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Discussing EFI vs. Carb in the 5.0 Mustangs Forum. Ive got a 88 lx coupe. It was a factory 4 cylinder car, the i ...

       

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Old August 29th, 2007, 02:54 AM   #1
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EFI vs. Carb


Ive got a 88 lx coupe. It was a factory 4 cylinder car, the i guy i bought it from swaped in a 302 but converted it to carb. I have heard good and bad things about carb but i considering converting it back to EFI. I am looking at getting a supercharger thats why i want to switch it. What all is going to be needed to convert it back. Intake, Injectors, Harness, Computer. Since it was a factory 4 cylinder car will the entire harness need to be changed or can i just get a hold of an EFI harness and plug it in.
 

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Old August 29th, 2007, 10:10 AM   #2
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Get a complete harness and computer from a junk yard. Swapping back to EFI is not a big deal at all. You will obviously need all of the sensors as well.
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Old August 29th, 2007, 12:27 PM   #3
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dont u need dif fuel lines too?
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Old August 29th, 2007, 12:34 PM   #4
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Originally Posted by My'StangOpens
dont u need dif fuel lines too?
Depends on the conversion. You can keep the stock lines and pump with the right regulator. It's something he'll have to tell us about.
 
Old August 29th, 2007, 02:38 PM   #5
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Why not just use a blow through carb?
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Old August 30th, 2007, 02:36 AM   #6
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As far as i know the stock fuel lines are used, i am not sure if there different in a 4 cylinder car the fuel line is on the passenger side towards the front its looks like theres two but only one is used running through a regulator up to my carb. Are a 302 fuel lines in a different location?
 
Old August 30th, 2007, 02:40 AM   #7
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just run carb, its way easier to work on, you can tweek little things on the carb to get performance rather than buying like 10 things to do that 1 thing for fuel injected..a nice carb, intake, heads, cam and exhuast..the thing will tear..
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Old August 30th, 2007, 02:42 AM   #8
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Re: EFI vs. Carb


Originally Posted by gtstang87
Ive got a 88 lx coupe. It was a factory 4 cylinder car, the i guy i bought it from swaped in a 302 but converted it to carb. I have heard good and bad things about carb but i considering converting it back to EFI. I am looking at getting a supercharger thats why i want to switch it. What all is going to be needed to convert it back. Intake, Injectors, Harness, Computer. Since it was a factory 4 cylinder car will the entire harness need to be changed or can i just get a hold of an EFI harness and plug it in.
"I am looking at getting a supercharger thats why i want to switch it."

you know you can run a super charger on a carbed motor right..and there more of a bolt on install..with FI motor you have to change injectors, FPR, fuel pump, MAF, computer and everything else.jpjp.but is way easier for carbed..
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Old August 30th, 2007, 12:25 PM   #9
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Yea but don't you have to get a special carb to run a supercharger. And i heard that it is hard to tune.
 
Old August 30th, 2007, 12:40 PM   #10
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Originally Posted by gtstang87
Yea but don't you have to get a special carb to run a supercharger. And i heard that it is hard to tune.
tune a carb?

i thought all you did was jet it?

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Old August 30th, 2007, 01:55 PM   #11
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Originally Posted by gtstang87
Yea but don't you have to get a special carb to run a supercharger. And i heard that it is hard to tune.
Yes, it needs to be modified to be used as a blow thru which you can do yourself or you need to get an enclosure for the carb that various companies such as Vortech sell.
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Old August 30th, 2007, 01:57 PM   #12
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Originally Posted by My'StangOpens

tune a carb?

i thought all you did was jet it?

That is funny because most people think all you have to do is jet the carb. There is so much more to a carburetor. We picked up 37 horsepower just by changing air bleeds in my carb. There is alot more to carburetion than people think. Carburetors are not just bolt on and go.......well you can bolt them on and go but you will be leaving a ton of power under the table.
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Old August 30th, 2007, 02:00 PM   #13
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Air bleeds, power valves, jets, float height.....
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Old August 30th, 2007, 02:26 PM   #14
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but for the most part its not really "tuning" as in EFI

more like.. adjusting, like suspension to get the best ride quality

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Old August 30th, 2007, 02:28 PM   #15
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tune /tun, tyun/ Pronunciation Key - Show Spelled Pronunciation[toon, tyoon] Pronunciation Key - Show IPA Pronunciation noun, verb, tuned, tun·ing.
–noun

to adjust (a motor, mechanism, or the like) for proper functioning.

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Old August 30th, 2007, 02:29 PM   #16
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arr

you cant use my word to define yours

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Old August 30th, 2007, 02:31 PM   #17
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Does anyone around have a good daily driven carb setup. I really want something reliable that i don't have to fight to crank everytime i drive it. I have a eldelbrock carb now if i keep it carb i would like to get a holley. What are some good choices? As far as supercharging it i am in no hurry my car makes good power with the set up i have it just needs to be cleaned up a bit, and i hate having to pop the hood and flip the choke to crank it if it hasnt been run in a while.
 
Old August 30th, 2007, 02:33 PM   #18
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Originally Posted by gtstang87
Does anyone around have a good daily driven carb setup. I really want something reliable that i don't have to fight to crank everytime i drive it. I have a eldelbrock carb now if i keep it carb i would like to get a holley. What are some good choices? As far as supercharging it i am in no hurry my car makes good power with the set up i have it just needs to be cleaned up a bit, and i hate having to pop the hood and flip the choke to crank it if it hasnt been run in a while.
if you tune it right it shudnt be hard to start up

my gramps got a carb'd 302 in his crown vic and it never has any problems (until winter time)
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Old August 30th, 2007, 04:17 PM   #19
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My carbed 88 has better driveability than my EFI 89. They both run 11s 1/4 miles. The carbed car starts right up, idles smoothly and never surges. My EFI car surges under load below 1500 rpms and idle surges on start up everytime for about 10 seconds. The EFI car gets about 5 mpg more in town, but the engine is also 50 cubes smaller.

I don't drive either in the winter, but if I had a death wish and liked to drive my fox mustang in the snow, I'd opt for EFI or an electronic choked carb.

As for tuning a carb, people usually start with the main jets and then "F" the carb up so bad and then can't figure out why they can't tune it in. Fine tuning should be done with the air bleeds like Darrell said, unfortunately 4150 holley carbs don't come with serviceable air bleeds. The main jets are only for large changes and affect the A/F throughout te RPM range at WOT. If you buy a decent carb that is set up for your application the main jets should already be correct or at least very close. For a blow through carb, you are looking at a totally different animal and your best bet is to buy one from a reputable builder/ tuner. There is a whole forum section of turbomustangs.com about blow-through carbs.
 
Old August 30th, 2007, 04:31 PM   #20
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What would be a good carb for a stock 302. I might get a pair of gt 40 heads or some other mild flowing heads. Ive got a AED throttle cable bracket but it doesnt fit my eldelbrock carb very well i kinda had to make it work. Its made for a holley. I am new to carburators would a 650 cfm holley be a good choice?
 
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