Why are F450^ detuned - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 08-08-2013, 07:56 PM Thread Starter
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Why are F450^ detuned

Maybe it's been covered before but I was just wondering why the 450s and 550s have less power than the 250 and 350s? Is it because of the gearing? Just curious




08 F350 crew 4x4
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79 F350 4x4 460ci
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post #2 of 7 Old 08-08-2013, 08:00 PM
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Originally Posted by blk450er View Post
Maybe it's been covered before but I was just wondering why the 450s and 550s have less power than the 250 and 350s? Is it because of the gearing? Just curious
Just taking a shot in the dark here..
But chances are because the 450 and 550s are built to tow higher loads.

Heavier loads in combination with more hp equal sustained EGTs outside of the 'safe' spectrum

Or you could just be feeling the additional weight you are lugging around


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post #3 of 7 Old 08-08-2013, 08:10 PM
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They are detuned to increase reliability since they are presumably going to be used to tow more than the 2 and 350's.
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post #4 of 7 Old 08-08-2013, 08:25 PM Thread Starter
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Gotcha, don't they have 4:30 gears too that prob makes up for it too. So if they are tuned do they get the same 300 hp for example with an H&S?




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

79 F350 4x4 460ci
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post #5 of 7 Old 08-08-2013, 08:32 PM
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Some have 488s, others have 430s. They actually get more than 300 hp increase because they start off weaker.
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post #6 of 7 Old 08-09-2013, 04:00 AM
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I have a 08 f350 regular cab dually and my truck has 4:30's in it, It also has a manual trans.. the 450+ have 4:88's unless they were ordered with 4:30's for highway etc. When im on the highway in 6th gear doing about 68-72 my rpm's are right at my peak torque around 2000-2100 rpm. Lets just say when i have a load on and im going up the hill and this thing spools i dont loose a mph.
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post #7 of 7 Old 08-09-2013, 04:42 AM
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This may fall in line with their International/Navistar counterparts.
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