EFI to CARB conversion!

Five0 · 01-03-2001, 05:15 PM

I am thinking about converting from efi to carburetor in my mustang, what is everyone's opinion on this?
What kind of difference will it make?

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

[This message has been edited by Five0 (edited 01-03-2001).]

racingrev1140 · 01-03-2001, 06:23 PM

Quote:

Originally posted by Five0:
I am thinking about converting from efi to carb in my mustang, what is everyone's opionion on this?
What kind of difference will it make?

hi five o ihad a 84 mustang which was carb from the factory iliked it but i was getting beat up buy the fuel injected guys until igot tired and went with a 351 w set up whichwas also carburated the engine was nothing to extreme but it did run 1140,s@116mph im not nocking fuel inj but i could not see spending all that money on two intakes an all the computor goodies well enough of that if you like send me a email and i can tell you more about the engine and its parts

Five0 · 01-03-2001, 06:34 PM

I talked to a performance shop and they told me that if I went to carburetor I would be faster if it is done right. I can sell the parts I have now for the fuel injection to buy the parts for the conversion but I want a few more opinions.

Right now I am having a problem tuning the car with all the stuff done to it and I don’t want to spend a lot more money on the computer.

I can get it to run the best at the track and it runs like $hit when it is cold and I am going to get a 393 stroker soon and I want to be sure it works without a lot more changes to the computer.

My cam makes power to +6500 rpm's but my rev limiter cuts out at 6250.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

racingrev1140 · 01-03-2001, 09:06 PM

i must say that going with a srocker set up is the way to go i was going to build a 404 strocker but right now i have other priorities ive seen several late model mustangs with the strocker and. carb set up and they haul butt,you wouldnt go wrong with the carb its like any thing else it has to be tuned properly and add a little nos to the formula and you are really flying good luck R.R

Five0 · 01-04-2001, 06:46 PM

Does anyone else have anymore input on this subject.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

Five.0 · 01-04-2001, 08:34 PM

hey Five0, thanx for stealing my name, i had to change mine to Five.0, anyway, just buggin ya man, man let the fuel injection be, dont mess it up with no ancient carb, hell it'll be a mess for nothing. thats only my opinion.

[/B][/QUOTE]

94GT, shorty headers, pro-chamber h-pipe, 2 chamber flowmasters, mac pulleys, ram-air, superchip, and 3:73's riding on 275/40/17's all around.

racingrev1140 · 01-04-2001, 08:44 PM

Quote:

Originally posted by Five.0:
hey Five0, thanx for stealing my name, i had to change mine to Five.0, anyway, just buggin ya man, man let the fuel injection be, dont mess it up with no ancient carb, hell it'll be a mess for nothing. thats only my opinion.

hey man dont knockm ittilyou try it carbs work for me plenty fast for a lot less money really

94GT, shorty headers, pro-chamber h-pipe, 2 chamber flowmasters, mac pulleys, ram-air, superchip, and 3:73's riding on 275/40/17's all around.[/B][/QUOTE]

Five0 · 01-04-2001, 08:54 PM

The tune ability is easer from what I hear and I won't have to deal with the stock rev limiter. There is a guy at a speed shop here in town that runs 11.40's on motor with a carburetor and he said he only ran 11.70's with the fuel injection and I am just wondering if it will help me too.

Sorry about the name!!! Hehehe

BTW: That is also my nic name.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

Moxie · 01-05-2001, 01:20 PM

All things being equal, you'll go faster with a carburetor. At least naturally aspirated. A lot of that has to do with the differences in intake manifold design between carbs and EFI, more than the method of fuel delivery.

Tuning is less expensive with a carb, at least initially. Carb parts are inexpensive, and you can do it yourself with a screwdriver, instead of either a) paying someone to burn a chip; b)buying a laptop, aftermarket EFI, and learning to do it yourself.

Now keep in mind, cold starts and poor weather driveability are no better with a carb, and often worse. EFI has the ability to compensate for changes in temperature, humidity, altititude, and barometric pressure. Carbs do not.

If you have any plans of running a supercharger or turbo, you may want to stick with EFI. There are a few setups available to work with carbs, however, few people run them and even fewer people really know how to tune them well. Of course, if you want nitrous, well, that works with everything.

------------------
Moxie Racing

red82gt · 01-05-2001, 02:18 PM

At the track you'll gain some but on the street you'll lose a fair bit. I can't race a fuelie mustang from a roll but from the digs it's a different story. If you're running that fast in the 1/8th mile then you've probably got a combo that'll lend itself well to the short runners of the carb intake.

Because my car is street driven and the fact I'd like to go to a Paxton Novi 2000 I'm thinking of going the other way and going fuel injection.

------------------
GT-40 heads (ported, polished, + milled), B303 cam, 1.7rr's, JE pistons, Offy intake, Carter AFB 625cfm carb, Flowtech 1 5/8" shortys, Flowtech X-pipe, MAC Flowpath exhaust, MAC pulleys, 373's, subframes, Eibachs+Tokicos, B+M ripper, FMS Clutch, Zoom Quadrant+cable, 17" CSA Ultra rims, 235/45ZR17 Yokohama AVS S4's, MSD 6A ignition+coil, FMS 9mm wires, Carbed, Naturally Aspirated, and Nasty!

Five0 · 01-05-2001, 03:06 PM

I had not really thought about the supercharger much but I would like to go supercharged eventually. I guess I have the best set up for that. Thanks for the reply.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

pro88 · 01-07-2001, 05:27 PM

I was never a big EFI fan. I don't like the idea of a computer telling me how my car should run. Carb and old school all the way!!! After I took my EFI off my car and eventually put in a '69 351W I'm liking the big, big ET gains. No computer for me.

Five0 · 01-07-2001, 07:22 PM

Do they sell superchargers or turbos for carb's that are worth a damn.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

01-07-2001, 11:15 PM

First, if you are thinking about Turbo's or Superchargers then stay with EFI.

I am in the process of converting my EFI 347 to Carb right now and here are some things to consider.

1.) You will need a Sump on the back of the car. You could modify the Stock fuel tank, but you risk rust forming around the weld if it is not done just right. The really safe method is to put a Fuel Cell in your car and ditch the Factory Tank, which is what I am doing.

2.) Plan on investing money in the following: Carb, Distributor, Fuel Lines, Fittings, Intake, Fuel Pump, and carb style filter.

3.) If you plan on getting a new carb, let me tell you the good ones run you 500$ and up easy, they ain't cheap.

4.) No computer means no auto compensation for very cold weather or very hot weather, it's all up to YOU! to adjust the carb to meet those conditions.

So, what is the plus for going with a carb?
Well for me it was a real pleaure yanking all that computer junk out from my car and shoving into a box, never having to worry about rev limitations and sensors going haywire and allot of other junk that was acting funny as my motor got more and more radical.

Anyway, just a few bits of info.

James

Five0 · 01-08-2001, 02:32 PM

I think I have decided to go with the carburetor.
A friend owns a performance shop for mustangs and he said he has all the stuff to do the conversion and will just swap out the parts and help me install them. So I am going to go up and talk to him more tomorrow and get started, I hope I like this as much as I think I will.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

Five0 · 01-08-2001, 02:34 PM

BTW: will this change the sound much, if so how much and how will it change?

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

racingrev1140 · 01-08-2001, 08:01 PM

hey five o con grats on your choice you won,t be sorry man lots of power if all is done right RR

Five0 · 01-09-2001, 07:20 PM

O-well, no turning back now. I pulled the EFI off the car today and started putting on the carbureted setup, should be done tomorrow.
I’ll let everyone know how it goes.

------------------
James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph

[This message has been edited by Five0 (edited 01-09-2001).]

01-03-2001, 05:15 PM	#1
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	EFI to CARB conversion! I am thinking about converting from efi to carburetor in my mustang, what is everyone's opinion on this? What kind of difference will it make? ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph [This message has been edited by Five0 (edited 01-03-2001).]

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Carb to FI conversion	SlowMopar	Windsor Power	5	04-11-2004 04:29 PM
Interesting timing issues on my carb conversion	crazypete	Windsor Power	16	10-07-2002 07:50 AM
Throttle body to carb conversion	Budiak	Classic Mustangs	3	07-02-2002 02:04 AM
anyone did a carb conversion and still used stock ignition system????	vande97	Windsor Power	6	04-25-2002 10:17 AM
dual carb conversion	95GTS	Classic Mustangs	10	10-03-2000 09:05 PM

01-03-2001, 06:34 PM	#3
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	I talked to a performance shop and they told me that if I went to carburetor I would be faster if it is done right. I can sell the parts I have now for the fuel injection to buy the parts for the conversion but I want a few more opinions. Right now I am having a problem tuning the car with all the stuff done to it and I don’t want to spend a lot more money on the computer. I can get it to run the best at the track and it runs like $hit when it is cold and I am going to get a 393 stroker soon and I want to be sure it works without a lot more changes to the computer. My cam makes power to +6500 rpm's but my rev limiter cuts out at 6250. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-03-2001, 09:06 PM	#4
racingrev1140 Registered Member Join Date: Jan 2001 Location: pittsville md u.s Posts: 9	i must say that going with a srocker set up is the way to go i was going to build a 404 strocker but right now i have other priorities ive seen several late model mustangs with the strocker and. carb set up and they haul butt,you wouldnt go wrong with the carb its like any thing else it has to be tuned properly and add a little nos to the formula and you are really flying good luck R.R

01-04-2001, 06:46 PM	#5
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	Does anyone else have anymore input on this subject. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-04-2001, 08:34 PM	#6
Five.0 Registered Member Join Date: Oct 2000 Location: montreal, canada Posts: 19	hey Five0, thanx for stealing my name, i had to change mine to Five.0, anyway, just buggin ya man, man let the fuel injection be, dont mess it up with no ancient carb, hell it'll be a mess for nothing. thats only my opinion. [/B][/QUOTE] 94GT, shorty headers, pro-chamber h-pipe, 2 chamber flowmasters, mac pulleys, ram-air, superchip, and 3:73's riding on 275/40/17's all around.

01-04-2001, 08:54 PM	#8
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	The tune ability is easer from what I hear and I won't have to deal with the stock rev limiter. There is a guy at a speed shop here in town that runs 11.40's on motor with a carburetor and he said he only ran 11.70's with the fuel injection and I am just wondering if it will help me too. Sorry about the name!!! Hehehe BTW: That is also my nic name. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-05-2001, 01:20 PM	#9
Moxie Registered Member Join Date: Aug 2000 Location: Plymouth, MI Posts: 254	All things being equal, you'll go faster with a carburetor. At least naturally aspirated. A lot of that has to do with the differences in intake manifold design between carbs and EFI, more than the method of fuel delivery. Tuning is less expensive with a carb, at least initially. Carb parts are inexpensive, and you can do it yourself with a screwdriver, instead of either a) paying someone to burn a chip; b)buying a laptop, aftermarket EFI, and learning to do it yourself. Now keep in mind, cold starts and poor weather driveability are no better with a carb, and often worse. EFI has the ability to compensate for changes in temperature, humidity, altititude, and barometric pressure. Carbs do not. If you have any plans of running a supercharger or turbo, you may want to stick with EFI. There are a few setups available to work with carbs, however, few people run them and even fewer people really know how to tune them well. Of course, if you want nitrous, well, that works with everything. ------------------ Moxie Racing

01-05-2001, 02:18 PM	#10
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	At the track you'll gain some but on the street you'll lose a fair bit. I can't race a fuelie mustang from a roll but from the digs it's a different story. If you're running that fast in the 1/8th mile then you've probably got a combo that'll lend itself well to the short runners of the carb intake. Because my car is street driven and the fact I'd like to go to a Paxton Novi 2000 I'm thinking of going the other way and going fuel injection. ------------------ GT-40 heads (ported, polished, + milled), B303 cam, 1.7rr's, JE pistons, Offy intake, Carter AFB 625cfm carb, Flowtech 1 5/8" shortys, Flowtech X-pipe, MAC Flowpath exhaust, MAC pulleys, 373's, subframes, Eibachs+Tokicos, B+M ripper, FMS Clutch, Zoom Quadrant+cable, 17" CSA Ultra rims, 235/45ZR17 Yokohama AVS S4's, MSD 6A ignition+coil, FMS 9mm wires, Carbed, Naturally Aspirated, and Nasty!

01-05-2001, 03:06 PM	#11
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	I had not really thought about the supercharger much but I would like to go supercharged eventually. I guess I have the best set up for that. Thanks for the reply. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-07-2001, 05:27 PM	#12
pro88 Registered Member Join Date: Dec 2000 Location: roseburg, oregon Posts: 87	I was never a big EFI fan. I don't like the idea of a computer telling me how my car should run. Carb and old school all the way!!! After I took my EFI off my car and eventually put in a '69 351W I'm liking the big, big ET gains. No computer for me.

01-07-2001, 07:22 PM	#13
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	Do they sell superchargers or turbos for carb's that are worth a damn. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-07-2001, 11:15 PM	#14
stanglx347 Guest Posts: n/a	First, if you are thinking about Turbo's or Superchargers then stay with EFI. I am in the process of converting my EFI 347 to Carb right now and here are some things to consider. 1.) You will need a Sump on the back of the car. You could modify the Stock fuel tank, but you risk rust forming around the weld if it is not done just right. The really safe method is to put a Fuel Cell in your car and ditch the Factory Tank, which is what I am doing. 2.) Plan on investing money in the following: Carb, Distributor, Fuel Lines, Fittings, Intake, Fuel Pump, and carb style filter. 3.) If you plan on getting a new carb, let me tell you the good ones run you 500$ and up easy, they ain't cheap. 4.) No computer means no auto compensation for very cold weather or very hot weather, it's all up to YOU! to adjust the carb to meet those conditions. So, what is the plus for going with a carb? Well for me it was a real pleaure yanking all that computer junk out from my car and shoving into a box, never having to worry about rev limitations and sensors going haywire and allot of other junk that was acting funny as my motor got more and more radical. Anyway, just a few bits of info. James

01-08-2001, 02:32 PM	#15
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	I think I have decided to go with the carburetor. A friend owns a performance shop for mustangs and he said he has all the stuff to do the conversion and will just swap out the parts and help me install them. So I am going to go up and talk to him more tomorrow and get started, I hope I like this as much as I think I will. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-08-2001, 02:34 PM	#16
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	BTW: will this change the sound much, if so how much and how will it change? ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph

01-08-2001, 08:01 PM	#17
racingrev1140 Registered Member Join Date: Jan 2001 Location: pittsville md u.s Posts: 9	hey five o con grats on your choice you won,t be sorry man lots of power if all is done right RR

01-09-2001, 07:20 PM	#18
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	O-well, no turning back now. I pulled the EFI off the car today and started putting on the carbureted setup, should be done tomorrow. I’ll let everyone know how it goes. ------------------ James Cox nochevy@hotmail.com 1991 Mustang LX Best 1/8 time on motor 7.686 @90.20mph [This message has been edited by Five0 (edited 01-09-2001).]