Turbo 400 governor modification

Discussion in 'The "Juice Box"' started by Canadian GS 350, Mar 31, 2020.

  1. Canadian GS 350

    Canadian GS 350 Well-Known Member

    can someone post a few pictures of how you lightened the weights in the governor? And tools used? And how you replaced the pins? Much appreciated.
    I’m going to use the Tri Shield BB formula from previous posts.
     
  2. johnriv67

    johnriv67 Well-Known Member

    #6 finishing nails work great to hold the finished weights in place
     
  3. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Any particular length, or does a number 6 only come in one length? Thanks
     
  4. johnriv67

    johnriv67 Well-Known Member

    It only comes in one length
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    An article by Gary Paine,
    GovernorArticle.jpg

    I used the B&M shift point modification kit. A lot more expensive to do it that way, but every change is reversible. I still advise you to play with a spare governor in case you go too far.

    https://www.summitracing.com/parts/bmm-20248
     
    BUQUICK likes this.
  6. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Thanks Larry, I do have a spare governor. Now I have a much better idea how to grind down the weights.
     
  7. scubasteve455

    scubasteve455 Well-Known Member

    Please keep us on the up and up. Canada. Step by step. Still learning about the weights. Thanks
     
  8. BRUCE ROE

    BRUCE ROE Well-Known Member

    I get a spare gov to experiment with, keep the original. I ordered a box
    of rather long, skinny cotter pins to hold the weights. Keep good notes
    of results, which take some driving to collect. Bruce Roe
     
  9. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Thanks Bruce
     
  10. BRUCE ROE

    BRUCE ROE Well-Known Member

    The cotter pin I use (one or two times) is 3/32 dia 1.75 long inches, McMaster
    Carr 98338A155 $5 for 100. The usual spring/weight kit is used here, but I
    usually manage to finish with the original kit parts back in the box for the next
    project, modified/ground OEM parts in the car.

    Here are the 6 weights in the kit, with 12 dif strength springs sorted out. The
    1/4 in rod is so I can push 2 springs together to compare, with no danger of
    them flying off to oblivion. good luck, Bruce Roe GovmodKit.JPG
     
  11. Canadian GS 350

    Canadian GS 350 Well-Known Member

    47EB2C5D-49EC-4DFF-AAD1-388765CE0D86.jpeg 43F491FD-91F4-47A1-B30F-2485158E8492.jpeg 8B36BD53-A2D1-4450-AF74-5928BBEB52E7.jpeg Thanks Bruce. Here are pics of my governor - it came with the tranni - 1970 Pontiac 455....assume a full size car. I’m going to weigh the weights before doing anything.
     
  12. Canadian GS 350

    Canadian GS 350 Well-Known Member

    The turbo 400 currently upshifts to second too soon, into 3rd by 25 mph.
    The adjustable modulator is all the way in....with one more possible turn of adjustment left. What I’ve read, very little change if I were to turn screw in the last turn.
    The governor will be my next focus , as I’m sure it needs some mods.
     
  13. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    The modulator doesn't affect WOT shifts, just minimum and part throttle shift points, and the adjustment range is small. The governor is what you must adjust. One more thing, your electric kickdown must be hooked up and functional. If it isn't, that alone will make it short shift at WOT.
     
  14. Canadian GS 350

    Canadian GS 350 Well-Known Member

    Larry - I have the kick down working. Or it appears work. I can here it clicking in the tranni. Car appears to be down shifting when accelerator pushed to the floor. I’d be happy for now to obtain 4800 rpm shifts from 1-2, 2-3 on this stock 350 engine. The 455 will require further mods down the road. Thanks
     
  15. Canadian GS 350

    Canadian GS 350 Well-Known Member

    9FE3DE84-613B-4EDC-A5A3-1923AA6DCBC7.jpeg Here we go!
     
    johnriv67 likes this.
  16. Bigpig455

    Bigpig455 Fastest of the slow....

    Look for my old thread on this topic, and it talks about how to weigh the weights. Overall weight is a bad indicator of how it will affect shifts, you really need to know nose weight.. I'd throw up the link but I can never find it....the thread does have a "recipe" for a 5300 RPM governor, you could back it off a little for 4800
     
  17. Canadian GS 350

    Canadian GS 350 Well-Known Member

    1029DA27-B053-4B8A-A7FB-B33755FB83F6.jpeg 57BF11AF-9B5B-41D3-BBE5-96EAE1FC2511.jpeg 61863A4F-B829-423A-8F77-15745874C53A.jpeg I will do that. Thanks for the help.
     
  18. johnriv67

    johnriv67 Well-Known Member

    I followed Rhett's nose weight guide a year ago, and it worked pretty well.
     
  19. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

  20. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    That's because it isn't your thread Rhett although you did contribute to it a lot. I managed to find it though. David Butts started the thread.

    http://www.v8buick.com/index.php?threads/governor-info.207490/
     

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