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Thread: Boost Pressure in M939A2?

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    2 Star General Mos68x's Avatar
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    Default Boost Pressure in M939A2?

    Does anyone who has a boost gauge in their truck know what the peak boost pressure is? I need to know so that I can size the water/methanol injection nozzles properly.

    I cannot drive my truck until I get the w/m injection system in it since I built a replacement intake manifold and got rid of the aftercooler. I want better control over my EGTs, and a cooler intake charge. Instead of having a controller that is sketchy I’ll be running mine off of a Teensy microcontroller (more powerful version of an arduino). I’ll run two water circuits for injection, 1 for pre-turbo injection for wet compression and it will be based on rpm and boost, and it will only be for replacing the aftercooler or an intercooler. The second circuit will be post-turbo, and it will be based only on exhaust gas temps. The whole purpose of this is to get better control over EGTs, not to gain any HP or Tq, but it would be nice.
    SGT USA RET
    3/101 & 1/101 Ft Campbell, KY
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    MOS's 68X>15X>15Y20 AH-64 Attack Helicopter Weapons and Electronics Systems Technician
    Yes, I was deployed to war multiple times so please don't ask

    1992 BMY M934A2 frame with 927/928 cargo bed "Sur Móvil"

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    I have a modest tune. 150ml delivery to 180ml. Cross math comes out to 285HP. Larger muffler, K&N air filter and a lot less piping.
    I drive my gauges and see 32 pounds with foot buried in the floor.

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    2 Star General Mos68x's Avatar
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    Quote Originally Posted by FullSpecial View Post
    I have a modest tune. 150ml delivery to 180ml. Cross math comes out to 285HP. Larger muffler, K&N air filter and a lot less piping.
    I drive my gauges and see 32 pounds with foot buried in the floor.
    Thanks! Any upgrades to the engine? Like new valve springs or head studs? Happen to know your EGTs when you run at 32# boost?
    SGT USA RET
    3/101 & 1/101 Ft Campbell, KY
    AUG 2000 to JUL 2011
    MOS's 68X>15X>15Y20 AH-64 Attack Helicopter Weapons and Electronics Systems Technician
    Yes, I was deployed to war multiple times so please don't ask

    1992 BMY M934A2 frame with 927/928 cargo bed "Sur Móvil"

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    Quote Originally Posted by Mos68x View Post
    Thanks! Any upgrades to the engine? Like new valve springs or head studs? Happen to know your EGTs when you run at 32# boost?
    We saw 26lbs on Profos camper all the way to California. It is intercooled though. Max of 1200 degrees no matter how big the hill. That was at around 50,000lbs
    2008 F-250 6.4L Powerstroke
    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, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
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    Quote Originally Posted by simp5782 View Post
    We saw 26lbs on Profos camper all the way to California. It is intercooled though. Max of 1200 degrees no matter how big the hill. That was at around 50,000lbs
    Thanks Wes! That is quite hot for EGTs, I’m hoping to keep mine maxed at 800-900, but we shall see what will happen. But at least with this info I can properly size my nozzles. It will still be a guessing game with nozzles to a degree since I’ll have two separate water circuits, but at least this will help with a total size.
    SGT USA RET
    3/101 & 1/101 Ft Campbell, KY
    AUG 2000 to JUL 2011
    MOS's 68X>15X>15Y20 AH-64 Attack Helicopter Weapons and Electronics Systems Technician
    Yes, I was deployed to war multiple times so please don't ask

    1992 BMY M934A2 frame with 927/928 cargo bed "Sur Móvil"

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    2 Star General Mos68x's Avatar
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    I just sent an email to Snow Performance with some info looking for a better idea for nozzle selection, right now I’m thinking of a single 100-175ml nozzle for pre-turbo, and then twin 100 nozzles post-turbo.
    SGT USA RET
    3/101 & 1/101 Ft Campbell, KY
    AUG 2000 to JUL 2011
    MOS's 68X>15X>15Y20 AH-64 Attack Helicopter Weapons and Electronics Systems Technician
    Yes, I was deployed to war multiple times so please don't ask

    1992 BMY M934A2 frame with 927/928 cargo bed "Sur Móvil"

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    I have my truck set at 26psi right now. I have had it as high at 36psi but it doesn't really make more power, just heat. Where is your air compressor going to pull its air from? You'll need to move it from the head, to before your 1st water injector.
    M931A2
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    Quote Originally Posted by Mos68x View Post
    Thanks Wes! That is quite hot for EGTs, I’m hoping to keep mine maxed at 800-900, but we shall see what will happen. But at least with this info I can properly size my nozzles. It will still be a guessing game with nozzles to a degree since I’ll have two separate water circuits, but at least this will help with a total size.
    That is with a stock H1E turbo. An HX50 will do you alot better. Intercooler will as well. You do not need water injection. Bad things happen with that. 6CTA maxes out in the 1250 egt range.
    2008 F-250 6.4L Powerstroke
    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, Oshkosh 55000 Transfer Case, 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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    I see somewhere between 30 and 35 on my A2

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    2 Star General Mos68x's Avatar
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    Quote Originally Posted by MAdams View Post
    I have my truck set at 26psi right now. I have had it as high at 36psi but it doesn't really make more power, just heat. Where is your air compressor going to pull its air from? You'll need to move it from the head, to before your 1st water injector.
    Crap, I forgot about that! Thanks for reminding me
    SGT USA RET
    3/101 & 1/101 Ft Campbell, KY
    AUG 2000 to JUL 2011
    MOS's 68X>15X>15Y20 AH-64 Attack Helicopter Weapons and Electronics Systems Technician
    Yes, I was deployed to war multiple times so please don't ask

    1992 BMY M934A2 frame with 927/928 cargo bed "Sur Móvil"

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