

I HATE it when the headlight covers pop up around 125MPH! Need to do that mod.

I have had my 4 cyl up to 100 for a few miles. It started to get a little high on the temp gauge so I backed off.

No matter how hard I try I can't get my new 2.8L with ported intake and exhaust above 85mph.

Oh wait, that's all my speedo goes up to.

The top speed of the V6 has been quoted by a number of magazines as the lowest 118 (Motor Trend) to 128 mph (Auto Week). The 4 cyl topped out at 105.

I found out, after I got my hooker tri-Y headers and took off the cat on my 87 4 cyl, that if you go fast enough and the speedo needle hits 0 again - it goes beserk! (Vegas trip when I was young and immortal)

Source: Fiero by Gary Witzenburg.

[This message has been edited by WKDFIRO (edited 01-25-2000).]

Whats the top speed at 6000 RPM??

When a car reaches redline, magazines usually count the speed at redline its top speed, but I suppose if you push the engine to 7000 RPM you might get 140-145 outta it!!, haha I should try it

Dang, I thought that my 84 SE would go past 85 MPH? Weird. On the way home from when we bought it we were doing like 75 easy. i mean, most cars go 75 easy. So 4 cyl's only go around 105 mph, we could of passed one up in our '89 Trans Am 305 easily. We were crusing at 105 mph across a bridge, it was fun!

Here are some interesting figures. If you have the M17 Getrag 4-speed with the 3.65 final drive and your engine could pull 5500 RPM in 4th gear, these would be your results:
1000 RPM....24.31 MPH
1500 RPM....36.46 MPH
2000 RPM....48.62 MPH
2500 RPM....60.77 MPH
3000 RPM....72.93 MPH
3500 RPM....85.08 MPH
4000 RPM....97.23 MPH
4500 RPM....109.39 MPH
5000 RPM....121.54 MPH
5500 RPM....133.70 MPH
What will you get at 6000 RPM???? 145.86 MPH. A 5-speed (3.61) would of course be a little higher. How do you keep it on the ground at that speed tho???

[This message has been edited by cobra427 (edited 01-26-2000).]

hehehehehe anyone ever done 40-50 km per hour in 3rd man i love that sound when the exhaust rumbles especially down town with buildings on both sides
can you tell i dont drive fast that much

Most of the car magazines that I have read seem to beleive that since it isn't their car they usually go until it won't go no more (top gear is usually an overdrive that won't get to redline) or it hits the rev limiter. I don't think the red line stops most of these guys...

I know that my 5 speed 4 cyl would not go past 4700 rpm in 5th gear no matter how I had the pedal down to the floor.

I couldn't do that to my V6. I built that engine, it would kill me to blow up almost a years worth of work on the engine alone.

[This message has been edited by WKDFIRO (edited 01-26-2000).]

I've had my 4 cyl. 5 sp. up to just around 95 (speedo was pointing straight down, but confirmed) while racing against my sister and still had about half the pedel left to go. Would have tried faster, but she had a hard time keeping up with me there. Love to see how fast I can really take it sometime.

Top speed of my 84 Coupe was 103. Top speed of my 88 Coupe is 108.

I never got to find out how fast my 86 SE 4-sp would go, but Road and Track claimed an 85 GT 4-sp would go 125.

When I had a stock 2.8, I got it to 130mph, but I think 87s and 88s pull 5 more hp than other models. Could be wrong..Maybe only the 88s....

i believe the 88s had 5 less.

I don't ever go over 80 anyway.

don't want to hurt my toy

On the Highway next to my friend Driving the Alfa 164L, @ 6000rpm in 4th at 143mph (Alfa Speedo reading) On the Dynojet at the shop not wind resistance or rolling resistant 156mph @ 6000rpm. 86 SE V6 4spd.

2m6,

Was that before all modifications?

All others,

Wind resistance is the killer, not RPM. I opened my big mouth on a thread about this a couple of months ago ... blah, blah, calculate, blah, blah, easy, blah, blah. let me know... you get the picture. I still haven't gotten around to doing the calculations yet. I can tell you from memory that wind resistance is a killer. The equation uses velocity^2. Assuming that there isn't any wind you could go 10-15 mph faster than when there isn't. I will try to revisit my calculations. Perhaps we can chug through these together .If I remember correctly there are about 30-40 separate calculations involved before you get an accurate # back out. Then again, you could just produce a quick estimate in a few seconds too. Anyone interested?

William T. Thorn, III

How about a 4 cyl. or 6 cyl. with an automatic? Is there that much of a difference? Thanks.

You could always blast through a radar trap flat out and I'm sure that you would get verified certification of your top speed.

Will, That is with a stock 2.5 and 5 sp. I've done nothing to the car since I purchased it in april of last year aside from a new clutch and cylinder head. As I recall, I was at about 3000 RPM when my speedo was pointing straight down. Again I only have my sisters verification for the 95 MPH reading. I have however been wanting to pick up a 120 MPH speedo to verify this info, and a nice long street to see what this 2.5 is capable of.

I got my 87GT stock except for flowmasters past the 120 mark on the spedo. I figured it out to be around 130-132. Good for a 2.8 almost stock!

I agree with Will. Top speed is the point where you're car doesn't have enough power to overcome the wind resistance. I'm sure if you cleaned your car up good, took off anything that cause turbulance you could eke out a few more mph's..

Phil, I inadvertantly did that but I found out a funny thing...

When you suck the doors off a CHP on the freeway doing around 110 (I hadn't done my 120 speedo mod yet)radar can't lock on you fast enough. I had gotten out of the gas by the time he caught up with me. I am so surprised that I wasn't kissing my hood with my hands behind my back. The cop said that his radar couldn't lock on fast enough but he did have to go to 105 just to start to catch up...he asked me how fast I was going. I looked down at my speedo and looked back up at him and squeaked "80?" I know if I had said, "I don't know" than he would have given me whatever number he wanted. He put 80++ on my ticket and told me that he would be there if I fought the ticket.

I ate the $247 fine knowing that it should have been MUCH worse.....

Ah....the days when I was Young and Immortal....

[This message has been edited by WKDFIRO (edited 01-28-2000).]

this wind resistence you guys are talking of... i am a college student and had physic's last semester... and what if you had a "tail wind" (one blowing the same direction your are going), according to my studies, that would make your go faster.... hmmm... but i cant remember the equation... so dont ask i guess thats why i made a "C" in the class..

chris

Yes, Chris, a tail wind effectively subtracts from wind resistance from the front. So if you had a tail wind of, say...125mph, and your Fiero could go 125 with no wind, College physics says that you can now go 250MPH!!! Which is great until the wind shifts 90 degrees, and blows you laterally into the next state! Usually happens just as you suck the doors off of a CHP cruiser, too. ;}

I did the radar trick with my foot all the way into it..127 mph. The officer did not congratulate me for having fine auto ?!? and no license for ninety days was the judge's opinion!! That was stock 2.8, flat road and about 40 degrees f.