Thor Forums

[Beau388]

Originally Posted by Chance

It’s interesting that even in pickup tune, the 2021 Ford F-150’s 5.0L V8 can make more power at same RPM than the Ford 6.8L V10 in Class Cs and Axis/Vegas. Granted, power ratings may be on different basis.

5.0L V8 = 410 lb-ft at 4,250 RPM = 332 HP.

That beats the V10’s maximum of 305 HP at same 4,250 RPM.

The V10 only produces 377 lb-ft at 4,250 RPM.

If Ford upgraded 5.0L V8 to iron block for durability, I could see it making a nice fuel efficient option for lighter E-350 motorhomes; provided it fits under doghouse.

Class 5 and 6 trucks have to meet a different fuel standard the light trucks class 1. 2020 standards are 4.6464 gallons of fuel/100bhp-hour. Revving the 7.3 V-8 over 3,900 rpm and the engine cannot meet the the fuel consumption standards so there is a sharp cutoff in fuel and spark to limit the power produced. Class 1-3 trucks do not face the same restrictions. The 7.3 V-8s are all the same except for the computers. The V-10 faced the same fuel restriction in 2016 of 4.93 gallons/100bph-h and thus were limited to 3,900 rpm also to meet the standard. Attached is a 5 Star 2020 Thor Hurricane chassis dyno test with their tune as opposed to the stock tune. The sharp drop off @ 4,700 rpm is due to the fuel injectors duty cycle limitations. Larger injectors would extend the HP and tongue curves to the 5,200 rpm the engine's red line.