[Vwdiesel] Muffler or Streight pipe

[Tad]

Gerry - definitely go for the chip (Aligator or Rocketchip do good work).
 Turbodiesels respond to chipping better than just about any other vehicle.
 The chip would give you a good bump, and in combination with some
higher-volume nozzles you would be amazed.  Search for Bozio, an Italian
company.

On Wed, Dec 9, 2009 at 8:54 PM, Gerry Wolfe <GerryWolfe at shaw.ca> wrote:

> '97 A3 Jetta TDI... recently replaced the entire exhaust (cat & muffler)
> with 2.5" exhaust, turbo back with a low-restriction muffler and no cat.
> Replaced the air filter with a K&N at the same time.
> I saw no noticeable difference in noise, nor mileage or power.
>
> I am considering chipping.  Maybe these mods would only be noticed on a
> chipped TDI.
>
> Rgds, g.
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of LBaird119 at aol.com
> Sent: December 9, 2009 8:29 PM
> To: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] Muffler or Streight pipe
>
> In a message dated 12/9/2009 3:06:17 PM Pacific Standard Time,
> toensing at wildblue.net writes:
>
> > 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.
>
>  A gas engine needs backpressure to keep the air fuel mix in the
> cylinder during valve overlap.  A diesel has no mixture so a little
> leakage on overlap will do very little other than slightly less O2
> but also less, leftover exhaust in the chamber.
>  With the turbo, a 2.5" exhaust will do wonders.  It varies how much
> it will do "out of the box" though.  Sometimes it wakes it right up,
> other times you really have to take advantage of the much cooler
> EGT's and crank up the fueling.  Bringing the EGT back up will add a
> noticeable amount of power and either maintain the MPG or improve
> it a couple.
>  As I understand it, the exhaust ends up pretty quiet, until you romp
> on it.  Not bad but most likely louder than I'd like.  I lean toward a
> low restriction muffler that'll quiet it down.
>   Yeah Tad, I put a flowmaster on the 4KQ.  Sounded kinda nice
> but a tad loud when you got on it, otherwise it was kinda hollow
> and raspy sounding.  They sound better on a V-8!
>     Loren
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