c15 bridge or accert?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by dieseldan2005, Dec 15, 2009.

  1. dieseldan2005

    dieseldan2005 Light Load Member

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    We are looking at 2 379's. One is an 04 with a c15 475-1750 MBN engine in it, 3.55 rears 13spd. Truck only has 388k on it. Seems really clean. The other ones are old TMC petes. 2007 379 short hoods with 475-1850's, 3.36 rears with 13spd. All the TMC trucks are under 400k. They want $44,900 for the 04 and $55,900 for the 07's. I know the MBN's have some issues. What are the most common and what are the fixes? I have heard new mufflers and a 6NZ ECM. I just know my boss isn't gonna want to screw around with "upgrading" a truck. Should we just skip the 04 MBN or is reflashing it not that costly? Which would be the better overall truck? Thanks
     
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  3. haystack

    haystack Light Load Member

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    IF it were me, I would choose the MBN over the 07's anyday. The biggest turn off for me on the newer trucks, 3.36 rears, I might see that for a triple digit truck with it pushing 700+ hp, IMO.
     
  4. dieseldan2005

    dieseldan2005 Light Load Member

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    So can the MBN's ecm be reflashed to a 6nz program or does it need to be replaced with the 6nz ecm? If it can be reflashed who does it? Will Cat? Also what free flow mufflers are you guys buying? I am having a hard time finding the correct ones. Dynaflex seems like the only ones so far that offer a good sounding free flow muff.
     
  5. Jfaulk99

    Jfaulk99 Road Train Member

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    A few years ago I would have agreed with you. I've got an '06 with 3:36's, 13spd on full size 24.5's and cruses right at 1350rpm at 55 in 12th and 65 in 13th. Right where the acert is supposed to be. I ordered 3:73's but it came in with the 3:36's (Kenworth switched them without asking) and I was mad at first. But after driving it for a while it's not an issue. Keep in mind 6NZ power is around 1500rpm which makes 3:73's perfect for those but the acert is ~1350.

    From what I've read the MBN's ecm can be reflashed however Cat won't do it. There are several people on here that will do it for you, I'm sure they'll chime in. My MBN is an '03 and totally stock except for mufflers. Mines in a W900L and I got on Donaldsons website and found a muffler that was as close in size as the stock under cab converters so all the stock piping and brackets would work. Funny thing when I called the KW dealer with the donaldson part # the guy asked "replacing some converters huh?". Apparently I'm not the first to order those. They're a lot louder than stock obviously but not obnoxious, just really deep and you only notice it with the engine brake.

    Also I have had zero issues with either the MBN or either Acert's I've got. The MBN has around 650k with no issues and the '06 C15 Acert has 350k with just a few sensor issues and a loose VVA wire in the head. The '04 C13 has just under 500k with only a blown bellow between the turbos and one broken manifold bolt.
     
  6. DDS

    DDS Medium Load Member

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    Is the 07 a NXS engine, if so its good, If its an SDP, it will have the DPF.
     
  7. dieseldan2005

    dieseldan2005 Light Load Member

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    I believe the 07 is an NXS engine. I thought they weren't putting DPF's on until the 389's came out in 08? Those also had the larger exhaust from the factory which these 07's don't.
     
  8. Toyman

    Toyman Light Load Member

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    MBN IS JUNK!!!!! That's just my opinion. After fighting it for over a year, I got out of the truck. Check the forum posts for other guys that had problems or spent a bunch of money to get 6NZ results.
     
  9. JPenn

    JPenn Road Train Member

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    As an ex TMC driver I'd pass on the ex TMC trucks, especially if they're DPF-equipped. Likely as not they've been beat on by a succession of novices, they're all twin-turbo ACERTs and at least how TMC set them they're terrible on fuel. That and TMC is rather proud of them and it shows in the asking price.
     
  10. LBZ

    LBZ Road Train Member

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    Found an '04 T600 for sale w/ an MBN C15 & checked the mileage on the ecm, it was 6.66. Maybe they aren't junk, just possessed!:biggrin_2554:
     
  11. LBZ

    LBZ Road Train Member

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    So did you guys go with the MBN or NXS?
     
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