2oldman wrote:
Earlier RAM trucks were about the loudest thing on the road, followed by the Ford PSDs. Much better now. My 2008 Cummins 8.3 purrs rather nicely, to my ears.
GordonThree wrote:
Why is that? Are most diesel owners modifying their trucks for more "performance" and removing sound/emission control equipment?
They better not be!!
MANY diesel owners DO remove sound AND emission equipment..
I see AND HEAR that pretty much on a daily basis, my house is only 40ft from the road, well insulated, double pane windows and yet have MANY PICKUP TRUCKS fly by making MORE NOISE AND BLACK SMOKE than the 18 wheelers that drive the same road by my house.
In the summer it gets so bad on the weekends I can't even sit out on my front porch :M
Have you ever wondered about the diesels leaving the big black clouds of smoke when accelerating? Yep, those owners HAVE indeed not only removed emission equipment but HAVE also added a "programmer" which tricks the computer into thinking the emissions stuff is present AND dumps tons of fuel into the cylinders to create that lovely choking black cloud..
Its called "rolling coal".. Look it up and read about it.
Sadly, those folks have done this to satisfy their ego's, giving diesels yet another "black eye"..
Back to the OPs question.. YES, there have been "advances" in making diesel engines being quiet from the factory.. So unmodified new diesels when compared to unmodified older diesels will be much quieter at idle and even at speed.
Does it stay that way? Typically it does, however sometimes a manufacturer may need to apply a TSB and reflash the computer with an update that CAN affect injectors timing resulting in more noise..