[Vwdiesel] Muffler or Streight pipe

[Rudy Petersen]

On my 84 Jetta Turbo Diesel I put a Techtonics Tuning 2.25" system on it.
It had a small Resonator up front like stock and no Muffler.  It was
pleasant, had a little drone at certain speeds but sounded good and was
pretty quiet.
Rudy

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of William J Toensing
Sent: Wednesday, December 09, 2009 3:23 PM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] Muffler or Streight pipe

Here is something that might make for an interesting discussion. I used to
own an Argosy (Airstream)motorhome that the previous owner had installed an
Isuzu 6 cylinder industrial turbodiesel. The engine had no muffler, only a
straight pipe. I was told that the turbo reduced the noise level enough to
be legal & with no muffler, would get better MPG. I wished I had kept it as
at times, it got 17 MPG! This on a 26 foot motorhome on a 1&1/2 ton Chevy
chassis with a THM 400 Hydromatic plus a Gear Vendors  gear spliter. But my
wife didn't like the noise.
Become of my prior experience with the Argosy, I wonder if replacing the
muffler with a straight pipe on VW & Mercedes turbodiesels would
significantly improve MPG? Also, does the turbo quiet the engine enough to
be legal? I suspect someone out there has experimented with this. I also
know that some engines have tuned exhausts & that decreased or increased
back pressure could decrease MPG. The Panhard PL-17 was one such car.
Bill Toensing, Nevada City, CA.
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