The most versatile car is a Mack truck?

In reply to A 401 CJ :

Thanks for that explanation! Okay so when they use the same engine in a med duty truck are you saying they detune it for longevity?

In reply to P3PPY :

Usually yes. Ford 7.3 (gasoline) V8 is another great example, they make 430ish hp and 475 ft lbs in a light duty pickup. Medium duty applications with essentially the same hardware but only put out around 335 hp, I believe also with a much lower rev limit. In medium duty trucks, they're expecting that any time you're accelerating, you're at or near WOT, and the drivetrain is expected to perform that duty for far longer than the average passenger car. Cummins 6.7 example, in Rams they make over 400 hp but the medium duty version of the engine is generally around a 260 hp rating. Significantly different hardware between those versions though.

Notable exception I'll toss out since I happen to like the engine - the GM 8.1 uses the same calibration in Silverados and Suburbans that it used in medium duty applications.

In reply to gearheadE30 :

I believe Ford supplied the fuel system and calibration for the Powerstroke 7.3 and 6.0 while International/Navistar did the fuel system for the T444 and VT365. I think Cummins supplied(s) the engine and fuel system for the Dodge trucks. 

If you want an update on the truck from when we last covered it, it ran at mostly ovals last year, as a new series emerged to give these trucks a place to race.