[itsmyfiveoh]

i am thinking about switching to a carb setup. im not real great with the efi stuff. beside the dist. what else need to be changed

[Tony_90fox]

Fuel system for sure.

[ryans88gt]

Originally Posted by Tony_90fox Fuel system for sure.

Not really, you just need to replace the regulator with a low pressure return style unit (mallory makes one) and plum it to the carb. The stock fuel pump flows pretty well at 7 PSI.

Really not much else has to be changed. There is some wiring that needs to be done if you want all your gauges and stuff to work and you need to rewire the fuel pump relay. However, after having done the EFI to carb, I would say unless there is a real reason to do it, your not gaining anything other than more time at the gas pump, although you don't have to worry about upgrading your whole EFI system everytime you add a bolt on.

[neverfastenough1]

Auto or stick? If you have a stick you're golden. If you have an AOD you will need a kickdown cable. You will also need a throttle cable form a carb'd foxbody I believe.

[1slo5.0]

Why switch to carb? I don't understand why some people want to do this besides for poor fuel economy......

[ryans88gt]

Originally Posted by Darrell Why switch to carb? I don't understand why some people want to do this besides for poor fuel economy......

For a heavily modified engine it is easier and cheaper to put a carb on there. But to convert a stock or mildly modified motor, I agree, there is no point.

[ryans88gt]

Originally Posted by neverfastenough1 Auto or stick? If you have a stick you're golden. If you have an AOD you will need a kickdown cable. You will also need a throttle cable form a carb'd foxbody I believe.

You don't need a new throttle cable, the stock cable will work, it's just a bit longer than it needs to be, so you have an extra loop of cable laying there.

[1slo5.0]

Originally Posted by ryans88gt For a heavily modified engine it is easier and cheaper to put a carb on there. But to convert a stock or mildly modified motor, I agree, there is no point.

And a heavily modified engine you won't be concerned about fuel economy but for a street car EFI is the only way to go especially if the car already has EFI.

Why make 500hp and get 10 mpg when you could make 500hp and get 20+ mpg with EFI.

[Stangzilla]

Originally Posted by Darrell Why switch to carb? I don't understand why some people want to do this besides for poor fuel economy......

Always wondered that myself..

[ryans88gt]

Originally Posted by Darrell Originally Posted by ryans88gt For a heavily modified engine it is easier and cheaper to put a carb on there. But to convert a stock or mildly modified motor, I agree, there is no point. And a heavily modified engine you won't be concerned about fuel economy but for a street car EFI is the only way to go especially if the car already has EFI. Why make 500hp and get 10 mpg when you could make 500hp and get 20+ mpg with EFI.

Cheap and easy beats contrived and expensive every time.
Even if I were to concede that EFI gets 10 mpg better fuel economy than a carb on the same engine (which I don't), you'd have to put 15,000 miles or more on the car to break even with the price of a carb. In reality, i get over 20 mpg on my car and run 11s. I doubt I could do much better with EFI, maybe 2-3 MPG? So, I'd have to put 100,000 miles on this motor to get close to spending the same money on gas as I would have on EFI.

If your car already has EFI, that doesn't change the fact that you have to put a tuner or chip on the computer, bigger injectors, a new MAF, new throttle body, new intake plumbing, wide band O2s etc... on your car. That's gets to be a pretty big bill and then you have to worry about one of your 30 sensors going out and ruining all your fun.

But as I said above, I agree EFI is better for a mildly modified car, or for forced induction, but don't use fuel economy as a selling point, because the expense of a well set up EFI system greatly exceeds any fuel savings you'll have. It's like saying you bought a hybrid to save money...

[1slo5.0]

Originally Posted by ryans88gt Cheap and easy beats contrived and expensive every time. Even if I were to concede that EFI gets 10 mpg better fuel economy than a carb on the same engine (which I don't), you'd have to put 15,000 miles or more on the car to break even with the price of a carb. In reality, i get over 20 mpg on my car and run 11s. I doubt I could do much better with EFI, maybe 2-3 MPG? So, I'd have to put 100,000 miles on this motor to get close to spending the same money on gas as I would have on EFI. If your car already has EFI, that doesn't change the fact that you have to put a tuner or chip on the computer, bigger injectors, a new MAF, new throttle body, new intake plumbing, wide band O2s etc... on your car. That's gets to be a pretty big bill and then you have to worry about one of your 30 sensors going out and ruining all your fun. But as I said above, I agree EFI is better for a mildly modified car, or for forced induction, but don't use fuel economy as a selling point, because the expense of a well set up EFI system greatly exceeds any fuel savings you'll have. It's like saying you bought a hybrid to save money...

You have an answer for everything don't you? EFI........ah nevermind. Its not worth it.

[Stangzilla]

Originally Posted by Darrell Originally Posted by ryans88gt Cheap and easy beats contrived and expensive every time. Even if I were to concede that EFI gets 10 mpg better fuel economy than a carb on the same engine (which I don't), you'd have to put 15,000 miles or more on the car to break even with the price of a carb. In reality, i get over 20 mpg on my car and run 11s. I doubt I could do much better with EFI, maybe 2-3 MPG? So, I'd have to put 100,000 miles on this motor to get close to spending the same money on gas as I would have on EFI. If your car already has EFI, that doesn't change the fact that you have to put a tuner or chip on the computer, bigger injectors, a new MAF, new throttle body, new intake plumbing, wide band O2s etc... on your car. That's gets to be a pretty big bill and then you have to worry about one of your 30 sensors going out and ruining all your fun. But as I said above, I agree EFI is better for a mildly modified car, or for forced induction, but don't use fuel economy as a selling point, because the expense of a well set up EFI system greatly exceeds any fuel savings you'll have. It's like saying you bought a hybrid to save money... You have an answer for everything don't you? EFI........ah nevermind. Its not worth it.

Exactly what I was thinking.... :lala :lala :lala

[ryans88gt]

its funny that there is a carb sitting on top of darrell's motor pic isn't it??

[Stangzilla]

That has nothing to do with it.. I am sure he has gone with both setups over the years as have I. Lets just agree to disagree.. Not worth the effort I think..

[bwb3]

oh goodie just like the launch tread!

[1slo5.0]

Originally Posted by ryans88gt its funny that there is a carb sitting on top of darrell's motor pic isn't it??

Yes there is and its also a 750 horsepower all out race motor. There is actually an 1150 Dominator sitting on it now and later this year it will be a DFI set up because my engine builder (who used to work for Accel DFI) guarantees me that it will make more power with fuel injection so I'm going to give it a try. I've run alot of efi set ups in the past. I wouldn't ever do a carb set up for a street car again.

[itsmyfiveoh]

the reason im switching is because i already have everything but the dizzy.my car is an 87 speed density i want a nice cam but cant get one because of this stupid s/d setup. does anyone know a cam i can run?

[neverfastenough1]

You could switch to maf. I had the recommended cams for a s.d. yesterday. I will try to find it again.

[neverfastenough1]

Scroll down on this thread.

http://50tech.com/viewtopic.php?p=51824

[shudahadav8]

Don't give up on EFI people. I know I'm new here but here's my opinion. I'm not new to Mustangs, started racing Mustangs in the Baltimore area in the mid 90's, I've now got over 10 yers experience racing Mustangs, both carb'd and injected. A properly tuned EFI car will out perform a carb'd car on the track and the street. I switched my '91 GT to a carb back in '98, I didn't have a lot of experience with injection at the time, in '01 my dyno guy convinced me to switch back to injection witha simple statement " I guaruntee you atleast 30 more hp across the board or I'll pay for the injection set-up", I took that bet. We went with the SDS set-up and low and behold, from 3500 all the way to 6500 I picked up 30+ hp, I also picked up 43 hp at the peak of 5700, the car was more controllable, more streetable and there was a definite difference going down the track, for the first time in years I was driving my car to the track an out for more street nights. yes the initial cost was a little pricey, but my car went fomr getting like 8 mpg on the street to about 19mpg. As far as cam choices with S/D, convert to a MAF and run what cam you want to run, or you can run one of the Comp Cams Extrem Energy cams like the xe270hr

just for reference, there are two xe270hr cams, you would wan tthe one with 114 degree lobe sep angle. Comp also has a cam help number at 1800-999-0853