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Author
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Topic: what is better carbd or efi
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talaposa
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Member # 2460
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posted
 
 
The carburetor has to proportion the fuel supply by utilizing the flow of air into the engine. It's effectiveness is therefore limited by the cubic inches of the engine.This is a problem not faced by FI units since the computer calculates air fuel ratio. Therefore EFI can effectively use as much CFM as can be applied which is not the case with the carb. The carb, however, produces a cooling effect to the air resulting in a denser mixture which is not the case with port injection. Throttle bodies also produce denser air but have turbulent resrictions to flow due to the position of the injectors. Keep in mind that the minority of FI systems have on the spot programming capability and this is the archilles heel for FI. Chips are a help but to get the maximum from FI the timing and fuel map must be programmable on the spot. My vote is with FI aftermarket units.
Posts: 91 | From: Auburn,CA | Registered: Feb 2003
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talaposa
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Member # 2460
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posted
I know at least one 454 carburated rat powered model A that has learned due respect for one little FI falcon with a 900 CFM throttle body.
I like the throttle body (I hear the boos already) because of stealth. It looks stock and fits in tight quarters. Best of all, with a few strokes of the keyboard I can dial in any fuel or ignition curve I want.
Posts: 91 | From: Auburn,CA | Registered: Feb 2003
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JoeT
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Member # 298
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quote:
Originally posted by talaposa:
The carburetor has to proportion the fuel supply by utilizing the flow of air into the engine. It's effectiveness is therefore limited by the cubic inches of the engine.This is a problem not faced by FI units since the computer calculates air fuel ratio.
Huh? The only advantage in tuning an EFI setup has over a carb is in partial throttle situations where the feedback loop presents real-time air/fuel trim information to the injectors. And of course the engineers seem to be able to push the envelope of boosted EFI motors more easily than the carbed camp, but don't tell that to top fuel (still carbed).
With a typical 4 barrel carb you can get a dead-nuts WOT tune on the secondaries and a decent idle/cruise tune on the primaries.
Don't forget that some manufactures (Dodge included) had carbed motors with O2 sensors, at that point we're really debating not much more than a fuel delivery system.
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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67stang
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Member # 549
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posted
quote:
Originally posted by talaposa:
The carburetor has to proportion the fuel supply by utilizing the flow of air into the engine. It's effectiveness is therefore limited by the cubic inches of the engine.This is a problem not faced by FI units since the computer calculates air fuel ratio. Therefore EFI can effectively use as much CFM as can be applied which is not the case with the carb. The carb, however, produces a cooling effect to the air resulting in a denser mixture which is not the case with port injection. Throttle bodies also produce denser air but have turbulent resrictions to flow due to the position of the injectors. Keep in mind that the minority of FI systems have on the spot programming capability and this is the archilles heel for FI. Chips are a help but to get the maximum from FI the timing and fuel map must be programmable on the spot. My vote is with FI aftermarket units.
![[Confused]](confused.gif)
Posts: 596 | Registered: Nov 2001
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67stang
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Member # 549
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posted
carbed cars have no potential as evident in the pic below:
Posts: 596 | Registered: Nov 2001
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chosen1
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Member # 1906
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posted
this single carb setup only made 1275 HP on 91 octane
[ March 19, 2004, 09:37 AM: Message edited by: Chosen1 ]
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1967 Fastback. Should go 10's -but doesn't
1993 Cobra
2003 Suzuki SVS
1966 Coupe -For Sale
Posts: 2205 | Registered: Sep 2002
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mustanggt5091
All I need is.....
Member # 444
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posted
quote:
Originally posted by Chosen1:
this single carb setup only made 1275 HP on 91 octane
Hahahahaha, I have a complete "aftermarket fuel injection" system and it is really nice. Once you get all the $$$$$$$$$ in tuning equipment to tune it and you learn what the hell you are doing. If you dont have the time to learn or the money to spend, go carbed its way easier and cheaper. As for the gear debate, my vote is 3.55's, thats what I got and IM sticking with them. ![[patriot]](graemlins/patriot.gif)
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88 GT 357w (SOLD):(
06 Limited Edition R6 !!!!!
Posts: 2353 | From: Fairfield / Santa Rosa , Ca | Registered: Sep 2001
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