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Old 01-06-2011, 04:22 PM   #1
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Calling all Mustang 6 packers!

Ok, here's the situation: I have come into possession of a 1986 Mustang convertible with a 3.8 and a 3 speed automatic. I have an '83 Mustang with a 5.0 and a 5 speed for a toy. (what can I say...I likes the old ones!) I have a Jeep Wrangler, but it gets very little in the way of gas mileage. That's where this car comes in. What can I do to maximize the gas mileage? Mechanic wise, I can turn a wrench. I have most tools needed, but I haven't dealt much with fuel injection. I know the 3.8's from that era were notorious for blowing head gaskets and the fuel injection was barely adequate. I have an 8.8 axle with 2.73 gears. I have a T-5 tranny out of a T-Bird Turbo coupe, which has a steep first gear. That way, I get decent acceleration from the stop light and keep the highway gear. I have a bell housing, clutch assembly, divider plate and starter from a '94 Mustang 3.8. Now comes the hard part: What to do with the 3.8? Reliability is very important to me and I don't mind spending the $ to make it right. I was thinking about swapping out the 3.8 for a '99 or newer 3.8. Has anybody done this? I know I would have to use the wiring harness and computer out of the donor vehicle. How hard would this be? Or do you have any other engine suggestions? How about exhaust? I like the GT tailpipes for that year. I have heard that you want to keep the exhaust pipe to a 2 1/4 diameter. For gas mileage, which is the better header, long tube, short tube, factory or? All help is appreciated. Thanks!
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Old 01-06-2011, 04:31 PM   #2
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Re: Calling all Mustang 6 packers!

94-98 vs 99-04 the fuel return systems differ~ thats one issue
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Old 01-06-2011, 10:11 PM   #3
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Re: Calling all Mustang 6 packers!

make sure you have full exhaust and n ot turn down because it will make you lose rear end down force and lose gas milage
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Old 01-11-2011, 12:05 AM   #4
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Re: Calling all Mustang 6 packers!

Quote:
Originally Posted by ponyboy94 View Post
make sure you have full exhaust and n ot turn down because it will make you lose rear end down force and lose gas milage
im not tryn to be a smartass, but how r turn downs goin to make a car lose downforce?
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Old 01-11-2011, 02:44 AM   #5
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Re: Calling all Mustang 6 packers!

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Originally Posted by svtlx View Post
im not tryn to be a smartass, but how r turn downs goin to make a car lose downforce?
It won't.




But in the case of switching motors you can use your wire harness and ecm. You have to put all the sensors from your motor on the newer one and you will need either a smaller fuel pump"less pressure" or hook up a fuel return with an aftermarket fuel regulator. If you do not do this it will run rich as hell and possibly blow an injector or two.

I'm in the proscess of doing something like you want to do but its on a 92 taurus with a 3.8L. I've got a 01 mustang top end on it, and having trouble with it running rich but I don't have an adjustable fuel regulator on it and it has 70psi at the fuel rail contantly.
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