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  1. #11
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    Thanks Mr. Haney...I'm like everyone else more power and more fuel mileage, be nice if I could get both..

  2. #12
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    Quote Originally Posted by Sodapop View Post
    Thanks Mr. Haney...I'm like everyone else more power and more fuel mileage, be nice if I could get both..
    With the MBN that's not hard to do with the ECM upgrade.

  3. #13
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    LOL, Im thinking,which normally gets me in trouble..Do the ecm first,then manifold and then turbo..I have an 5.25 hp mbn..does it matter if i use the 6nz or 7c flash..Or just better off getting the stage 1 from pdi..Thanks again Mr Haney

  4. #14
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    Go with the 7CZ 600/2050 flash 5232 trim codes, plug off the waste gate and diconnect the wire harness from the coil behind the fuel filter base. -19/+63 is real agressive, but drivable. DO NOT use the cruise control..... I drive mine and keep the manifold preasure at 36-38psi(will go to 45psi if I let it), pulls like an unchained monster. 47-50 mph up Sherman out of Laramie, WY loaded to 79-80K. 2004 W900L-C-15 MBN-fuel wire-3.55-22.5 pulling a 53' reefer, 5.5 to 5.7 running coast to coast. Mine did not like the 6999 codes(heat up the wazzu).

  5. #15
    Light Load Member Don2WS's Avatar
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    Quote Originally Posted by Mr. Haney View Post
    The differences are the piston crowns........the camshaft.........the injectors, these are the internal differences, the rest is in the electronics and turbo.

    The biggest improvement to a MBN that can be done is to have the ECM flashed to a 6NZ, 7CZ, or a PDI file. The hard part differences don't make that much of a difference. Afterwards you can do some hard part changes that are great for power and fuel economy to the engine as time and money become available.

    Don't be afraid of an MBN..........they can run as good as a 6NZ very easily with the ECM tweaks
    hello Mr Haney my uncle is getting divorced and is selling his entire fleet he offered me a 2003 t800 with an MBN and a 13 speed and 3.55's the truck has 993,557 and was flashed to 550, the stacks tips are caked with soot and when its cold you can actually see the soot flying out the stacks and landing on the hood, the truck runs great and pulls good turbo puts out 33 lbs but the housing is clay red and blackish. He is asking 8000 for it so i think its a deal. What i want to ask you is if the truck is worth dumping money into since its an mbn and i dont want to do the inframe replace turbo water pump and manifold and end up with a truck that runs like an three legged horse. So if you could please pm me and let me know if this engine could have potential thank u=you i appreciate it

  6. #16
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    Quote Originally Posted by Don2WS View Post
    hello Mr Haney my uncle is getting divorced and is selling his entire fleet he offered me a 2003 t800 with an MBN and a 13 speed and 3.55's the truck has 993,557 and was flashed to 550, the stacks tips are caked with soot and when its cold you can actually see the soot flying out the stacks and landing on the hood, the truck runs great and pulls good turbo puts out 33 lbs but the housing is clay red and blackish. He is asking 8000 for it so i think its a deal. What i want to ask you is if the truck is worth dumping money into since its an mbn and i dont want to do the inframe replace turbo water pump and manifold and end up with a truck that runs like an three legged horse. So if you could please pm me and let me know if this engine could have potential thank u=you i appreciate it
    These engines run fine and live long with a 550 file in them. You need to get rid of the stock mufflers and let it breath. The stock mufflers have catalytic converters in them. Also I would look at the turbo and exhaust manifold, as an MBN it may have burnt the center divider out of each of them. The MBN ran very high EGT's and are known to do this with high mileage. The color of the turbo is indicating that it's getting too hot and this could be the reason why. I'd remove the turbo and inspect the manifold and turbine housing before I purchased it to see if it needs these things replaced.

  7. #17
    pbr
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    I have a 03 6nz 550 that runs great. I also have a 03 mbn 525 that has blown 3 head gaskets, is on its third turbo because of cracks and have replaced the exhaust manifold because of a crack. All the pistons and sleeves have been replaced and the engine hasnt turned 500 thousand miles yet. A mechanic at a diesel shop said he could reprogram the computer so it run like my 6nz. The computer now reads that the engine is a 550 but it still indicates that its still a mbn.
    Also, the turbo lag is still there.
    If the computer has been changed, shouldn't it read 6nz and be rid of the turbo lag?









    s

  8. #18
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    Quote Originally Posted by pbr View Post
    I have a 03 6nz 550 that runs great. I also have a 03 mbn 525 that has blown 3 head gaskets, is on its third turbo because of cracks and have replaced the exhaust manifold because of a crack. All the pistons and sleeves have been replaced and the engine hasnt turned 500 thousand miles yet. A mechanic at a diesel shop said he could reprogram the computer so it run like my 6nz. The computer now reads that the engine is a 550 but it still indicates that its still a mbn.
    Also, the turbo lag is still there.
    If the computer has been changed, shouldn't it read 6nz and be rid of the turbo lag?
    The MBN can still have boost issues after the flashing of the ECM with a 6NZ flash file. The 6NZ 550 file should have eliminated the sluggishness of the retarded timing in the MBN file, along with the high EGT's that are damaging the turbine housing and exhaust manifold. With the mulitple head gasket failures, I hope someone has checked both the liner protrusion and that the head bolts are not bottoming out in the cylinder block, both of these things could be causing your problems. CAT produced a number of cylinder blocks that the head bolt holes weren't tapped deep enough for the head bolts in the block this caused the head bolts to tighten with the head bolts running out of thread, instead of the clamping force of the head crushing the head gasket and liners properly at the proper torque.

    When you flash with a 6NZ file, you also eliminate the electronic signal to the wastegate soleniod from the programming. You need to block the wastegate hose off at the turbocharger. The MBN turbocharger has a low pressure wastegate actuator on the turbocharger, if the soleniod is open at the fuel filter base this opens the wastegate actuator at low pressures. Usually around 22-24 psi of boost will be the maximum you'll see if this is happening. The turbochargers on these engines don't last long after modifying the ECM in this manner. I recommend to everyone that I do this type of modification to change the turbo for a high performance BorgWarner turbo within 6 months to a years afterwards, otherwise they may encounter an expensive turbo failure later. I keep the turbos around if you're interested.

    The engine serial number will still show as a MBN in the ECM and not a 6NZ serial number if the mechanic doesn't reprogram it. The only time I'll reprogram the engine serial number is if I'm doing a copy of the existing original ECM for a customer and he wants both ECM's to look alike. I will not change the engine serial number of the original ECM that came with the engine. If you want to know exactly what type of programming that was done, you'll need the Personality Module Part Number inside the ECM listed in the Configuration Files.

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    pbr

  10. #19
    pbr
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    I had my mbn reprogrammed by a mechanic who said it would make it run like my 6nz. The computer now reads that its rated at 550hp like my 6nz but it still shows it to be a mbn engine and still has the agravating turbo lag. Can a computer be changed to 6nz specs and still show it to be a mbn? Also, shouldn't 6nz specs get rid of the turbo lag? Thanks for any help.
    Last edited by pbr; 06.22.2011 at 11.05 AM. Reason:: no longer needed

  11. #20
    pbr
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    Thank you Mr. Haney. When my mbn was reprogrammed I asked for a 550, Australian, Brakesaver package. The truck pulls good and blows smoke but unless it went with a 6nz file Im concerned that Im making a motor thats already too hot even hotter. The truck has no pyro gage. Should I just run it or have something checked out?

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