[Vwdiesel] exhaust systems

Mon Jan 16 09:15:13 PST 2012

When I installed my most recent mTDI AHU into a vanagon I initially used a
22" 2.5" straight through Magnaflow muffler.  The rest of the exhaust was
all 2.5" from the turbo (m-vnt15) back and consisted of a 90° mandrel bend
and about 10 more inches of tailpipe that ended in another small bend at
the end.  I recently replaced the 22" Magnaflow with just straight pipe
(used the muffler on another 1.6td vanagon conversion) and the sound
difference between muffler and straight pipe was minimal.  I will be adding
a universal 16" diesel cat shortly as I have heard they do a very good job
of muffling and with just the straight pipe it is a bit droning.  Reducing
emissions is a bonus.  The engine burns clean enough that clogging the cat
shouldn't be an issue.

On Mon, Jan 16, 2012 at 9:54 AM, Bryan Belman <dieselwesty at yahoo.com> wrote:

> Stop, that is silly talk.  Our diesels don't get hot enough for proper
> cooking temps.
> And the black sooty aftertaste, emm emm.
>
>
> Bryan Belman, Pt. Pleasant, NJ
> 04 Jetta Wagon TDI PD, 100hp, 5sp -- running :<)
> 92 Jetta 1.6 Eco-Turbo Diesel, 5sp -- running :<)
> 82 Diesel Westy 1.9NA -- running :<)
> 70 Type 1 stock Elm Green Beetle -- Under Restoration :-)
>
> From: Dave Cook <davevw at yahoo.com>
> To: VW Diesel Group <vwdiesel at vwfans.com>
> Sent: Monday, January 16, 2012 11:49 AM
> Subject: Re: [Vwdiesel] exhaust systems
>
> Dad's old Passat (which is leaving this afternoon!) had the exhaust
> replaced with a bit larger pipe a couple years before it was wrecked.
> Sounded almost exactly the same.
>
> I think when i get the motor installed in the bus, I am just going to
> drive it to a muffler shop and have a pipe bent straight down and back from
> the turbo.  I might try to have them shape the bend such that I can set
> foil-wrapped food on it to cook a meal as I drive!  That or I'll weld a
> little platform on top of the pipe.  (I did that once on the way to a
> campout-wrapped pork chops, potatoes and carrots in 3 layers of heavy duty
> foil and wired it to the muffler.  Turned out awesome, the chops were
> fork-tender and the potatoes were cooked.)
>
>
> Dave Cook
>
>
> ________________________________
> From: Bryan Belman <dieselwesty at yahoo.com>
> To: "LBaird119 at aol.com" <LBaird119 at aol.com>; "vwdiesel at vwfans.com" <
> vwdiesel at vwfans.com>
> Sent: Monday, January 16, 2012 10:25 AM
> Subject: Re: [Vwdiesel] exhaust systems
>
> I just had a 2" exhaust fabricated from front to back.  had them ream out
> the dump bucket bracket and weld to that, then bend 2" pipe to go all the
> way back.
> cost me $100 more then I was figured and I could have gotten the
> techtonics 2" exhaust system for about the same money but would have had to
> install myself and tough with NO lift.
> I did a timing belt swap and lots of pre winter maintainance just before
> having the exhaust replaced.
> I have not felt a difference but when I went to start the car the day
> after doing the time belt change I looked at the advance cable and "son of
> a gun" it was 1/2 way out, so I know my timing is off, I set the timing
> without FIRST making sure the cable was pushed all the way in.  ARG.
>
> So, I am hoping after finding time to reset the timing this week that I
> will feel more value to the power of the engine after getting the new
> strait pipe installed.
> the sound is great, no need for a muffler at all.
>
>
>
> Bryan Belman, Pt. Pleasant, NJ
> 04 Jetta Wagon TDI PD, 100hp, 5sp -- running :<)
> 92 Jetta 1.6 Eco-Turbo Diesel, 5sp -- running :<)
> 82 Diesel Westy 1.9NA -- running :<)
> 70 Type 1 stock Elm Green Beetle -- Under Restoration :-)
>
> From: "LBaird119 at aol.com" <LBaird119 at aol.com>
> To: vwdiesel at vwfans.com
> Sent: Monday, January 16, 2012 2:57 AM
> Subject: Re: [Vwdiesel] exhaust systems
>
>
> In a message dated 1/15/2012 6:52:17 P.M. Pacific Standard Time,
> pila47 at yahoo.com writes:
>
> I  was underwhelmed w the performance difference and wondered
> about all the  positive info I had read on "uncorking" the
> exhaust on these little  diesels.
> Just recently I had occasion to put in a new timing  belt and
> water pump.  After I had set the timing and went for a  drive
> the difference I felt was enormous.  It was like a whole  new
> engine in there!  I can only surmise that the timing was off
> a  bit, perhaps due to a stretched belt?  Having never set the
> timing  before on this engine I can't really say. But I am way
> pleased w how the  truck now performs and sounds.  It was a bit
> pricey but I'm now a big  fan of techtonics exhaust systems.
> One last note is that the 2"  exhaust actually measures one
> and 7/8" I.D.
>
>
>
> Difference on a TD can be huge.  On my 1.5 Rabbit, 2" back  really opened
> the top end and extended the torque curve but not much otherwise, maybe  a
> little mpg.  2 1/4 on the 1.6 pickup did nothing through most of the  range
> but
> bottom end was unstallable!  Didn't gain any mpg as I recall.  Jake had a
> 2"
> Techtonics on his 1.6 TD Rabbit and I finally convinced him it needed
> 2.5".
> He welded up a 2.5" mandrel bent system and was hugely impressed with
> the improvement.  He'd been previously impressed with what the 2"  system
> did for him.  His 2.5 went from the turbo rather than just the
> spring-clamp
> donut as the 2" did.
> When we put the TD in the pickup, it  never got anything but 2.5 from the
> turbo back so I couldn't compare.
>   Loren
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