New RAM HD 1000 lb-ft

ShinerBock wrote:
Nope, I worked at Cummins and can honestly tell you that while reliability is high on the list, it is not the most important thing, passing emissions is. In fact, reliability is even decreased in the way of EGR's, unproven fuel pumps, and less reliable VGT for the sole purpose of meeting emissions.

The OE's have to pass a dyno certification in order to sell their engines so they have to tune it to pass these tests as well as providing a safe generic fuel mapping for many users in many applications and many scenarios. The aftermarket does not have to pass a dyno certification. Well..... they have to, but most don't

Not sure why you brought up emissions - of course it trumps durability because not passing emissions means you don't sell engines period! I assumed that was a given.

In this context, tell me how: a new graphite block, stronger pistons / rods, better flowing head, and turbo geometry is emissions driven. The CP4 pump, sure, mostly emissions. But I simply pointed out how far Cummins went just to improve a relatively minor performance gain.

Also, Cummins does add power to many of their engines via tuning without changing any of the hard parts all the time. They did it with the 6.7L, ISX, ISL, and many other engines. In fact, they even offer different power ratings on the same engine and you have to pay higher cost for the added power depending on how the truck is used. Almost all of the diesel manufacturers do this in the medium and heavy duty industry. Heck, my customers used to be able to pay a nominal fee for the licence from CAT to have their engines turned up by one of my 120 dealers. All that was involved was loading a tune that came from CAT.

This ONLY happens on low tune engines neutered on purpose for fleet purposes. If you had a 425 hp ISX, then sure, you can go to a dealer and get it re-rated for say 475 hp. But in most cases you won't have a 600hp rating available without at least injector changes.

We're talking about an engine tune that's already maxed out. An ISB at 385 hp have nothing left to "tune", without hurting durability. Out in the commercial world, I've never seen one at 385 hp, even at RV and fire apparatus duty cycle.