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[EA37TS]

Originally Posted by Chance

The V10 in the E-Series is slightly different than the same-displacement V10 in F-53 motorhome chassis, or other applications as well. The E-Series uses 2-valve heads while the F-53 and others use 3-valves per cylinder. Thus it's not just about changing the tune.

It may also be of interest to many here since the 6.8-liter V10 in F-53 chassis is so common, that starting with 2016 chassis it will not only come with higher-capacity 6-speed automatic transmission, but it has been "derated" in power.

It's important to note that the power derating is likely only on paper. The maximum power is now listed at a much lower RPM which is reportedly required to meet new noise standards. At lower RPMs the maximum torque is actually a little higher.

Having researched this issue after buying my class C on the E 450 chassis the reason for the detuning (305 vs 362 HP) is heat displacement and engine bay temperatures. The 362 HP variation produces higher operating and engine bay temperatures than are allowed in the E series chassis. This is primarily due to the configuration and placement of the firewall on the E series.

The Ford factory installed speed limiters are available for installation on both the E 350 and E 450 series chassis as well as the F53 chassis as well as both variations of the V10. The speed limiters are a chassis option normally installed at the request of fleet customers.