MightyFruit Trucking Posted February 2, 2014 Share Posted February 2, 2014 Ordering new Granite GU713 6 axel Tuesday and just wanted to know the pros and cons between the Two engines. Fuel, power, speed, weight, cost difference for bigger motor! It's 4th quarter and need to know which way to go! Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/ Share on other sites More sharing options...
41180 Posted February 2, 2014 Share Posted February 2, 2014 i would go with the 505 hp . i bet your fuel mileage would be almost the same as the 445 . the 505 would be the same weight as the 445 . im suorises your going for the maxicruise instead of the maxidyne . i would go with the 505 maxidyne in a dump truck. Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230159 Share on other sites More sharing options...
REEL ADDICTION Posted February 2, 2014 Share Posted February 2, 2014 I dont think you have to go with the 505 if u are going with an allison I have the 445 and its fine Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230161 Share on other sites More sharing options...
RowdyRebel Posted February 2, 2014 Share Posted February 2, 2014 Yup. If I had to spend money on a new truck, nothing less than the MP8-505M would do. If it were offered to the general public with more power across a wider range of RPM's, I'd recommend that. Everybody always asks "How can I get MORE power?"...nobody EVER comes in here claiming their truck has too much power expressing the need to cut it back. Spec the big HP and wide power band. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230165 Share on other sites More sharing options...
staxx Posted February 2, 2014 Share Posted February 2, 2014 Go with more power , Never had anyone ask me to turn there engine down before. Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230183 Share on other sites More sharing options...
james j neiweem Posted February 3, 2014 Share Posted February 3, 2014 505 maxidyne should be a beast. Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230257 Share on other sites More sharing options...
MackMann85 Posted February 3, 2014 Share Posted February 3, 2014 If you are going Allison I believe the 455M to be your limit...should be stout enough at 1650lb/ft . Although the 445C comes in at 1760lb/ft! The 505M also being 1760 Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230262 Share on other sites More sharing options...
r686st Posted February 3, 2014 Share Posted February 3, 2014 There is no replacement for displacement! Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230264 Share on other sites More sharing options...
MightyFruit Trucking Posted February 3, 2014 Author Share Posted February 3, 2014 Thanks once again for imput! I Think with the Allison Tranny and the 445C like REEL ADDICTION said should be fine! Plus I will probably save in cost of upgrade and in Fuel! Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230267 Share on other sites More sharing options...
rsb502 Posted February 3, 2014 Share Posted February 3, 2014 Fuel cost should go down with more HP and the same displacement if you drive it right. I would go with the 445C just because its cheaper and has the same torque and you can get it with an Allison. If they offered the 505C with an Allison I'd do that, everything is the same on those engines except tuning so its not hard to turn up. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230277 Share on other sites More sharing options...
Mackpro Posted February 3, 2014 Share Posted February 3, 2014 We bump alot of 445's to 505E's. They both have the same torque rating so you can run the smaller trans. We sold alot of road tractors with the 445 and small trans. Mack would turn on the 505E download ( for around $1000) but would not do the 505M or 505C due to the higher ft lb output. We even told them we changed the trans and they still said no. Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230299 Share on other sites More sharing options...
41180 Posted February 3, 2014 Share Posted February 3, 2014 isnt there a new econodyne plus with 505 hp and 1860 torque ? Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230311 Share on other sites More sharing options...
MackMann85 Posted February 4, 2014 Share Posted February 4, 2014 yes but bonus torque only in the upper gears Quote Link to comment https://www.bigmacktrucks.com/topic/34503-granite-mack-mp8-445c-or-mp8-505c/#findComment-230438 Share on other sites More sharing options...
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