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Thread: Injector Pump Tuning Question

  1. #11
    Sergeant Major Lonnie's Avatar
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    Quote Originally Posted by Floridianson View Post
    I never put a turbo on any of mine. Just found this thread and post #9 talks about plugging a hole in the head if we add a turbo.


    Thanks for info. Those holes are plugged on my engine.
    Last edited by Lonnie; 10-07-2019 at 14:27.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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    Quote Originally Posted by simp5782 View Post
    As soon as you put the throttle down you should get increase in rail pressure. Full throttle being max RP.
    Cruising at 1500/1600rpms you should not have any pressure if you put your foot in it your pressure will vary between the throttle percent. I don't know why you would not have any higher rail pressure.
    I would reflow the injectors. And increase your fuel delivery line. I was running 3/4" hose on my BC.
    The manual transmission on the 809s has huge gaps 3 to 4 and 4 to 5 that are tough to overcome
    I also have low rail pressure at idle & cruise, the pressure only climbs high when I'm at full throttle.... but it only sees about 150 psi at 15-1600 instead of the full 200 psi.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

  3. #13
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by Lonnie View Post
    I also have low rail pressure at idle & cruise, the pressure only climbs high when I'm at full throttle.... but it only sees about 150 psi at 15-1600 instead of the full 200 psi.
    You should have no rail pressure at idle or cruising. A rail pressure gauge is to help with mileage by showing limited or no throttle pressure to maintain the speed while cruising.

    Its like a nagging wife to let you know when you are using too much fuel.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
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    Quote Originally Posted by Lonnie View Post
    I also have low rail pressure at idle & cruise, the pressure only climbs high when I'm at full throttle.... but it only sees about 150 psi at 15-1600 instead of the full 200 psi.
    From what I understand you will never see the 200 psi at 15-1600 rpm. What we don't know is how much performance gain when we drop one lower button size and change full rail pressure. You might have gotten the same amount of power / performance with a 20 button and 185 total rail pressure before drop off. That's with your stock injectors. Yes others have said they could tell the change in the button helped with adding a small amount of psi down lower and increase in total rail. I do believe if you had put a lower range gage on the PT before you changed the button you would have seen a change in the idle pressure. There would have to be some pressure at idle just to push the fuel around the fuel loop system back to the PT. I still believe your good all around right now if all other things are correct. Plenty of air and injectors adjusted. So my .02 be happy or follow the white rabbit to the red or blue pill. Meaning increase / rework injectors for more fuel then might have to deal with the heat so intercooler and what ever else to get where your happy.
    I never expected much from the 250 in any of the trucks not like any of my 400 Cummins that I had or my 400HP series 60 in the 915 I drive now.
    Last edited by Floridianson; 10-07-2019 at 17:37.
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    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Ive got an aftercooler if you are needing one. Its a good take off from a BCIII
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Sergeant Major Lonnie's Avatar
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    Is 200 psi a realistic safe limit on the line pressure?

    I spoke with Pittsburgh Power about getting the injectors flowed.... I would be fine with spending money on injectors if I could drop pressure for more reliability.
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by Lonnie View Post
    Is 200 psi a realistic safe limit on the line pressure?

    I spoke with Pittsburgh Power about getting the injectors flowed.... I would be fine with spending money on injectors if I could drop pressure for more reliability.

    Premco is around $75 an injector for top stops. Which you probably do not have top stops.

    I wouldnt trust pittsburgh power to touch crap to be honest.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

  8. #18
    Sergeant Major Lonnie's Avatar
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    Thanks... good to know. I thought they had a good reputation with these engines?
    1972 AM General, Turbocharged M818 w/ Deuce Bed & 16.00's

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