Keffer inc Posted March 13, 2016 Share Posted March 13, 2016 I'm looking at newer trucks on line, I wanted a 505 HP truck, but I see another truck that has 485 HP. Its only a 20 HP difference, but I was wondering if the difference is only in the computer and could be flashed to a 505 HP? Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/ Share on other sites More sharing options...
Kansas farmer Posted March 15, 2016 Share Posted March 15, 2016 I think that's the only difference. Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/#findComment-327533 Share on other sites More sharing options...
1965 Posted March 15, 2016 Share Posted March 15, 2016 What I was told; 08 thru 10 were 485; when they changed to new scr engines they bumped hp to 505; don't think you can make a 485 to a 505 because of model yr also if your dealer charges what mine wanted too; for changing 425 to 485; you'll find another truck spec 'ed the way you want it Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/#findComment-327540 Share on other sites More sharing options...
Keffer inc Posted March 17, 2016 Author Share Posted March 17, 2016 Oh ok. I never paid attention to the year difference. Also, which ones are better, the 08-11 or newer ones with DEF fluid? Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/#findComment-327695 Share on other sites More sharing options...
1965 Posted March 17, 2016 Share Posted March 17, 2016 7 hours ago, Keffer inc said: Oh ok. I never paid attention to the year difference. Also, which ones are better, the 08-11 or newer ones with DEF fluid? That's a hard question to answer; I guess 12 & up; they have just the nozzle for 7th injector; (newer style) But they have injector problems; even though they have the stainless steel injector cups 08-09 had problems with injector cup issues (copper); then they went to stainless steel; also the seats are different where injector seats; not interchangable real good long test drives are important; if injector is acting up it will have hesitate in throttle; or stumble up around 1400 rpm; should be a good smooth even pedal all through rpm; I've learned the hard way; I would also figure on pulling dpf & cleaning Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/#findComment-327702 Share on other sites More sharing options...
TRH Posted March 24, 2016 Share Posted March 24, 2016 They also develop as a vibration, or hard start from combustion gas in the fuel system. The SCR units (US10) are a bit more reliable in my experience due to reduced egr flow and less strain. You'd have to contact Mack about a horsepower change on the newer MP8s. As I understand, it is a very significant process in most cases and I've yet to hear of someone doing it - the cost was prohibitive. Consider the gearing if you opt for a 485 for your application. It may be easier to change final drive ratios or transmission to get what you want. Not a lot of info to go off bud. Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/44325-mp8-horsepower-ratings/#findComment-328330 Share on other sites More sharing options...
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