Keith Browning Posted November 3, 2010 Share Posted November 3, 2010 I know we probably discussed this with prior year models but does anyone know definitively why the F-450/500 diesels are depowered? Quote Link to comment Share on other sites More sharing options...
cbriggs Posted November 4, 2010 Share Posted November 4, 2010 The answer we basicly got at 6.7 training last week was durability / longevity. They bank on these going alot of miles at high load. Quote Link to comment Share on other sites More sharing options...
joshbuys Posted November 4, 2010 Share Posted November 4, 2010 I've heard it has to do with the different emissions standards from light duty to medium duty trucks....But I can't say that I know...definitively.... Quote Link to comment Share on other sites More sharing options...
rlchv70 Posted November 4, 2010 Share Posted November 4, 2010 From another forum: FYI: The question..... "I noticed in e-source that the chassis cab 6.7 engine shows 300 hp @2800 and 660 torque @1600...while it is 390 hp and 735 on the pickups through the F450. Is this correct? Is there any speed restriction on the Chassis cabs? What is it ....... And, if the answer is yes...can I get an explanation that I can easily explain to a customer of mine." The answer...... Yes it is correct - When Ford certifies with the EPA they do so in two different ways, one is called a chassis cert, (for pickups) and the other is a dyno cert, (for chassis cabs). The chassis cert is used on the pickups - not to get technical but the simple explanation is for a pickup the chassis configuration is a constant, that is to say we know that every one off the line has a pick up box on the back and that allows engineering to go to the max if you will with the emissions, they are working with a fixed frontal area, height, size, weight ect... while on the dyno cert which is used on the chassis cabs, engineering has no idea what the back end of any given vehicle is, so in turn the engine is certified to allow for the worst case application and still meet the emissions. Now as to the max speed rating for either vehicle pickup or chassis cab, the single factor that determines the max vehicle speed is the tire. In the case of a F-550 the tires are speed rated by the tire manufactures to a maximum of 75mph, so Ford electronically caps the max vehicle speed at 75. So you can blame it on the tire manufacturer..... Ford had received complaints from customers (mostly on F-450 pickups) because the "dang truck wont go over 75mph" so you will notice this year that the F-450 pickup has smaller tires that do a couple of things, one they reduce the total payload capacity, but to the customer more importantly the tires have a higher speed rating that I believe takes the max vehicle speed up to 85mph. Hope this helps... Todd Kaufman FUN WITH TRUCKS! F-Super Duty Chassis Cab Marketing Manager Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 4, 2010 Author Share Posted November 4, 2010 Trhank you Rich, I think I have seen this posted elsewhere too now that I think of it. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted November 6, 2010 Share Posted November 6, 2010 Rich has given some valuable input that opens up a lot more discussion... especially in consideration of the thread on TPMS.... and even more discussion when we consider truck classification vs horsepressure. Food for thought.... here in God's country, let us say thatyou have a SRW F350.... Let us say that you use this F350 for only personal use.... Let us say that you also have an acreage and haul water for your cistern.. Just for the sake of argument, let's opine that you have found a 500 gallon water tank that fits in your pick up bed. That makes for about 400 pounds of water tank... and about 5000 pounds of water. As a commercial vehicle, the SRW F350 cannot haul a 5400 pound "in the box" payload legally. A personal use F350 can haul as much as he wants - up until it makes him crash into something. Sidebar... Ford (or anyone) "assuming" that the pickup box will not be removed and something else installed in it's place is an absolute idiot. In the grand scheme of things, we have overwhelmed the businessman with laws and conditions (most of them fairly reasonable in consideration of public safety) yet allow private individuals (meaning those not being paid in any traceable manner) to lade their vehicles in an unsafe manner as long as nobody gets hurt.... Look for a tire thread.... Quote Link to comment Share on other sites More sharing options...
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