EFI / MPG question (poll) - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 19 (permalink) Old 03-29-2013, 04:11 PM
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Re: EFI / MPG question (poll)

Originally Posted by turbo2256b View Post
I have built engines for economy and performance. A few even went to sefi to carb and carb to sefi. If everthing is matched up and tuned realy well (the comple engine build) there isnt much difference in economy. One engine ran a victor efi then went dual quads set up by Nickerson, so far the carbs have done better by 2 to 4 mpg.
I'm surprised it's that low. Perhaps the carbs could gain more with proper tuning? The main advantage of running dual quads is better fuel distribution.

'68 Ranchero 500
'70 Cougar XR-7 Convertible
'98 Mustang GT Convertible
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post #17 of 19 (permalink) Old 03-29-2013, 06:34 PM
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Re: EFI / MPG question (poll)

I think I agree with what My427Stang said, and thats basically to tune what you have. It would be a fun challenge, and if strictly saving money is your goal, probably the cheapest way. The other way that I would suggest is to find a wrecked 96-01 Explorer 5.0 2wd (not very common, but they are out there) and use the whole engine and trans. It has good flowing intake and heads (basically 93 Mustang Cobra), small truck cam (good low end power), and a deeper 1st gear than the older AOD for better acceleration and better city mileage. I think you could have a complete engine and trans with harness and computer for $500. With that particular combination I wouldnt try to mix and match too much since the trans is electronic and would require a fairly pricey stand alone computer if you wanted to, say, use a carb instead of the EFI. One potential obstacle is the relocated spark plugs, but for your car special headers are readily available in the $300 range. Im not sure if the 2/4wd transmissions are the same from the tailhousing forward, but if they are that would make finding a suitable candidate much easier.

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post #18 of 19 (permalink) Old 03-29-2013, 09:59 PM
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Re: EFI / MPG question (poll)

Originally Posted by chunger View Post
I'm surprised it's that low. Perhaps the carbs could gain more with proper tuning? The main advantage of running dual quads is better fuel distribution.
It isnt completely tuned yet. Engine is in a 87 Grand marquis with all options, MAP sensor hasnt been hooked up yet, Geared wrong (actualy too high a gear) for the engine build, carbs are not hooked up progressive, HP is around 430, some other tweeks needed, been working on aerodynamics. Other projects have slowed the work down as well as cash. Planning on going with coil packs in the future. So far 24 mpg highway 10 city.

I did do one SEFI verson of the orig engine ported E7 heads, Ho stuff, ported upper and lower lopo intake, different ECM with mass air. Did do 32.9 MPG highway 22ish city 3.55 gears. One day a lifter yoke broke end of that motor.

The dual quad motor blew the 3.55s right out of the cover (in front of Ford dealer) shifting into 2 @ 7200 RPM.

Last edited by turbo2256b; 03-29-2013 at 10:02 PM.
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post #19 of 19 (permalink) Old 03-31-2013, 02:11 PM
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Re: EFI / MPG question (poll)

I;ve been running a Gear Vendor unit (70 C-4/gv) for a few years now & yes, the initial cost is a bit of a chunk (2-2500), but, having a newly built C-4 it didn;t make sense to pull it for an AOD with a questionable past. The GV unit alone got me at least 8-10 mpg better on the hwy anyway. Having 6 gears with the "over" gears up & down is just so much fun & riot on the twisty roads, having the perfect gear at your finger tips to keep the motor in its sweet spot! Adding an aftermarket EFI set up (Retro-Tek EFI with spark control) took me from an original 12-14 mpg to a careful cruise mpg of over 26 mpg, with a high of 33 on a 4 day hwy cruise. Looking at a switch to a 4rwo70 which as you know needs a stand alone box to run it, with,say Baumann controller you can program a couple of different modes, cruise & race & tune your shift points if you want to get into it.
My point being i know i can get 15-1800 for the GV unit + the C-4 so the cost of a Gear Vendor really is neglible
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