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 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 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 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 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 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 Share on other sites More sharing options...
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