Turtle n Peeps wrote:
Grit dog wrote:
And about 90% of the problems with tuned trucks are guys wringing the guts out of them! The Dmax and Alli 1000 are virtually unchanged mechanicals for 15 years now but somehow it's ok to have a stock 400/800ish truck now but bumping up a truck with 530-650 tq will destroy it?
Say what? Virtually unchanged? Come on, here is a list of the stuff GM did to the engine when they added just 50 HP to the engine. (LLY to LBZ)
GM wrote:
The comprehensive list of changes and upgrades to the 2006 DURAMAX 6600 includes:
* Cylinder block casting and machining changes strengthen the bottom of the cylinder bores to support increased horsepower and torque
* Upgraded main bearing material increases durability
* Revised piston design helps lower compression ratio to 16.8:1 from 17.5:1
* Piston pin bore diameter increased for increased strength
* Connecting rod “ I ” section is thicker for increased strength
* Cylinder heads revised to accommodate lower compression and reduced cylinder firing pressure
* Maximum injection pressure increased from 23,000 psi to more than 26,000 psi
* Fuel delivered via higher-pressure pump, fuel rails, distribution lines and all-new, seven-hole fuel injectors
* Fuel injectors spray directly onto glow plugs, providing faster, better-quality starts and more complete cold-start combustion for reduced emissions
* Improved glow plugs heat up faster through an independent controller
* Revised variable-geometry turbocharger is aerodynamically more efficient to help deliver smooth and immediate response and lower emissions
* Air induction system re-tuned to enhance quietness
* EGR has larger cooler to bring more exhaust into the system
* First application of new, 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency and reduce emissions
For just 50 more HP look what the engineers did to strengthen up the rotating assemble:
Block
Rods
Piston bore
Piston compression
All of this for just 50 HP. To say that this engine is "virtually unchanged" over the years is just not true.
You're correct and I knew someone would find the time to quote all the revisions to the Dmax. There's a list like that too for the Alli over the years.
Guess your idea of major changes and mine differ. Point remains that one is not going to blow up a DA truck in good shape with mild tunes. The Early Dmaxes will support mild to moderate tunes with very good reliability without other supporting mods.
