[Vwdiesel] VW diesel exaust sound

[mikitka]

 Toensing wrote:

I have had no experience running a VW diesel with a straight pipe. However,
I did own an Argosy 26 foot motor home that I wished I had never sold. A
prior owner had replaced the stock Chevy 454 gas engine with an Isuzu 6
cylinder industrial turbo-diesel. It had a streightpipe with no muffler. I
was told the turbo quieted the engine enough to make it legal. It was
coupled to a GM Turbo 400 automatic & a Gearvendor under/over drive. I got
anywhere's from 12 MPG to 17 MPG & usually 15 MPG. I currently own a
Rockwood diesel pusher with a Spartan chasses & 190 Cummings turbodiesel.It
only gets from 9 &  one half to 10 MPG. I think it needs a new thermostat as
it only runs around 140 degrees F under normal conditions & suspect this
contributes to poor MPG. I wonder if removing the muffler would help fuel
economy? However, this is a heavy rig weighing about 20,000 pounds.
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It has been my experience from reading on the GTD forum and researching
diesels that if it is a turbo, opening up the exhaust is the best thing you
can do. The engine gets it's back pressure preturbo so anything open after
the turbo is gravy, allowing the turbo to spool up faster, keeping EGT's
down as well. So you get better throttle response, cooler running temps
EGT's and even better fuel economy.
Nick
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