Josh gall Posted August 12, 2016 Share Posted August 12, 2016 Have a 2007 mack mr688s does not want to pull at anything less than 1200 rpm think it has 400 hp motor just doesn't seem to run very strong drove a 1994 with 350 hp motor for many years before the 2007 it ran way better anything I ca do Quote Link to comment https://www.bigmacktrucks.com/topic/46431-2007-mack-low-power/ Share on other sites More sharing options...
j_martell Posted August 13, 2016 Share Posted August 13, 2016 What motor is in the MR? 1200-1900rpm is the sweet spot on the MP7 in my GU. It'll pull from 1000rpm, but hates it, and is lazy as hell until 1200, then it wakes up 1 Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/46431-2007-mack-low-power/#findComment-342173 Share on other sites More sharing options...
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