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Incredible good mileage 1984 Town Car CFI

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    #16
    Originally posted by Hillbillycat View Post
    though I´d love to get better mpg, of course.
    SEFI swap, make it breathe better, throw the Thermactor crap into a pond and get like 2.47 gears
    Then again you're driving a BOAT that was designed with a straight edge and cocaine.
    1985 Mercury Grand Marquis LS, "Maisa"
    1995 Chevrolet Caprice Classic STW, "Sally"

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      #17
      honestly I don't really think you'd get much improvement out of multiport on the highway. Around town probably, those long runners make more torque down low.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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        #18
        Originally posted by Arquemann View Post
        SEFI swap, make it breathe better, throw the Thermactor crap into a pond and get like 2.47 gears
        Then again you're driving a BOAT that was designed with a straight edge and cocaine.
        2.26 was an option on '79 panthers (maybe other early years), that's what Grand1 has in his '79 Marquis. Hillbillycat has the same problem as you, he's on the wrong side of the world to just find panther parts like I can in Detroit. Makes swapping to factory options from other years a little harder/more expensive.
        Vic

        ~ 1989 MGM LS Colony Park - Large Marge
        ~ 1998 MGM LS - new DD
        ~ 1991 MGM LS "The Scab"
        ~ 1991 MGM GS "The Ice Car"

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          #19
          Exactly
          BTW Thermactor stuff is longe gone.

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            #20
            Originally posted by VicCrownVic View Post
            2.26 was an option on '79 panthers (maybe other early years), that's what Grand1 has in his '79 Marquis. Hillbillycat has the same problem as you, he's on the wrong side of the world to just find panther parts like I can in Detroit. Makes swapping to factory options from other years a little harder/more expensive.
            The 2.26 was probably only available with the tree speed trans. Would need to swap that tall thing in if a fella wanted it, for some unbeknownst reason. Another thing to keep in mind is that just because you made the engine turn slower at a given speed, doesn't mean it'll also use less fuel. Ever try riding a bike up hill in a high gear? Legs going slow, but holy hell what a sweat.
            1985 LTD Crown Victoria - SOLD
            1988 Town Car Signature - Current Party Barge

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              #21
              Originally posted by DerekTheGreat View Post
              Ever try riding a bike up hill in a high gear? Legs going slow, but holy hell what a sweat.
              Very good point! Its all about the powerband of the engine, and where you are in it.
              1987 CV LX 5.0

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                #22
                On bigger hills my 3.08 geared CFI drops to 3rd gear. I doubt a LoPo would need 2nd even with 2.26 gears on hills at highway speeds.
                Tall gears just give more potential for maximum MPG. If my CFI LoPo is a dog of the line, the taller gears must be real fun!
                1985 Mercury Grand Marquis LS, "Maisa"
                1995 Chevrolet Caprice Classic STW, "Sally"

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                  #23
                  My first 90mgm, I put together a gt40p head, stock bottom end, HO cam/upper/TB, Systemax1 lower, 19lb w/ lsc ecm, AND.... 4.10's... It got 20mpg @ 70 if I wasn't pedal happy. Sounded awesome singing along at like 3krpm. Had a small idle surge, but it ran like a raped ape when you got into it, and got single digit mpg.

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                    #24
                    consider a 2.26 with a 3 speed is pretty much the same as a 2.73 with an AOD in terms of RPM. You get much better acceleration from the 2.73 though, so in-town driving is probably more efficient than with some overly tall gears.
                    86 Lincoln Town Car (Galactica).
                    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                    91 Lincoln Mark VII LSC grandpa spec white and cranberry

                    1984 Lincoln Continental TurboDiesel - rolls coal

                    Originally posted by phayzer5
                    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                    Comment


                      #25
                      Originally posted by gadget73 View Post
                      honestly I don't really think you'd get much improvement out of multiport on the highway. Around town probably, those long runners make more torque down low.
                      I’ve definitely noticed that. My ‘88 MGM stock had low end torque you could feel. The Mark VI with CFI not so much. You can floor it from 25mph and it just makes noise and slowly advances.

                      The SEFI panthers may not have much power but they at least feel way faster than a CFI car. The real big difference is going to the ‘02 LSE from the Mark VI it feels like I’m driving a race car.
                      2002 Mercury Grand Marquis LSE, Sylvania Zevo LED Headlights, MSD Blaster Coils, K&N Cold Air Intake, Dual Exhaust, 3.27's - Dally Driver

                      1983 Lincoln Continental Mark VI, Smog Delete - Summer Cruiser


                      ​

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                        #26
                        I do recall feeling the better grunt off the line with SEFI vs my CFI car I had. But, once you get going, they're about the same. Kishy and I raced and were neck at neck, his '84 vs my '88.

                        I also do not think the SEFI 302 makes enough steam for 2.26's. You might notice an improvement between 50-60mph, but I'd wager it would be marginal at best, and negated by the significant loss of MPG in town. When I "upgrade" my 305 TBI Fireturd to 3.23's over 2.73's, mileage in town as well as stop light to stop light driveability feel went up. Could definitely tell it wasn't working as hard to get up to 45. Highway MPG dropped from like 24 to 21/22.
                        1985 LTD Crown Victoria - SOLD
                        1988 Town Car Signature - Current Party Barge

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                          #27
                          Originally posted by mercurygm88 View Post
                          I’ve definitely noticed that. My ‘88 MGM stock had low end torque you could feel. The Mark VI with CFI not so much. You can floor it from 25mph and it just makes noise and slowly advances.

                          The SEFI panthers may not have much power but they at least feel way faster than a CFI car. The real big difference is going to the ‘02 LSE from the Mark VI it feels like I’m driving a race car.
                          I think that's more of a heads thing, than an injection system thing. Mark VIs all have worse heads than 85 CFI cars - I am not sure about 84s.

                          My 84 with 3.08 in the back has no issue getting off the line quickly. Same with my 85.

                          It is also worth noting that the CFI system between 83 and 84 is not even really the same animal. EEC-III vs EEC-IV. The 84-85 CFI system is ran by fundamentally the same computer and code as what runs the SEFI cars. I've only driven one EEC-III CFI car (an 83) and it ran too poorly to give it any consideration here. Neglected car and I had been asked to give thoughts and diagnose.
                          Last edited by kishy; 11-24-2021, 01:04 PM.

                          Current driver: Ranger
                          Panthers: 83 GM 2dr | 84 TC | 85 CS
                          | 88 TC | 91 GM
                          Not Panthers: 85 Ranger | Ranger trailer | 91 Acclaim | 05 Focus
                          Gone: 97 CV | 83 TC | 04 Focus | 86 GM
                          | Junkyards

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                            #28
                            That's not too surprising. I used to get 20 out of my '85 on a trip that's about half freeway and half rural highways. (That same route has since dropped to 14 since the car runs pig rich now and I can't figure out why.)
                            1985 LTD Crown Victoria
                            1977 Oldsmobile Cutlass Supreme
                            1996 Dodge Ram 1500 4x4, 360

                            Past: 1995 Crown Victoria Police Interceptor

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