Originally Posted by Fast355

They certainly do have broader torque curve as they rightly should. They have better flowing heads, better intake, and a cam phaser that advances the cam at lower engine speeds and allows it to retard at higher engine speeds.

When I had my Nissan Titans I was amazed how much the phasing of the intake camshafts alone affected the powerband of the engine. The cam phaser moved the intake cams only, 30* advanced from the fully retarded 124* ICL to 94* ICL at lower engine speeds. There was a whole table in the PCM that controlled the phasing with RPM and Load. At part-throttle cruising speeds I found that retarding the intake cam considerably under light loads really helped the MPG. As soon as the throttle was tipped into I found it very helpful to advance the cam to create more torque.

Originally Posted by TXsilverado

is it me, or do the newer 5.3 motors seem to have a broader torque curve than the earlier models ? i havent paid attention in a while.