2015 F-450 - 19.5 Factory Wheels/Tires

I was just reading that the F 450 and 550 6.7L Scorpion engines have an issue with burning up exhaust valves. The report said the problem is thought to be that the 450 and 550 models do not have a pressure waste dump on their turbochargers like the 250 and 350 trucks do.

Anybody else heard anything about this issue.

NRALIFR wrote:
Well, one way for sure the engine calibration has to be changed for the F450's is the max speed. 19.5" tires usually have speed ratings in the 70-85 mph range. The OEM Continentals on mine have an "N" speed rating which is supposed to be 87 mph. The ECM limits the trucks top speed to 85. There are probably other parameters that are changed as well to enable the truck to tow and haul at max capacity without melting down.

:):)

One of the reasons why they stopped using 19.5's on the F450 pick up. I hope they make the 6.2 or even better yet the V10 available other than just the Diesel.

Well that's great they they are returning the F450 to it's former glory. :)

I hope they use the commercial straight-rail frame and S-series rear axle, like they used to. The commercial frame, axle/brakes/tires and springs are good for GVWR's in the 15,000-17,000 lb range and RGAWR's of 11,000-12,000 lbs.

Be nice if they use the 60" cab to axle length too, which moves the axle 4 inches further to the rear. Good for hauling very long campers, like the old F350 Super Camper Special, from the 70's.

If they use the F450/550 cab/chassis engine tune, it will be less power output, but be able to sustain that power output reliably, under much harder use than the pickup engines can, due to the pickups' overinflated power tunes, for king-of-the-hill marketing purposes.

Commercial truck buyers are not so concerned with max horsepower as we are with long term reliability and heavy payload capacity.

Now if they'd just give the option of an 8.3 ISC Cummins and a Road Ranger transmission....

Well, one way for sure the engine calibration has to be changed for the F450's is the max speed. 19.5" tires usually have speed ratings in the 70-85 mph range. The OEM Continentals on mine have an "N" speed rating which is supposed to be 87 mph. The ECM limits the trucks top speed to 85. There are probably other parameters that are changed as well to enable the truck to tow and haul at max capacity without melting down.

:):)

It'll probably weigh 600lbs more than the outgoing F-450 so it better have at least 15,000lbs GVWR in my opinion.

Ford also claims an F-450 specific engine calibration. I hope this does not mean less power than the rest of the pickups.

NRALIFR wrote:
I heard that too. Sounds like they're taking it back to they way they were built in 2008-2010 model years. The all had 19.5's, a massive rear-end, excellent turning radius, and decent weight ratings especially for towing. The only complaints I have about mine is that it doesn't get on the overload springs soon enough, and the mileage isn't great.

:):)

This is how I've read it too. Just look for what the GVW increases to.

I heard that too. Sounds like they're taking it back to they way they were built in 2008-2010 model years. The all had 19.5's, a massive rear-end, excellent turning radius, and decent weight ratings especially for towing. The only complaints I have about mine is that it doesn't get on the overload springs soon enough, and the mileage isn't great.

:):)