Better gas milage on f40

Discussion in '40- & 55-Series Tech' started by illegal_smile, Jul 22, 2005.

  1. illegal_smile

    illegal_smile

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    Hi all, i'm looking to buy a mid 70s FJ40, right now i'm seeing between 10-15mpg on these. I'm also a novice to this sort of thing, but how could i increase that and still maintain power/offroadability? Thanks!
     
  2. zebrabeefj40

    zebrabeefj40

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    You don't drive the FJ40. :D The figures you quote are pretty much what you're going to get.

    Nick
     
  3. Plowboy

    Plowboy

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    Diesel and gears
     
  4. Tigerstripe40

    Tigerstripe40

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    10-15 is a pretty big jump.

    I average 14-16 w/ 2F SM420/4.11's and 35's.
    Timing and carbureation are key.

    Theres lots you can do to improve it.

    SEARCH.
     
  5. dfmorse

    dfmorse

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    I get around14-17 with a 1979 mostly stock FJ40. A Jacobs electronic ignition will help, but not much. Champion spark plugs will help a little. Timing will help a lot. Actually, the year of the FJ40 is important too. Some of the older FJ40's got fair mpg. I've never heard of a stock cruiser of any model get much over 19 mpg...
     
  6. ken_79-fj40

    ken_79-fj40

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    Short of diesels, I've never heard of a cruiser getting better than 20mpg. You can do what I do. Drive it once or twice a week and drive something else the rest of the time.
     
  7. IDave

    IDave

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    I get 15-17 with a stock points/carb non-USA system on both of my rigs. Up to 18.5 under ideal driving conditions and with AT rather than MT tires. 10 mpg is probably a bad tuneup, smog stuff, and a heavy right foot.
     
  8. Pin_Head

    Pin_Head

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    I get more than 25 MPG in an FJ40 with a stock 2F with 35s.





















    But that is only going down grade with the engine off (Mexican overdrive). :flipoff2:
    Otherwise I get 12-13 MPG.
    YMMV, but not much.
    If the mileage bugs you, get a beater Honda Civic for DD.
     
  9. LandCruiserPhil

    LandCruiserPhil Peter Pan Syndrome Supporting Vendor

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    Put in a V8
     
  10. PabloCruise

    PabloCruise SILVER Star

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    When you get your 40, tune it up!

    My mileage went up (at the same time going from stock rubber to 33x12.50) to 13-15 after I got the carb and dizzy rebuilt by Jim C.
     
  11. chief

    chief

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    Put in a nice mild cammed, Quadrajet carbureted small block Chev and keep your foot out of it. That's not as much fun but you have to choose
     
  12. FJ40onNOS

    FJ40onNOS

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    i was getting about 12MPG, i had a Weber 38, header, 3.73 gears and 33in tires.

    my motor only lasted me 17,000 miles, so now its rebuild time.

    i am planning on running a MAF RV Cam, the Weber, header, try to have the head wet flowwed, ported and polished, and some bigger intake and exhuast valves. i still need to check on prices of it all, so once im all done and back on the road ill post my new MPG
     
  13. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    Port and polish and the bigger valves is a waste of time.
     
  14. red66toy

    red66toy dorkus malorkus GOLD Star

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    I get about 15-18mpg on the highway. Not bad for a 40 year old motor. :)
     
  15. Rice

    Rice

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    TRUTH!
     
  16. FJ40onNOS

    FJ40onNOS

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    ok thanks mace
     
  17. JP_FJ40

    JP_FJ40

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    i just ran up to Portland, ME on saturday with my newly de-smogged, headered and tuned 2F and did the 110 miles on 8 gallons. that's 13.75 mpg.

    not too bad, and there was a bit of ping in it when i was pushing into it on the upgrade. i was told my non-USA carb has a bit of a vacuum leak at the throttle shaft where it passes through the carb body. apparently it has worn over time, (15 years) and that it is irrepairable.

    does this sound like a legit issue? i'm thinking i may buy a new carb during the SOR holiday sale.
     
  18. Morse_FJ40

    Morse_FJ40

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    Mace, I would have to disagree with you on that statement about port and polishing. The valves might not help, but gasket matching and polishing the head would make a huge difference. The thing would flow much better!!! Less resistance since the air chambers had been polished.

    later

    Ryan
     
  19. trekker

    trekker

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  20. FJ40onNOS

    FJ40onNOS

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    well, im going to check on the cost and thinking about it.
     
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