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Thread: Incredible good mileage 1984 Town Car CFI

  1. #21
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    Quote 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

  2. #22
    Lost and driftin' Arquemann's Avatar
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    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"
    2008 BMW 530d Touring, "Femma"

  3. #23
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    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.

  4. #24
    I'm an air-conditioned gypsy gadget73's Avatar
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    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 SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

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

  5. #25
    What a Luxury car should be. mercurygm88's Avatar
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    Quote 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.
    Iíve definitely noticed that. My Ď88 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 Ď02 LSE from the Mark VI it feels like Iím driving a race car.

  6. #26
    GMN Regular DerekTheGreat's Avatar
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    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

  7. #27
    all the CFI are belong to me
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    Quote 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 at 01:04 PM.

    Current driver: 85 Ranger
    Panthers, Parked: 83 GM 2dr POTM 10/2019 | 84 TC POTM 1/2017 & 4/2019 | 85 CS | 86 GM | 88 TC | 91 GM POTM 12/2017
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  8. #28
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    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
    1992 F-150 XLT 4x4, 351W
    1996 Dodge Ram 1500 4x4, 360

    Past: 1995 Crown Victoria Police Interceptor

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