gt40 CARB or EFI?

67staaang

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Mar 30, 2005
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sup guys. im thinking of getting a ford gt40 crate engine. what would pull more ponies carb or efi set up? and i was looking at the specs on the b cam and the e cam. which cam would you guys recommend? thanks. for your help.
 
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im ready to put in a 9" with 3.00 but i want 3.55s. i have an aod. would i need a stall converter? and can you give me some knowledge about stall converters and what they do and why to install them? thanks.
 
a higher stall converter will let the engine get in its powerband quicker. Example. Car A has a the stock converter, say 1500 rpm stall, and is fitted with a cam that comes on at 3000 rpm. Punch the throttle, the engine will lag for a moment until it picks up the extra 1500 rpm where the powerband comes in. You have a 1500 rpm difference where the engine will be down on power. Now lets say car A has a the same cam but with a 3000 stall converter. Punch the throttle and whammy, you're right in the powerband, accleration goes through the roof, you're putting more torque to the wheels, in general its just a great experience, LOL. Seriously, a converter makes all the difference in a performance application. Get a converter that stalls at at least the cams minimum rpm range, maybe even higher. If the cam is listed as 2500-6000 rpm, go with at least a 2500 stall, or even better a 3000 rpm stall.

I agree that the FMS cams are getting outdated, however they are still good cams.

Personally, with an AOD, I'd go with 3.70's or 3.89's, a 3000 stall converter with lockup, and a cam with around .520-.530 lift and 225-230ish dur at .050. If you go with a 2500 stall you wouldn't really need the lockup and you'd save some dough, but your holeshot wouldn't be as strong.
 
coo thanks for the info. well the GT40 crate either comes with a B cam or an E cam. ill prolly change cams somewhat in the future. where does the stall converter go? sorry about all the newbie q's thanks for the info.
 
I don't see why a carb would make more HP...

To me the choice really depends on what you want.

True.. you can tune a carb to run almost as well as EFI...but you have to be a tuning wizard and have alot of time on your hands to do it. EFI will provide for better fuel economy as well.

Carbs have the benifit of being cheap and easy. An EFI swap isn't rocket science...but it's a heck of alot harder than bolting on a carb.

I guess I'm biased...I'd go with EFI.
 
I have the quality roadsters mass-flo system-best of both worlds. It gives you vintage looks with fuel injection and the thing just loves to run. Plus the owner Chris Richards will talk you through any technical difficulties you may have. he stayed on the phone with me one night for over an hour just to help me find out that i had a dead EEC which had nothing to do with his system-i had a used computer.
I have one on my 65 AC Cobra replica. Future purchases will be made though for the stang.
www.qualityroadsters.com

Here is a pic of the system on my FFR Cobra replica


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that looks clean. nice nice. i was thinking about putting an upper and lower efi intake from a 91 stang. i have most parts put the harness which is a pain to purchase
 
BottleFed70 said:
An EFI swap isn't rocket science...but it's a heck of alot harder than bolting on a carb.

I guess I'm biased...I'd go with EFI.

+1

EFI can tame your cammed / blown / whatever engine and still make it behave better than a carb consistently could. No reason to think you can't make all the HP you want with EFI (I just made 445rwHP with a blown 306)
 
EFI is not something for an inexperience mechanic to work with. If you aren't up to a LOT of research and careful planing as well as having the ability to do these things yourself then don't go with EFI. If you still consider yourself a beginer then just go with a carb. You can always change over to EFI later and you can always go back to a carb. The carb will be a MUCH easier install. If you want to go with EFI later then you can. If you have any doubts then I think you should wait and when you feel you are ready then go for the EFI. I think you will be glad you waited if you have any doubts.
 
67staaang said:
sup guys. im thinking of getting a ford gt40 crate engine. what would pull more ponies carb or efi set up? and i was looking at the specs on the b cam and the e cam. which cam would you guys recommend? thanks. for your help.
If you go with the B cam, also go with 1.7 rockers to improve the lift specs. I don't agree with the "outdated" label. Most who say that have never run one.:D They're just repeating what someone else has said. I've run it in a 5.0 with both ported E7's and Canfield heads. With the E7's it worked beautifully with a high rise dual plane intake , power was from just above idle to 6500. With the Canfields, it was run with a Vic Jr., power came on at 3000 and pulled to 7500.
 
yeah i know what you mean. ive actually done alot of research in the past 6 months. i think im almost ready but not yet there. couple more months of research. HEY mustangau how many MPG you running now? haha. ..
here is a picture of my beauty...
<a href="http://photobucket.com" target="_blank"><img src="http://i12.photobucket.com/albums/a216/kimhyeyun/IMG_03112.jpg" border="0" alt="Image hosting by Photobucket"></a>
 
There is a reason I doa lot of things on a budget..... I'm still in college. Pain is like the single biggest expeniture when building a car. I wish I had the money to do the paint and body on mine. For now I guess my car can be your car's evil twin (-;