From what ive heard the stock fiero intake is very restrictive and theres not much you can do about it. ive seen the truleo and dual throttle body intakes but they're kinda hard to find and pretty expensive. i was wonering if it was possible to get better performance and less restriction with a carb setup? maybe a holley 4bbl? would it be worth it?
Probably not. The 2.8L is a fine engine, don't get me wrong. But trying to make the engine put out more HP is a waste of time and money. There was an aftermarket plenum that I had seen that was bigger and supposedly helped with Airflow, but I can not recall where I had seen it. Carburetor's are fine, but you can get better economy and can also increase power accordingly with fuel injection.
A 4 barrel carb on a 2.8 it had better be one tiny 4 barrel. Sorry its late and I should be taking my nap but WTF are you smoking? I want some of that sh!t !
I dont have extensive knowledge on carburetors but cant you get a lower cfm 4bbl carb? like one closer to what the engine shoud be flowing to run at peak efficiency? This is my first fiero and im 15, im still learning, so cut me some slack i know some of my questions may sound stupid.
Steve forgets that he was young once... probably because it was so long ago.
Ayup my kids say I am older than dirt, Dino my pet dinosaur gets pissed when they say that as well !
To be honest I never realized they made a four barrel that small, it must be Sooooooo Cute.
But then if you just want to pump more fuel into the engine it might be more cost affective just to get injectors with more flow. Patrick is right, if it ain't a V8 I really don't think of putting 4 barrel carbs on it ! Hell my yard plow has an Edelbrock 850 on it and that was like the smallest one I could use on a 400 CI engine. But I don't think just pumping in more fuel is going to do much as far as increasing power for as small an engine as you are talking about, remember there are many other factors involved in making an engine faster, intake, exhaust, valve sized, cam duration.
Hey what can I say I am still trying to figure out how to drop a 70 Eldorado 500 CI 400 HP engine into a Fiero. More power,
AUGH AUGH AUGH !
If it ain't a big block V8 it ain't worth the work of putting it in !
[This message has been edited by 84fiero123 (edited 08-09-2014).]
I wasn't thinking extra fuel so much as eliminating the restrictive intake at a more affordable cost than buying a dual throttle body or trueleo intake. i really like the 2.8. i cant quite put my finger on it but there's just something about it that makes me wanna keep it and try and tune it up a bit. i dont need a rocket ship i just want something with USABLE power. something that i can put my foot down and hear it scream without having to worry about it getting too out of hand. even just a bump up to 160hp would do the trick i think. i was thinking maybe instead of going a carbureted route maybe just get a bigger cam and lifters and a better flowing exhaust. i wonder what the gains would be and if they'd be worth it.
A carburetor is an ignorant fueling device, meaning that it does not have the ability to adjust to the engine demand. On the other hand an EFI system constantly adjusts to conditions of temp, load, speed and exhaust gas makeup. If you tune a carburetor properly you can make horsepower in a very limited RPM band as in a race car where the RPM's stay high. Overall drivability is far better with EFI, not to mention that you grossly violate EPA and state emissions laws with a carburetor on later model cars. Bottom line is that you won't make more horsepower and you will use more fuel by using a carburetor.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
A carburetor is an ignorant fueling device, meaning that it does not have the ability to adjust to the engine demand.
Are you sure about that Dennis? I have not driven a carbureted car or truck in at least the past 25 years, but all of my yard equipment is carbureted and they all respond to increased loading with increased fueling without changing the RPM.
Originally posted by lateFormula: Are you sure about that Dennis? I have not driven a carbureted car or truck in at least the past 25 years, but all of my yard equipment is carbureted and they all respond to increased loading with increased fueling without changing the RPM.
They don't provide any more fuel than the jets in the carb allows them to provide. The fuel supplied is proportional to how wide the throttle is opened, but the jet doesn't open up wider to let more fuel in if needed, and the amount of fuel isn't adjusted based on atmospheric pressure. With EFI though, the injectors can be held open for a longer or shorter amount of time, based on a multitude of variables. You can't exceed the capacity of what the injectors can flow, though, so if adding boost or building a race prepped engine, you'll need bigger injectors. Modern cars can easily maintain a 14:1 AFR, but on a carb, you can't do that so well, as the jets won't necessarily provide the right amount of fuel to do that throughout an engine's entire RPM range.