Jump to content


  • Welcome to BigMackTrucks.com

    Welcome to BigMackTrucks.com, the best resource on the Internet for Antique, Classic and Modern Mack Trucks!  


    Please login or register to take advantage of everything BMT has to offer.  Memberships are Free and offer many benefits:


    • Start new topics and reply to others
    • Subscribe to topics and forums to get automatic updates
    • Showcase your trucks in our Garage
    • Photo Gallery, Member Blogs and much more...
    • Add events to our community calendar
    • Create your own profile and make new friends
    • Customize your experience!
    • Mack Dealer and Corporate personnel can contact the ADMIN after registration for access to the Dealer Forums.

    If you are having trouble logging in or haven't received your validation email, you can post as a guest in the Guest Forum.

    login  register
    Guest Message by DevFuse


    2000 E7-300 uprate options

    • Please log in to reply
    3 replies to this topic

    #1 OFFLINE   convoyduel


      BMT Veteran VIP

    • Big Dog
    • PipPipPipPipPipPipPipPip
    • 216 posts
    • Location:St. Louis, MO
    • Make:Mack
    • Model:RS712LST
    • Year:1977

    Posted 20 February 2012 - 09:04 PM

    I was wondering what VMAC-based options are available for a 2000 E7 300hp to uprate the hp? I was just curious if there's any way to have a dealer change the program on the ECM to uprate the hp. It's in my '00 CH612 Postal Puppy with the Allison behind it.

    Attached Files

    #2 OFFLINE   Mackpro68


      BMT Certified Know-It-All!

    • Pedigreed Bulldog
    • PipPipPipPipPipPipPipPipPipPip
    • 1,278 posts
    • Location:Western Kentucky

    Posted 20 February 2012 - 11:07 PM

    We bought 3 or 4 CH612's about the same year as yours, all had the EM7 300 ETECH engine, Some of the customers/buyers wanted the HP bumped up. As it turned out these enines had the offset camshaft key ways "advanced" . To go any higher with the HP we would have to pull cam and either put a straight key way in for 350 or 400 HP or flip the key way around "retarded" and go for the 427 or 460 HP. Plus turbo and or injectors would have to be replaced depending on desired HP. Customer ended up keepin them the way they were. A Mack dealer can request a HP conversion to see what parts to change and download cost. Its free to ask.

    #3 OFFLINE   convoyduel


      BMT Veteran VIP

    • Big Dog
    • PipPipPipPipPipPipPipPip
    • 216 posts
    • Location:St. Louis, MO
    • Make:Mack
    • Model:RS712LST
    • Year:1977

    Posted 21 February 2012 - 08:06 AM

    It's an excellent truck as-is, I was just wondering if there was a simple way to increase hp. It really does just fine as-is for local work and its fuel efficient as can be. I probably should leave well-enough alone.

    #4 OFFLINE   mackncheese


      Truck Nut

    • Puppy Poster
    • PipPipPipPipPipPip
    • 36 posts
    • Location:Virginia
    • Make:Mack
    • Model:RD690s
    • Year:1999

    Posted 22 February 2012 - 09:29 PM

    I just bought a 1999 RD690S with an EM7 300 ETECH. I gave the VIN number to the dealer and he sent it off to the factory and they told him that to get 400 hp I would have to change the injectors and the turbo and update the computer. To put in 6 Mack Reman Injectors, a mack reman turbo, reprogram the computer, and resticker the engine would be 3650. It is in the shop getting it done now. The service manager said that many have uprated the EM7 ETECH to 400 and it did not overstress the engine. I think mine is a VMAC lll.

    Edited by mackncheese, 23 February 2012 - 08:33 AM.

    0 user(s) are reading this topic

    0 members, 0 guests, 0 anonymous users