Thread: 454 fiero

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Alright folks, I got this thing running like a top. unfortunetly I dont own the carb that im using but I do know that a dif carb will work wonders. I dont know what the big difrence is but a friend of mine is letting me use his holley 850 single feed dual bowl spread bore carb. he said it came off his olds cuttless 455. An this thing shits n gitts. it sucks its winter here in maine but this thing is balls to the walls. I cant even imagine what this would be like with a set of the aluminum heads makin another 100 hp. this thing is crazy. I am so happy i cant even express it. thank you to everyone on here for there ideas. they were all 100 % helpfull. No more flat dead spot. an its weird but it doesnt seem like its dumping as much fuel as the 750 was. It is a totally difrent car. I just need to find my own carb now LOL. so thank you all very much.

Cool! How about a burnout video to celebrate your new found power?

Good to hear. Now it's time to enjoy it, while gas is still under 3 bucks a gallon.

ok so I foweled the plugs But thats not a bad thing they were probably fowled from the 750 DP. The new carb just finished them off. Good news I found the same exact carb that I have on the motor now on craigslist an bought if for 53.00 shipped to me. It should be here with in a week. I am so happy. I will get the other carb rebuilt an installed an I will be ready to rock an roll. Im going to change the plugs too. LOL apparently they need it.

Ok this just doesnt end. So after a breif an i mean breif bit of hope. the car is running like shit again. Heres the deal. the other day when it was running great. I had the headers dumped an just a set of 90 degree pipes on it so when i drove down the road air didnt shoot up the headers an it ran like a dream. today I get all excited an what not hook up the exhaust that i had which was a two in to one high flow muffler an the pipe'n is 3 inch front to back. an the car barley runs at all. at first I thought I just fouled the plugs. so I take them all out an there black an soaked with fuel so i buy new ones put them in an now all of a sudden. the car still runs like shit. Im going to dump the headers again tomorrow. seems like when it was just open headers it was running awsome. now The car wont even move. an it was running so great. im so aggrivated. I litterally changed nothing about the car except puttign the exhaust back on. Not to mention I droped 3 gallons of gas in a half our period trying to tune the dame thing. an still no luck im out of gas how do you go thrue 3 gallons of gas in a half our with the car maybe running for 10 minutes out of that half hour. my dame samuria runns a whole week on 3%$#@@#$^ gallons. Im so frustrated now. I wish everyone could feel my pain. damit damit damit.

Ok I took the exhaust off an the car runs perfect. But now the mechanical fuel pump just craped out on me LOL. it never ends. all well atleast the fuel pump is only 26 dollars. an I have a carb coming so Its almost there.

Dont give up, bro. Sounds like you're closing in on it.

Originally Posted by fieroboy_gt

Ok I took the exhaust off an the car runs perfect. But now the mechanical fuel pump just craped out on me LOL. it never ends. all well atleast the fuel pump is only 26 dollars. an I have a carb coming so Its almost there.

and thats were all your fuel may be going check the dip stick see if it smell like gass

I was wondering the same thing Pat. You better check that oil hate hearing those big booms! that come with a gas filled crank case. When you had the other carb on your motor was your exhaust hooked up?
I've had motors that had lots of compression that could not breath because the the exhaust manifolds would not flow enough. The car ran fine with them off but when I put them on the car ran like crap, so I had to go with headers and some good high flow mufflers.
Kurt

Just a thought... Mechanical fuel pump, gas line routing, exhaust heat boiling the fuel in the lines and fuel is percolating down in to the intake after you shut it off?

SO yea there is def gas in the oil. so I have to change that before I wipe out a bearing or what not. Would that have been caused buy the pump craping out or buy the exhaust being too restrictive?

well very depressing news. the carb arived in the mail an the guy I bought it from mis printed the carbs ID number in the craig lists ad an it turns out to be the 650 spreadbore holley single feed double pump. I dont know if it will work. the one thats on the car is the 800 spreadbore holley. I will rebuild it this week an change the fuel pump as well an try it but the 760 didnt work the 800 works great I cant imagine the 650 working as good as the 800. Anyone on here run there 454 with a 650 quadrajet? i mean the 454 came stock with a 850 quadrajet or rockchester if im not mistaken. alwell at least i paid little to nothing for it. but im not happy

Im also a v8 fiero guy, but not to the extreme as the 454. im running a sbc. And i had same issue as you. What i suggest to you, get rid of mechanical fuel pump, run a in tank pump, reroute the lines to the side, slap a fuel cooler on the side with a small fan, route that to your carb, use a RPM airgap intake or some sort of highrise intake With a good 1-2 inch spacer on your carb. I know its alot of work, but on these small cars not much room to work, you need that cold gas. Hope your luck gets better.
Prox.

Not mine but I thought it would be something to look at. Its on ebay for sale right now. A very well built Fiero drag car front engine. ran a 9.51 @ 143 at Mile High Dragway.

http://www.axehaven.com/cars/FieroCollage.jpg

http://www.axehaven.com/cars/details.jpg

thats insane!