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Thread: how to turn up fuel...in pictures?

  1. #41
    2 Star General nhdiesel's Avatar
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    This is the one I have...pic from TM 9-2910-226-34, page 3-105:

    pump.JPG

    Pics of my actual pump are on page 1 of this thread (sorry for jacking it maddawg308! But its in keeping with your pump thread)

    Tell me something...I know all pumps are different, and I just want to eliminate the simple before going too deep. I know the filters were replaced not all that long ago, maybe 1500 miles. The truck has been exactly like this the whole time I owned it, which is aprox. 1300 miles. Part of me wants to swap out the filters anyway, but I don't see where it can be a filter issue. I'm obviously getting fuel, as there is smoke. And the boost is low, pointing to a pump or turbo issue.

    Jim
    Last edited by nhdiesel; 06-08-2010 at 21:03.
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

  2. #42
    4 Star General Billy Bobbed's Avatar
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    nhdiesel what turbo do you run C or D.

  3. #43
    2 Star General nhdiesel's Avatar
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    I have the D turbo.

    Jim
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

  4. #44
    4 Star General jimk's Avatar
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    That might be the LDS 465-1 troubleshooting manual which states 18-20Hg art 2400RPM (~9-10ps) and 8-10" Hg at 1600RPM(~4-5psi). See page 34. It would seem that another 200RPM (2600rpm) would create about 12psi. I found that if my LD w/D turbo set at this level will create excessive EGTs only under heavy towed loads and up hill and at the lower end of the operating range. So it is pretty safe, which would seem how the engineers would have wanted the LDS. Note-less boost at lower RPM means less air, less power and higher EGT.

    I moved the droop screw for more fuel but got very little extra power [at lower rpm]. I did see a bit more smoke down low. There may be little to gain because there is just no air down there. The std LDS turbo has a different, bigger, compressor than the C or D so it may be capable of making more low end. My LD w/D doesn't seem to start building until 7-8 . It is very progressive. If you can see it in the LDS power curve where it is strongest at red line(see below)

    Running 15-16psi at 2600 things got rather hot on flat ground.

    All this fueling will reduce fuel economy but it sure is fun to drive.

    The LDS manual can be downloaded here.
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  5. #45
    4 Star General Billy Bobbed's Avatar
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    Now I have alot of low end torque,it pulls hard now at lower RPMs.When I get to around 2100 on,its not as noticeable on power.It pulls hard in all gears at lower RPMs.

  6. #46
    2 Star General nhdiesel's Avatar
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    Thats all i want is a little low end power. I've driven my father's Deuces and laugh that they have no power (compared to a typical newer diesel truck) but mine has about half the power of his! I need to sell this truck soon, so i just want to make sure its tuned right. It was a LOOONG trip home from Kentucky when I would have to drop to 4th and even 3rd gear for even mild hills. I came over Killington in VT in 2nd gear IIRC. Its better after yesterday's adjustments, but still not right.

    Jim
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

  7. #47
    4 Star General Billy Bobbed's Avatar
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    Quote Originally Posted by nhdiesel View Post
    Thats all i want is a little low end power. I've driven my father's Deuces and laugh that they have no power (compared to a typical newer diesel truck) but mine has about half the power of his! I need to sell this truck soon, so i just want to make sure its tuned right. It was a LOOONG trip home from Kentucky when I would have to drop to 4th and even 3rd gear for even mild hills. I came over Killington in VT in 2nd gear IIRC. Its better after yesterday's adjustments, but still not right.

    Jim
    You might check the fuel pressure.It sounds like a fuel problem.Or turbo

  8. #48
    2 Star General nhdiesel's Avatar
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    I tried adjusting the droop screw today, with no change, I still can't get more than 2psi pressure. I guess I'm going to try changing the turbo with a C turbo.

    Jim
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

  9. #49
    4 Star General Floridianson's Avatar
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    Quote Originally Posted by nhdiesel View Post
    Well I think I found my problem. I hooked up my boost gauge today and took it for a spin, and going uphill I can only get about 6 lbs. of boost, max. From what I saw in another thread, I should be seeing 8.84 to 9.82 psi boost at 1600 rpms. Well at 1600 I'm closer to 4 lbs. or less.

    Now...am I looking at just adjusting the droop screw, or is it a governor issue? I'm thinking droop, because I'm obviously getting fuel now, as i can see smoke while on hills.

    I think the next step is to adjust the droop screw, and I think I'll back off the fuel until I get that corrected. but I'm going to wait until I get a response from someone in case I'm headed the wrong direction here.

    BTW, its a quality gauge I used, Isspro, so it shouldn't be gauge error.

    Jim
    No you are close to factory specs for 1600-2000rpm You could bring it up to 5-6. Not all pumps use the droop screw from what I have seen. They use the smoke cam. To correct a later post the smoke cam can run 40* to 70* on different pumps. Buy lessening the angle you bring the Gov./fuel rod closer to the wedge plate and increase the boost. Guess I need to make a vid on how to get full fuel.
    Some Men tell the truth. Some Men seek the truth. Some Men fear the truth but I pity the man the does not want to know the truth.
    James

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  11. #50
    dumpsterlandingfromorbit! gimpyrobb's Avatar
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    Quote Originally Posted by Floridianson View Post
    Guess I need to make a vid on how to get full fuel.
    Get crackin' cracker!
    Don't worry about the size difference

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