housecrusher Posted April 22, 2009 Share Posted April 22, 2009 i have two cv713 with 400s and they are powerless gutless trucks there used for rolloffs so there not pulling much weight the only thing fast on these trucks are the paint thats peeling on there roofs my dad has always was pro macks but after these two i had engough of them any thing out there that i can do to crank up the power Quote Link to comment Share on other sites More sharing options...
bts-4120 Posted April 22, 2009 Share Posted April 22, 2009 I am assuming you have E7'S motor should uprate to 427 or 460 hi performace injectors can add 20-30% at around $90 a hole Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 22, 2009 Share Posted April 22, 2009 You can take it to a Mack dealer and thay can call Mack and have a "throttle responce file " turned on and reflash and download both ECM's. We do it all the time, helps out with the "deadspots" between shift. We only charge about an hour and a half labor and no parts for this. Quote Link to comment Share on other sites More sharing options...
housecrusher Posted April 23, 2009 Author Share Posted April 23, 2009 they 2004s how do i tell if they are e7s and its been to mack about five times for the lack of power they say its at its max for the specs that mack has Quote Link to comment Share on other sites More sharing options...
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