Just wondering whats better about Carbs over TPI. I've heard TPI Can't get gas in fast enuf, And if you Don't tune Carbs properly, They can be a pest. But I was having an argument the other day with a friend of mine over what engine would haul more @$$.

Assuming the two are the same, A properly tuned carb VS TPI.

I did a search but everyone was sorta this way or that. What besides personal preference makes the diff?

 

umm, assuming air intakes that flow the same and that both are tuned perfect....

they would make the same power.



at this point its either personal pref or money... thats about it.


if you know what you're doing, you can make either one work great.

if you dont know what you're doing, they both will run like ****.


either way, they haul the same @ss.

 

EFI is better. EFI will give better part throttle cruising. EFI is infinetly tuneable so you might see more total power across the RPM range but peak power won't change much. Most out of the box carbs will work well enough to putt around town before you have to tune them, if you are expcting to get every 1/10 second then you have a big task of perfecting every last passage way in that carb. EFI will monitor your ignition, air and fuel before, during and after combustion and change things accordingly. Injectors already spray a fine mist directly into the combustion chamber at a hig pressure forcing it to mix with the air. This all by itself improves volumetric efficieny resulting in more torque and not having to buy a high rise carburated manifold.
The computer will also figure out and remember on it's own what the best injector pulsewidth is across the entire RPM range. This is something that can only ordinarily be done on a dyno with a carburator. My advise, EFI. If you don't believe me, get a carburator and try to start it on a cold morning.
Tibo

 

and when you stop cranking the car and complain it wont start, i'll reach over and yank the choke..... and it'll fire right up..


or better yet, get a elec choke.... get in the car, turn key on, mash the pedal to the floor one time and start it.


not starting on a cold morning is either operator error or a improper setup.

the world did not stop moving and switch to horses in the winter time before everyone had EFI.






i hearby declare from your other statments that you are unfit in the knowlage of how carbs work and what makes a EFI system efficent and ban you from this thread..... why? cause im a senior member.. yea.. thats why...




btw, you're a idiot if you just plop a carb on there..... just like you're a idiot if you just plop a 305 TPI setup on a diff motor.... nieter will be optimized... and therefore are NOT part of this conversation..

nither EFI or carbs are hard to learn or modify. you just need to know how... and that knowlage is easily obtainable... you just need to READ and then DO.


btw, i dont favor carbs personally... but that last statement i quoted was just the stupid statement that broke the camels back.... and you dont have to mod every "passage" in the carb for it to work properly

 

btw unless you have experiance in carbs and EFI, i dont think anyone is looking for your facts in this thread.

rephrased

unless you have experiance in EFI and Carbs, i dont think anyone is looking for your facts in this thread.





and note i said FACTS! NOT OPINIONS.


btw, as far as WOT, and i assume yuo mean mostly WOT since you're talking about hauling ***...

they are nearly identical....

 

Well I guess as opinion, I love Carbs, Dunno just somthing about seeing her open up. Same as driving a stick. Matter of preferance.

I love my carb, And altho I havn't had the chance to give her a proper break in, I love it so far. I think it sounds better too, But could just be me

 

Depends on the rest of the motor, and the intended use.

Depending on emissions rules in your locale, you may not have a choice.

There is no possible way to make TPI flow equal to a carb. Note that I said "TPI", not "EFI". TPI is a special case, in that it uses very long, small-diameter runners to produce a "tuning" effect that enhances cylinder fill in one RPM range (3400-3800) at the expense of cylinder fill at any RPM above about 4500 RPM. It gives great "grunt" for the street, but is not at all capable of being competitive in a racing situation. You see all the time how people have heads, cams, aftermarket runners, headers, chips, etc. etc. etc., and still can't run with a showroom stock LS1; that's kind of a good indicator of the problem. Again, it's not "EFI" in general, it's "TPI" in particular that has this problem. The MiniRam, Stealth Ram, SuperRam, ProRam, etc. (seems to be a whole lot of ramming going on these days) will provide a whole lot more power, but out of those the only one that's 50-state legal is the SuperRam, and it's also the most difficult to work on and to set up right.

It always amuses me to see young people who have never even worked on carbed cars, besides somebody's where they halfway hacked one onto a TBI car or something, talk about how carbs don't start when it's cold and stuff like that. These people must surely think that for the last 100 years, people didn't drive in the winter or something, and that it only became possible to operate a car between November and March in the last few years. Pretty funny stuff.

I couldn't care less about how it sounds, or how it looks. I'll leave that to the monkey-spankers. I care about how it goes. By that standard, I won't run TPI; I might run some other FI system; and I currently run a carb in most of my own cars. Apart from TPI's specific limitations, the motor does not care where the fuel comes from; it's all about fuel and air, nothing but fuel and air; and both carbs and FI have the ability to deliver those things. Given a properly tuned carb setup and a properly tuned port FI setup other than TPI, there is little difference in performance potential.

 

That was exactly the answer I was looking for, Thank you very much

 

Lather, rinse, repeat.

 

I ran both on the same motor and the Carb setup would pull to a higher rpm than the TPI, when I say pull, you can feel the car still accelerating, unlike the TPI which would rev to 5500, but from 47-5500rpm, it didn't go any faster, just revved up.
I chose TPI over the carb mainly for aesthetic reasons. I like the high-tech look of it.
If I were going for max power, I'd go with a carb setup for less hassle and much less cost. One sensor on the EFI setup can cost about as much as a carb.

I've got an LT1 in my 86 Trans Am and TPI in my 88 Formula. I plan on putting the Stealthram on the Formula next year for a little better performance.

 

Monkey-Spankers?!? Hilarious !!

 

I'm thinking about getting an 86 LG4 305 4bbl - 5 speed a family member is talking about selling. I have driven it a few times. The mileage isn't poor but not great. Will converting the carb to any form of FI get better mileage assuming I give the carb and engine a complete tune-up?

 

Mr Dude_1
I am not offended by your comments at all. However, I am sure that the staff at car craft would be though. You see, in an effort to help another person (instead of belittle) I actually went upstairs and got the article from the Car Craft August 2003 issue that had the article "Carb vs. EFI: How it Works." I then went to the computer and started copying things from the article that would be of use. (Give me your address and I can send you the article) Not one sentence there was opinion. Car Craft alone did not write that article. They had sources such as Accel/Mr. Gasket, Fuel Air Spark Technologies(FAST), and Holley performance products. Nothing in that article was opinion, just facts from professinals who have been working on engines before you could even say the word. So I'll take an apology and so will car craft. I don't care how many threads you post or if you are a "Senior" member, everyone can always learn. So I declare you ignorant and unable to post anymore threads before you can back up what you say with some solid sources of information and facts.

 

so you can copy and paste from a fugging magazine. im so impressed.


i didnt say any of the facts you stated were "wrong". i said that the last statement you made was pretty fuggin stupid.

i stand by that. you have ZERO probs starting a properly carbed car when cold.

note that the facts not opinion thing i said is even a diff post.. for everyone.. because i dont think anyone is looking for someone elses opinion, just facts.
most carb Vs EFI threads turn into that crap anyway..


so instead i think i'll stand by my previous statment and reccomend you put down car craft learn to work on carbs, then learn to work on EFI and then feel free to reply in this thread.


ps, dont be stupid, everyone who posts enough here is a fuggin "senior member" it doesnt mean dick besides the fact that the person posts alot.... i can point out people that have 2k+ posts in the audio forum that dont know dick about the engine... the "status" means nothing....

 

id also like to point out two things.


1. in the world of automobiles, nothing is "better" then the other. to make a better statement is usually ignorance.

2. you didnt compare, or really say anything about carbs or the pro and con.... everything is pro and con.


you just used a blanket better statement and thats it

lets look at everyone else who just replied

RB83L69, this guy seems full on nice lil bits of info.. he should, hes been building engines for years and years... havent asked him, but i think he works in a engine shop or somthin

Zepher: hes had more engines in and out of his TA in the past 2 years then anyone ive ever met whos not a racer(online or off).
hes had a carbed SBC, a LT1, converted to TPI, you name it.



you'll notice both of them read the question and gave a good detailed answer.... it isnt EFI vs carb.. its TPI.... and really its not a fair contest... TPI flows like **** at high RPM, any performance carb intake doesnt.






its good to see you're "I am not offended by mycomments at all"

cause im not trying to offend you. just saying dont talk about being where you havent been.

PS: if you really wernt offended, why did you PM the same damn thing as your reply above? i already read it here before you even PMed me.

 

We are refering to Tuned Port Injection, not EFI in general, a carb will out proform a tpi setup in a racing situation in the upper rpm range where it counts. As far as starting a carbed car in the winter my 73 Nova starts with one pump of the gas pedal and half a crank of the starter in any weather. Try doing that with an EFI setup, my carb requires no feedback from any sensors to start the car.

 

Same with my '85 Buick 4bbl 307.... always started instantly, one of the best cars I ever owned *sniff sniff* I miss it......