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Thread: My 4d55 performance build

  1. #51

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    Heck yeah! Let me know man and I could get me some gears!

    If you think that would be miserable, think of what its like now. I have stock gearing from a gas motor truck on 33's. I don't know what stock gearing is but its horrible! I can run 70mph in 4th before even thinking of shifting to 5th!!
    Last edited by vanderchevy18; 10-03-2011 at 03:46 PM.

  2. #52

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    The 4:30's are the stock gears with the manual tranny. Auto's came with 4.44's.

  3. #53

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    Finally got some parts in for my new turbo setup!


  4. #54

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    Quote Originally Posted by cdalejef View Post
    The 4:30's are the stock gears with the manual tranny. Auto's came with 4.44's.
    You're gonna want the 4.44's

  5. #55

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    Its getting there! I'm almost done with the exhaust manifold, intercooler, plumbing, and power steering.


  6. #56

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    To clarify... There was no powersteering either. I had to find a pump and make a bracket.

  7. #57



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    Dude that looks like a tight fit..... Is there enough clearance there when you unload the torque or bang reverse the turbo wont hit?
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  8. #58

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    It's not done yet. It'll be up higher and a tiny bit shorter before its done.

  9. #59

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    What's that intercooler off of?

  10. #60

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    Mercury Cougar Turbo Coupe.

  11. #61

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    max boost attained on my 4D56 is about 0.8 kg/cm2 at WOT....turbo btw is an air-cooled TD04.

  12. #62

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    OK so I finally ordered the last of the parts today since I'll have time to work on it this weekend. Most of the mods I've done have been pretty well free. Either I made it or modified it myself. As for the Turbo stuff, I got everything through Jake at Irate Diesel Performance for I think a really good price. Gotta hand it to him. Who would ever think a shop that specializes in Powerstrokes, would take care of the work and part acquisition for a build like this on such an obscure motor? Not to mention, do it without jacking the price through the roof!

    Heres basically the parts list i got through Irate Diesel Performance. 4 intercooler boots, 8 clamps, 2 new intercooler pipes, new oil feed line, new oil drain line, all the fittings, the custom exhaust manifold flange, manifold pipes, turbo inlet and outlet fittings, T3 flange, turbine outlet flange and clamp, 4 new glow plugs, intercooler, and a T3/T4 hybrid Turbo.

    I'll get more pics and a video up once I get it done this weekend.

  13. #63

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    Oh, and here's what I have so far. Turbo is all mounted. Just waiting on plumbing.




  14. #64



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    Sweet dude....
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  15. #65

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    that's a nice looking build you got there. i don't know much about diesels so this is nice.

  16. #66

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    i'm not sure that i understand the running gear thing you were talking about. is that because of the short powerband that diesels have?

  17. #67

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    Sorry I haven't been on here in a while. Busy busy.

    Here's the finished product!


    It runs very good! The only problem I have is the glow plugs don't work. I had 6v plugs in them and burned them out. I ordered some 12v plugs since its wired to 12v power but they are nowhere near the same! I got 7880 Y-710J plugs. Any ideas?

  18. #68

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    Diesels don't have a short power band. Actually given the rpm range, their power band is much longer than a gas motor. Its because the gearing is taller than normal, the tires are much bigger than normal, and its a relatively heavier vehicle. Its coping better with the extra power, but 75mph in 4th without the engine screaming is a bit too high geared.

  19. #69



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    I think there is a thread with part numbers for the conversion. Otherwise you will need a dropping resistor. How about a video of it running and driving?
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  20. #70

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    I did use the number from a thread on here. 7880 something. Here's a pic of the two plugs.

  21. #71

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    They're both the same except for the threads. I can screw the new ones in just fine, but I don't think they screw in near far enough to hold without blowing out. I can only get them in about halfway before it seats.

  22. #72

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    Quote Originally Posted by vanderchevy18 View Post
    Sorry I haven't been on here in a while. Busy busy.

    Here's the finished product!


    ?
    What intercooler is that?

  23. #73

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    Out of a cougar Turbo coupe.

  24. #74

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    now, this is something that i don't understand. why do you need such short running gears. my truck has 4.222' gears and i can start in second gear with my 33's on and am shifting into 5th by 50-55mph. i could also do this when the motor was stock as well. i understand that the diesels are a little heavier but my truck weighs just shy of 3600 pounds without me in it. how much heavier are the diesels than the gas trucks? is it that the transmission gears are different ratio's than the km-145 transmission or something else. my buddy has an older toyota hilux 4-door with the stock 2.2 Liter non-turbo diesel motor and he ran 38's on his and only recently went to a lower running gear from the stock 4.111's cause he went to 44 inch tires. now he only runs 4.56 gears. my buddy has had the same clutch in his truck for five years now and has not had a problem. his clutch is a centerforce if that makes a difference.

  25. #75

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    maybe this could be of help vanderchevy. i'm using kitahara HKT PM-75 replacement glow plugs on my motor. you may want to take a look at the crosses on this part number. hth

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