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mitsubishi governor

Discussion in 'Mitsubishi Minicab' started by auburn17, Dec 29, 2009.

  1. auburn17

    auburn17 New Member

    Hey, I am new to the mini truck scene, I just purchased a 1990 Mitsubishi Minicab. I have broswed around on here about removing governors, but have not found anything that pertains to me (or that I can tell). When I shift into fourth gear the "governor" kicks in and will not let the truck run to its full potential. If anyone can help expalin, in detail, how to remove this I would greatly appreciate it.

    PS: I have looked for the "box" attached to the odometer cable, and there is not one.
     
  2. 93mit

    93mit Member

    PM Dan. He can explain any questions you have, after you have done a search, Dan is the man on the Mits.
     
  3. Mitsubishi Speed Limiter

    All Japanese vehicles have an internal speed limiter that is determined by vehicle class. K Series vehicles in the 80’ to early 90’s were set to either 100 or 115+-5 depending on year of manufacturer. Delivery vehicles were sometimes set to 85 kilometers for safety reasons. On Mitsubishi there is also a RPM engine over speed sensor which runs of the centrifugal magnetic field produced by the input head of the speedometer cable connection at the back of the speedometer. When over speed is reached a buzzer notifies the driver and at the same time limits the vehicle speed. Being this is irritating at best most people remove the small capacitor sized unit and deal with the speed issue by removing the speedometer cable and plugging in an aftermarket unit. This trick will not work with computer controlled vehicles. On the back of the unit looking at the circuit diagram you will see two screws to the right of the input connection of the cable. To the right of the screws is a illumination bulb. The top screw is (1) and the lower screw is (2). If you don’t have a tach then you will see three screws and the 2 & third are 1 & 2. Adjusting or fooling the tach to a lower RPM is one way to increase your top speed. For safety reasons can not recommend this approach so therfor can not tell you wich way to turn the screws…LOL.

    Cheers,
    Don
     
  4. 93mit

    93mit Member

    Don, sorry if I was steering auburn wrong, but I was assuming that his truck was one of the trucks that was gov. to 25 mph. My apologies.
     
  5. slimbad

    slimbad Member

    93mit, auburn stated that when he shifted into 4th gear the governor kicked in. Donald states that the kei vehicles are generally governed to 100-105kph. As its highly unlikely that auburn is shifting out of 3rd into 4th at 100kph (the spd that JDM are governed to) it's more likely he has a LHD.

    So in essence both you and Donald are correct. Donald's info is in regards to JDM kei's. And you were correctly referring auburn to the LHD guru Dan.

    And besides all that auburn said he had a LHD:D - post #4 in following thread:

    http://www.minitrucktalk.com/showthread.php?t=6320

    Happy New Year and...........later, slim
     
  6. auburn17

    auburn17 New Member

    Hey, thanks for all of your input. I should have given you more info. Yes my truck is a LHD. 3cyl, 4wd, 4-speed. However, I am not even coming close to reaching 100km/h. I am able to run 60km/h on flat ground in 3rd gear, the problem is that when I shift into 4h gear the truck usually slows down to 55km/h and will not reach any higher speed once in 4th gear.
     
  7. auburn17

    auburn17 New Member

    Sorry guys the post prior to this is incorrect. My truck IS NOT a LHD, it is RHD
     
  8. Sounds like your clutch is slipping and you are loosing speed, not a limiter issue. If a limiter or govenor is a propblem you would get the same effect at the same speed everytime.

    Br,
    Don
     
  9. auburn17

    auburn17 New Member

    wouldn't it be slipping in other gears as well? This only happens in 4th gear. The first 3 gears are perfect.
     
  10. Clutches are first noticed slipping at top end speed do to the vehicle trying to maintain Kentic energy momentum and at the same time fighting aerodynamic drag forces. You mentioned you are driving on a flat surface and by seeing your location in Florida at sea level. On the other hand vehicles that slip at lower speeds most likely will never make it up to 3rd or higher gears. Clutch slippage works in reverse, higher gears fail (slip) first. If you have a tachometer equipped vehicle when you shift into 4th the RPM will continue to climb but the vehicle speed will not increase. If the vehicle speed drops and the RPM drops when you put it in high gear you have a separate issue. One, the timing could be off. Two, your engine compression could be off. Hook up a compression gage and go for an across the board +-3kgm.cm2 difference. If over that you may need to replace the rings.

    Cheers,
    Don
     
  11. Aaron Burke

    Aaron Burke New Member

    FAA068DD-18B2-4D27-86FC-9E952964AB62.jpeg BF1C6678-0535-4F33-AAF2-B17E9C48DB99.jpeg A86E7D1B-9F57-4EB3-88ED-D8A55FCDF4EF.jpeg
     
    Fhsoj likes this.
  12. Fhsoj

    Fhsoj New Member

    ordered the 78 pinto icm from rock auto, about $25 shipped, wired it in and rev limiter gone! This is on a 87 u14t Lefty, the colors of my distributor + and minus were red and Green on terminals 1 and 2. Red goes to purple wire green to Orange.
     
  13. Grant Peterson

    Grant Peterson New Member

    i tried this on a 90 u15t left and drive. it started but had my timing so out of wack . not sure what would of caused that
     
    Dan likes this.
  14. Dan

    Dan Member


    The ignitors in the 90's leftys had a 30 or so degree offset built in to the ignition. I got past it with an adjustable ignitor once and another time or two by using a generic icu, flipping the distributor 180 and movi g the plug wires one terminal over. To get the 8ish degrees of advance I rotated to the tail end of the lockdown slot and was able to barely grab the housing.
     
    Last edited: Feb 20, 2024

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