Torque converters

Discussion in 'Big Block Cadillacs' started by 5one9, Nov 30, 2019.

  1. 5one9

    5one9 Active Member

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    what torque converter are you all using with your combos? What converters will handle drag strip abuse in a heavy car while providing some reasonable amount of stall?
     
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  2. 2JvLo

    2JvLo Member

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    I was wondering exactly the same!
     
  3. 48Austin

    48Austin Safty First! Then pull the trigger!

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    Was wondering the same thing. But with a REALLY light car.
     
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  4. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    Not advocating any particular Mfg., but they all seem to have a formula for engine HP/Torque-Car weight_ desired stall speed.
    OI have successfully used TCI, B&M, and now have one my transmission man keeps secret that gives me just about 3100 RPM with a 5000 pound car and about 650lb./ft of torque
    Greg Surfas
     
  5. 5one9

    5one9 Active Member

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    My current setup is a TH400 with a 2000rpm 12” TCI. I am building another TH400 now with a better input shaft, intermediate sprag, roller bearing/no-walk bushing rear, and different valve body setup. I just now bought a 2500rpm 11” TCI with anti-balloon plate and a SFI flex plate. We’ll see how it goes. With 3.00 gears I didn’t want any more stall to street drive. The car is light and so torquey at 2000rpm I may end up with 2.75 gears
     
  6. 48Austin

    48Austin Safty First! Then pull the trigger!

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    How light is light? MGD lite or Coors Lite? My car is more toward Coors Lite.
     
  7. 5one9

    5one9 Active Member

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    Not “Sedan Deville” heavy. Under 3400lbs.
     
  8. 5one9

    5one9 Active Member

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    The TCI converter (Christmas present from my wife) turns out to be a 10” diameter. 2400-2600 stall. We’ll see. I hope it is no higher than that.
     
  9. 48Austin

    48Austin Safty First! Then pull the trigger!

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    My car will weigh in at about 23 to 24, I'm guessin. Original factory weight was 22.
     
  10. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    Well,
    I put mine on a "diet" and it is down to a svelte 4900 pounds.
    Greg Surfas
     
  11. 5one9

    5one9 Active Member

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    Dang, and I thought my Magnum SRT8 was heavy at 4250...………………………..and I thought my Malibu was light at 3400. I'm stuck in the middle
     
  12. Cadillac Kid 1

    Cadillac Kid 1 Well-Known Member

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    If I'm running in the 12's you should be in the 10's when everything is sorted out. Of course you will have to have a roll cage, but that's all part of the fun.
    Greg Surfas
     
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  13. 5one9

    5one9 Active Member

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    I am sorting out what I am going to do about a roll cage now. I am building 1-7/8" long tubes this winter to replace the 1-3/4" shorties. I have no idea what it will run.
     
  14. 48Austin

    48Austin Safty First! Then pull the trigger!

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    Best to buy a NHRA new rule book. For tube diameter and wall thickness. Tech guys can be real sticklers at times. They have a hand held x-ray densitometer to check wall thickness. And if the track you are running at is NHRA or IHRA cert. they won't let you run after the first sub 9.99 run without a chassis cert. and pilots license.
     
  15. 5one9

    5one9 Active Member

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    Rules? What? `
     
  16. 5one9

    5one9 Active Member

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    Seriously, I'm just putting enough cage in it to make me feel safer. Probably a 6pt. It will be the beginning of a 'legal' cage in case I do decide to upgrade later. The track I'll be at is 1/8th mile and has about zero rules.

    My intent at this point is to run a minimum of 250hp N2O this spring at the Midnight Madness events. I'd like to see some high 5 second passes.
     
  17. 48Austin

    48Austin Safty First! Then pull the trigger!

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    Rules? I agree! But my three closest tracks-RTE. 66, Byron, Union Grove. So I'm done. RULE BOOK! %(^&$%#*^#*#*!!! Don't know about Lyons, Indiana.
     
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  18. PJ McCoy

    PJ McCoy Well-Known Member

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    I have a Hughes BOP 2600 stall. With 3.42 rear gear. I cruise at 55 mph at 2800 rpm or so with a 26" tire. I believe the the torque of my motor pulls harder on the stall than what its rated for. At 55mph I smash the gas and the tach jumps to to 3200 before the trans can keep up. (no passing gear switch connected) When the trans downshifted it jumped to to 4200, around there anyway, and shifted at 4800. I was flying. I am not racing my car but I did drive it for spirited fun. Its perfect for me. Well before the mouse ate up my dash harness. Still not fixed. But getting close.
     
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  19. 5one9

    5one9 Active Member

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    Trans is done and in the car. Engine is out now replacing the copper head gaskets which seeped coolant from day one. I purchased Flatout 0.050" rubber coated copper gaskets that are supposed to require no sealer at all. They look good and the coating on them looks like it should work well.
    IMG_3800.jpg IMG_3814.jpg
     
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  20. Caddylackn

    Caddylackn Member

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    Do you have any finished porting pictures? Your intake port is raised, if so how much? What are your final port dimensions?

    thx,
    C-
     

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